TEN00695-00

HYDRAULIC PC490LC -11

EXCAVATOR SERIAL NUMBERS 85084 and up

WARNING
Unsafe use of this machine may cause serious injury or
death. Operators and maintenance personnel must read
this manual before operating or maintaining this machine.
This manual should be kept near the machine for
reference and periodically reviewed by all personnel who
will come into contact with it.
NOTICE
Komatsu has Operation & Maintenance Manuals
written in some other languages. If a foreign language
manual is necessary, contact your local distributor for
availability.
FOREWORD

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BEFORE READING THIS MANUAL FOREWORD

BEFORE READING THIS MANUAL

This manual gives details of the operation and methods of inspection and maintenance for this machine that
must be obeyed in order to use the machine safely. Most accidents are caused by the failure to follow funda-
mental safety rules for the operation and maintenance of machines.
Read, understand and follow all precautions and warnings in this manual and on the machine before performing
operation and maintenance. Failure to do so may result in serious injury or death.
Komatsu cannot predict every circumstance that might involve a potential hazard when the machine is used.
Therefore, the safety messages in this manual and on the machine may not include all possible safety precau-
tions.
If you perform any operation, inspection, or maintenance under conditions that are not described in this manual,
understand that it is your responsibility to take the necessary precautions to ensure safety. In no event should
you or others engage in the prohibited uses or actions described in this manual. It is dangerous to perform im-
proper operation and maintenance of the machine. It may cause serious injury or death.
If you sell the machine, be sure to give this manual to the new owner together with the machine.
Always keep this Operation and Maintenance Manual in the indicated location so that all relevant personnel can
read it at any time.
Keep it in the magazine box on the left side of the operator's
seat.

If this manual is lost or damaged, contact Komatsu or your Komatsu distributor and tell them about the machine
model name and the serial No. immediately to arrange for its replacement.
For details regarding the machine model name and the serial No., see the machine serial No. plate. In order to
arrange the proper Operation and Maintenance Manual, you will need to provide the machine model name and
the serial No.
This manual uses the International System of Units (SI) for units of measurement. For reference, units that have
been used in the past are given in { }.
The explanations, values, and illustrations in this manual have been prepared based on the latest information
available as of the date of its publication. Continuing improvements in the design of this machine may lead to
additional changes that are not reflected in this manual. If there is any question or suggestion, consult your Ko-
matsu distributor.
The numbers in the illustrations correspond to the numbers in ( ) in the text. (Example: 1 → (1))
Komatsu delivers machines that comply with all applicable regulations and standards of the country to which it
has been shipped. If this machine has been purchased in another country, it may lack certain safety devices and
specifications that are necessary for use in your country. If there is any question about whether your product
complies with the applicable standards and regulations of your country, consult your Komatsu distributor before
operating the machine.

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FOREWORD SAFETY INFORMATION

SAFETY INFORMATION
To enable you to use the machine safely, and to prevent personal injury to operators, service personnel or by-
standers, the precautions and warnings included in this manual and the safety signs attached to the machine
must always be observed.
To identify important safety messages in the manual and on the machine labels, the following signal words are
used.
The "Safety Alert Symbol" identifies important safety messages on machines, in manuals, and elsewhere. When
you see this symbol, be alert to the risk of personal injury or death. Follow the instructions in the safety mes-
sage.
This signal word indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury.
This signal word indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
This signal word indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injury. It may also be used to alert against unsafe practices that may cause
property damage.

The following signal words are used to alert you to information that must be followed to avoid damage to the
machine.
If precautions described are not observed, the machine may be damaged or the service life may
be reduced.
This word is used for information that is useful to know.

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INTRODUCTION FOREWORD

INTRODUCTION
MAIN USE OF MACHINE
This Komatsu machine is designed to be used mainly for the following work:
• Digging work
• Ditching work
• Loading work
• Leveling work
• Demolition work
For details of work procedure, see MACHINE OPERATIONS AND CONTROLS “RECOMMENDED APPLICA-
TIONS (3-218)”.

DIRECTIONS OF MACHINE

(A) Front (D) Right

(B) Rear (E) Operator's seat
(C) Left (F) Sprocket
In this manual, the terms front, rear, left, and right refer to the travel direction as seen from the operator's seat
when the operator's seat is facing the front and the sprocket is at the rear of the machine.

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FOREWORD INTRODUCTION

VISIBILITY FROM OPERATOR'S SEAT

The visibility of this machine required by visibility standards (ISO 5006) are shown in the drawing below.
Proximity visibility
The figure below shows a visibility from the machine at a spot 1.0 ｍ away from outside the machine and 1.5 ｍ
above the ground.

12 m radius visibility
The figure below shows a visibility from the machine for a radius of 12 m. Shaded area (A) in the figure shows
an area whose view is blocked when the machine is equipped with the mirrors and other visibility assistant devi-
ces. Be fully aware that there is an area where the operator cannot see when operating the machine.

Protective structures
This machine is equipped with a structure to protect the operator (ROPS) conforming to ISO12117-2.

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ENGINE TECHNOLOGY TO CONFORM EXHAUST GAS EMISSION FOREWORD

ENGINE TECHNOLOGY TO CONFORM EXHAUST GAS

EMISSION
About Engine Technology
This engine technology combines a Komatsu Diesel Particulate Filter (KDPF) and Komatsu’s Urea Selective
Catalytic Reduction (SCR) to conform EPA Tier4 Final emission regulation in North America.
• Komatsu Diesel Particulate Filter (KDPF): A device which captures diesel particular matter or soot in the
exhaust gas to purify exhaust gas. If soot is accumulated to a certain level in the filter, a purification process
to burn the soot is performed automatically to keep the filtering performance of KDPF high.
• Komatsu’s Urea SCR system: A device which decomposes the toxic nitrogen oxides (NOx) mixed in the
exhaust gas into harmless nitrogen and water. Spraying the reagent (Diesel Exhaust Fluid) into the exhaust
gas produces a reaction between the nitrogen oxides and ammonia generated from the urea solution and
decomposes the nitrogen oxides into nitrogen and water.
About Diesel Exhaust Fluid (DEF)
Diesel Exhaust Fluid is the aqueous urea solution for the SCR system.
DEF is the abbreviation for Diesel Exhaust Fluid, and is represented as DEF throughout this manual.
DEF is a colorless transparent and aqueous urea solution made with 32.5 % urea (AUS32) and 67.5 % deion-
ized water. Urea as main constituent is a material which is used for cosmetics, medical and pharmaceutical
products, and fertilizer, etc.
Commercial DEF, that is API (American Petroleum Institute) certified and fulfills the quality requirements in ac-
cordance with ISO 22241-1, is to be used. The certified DEF has the API DIESEL EXHAUST FLUID Certifica-
tion Mark shown as follows. Look for the API DEF Certification Mark when purchasing DEF.
API Diesel Exhaust Fluid Certification Mark is the trade mark of
API (American Petroleum Institute).

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FOREWORD PRODUCT INFORMATION

PRODUCT INFORMATION
When requesting service or ordering replacement parts, inform your Komatsu distributor of the following items.

LOCATION OF PRODUCT IDENTIFICATION NUMBER (PIN)/MACHINE SERI-

AL NO. PLATE
It is located on the right bottom of the operator's cab.
The design of the nameplate differs according to the district.

LOCATION OF ENGINE NUMBER PLATE

They are on top of the engine cylinder head cover.

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PRODUCT INFORMATION FOREWORD

SERVICE METER LOCATION

This is displayed on the machine monitor.

YOUR MACHINE SERIAL NUMBERS AND DISTRIBUTOR

Machine serial No.
Engine serial No.
Product identification
number (PIN)
Distributor name
Address
Phone/Fax
Service personnel

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FOREWORD TABLE OF CONTENTS

TABLE OF CONTENTS
FOREWORD.................................................................................................................................................... 1-1
BEFORE READING THIS MANUAL ......................................................................................................... 1-2
SAFETY INFORMATION .......................................................................................................................... 1-3
INTRODUCTION ...................................................................................................................................... 1-4
MAIN USE OF MACHINE .................................................................................................................. 1-4
DIRECTIONS OF MACHINE.............................................................................................................. 1-4
VISIBILITY FROM OPERATOR'S SEAT ............................................................................................ 1-5
ENGINE TECHNOLOGY TO CONFORM EXHAUST GAS EMISSION ..................................................... 1-6
PRODUCT INFORMATION....................................................................................................................... 1-7
LOCATION OF PRODUCT IDENTIFICATION NUMBER (PIN)/MACHINE SERIAL NO. PLATE ........ 1-7
LOCATION OF ENGINE NUMBER PLATE ........................................................................................ 1-7
SERVICE METER LOCATION ........................................................................................................... 1-8
YOUR MACHINE SERIAL NUMBERS AND DISTRIBUTOR.............................................................. 1-8
SAFETY........................................................................................................................................................... 2-1
SAFETY.................................................................................................................................................... 2-2
SAFETY LABELS ..................................................................................................................................... 2-4
LOCATION OF SAFETY LABELS...................................................................................................... 2-5
CONTENTS OF SAFETY LABELS .................................................................................................... 2-7
GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTENANCE .................................... 2-16
PRECAUTIONS BEFORE STARTING OPERATION........................................................................ 2-16
PREPARATIONS FOR SAFE OPERATION ..................................................................................... 2-16
PRECAUTIONS TO PREVENT FIRE............................................................................................... 2-18
PRECAUTIONS WHEN GETTING ON OR OFF MACHINE............................................................. 2-20
DO NOT GET CAUGHT IN WORK EQUIPMENT ............................................................................ 2-21
PRECAUTIONS RELATED TO PROTECTIVE STRUCTURES........................................................ 2-22
PROTECTION AGAINST FALLING, FLYING OR INTRUDING OBJECTS ....................................... 2-22
UNAUTHORIZED MODIFICATION .................................................................................................. 2-23
PRECAUTIONS RELATED TO ATTACHMENTS AND OPTIONS .................................................... 2-23
PRECAUTIONS RELATED TO CAB GLASS ................................................................................... 2-23
PRECAUTIONS WHEN RUNNING ENGINE INSIDE BUILDING ..................................................... 2-23
PRECAUTIONS FOR OPERATION ........................................................................................................ 2-24
PRECAUTIONS FOR JOBSITE ....................................................................................................... 2-24
START ENGINE............................................................................................................................... 2-27
PRECAUTIONS FOR OPERATION ................................................................................................. 2-29
PRECAUTIONS FOR TRANSPORTATION...................................................................................... 2-36
TOWING AND BEING TOWED........................................................................................................ 2-37
LIFTING OPERATION BY USING BUCKET WITH HOOK ............................................................... 2-38
PRECAUTIONS FOR MAINTENANCE ................................................................................................... 2-39
PRECAUTIONS BEFORE STARTING INSPECTION AND MAINTENANCE ................................... 2-39
PRECAUTIONS FOR CHECK AND MAINTENANCE ...................................................................... 2-43
PRECAUTIONS FOR DEF...................................................................................................................... 2-49
GENERAL CHARACTER AND PRECAUTIONS FOR HANDLING .................................................. 2-49
PRECAUTIONS FOR ADDING ........................................................................................................ 2-49
PRECAUTIONS FOR STORING...................................................................................................... 2-49
PRECAUTIONS FOR FIRE HAZARD AND LEAKAGE .................................................................... 2-49
OTHER PRECAUTIONS.................................................................................................................. 2-49
OPERATION .................................................................................................................................................... 3-1
GENERAL VIEW....................................................................................................................................... 3-2
MACHINE EQUIPMENT NAME ......................................................................................................... 3-2
CAB EQUIPMENT NAMES................................................................................................................ 3-4
CONTROLS AND GAUGES NAMES ................................................................................................. 3-5
EXPLANATION OF COMPONENTS ......................................................................................................... 3-9
EXPLANATION OF MACHINE MONITOR EQUIPMENT ................................................................... 3-9
SWITCHES ...................................................................................................................................... 3-96
CONTROL LEVERS AND PEDALS ............................................................................................... 3-105
OTHER EQUIPMENT .................................................................................................................... 3-109

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TABLE OF CONTENTS FOREWORD

MACHINE OPERATIONS AND CONTROLS ........................................................................................ 3-150

CHECKS AND ADJUSTMENT BEFORE STARTING ENGINE ...................................................... 3-150
METHOD FOR STARTING ENGINE.............................................................................................. 3-183
METHOD FOR OPERATIONS AND CHECKS AFTER STARTING ENGINE ................................. 3-187
METHOD FOR STOPPING ENGINE ............................................................................................. 3-198
METHOD FOR STARTING MACHINE (TRAVEL FORWARD AND REVERSE) AND STOPPING MA-
CHINE ........................................................................................................................................ 3-200
METHOD FOR STEERING MACHINE........................................................................................... 3-203
METHOD FOR SWINGING MACHINE .......................................................................................... 3-205
METHOD FOR OPERATING WORK EQUIPMENT ....................................................................... 3-206
HANDLE WORKING MODE .......................................................................................................... 3-208
PROHIBITED OPERATIONS ......................................................................................................... 3-210
PRECAUTIONS FOR OPERATION ............................................................................................... 3-214
PRECAUTIONS FOR WORKING ON SLOPE ............................................................................... 3-216
METHOD FOR ESCAPING FROM MUD ....................................................................................... 3-217
RECOMMENDED APPLICATIONS................................................................................................ 3-218
EFFECTIVE USE OF HYDRAULIC EXCAVATOR.......................................................................... 3-219
METHOD FOR REPLACING AND INVERTING BUCKET.............................................................. 3-220
METHOD FOR PARKING MACHINE ............................................................................................. 3-223
METHOD FOR CHECKING AFTER FINISHING WORK ................................................................ 3-224
LOCK ............................................................................................................................................. 3-225
HANDLE AIR CONDITIONER............................................................................................................... 3-230
EXPLANATION OF AIR CONDITIONER EQUIPMENT.................................................................. 3-231
METHOD FOR OPERATING AIR CONDITIONER......................................................................... 3-236
HANDLING RADIO ............................................................................................................................... 3-244
EXPLANATION OF RADIO EQUIPMENT ...................................................................................... 3-244
METHOD FOR CONTROLLING RADIO ........................................................................................ 3-247
STOW ANTENNA .......................................................................................................................... 3-249
TRANSPORTATION.............................................................................................................................. 3-250
PRECAUTIONS FOR TRANSPORTING MACHINE ...................................................................... 3-250
SELECT TRANSPORTATION METHOD........................................................................................ 3-250
LOADING AND UNLOADING WITH TRAILER .............................................................................. 3-251
METHOD FOR LIFTING MACHINE ............................................................................................... 3-262
SPREAD AND NARROW TRACK FRAME GAUGE....................................................................... 3-264
COLD WEATHER OPERATION............................................................................................................ 3-266
COLD WEATHER OPERATION INFORMATION ........................................................................... 3-266
PRECAUTIONS AFTER DAILY WORK COMPLETION ................................................................. 3-268
AFTER COLD WEATHER SEASON .............................................................................................. 3-268
PRECAUTIONS FOR LONG-TERM STORAGE ................................................................................... 3-269
PREPARATION FOR LONG-TERM STORAGE ............................................................................. 3-269
MAINTENANCE DURING LONG-TERM STORAGE...................................................................... 3-269
STARTING MACHINE AFTER LONG-TERM STORAGE ............................................................... 3-270
TROUBLES AND ACTIONS ................................................................................................................. 3-271
ACTIONS WHEN RUNNING OUT OF FUEL ................................................................................. 3-271
PHENOMENA THAT ARE NOT FAILURES ................................................................................... 3-272
PRECAUTIONS FOR TOWING MACHINE .................................................................................... 3-273
PRECAUTIONS FOR SEVERE JOB CONDITION......................................................................... 3-274
PRECAUTIONS FOR DISCHARGED BATTERY ........................................................................... 3-275
OTHER TROUBLE......................................................................................................................... 3-280
MAINTENANCE............................................................................................................................................... 4-1
PRECAUTIONS FOR MAINTENANCE ..................................................................................................... 4-2
CHECK SERVICE METER READING ............................................................................................... 4-2
KOMATSU GENUINE REPLACEMENT PARTS ................................................................................ 4-2
KOMATSU GENUINE LUBRICANTS ................................................................................................. 4-2
ALWAYS USE CLEAN WASHER FLUID ............................................................................................ 4-2
FRESH AND CLEAN LUBRICANTS .................................................................................................. 4-2
CHECK DRAINED OIL AND USED FILTER....................................................................................... 4-2
PRECAUTIONS FOR REFILLING OIL OR FUEL .............................................................................. 4-2

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FOREWORD TABLE OF CONTENTS

PRECAUTIONS FOR ADDING DEF ................................................................................................. 4-2

PRECAUTIONS FOR WELDING ....................................................................................................... 4-2
DO NOT DROP THINGS INSIDE MACHINE ..................................................................................... 4-2
PRECAUTIONS FOR KDPF .............................................................................................................. 4-2
PRECAUTIONS FOR SCR ASSEMBLY ............................................................................................ 4-3
DUSTY JOBSITES............................................................................................................................. 4-3
AVOID MIXING OIL............................................................................................................................ 4-3
LOCK INSPECTION COVERS .......................................................................................................... 4-3
BLEED AIR FROM HYDRAULIC CIRCUIT ........................................................................................ 4-3
PRECAUTIONS WHEN INSTALLING HYDRAULIC HOSES ............................................................. 4-3
CHECKS AFTER INSPECTION AND MAINTENANCE...................................................................... 4-3
FUEL AND LUBRICANTS TO MATCH THE AMBIENT TEMPERATURE........................................... 4-3
CLOSE ENGINE HOOD SECURELY................................................................................................. 4-4
OUTLINE OF MAINTENANCE.................................................................................................................. 4-5
HANDLE OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC .................................................. 4-5
HANDLE ELECTRICAL COMPONENTS ......................................................................................... 4-10
STANDARD TIGHTENING TORQUE FOR BOLTS AND NUTS ...............................................................4-11
MAINTENANCE SCHEDULE.................................................................................................................. 4-13
MAINTENANCE SCHEDULE TABLE............................................................................................... 4-13
MAINTENANCE INTERVAL FOR HYDRAULIC BREAKER ............................................................. 4-15
MAINTENANCE PROCEDURE .............................................................................................................. 4-16
WHEN REQUIRED .......................................................................................................................... 4-16
CHECKS BEFORE STARTING........................................................................................................ 4-47
EVERY 50 HOURS MAINTENANCE ............................................................................................... 4-48
EVERY 250 HOURS MAINTENANCE ............................................................................................. 4-49
EVERY 500 HOURS MAINTENANCE ............................................................................................. 4-54
EVERY 1000 HOURS MAINTENANCE ........................................................................................... 4-65
EVERY 2000 HOURS MAINTENANCE ........................................................................................... 4-73
EVERY 4000 HOURS MAINTENANCE ........................................................................................... 4-85
EVERY 4500 HOURS MAINTENANCE ........................................................................................... 4-88
EVERY 5000 HOURS MAINTENANCE ........................................................................................... 4-89
EVERY 8000 HOURS MAINTENANCE ........................................................................................... 4-91
EVERY 9000 HOURS MAINTENANCE ........................................................................................... 4-92
SPECIFICATIONS ........................................................................................................................................... 5-1
SPECIFICATIONS .................................................................................................................................... 5-2
SPECIFICATIONS: PC490LC-11 ....................................................................................................... 5-2
ATTACHMENTS AND OPTIONS ..................................................................................................................... 6-1
PRECAUTIONS FOR USING ATTACHMENT AND OPTIONS.................................................................. 6-2
PRECAUTIONS WHEN SELECTING ................................................................................................ 6-2
READ THE OPERATION AND MAINTENANCE MANUAL THOROUGHLY....................................... 6-2
PRECAUTIONS WHEN REMOVING AND INSTALLING ................................................................... 6-2
PRECAUTIONS FOR USING ............................................................................................................ 6-2
HANDLE BUCKET WITH HOOK............................................................................................................... 6-4
PRECAUTIONS FOR OPERATION ................................................................................................... 6-4
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT .................................................... 6-5
EXPLANATION OF COMPONENTS ON MACHINE EQUIPPED WITH ATTACHMENT..................... 6-5
METHOD FOR CHANGE-OVER AND CONNECT HYDRAULIC CIRCUIT FOR MACHINE READY
FOR INSTALLATION OF ATTACHMENT........................................................................................ 6-9
METHOD FOR REMOVING AND INSTALLING ATTACHMENT .......................................................6-11
METHOD FOR OPERATING ATTACHMENT................................................................................... 6-15
LONG-TERM STORAGE ................................................................................................................. 6-19
MAINTENANCE OF ADDITIONAL FILTER FOR BREAKER............................................................ 6-19
SPECIFICATIONS ........................................................................................................................... 6-22
METHOD FOR CHANGING CONTROL PATTERNS .............................................................................. 6-23
CONTROL PATTERNS OTHER THAN STANDARD CONTROL METHOD ..................................... 6-24
ATTACHMENTS AND OPTIONS ............................................................................................................ 6-25
INSTALL ATTACHMENT .................................................................................................................. 6-25
TRACK SHOES SELECTION .......................................................................................................... 6-27

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TABLE OF CONTENTS FOREWORD

RECOMMENDED ATTACHMENT OPERATIONS................................................................................... 6-28

HYDRAULIC BREAKER .................................................................................................................. 6-28
REPLACEMENT PARTS.................................................................................................................................. 7-1
PERIODIC REPLACEMENT OF DEFINED LIFE PARTS.......................................................................... 7-2
DEFINED LIFE PARTS LIST.............................................................................................................. 7-2
CONSUMABLE PARTS ............................................................................................................................ 7-3
CONSUMABLE PARTS ..................................................................................................................... 7-3
RECOMMENDED FUEL, COOLANT, AND LUBRICANT .......................................................................... 7-5
LUBRICATION CHART ...................................................................................................................... 7-6
USE OF FUEL, COOLANT AND LUBRICANTS TO ACCORDING TO AMBIENT TEMPERATURE ........
....................................................................................................................................................... 7-7
RECOMMENDED BRANDS AND QUALITIES OTHER THAN KOMATSU GENUINE OILS .............. 7-8
INDEX.............................................................................................................................................................. 8-1

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 SAFETY

Please read and make sure that you fully understand the precautions descri-
bed in this manual and the safety labels on the machine. When operating or
servicing the machine, always follow these precautions strictly.

2-1
SAFETY SAFETY

SAFETY
SAFETY LABELS ............................................................................................................................................ 2-4
LOCATION OF SAFETY LABELS............................................................................................................. 2-5
CONTENTS OF SAFETY LABELS ........................................................................................................... 2-7
GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTENANCE ........................................... 2-16
PRECAUTIONS BEFORE STARTING OPERATION............................................................................... 2-16
ENSURE SAFE OPERATION .......................................................................................................... 2-16
UNDERSTAND THE MACHINE ....................................................................................................... 2-16
PREPARATIONS FOR SAFE OPERATION ............................................................................................ 2-16
PRECAUTIONS FOR SAFETY-RELATED EQUIPMENT ................................................................. 2-16
INSPECT MACHINE ........................................................................................................................ 2-16
WEAR WELL-FITTING CLOTHES AND PROTECTIVE EQUIPMENT ............................................. 2-16
KEEP MACHINE CLEAN ................................................................................................................. 2-17
PRECAUTIONS FOR INSIDE OPERATOR'S COMPARTMENT ...................................................... 2-17
PROVIDE FIRE EXTINGUISHER AND FIRST AID KIT ................................................................... 2-17
IF ANY PROBLEM IS FOUND ......................................................................................................... 2-17
PRECAUTIONS TO PREVENT FIRE...................................................................................................... 2-18
ACTIONS IF FIRE OCCURS ........................................................................................................... 2-18
PREVENT FIRE............................................................................................................................... 2-18
PRECAUTIONS WHEN GETTING ON OR OFF MACHINE.................................................................... 2-20
USE HANDRAILS AND STEPS WHEN GETTING ON OR OFF MACHINE ..................................... 2-20
NO JUMPING ON OR OFF MACHINE............................................................................................. 2-20
NO PEOPLE ON ATTACHMENTS ................................................................................................... 2-20
PRECAUTIONS WHEN STANDING UP FROM OPERATOR'S SEAT.............................................. 2-21
PRECAUTIONS WHEN LEAVING MACHINE .................................................................................. 2-21
EMERGENCY EXIT FROM OPERATOR'S CAB .............................................................................. 2-21
DO NOT GET CAUGHT IN WORK EQUIPMENT ................................................................................... 2-21
PRECAUTIONS RELATED TO PROTECTIVE STRUCTURES............................................................... 2-22
PROTECTION AGAINST FALLING, FLYING OR INTRUDING OBJECTS .............................................. 2-22
UNAUTHORIZED MODIFICATION ......................................................................................................... 2-23
PRECAUTIONS RELATED TO ATTACHMENTS AND OPTIONS ........................................................... 2-23
PRECAUTIONS RELATED TO CAB GLASS .......................................................................................... 2-23
PRECAUTIONS WHEN RUNNING ENGINE INSIDE BUILDING ............................................................ 2-23
PRECAUTIONS FOR OPERATION ............................................................................................................... 2-24
PRECAUTIONS FOR JOBSITE .............................................................................................................. 2-24
INVESTIGATE AND CONFIRM JOBSITE CONDITIONS................................................................. 2-24
PRECAUTIONS WHEN WORKING ON LOOSE GROUND ............................................................. 2-24
DO NOT GO CLOSE TO HIGH-VOLTAGE CABLES........................................................................ 2-25
ENSURE GOOD VISIBILITY............................................................................................................ 2-25
CHECK SIGNS AND SIGNALMAN'S SIGNALS............................................................................... 2-26
BEWARE OF ASBESTOS DUST ..................................................................................................... 2-26
START ENGINE...................................................................................................................................... 2-27
USE WARNING TAGS ..................................................................................................................... 2-27
CHECKS AND ADJUSTMENT BEFORE STARTING ENGINE ........................................................ 2-27
PRECAUTIONS WHEN STARTING ENGINE .................................................................................. 2-28
IN COLD WEATHER........................................................................................................................ 2-28
START ENGINE WITH JUMPER CABLES ...................................................................................... 2-28
PRECAUTIONS FOR OPERATION ........................................................................................................ 2-29
CHECKS BEFORE OPERATION..................................................................................................... 2-29
PRECAUTIONS WHEN TRAVELING IN FORWARD OR REVERSE AND SWINGING ................... 2-29
PRECAUTIONS WHEN TRAVELING............................................................................................... 2-30
PRECAUTIONS WHEN TRAVELING ON SLOPES ......................................................................... 2-31
PRECAUTIONS WHEN OPERATING ON SLOPES ........................................................................ 2-32
PROHIBITED OPERATIONS ........................................................................................................... 2-32
PRECAUTIONS WHEN OPERATING ON SNOW OR FROZEN SURFACES.................................. 2-34
PRECAUTIONS WHEN PARKING MACHINE ................................................................................. 2-35
PRECAUTIONS FOR TRANSPORTATION............................................................................................. 2-36

2-2
SAFETY SAFETY

PRECAUTIONS WHEN LOADING AND UNLOADING .................................................................... 2-36

TOWING AND BEING TOWED............................................................................................................... 2-37
PRECAUTIONS FOR TOWING AND BEING TOWED..................................................................... 2-37
LIFTING OPERATION BY USING BUCKET WITH HOOK ...................................................................... 2-38
PRECAUTIONS FOR LIFTING OPERATIONS ................................................................................ 2-38
PRECAUTIONS FOR MAINTENANCE .......................................................................................................... 2-39
PRECAUTIONS BEFORE STARTING INSPECTION AND MAINTENANCE .......................................... 2-39
DISPLAY WARNING TAG DURING INSPECTION AND MAINTENANCE ....................................... 2-39
KEEP WORK PLACE CLEAN AND TIDY ........................................................................................ 2-39
SELECT SUITABLE PLACE FOR INSPECTION AND MAINTENANCE .......................................... 2-39
ONLY AUTHORIZED PERSONNEL................................................................................................. 2-39
APPOINT LEADER WHEN WORKING WITH OTHERS .................................................................. 2-39
STOP ENGINE BEFORE CARRYING OUT INSPECTION AND MAINTENANCE ........................... 2-39
TWO WORKERS FOR MAINTENANCE WHEN ENGINE IS RUNNING .......................................... 2-41
PRECAUTIONS WHEN INSTALLING, REMOVING, OR STORING ATTACHMENTS...................... 2-41
PRECAUTIONS FOR WORKING AT HIGH PLACES ...................................................................... 2-41
PRECAUTIONS WHEN WORKING ON MACHINE.......................................................................... 2-42
PRECAUTIONS WHEN WORKING UNDER MACHINE OR WORK EQUIPMENT .......................... 2-42
USE PROPER TOOLS .................................................................................................................... 2-42
PRECAUTIONS FOR CHECK AND MAINTENANCE ............................................................................. 2-43
TURN BATTERY DISCONNECT SWITCH TO OFF POSITION ....................................................... 2-43
PRECAUTIONS FOR WELDING ..................................................................................................... 2-43
HANDLE BATTERY ......................................................................................................................... 2-43
PRECAUTIONS WHEN USING HAMMER ...................................................................................... 2-44
PRECAUTIONS FOR HIGH-TEMPERATURE COOLANT ............................................................... 2-44
PRECAUTIONS FOR HIGH-TEMPERATURE OIL........................................................................... 2-44
PRECAUTIONS FOR HIGH-TEMPERATURE PARTS..................................................................... 2-45
PRECAUTIONS FOR HIGH-PRESSURE OIL.................................................................................. 2-45
PRECAUTIONS FOR HIGH-PRESSURE FUEL .............................................................................. 2-45
HANDLE HIGH-PRESSURE HOSES AND PIPING ......................................................................... 2-45
PRECAUTIONS FOR HIGH VOLTAGE............................................................................................ 2-46
PRECAUTIONS FOR NOISE........................................................................................................... 2-46
PRECAUTIONS FOR HIGH-PRESSURE GREASE WHEN ADJUSTING TRACK TENSION .......... 2-46
DO NOT DISASSEMBLE RECOIL SPRING .................................................................................... 2-46
HANDLE ACCUMULATOR AND GAS SPRING ............................................................................... 2-47
PRECAUTIONS FOR COMPRESSED AIR...................................................................................... 2-47
MAINTENANCE OF AIR CONDITIONER ........................................................................................ 2-47
PRECAUTIONS FOR DISPOSING OF WASTE MATERIALS .......................................................... 2-47
METHOD FOR SELECTING WINDOW WASHER FLUID................................................................ 2-47
PERIODIC REPLACEMENT OF DEFINED LIFE PARTS................................................................. 2-48
PRECAUTIONS FOR DEF............................................................................................................................. 2-49
GENERAL CHARACTER AND PRECAUTIONS FOR HANDLING ......................................................... 2-49
PRECAUTIONS FOR ADDING ............................................................................................................... 2-49
PRECAUTIONS FOR STORING............................................................................................................. 2-49
PRECAUTIONS FOR FIRE HAZARD AND LEAKAGE ........................................................................... 2-49
OTHER PRECAUTIONS......................................................................................................................... 2-49

2-3
SAFETY LABELS SAFETY

SAFETY LABELS
k WARNING
Be sure that you fully understand the correct position, content and how to avoid a danger shown in the
safety labels.

Handle the warning signs and safety labels used on this machine as follows.
• Always keep the safety labels clean so that you can read it properly. When cleaning the safety labels, do
not use organic solvents or gasoline. These may cause the labels to peel off.
• If the safety labels are damaged, lost, or cannot be read properly, replace them with new ones. For details
of the part numbers for the safety labels, see this manual or the actual label, and place an order to your
Komatsu distributor.
• There are also other labels in addition to the warning signs and safety labels. Handle those labels in the
same way.

2-4
SAFETY SAFETY LABELS

LOCATION OF SAFETY LABELS

2-5
SAFETY LABELS SAFETY

1. Caution for operation, inspection and maintenance 16. Caution when swinging and traveling in reverse
2. Caution before operating 17. Prohibition of entering within swing range
3. Caution when leaving operator's seat 18. Caution for work equipment
4. Caution for high-voltage cables 19. Caution for handling battery
5. Caution for control pattern 20. Prohibition of start by short-circuiting
6. Caution when opening or closing front window 21. Caution for blast jobsite
7. Caution when stowing front window 22. Caution for high-pressure fuel
8. Caution for high-temperature oil 23. Caution for high temperature
9. Caution for high-temperature coolant 24. Caution for changing control pattern (machine
10. Caution for handling accumulator and gas spring equipped with control pattern change-over valve)
11. Caution for adjusting track tension 25. Caution for handling ROPS
12. Caution for handling cable 26. Caution for handling DEF
13. Stop rotation during inspection and maintenance 27. Caution for high temperature
14. Emergency escape 28. Caution for high-temperature resistance
15. Caution against falling

2-6
SAFETY SAFETY LABELS

CONTENTS OF SAFETY LABELS

Caution for operation, inspection and mainte-
nance
“09651-03001”

Caution before operating

“09802-03000”

Caution when leaving operator's seat

“09654-03001”

2-7
SAFETY LABELS SAFETY

Caution for high-voltage cables

“09801-03001”

Caution for control pattern

Standard machine
“09822-03000”

2-8
SAFETY SAFETY LABELS

Machine equipped with control pattern change-over valve

“21K-00–71270”

Caution when opening or closing front win-

dow
“09839-03001”

Caution when stowing front window

“09803-03000”

2-9
SAFETY LABELS SAFETY

Caution for high-temperature oil

“09653-03001”

Caution for high-temperature coolant

“09668-03001”

Caution for handling accumulator and gas

spring
“09659-53000”

Caution for adjusting track tension

“09657-03003”

2-10
SAFETY SAFETY LABELS

Caution for handling cable

“09808-03001” WARNING
Improper use of jumper cables and

battery cables can cause an

explosion resulting in serious injuly

or death.

Follow instructions in manual when

using jumper cable and battery

cables.

09808-03001

Stop rotation during inspection and mainte-

nance
“09667-43000”

Emergency escape
“09844-00050”

Caution against falling

“09805-13000”

2-11
SAFETY LABELS SAFETY

Caution when swinging and traveling in re-

verse
“09833-03000”

Prohibition of entering within swing range

“09133-23000”

Caution for work equipment

“09134-A1681”

Caution for handling battery

“09664-30013”

2-12
SAFETY SAFETY LABELS

Prohibition of start by short-circuiting

“09842-A0481”

Caution for blast jobsite

“09845-00480”

Caution for high-pressure fuel

“6217-71-9331”

Caution for high temperature

“09817-A0753”

2-13
SAFETY LABELS SAFETY

Caution for changing control patterns

Machine equipped with control pattern change-over valve
“22M-98-11181”

Caution for handling ROPS ROPS (for H/E) OPG TOP GUARD CERTIFICATION
This protective structure complies with the standard provided that it is properly equipped on the
machine which mass is less than the specified maximum mass.

ROPS : ISO 12117-2 : 2008 TOP GUARD LEVEL I ISO 10262 : 1998

“09620-T2001”“09620-B2171” MODEL
SERIAL No.
MACHINE MODEL
MAX. MASS kg (Lb)

- If any modification is applied to the ROPS , it m a y affect the strength an d

WARNING m a y n o t c om pl y w it h t he s t an da rd . D o no t d ri ll, c u t o r w e ld o n t h e ROP S
s t ru c t ur e . A n y m od i fi c a t io n is p ro hi b it e d.
- R OP S m a y pr ov id e les s pr ot ec t i on if i t h as bee n s t r u c t ur a ll y da m ag ed or
in v ol v e d i n ro l l- ov e r. C on s u lt K om a t s u D is tr ib u to r i n t h a t c a s e .
- Al w a y s w e a r s ea t be l t w he n m o v in g .
09620 - B2171
Komatsu Ltd. 2-3-6 Akasaka, Minato-ku, Tokyo, Japan 09620 - T2001

Caution for handling DEF

“09632-31800”

Caution for high temperature

“22U-00-21940”

2-14
SAFETY SAFETY LABELS

Caution for high-temperature resistance

“2A6-00-11141”

2-15
GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTE-
NANCE SAFETY

GENERAL PRECAUTIONS COMMON TO OPERATION

AND MAINTENANCE
Mistakes in operation, inspection, or maintenance may result in serious personal injury or death. Before per-
forming operation, inspection, or maintenance, always read this manual and the safety labels on the machine
carefully and obey the warnings.

PRECAUTIONS BEFORE STARTING OPERATION

ENSURE SAFE OPERATION
• Only trained and authorized personnel can operate and maintain the machine.
• Follow all safety, precautions, and instructions in this manual when operating or performing inspection or
maintenance on the machine.
• If you are not feeling well, or if you are under the influence of alcohol or medication, your ability to safely
operate or repair your machine may be severely impaired, putting yourself and everyone else on your job
site in danger.
• When working with another operator or with the person on the worksite traffic duty, discuss the content of
the operation beforehand and use the determined signals when performing the operation.

UNDERSTAND THE MACHINE

Before operating the machine, read this manual thoroughly. If there is any place in this manual that you do not
understand, ask the person in charge of safety for explanation.

PREPARATIONS FOR SAFE OPERATION

PRECAUTIONS FOR SAFETY-RELATED EQUIPMENT
• Be sure that all guards, covers, cameras, and mirrors are in their proper position. Repair them immediately
if they are damaged.
• Understand the using method of the safety related devices and use them properly.
• Never remove any safety related devices. Always keep them in good operating condition.

INSPECT MACHINE
Check the machine before starting operations. If any abnormality is found, do not operate the machine until re-
pairs of the problem location have been completed.

WEAR WELL-FITTING CLOTHES AND PROTECTIVE EQUIPMENT

• Do not wear loose clothes or any accessories. If any of
these catch the control levers or protruding parts, it may
cause the machine to move unexpectedly, it is extremely
dangerous.
• Always wear a hard hat and safety shoes. Wear protective
eyeglasses, mask, gloves, ear plugs, and safety belt de-
pending on the work.
• Long hair hanging out from the hard hat is dangerous that
it may get caught up in the machine. Tie the hair up and be
careful not to be caught.
• Check that all personal protective items function properly
before using them.

2-16
 GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTE-
SAFETY NANCE

KEEP MACHINE CLEAN

• If you get on or off the machine or perform inspection and maintenance on the machine with mud or oil, you
may slip and fall, and it is dangerous. Wipe off any mud or oil from the machine. Always keep the machine
clean.
• If water gets into the electrical system, electric devices will
cause malfunctions, and the machine will cause error. If
the machine cause error, it may move unexpectedly and
cause serious personal injury or death. When washing the
machine with water or steam, do not allow the water or
steam to come into direct contact with electrical compo-
nents.
• If high-pressure water is sprayed directly onto camera, it
may cause failure. Defective camera cannot monitor sur-
rounding area. When cleaning, do not allow the high-pres-
sure water to get into camera directly, and wipe off any dirt
with soft cloth.
• When cleaning camera, if you stand on an unstable place, or take an unstable posture, you may fall and be
injured. Put proper stepladder or step on the level and firm ground, and clean the camera in secure posture.

PRECAUTIONS FOR INSIDE OPERATOR'S COMPARTMENT

• When entering the operator's compartment, always remove all mud and oil from the soles of your shoes.
If you operate the pedal with mud or oil affixed to your shoes, your foot may slip and this may cause a seri-
ous accident.
• Do not leave tools or machine parts lying around inside the operator's compartment. If tools or parts get into
the control devices, it may obstruct operation and cause the machine to move unexpectedly, resulting in
serious personal injury or death.
• Do not stick suction pads to the window glass. Suction pads act as a lens and may cause fire.
• Do not use a cellular phone when driving or operating the machine. This may lead to mistakes in operation,
and may cause serious personal injury or death.
• Never bring any dangerous objects such as flammable or explosive items into the operator's compartment.

PROVIDE FIRE EXTINGUISHER AND FIRST AID KIT

Observe the following precautions to prepare for action if any
serious personal injury or death or fire should occur.
• Be sure that fire extinguishers have been provided and
read the labels to ensure that you know how to use them
for the possibility of fires.
• Perform periodic inspection and maintenance to ensure
that the fire extinguisher can always be used.
• Provide a first aid kit in the storage point. Perform periodic
checks and add to the contents if necessary. ,&

IF ANY PROBLEM IS FOUND

If you find any problem in the machine during operation or maintenance (noise, vibration, smell, incorrect
gauges, smoke, oil leakage, etc., or any abnormal display on the warning devices or monitor), report to the per-
son in charge and take the necessary action. Do not operate the machine until the problem has been corrected.

2-17
GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTE-
NANCE SAFETY

PRECAUTIONS TO PREVENT FIRE

ACTIONS IF FIRE OCCURS
• Turn the starting switch to OFF position, and stop the engine.
• Use the handrails and steps to escape from the machine.
• Do not jump off the machine. There is the danger of falling and it may cause personal injury.
• The fume generated by a fire contains harmful materials which have a bad influence on your body when
they are inhaled.
Do not breathe the fumes.
• After a fire, harmful compounds may be left. If it touches your skin, it may have a bad influence on your
body.
Be sure to wear rubber gloves when handle the materials left after the fire.
The material of the gloves, which is recommended is polychloroprene (Neoprene) or polyvinyl chloride (in
the lower temperature environment).
When wearing cotton work gloves, wear rubber gloves under them.

PREVENT FIRE
Fire caused by fuel, oil, coolant, or window washer fluid
Do not bring any open flame close to flammable substances
such as fuel, oil, coolant, or window washer fluid. There is a
danger that they may catch fire. Always observe the following.
• Do not smoke or use any open flame near fuel or other
flammable substances.
• Shut down the engine before adding fuel.
• Do not leave the machine when adding fuel or oil.
• Tighten all the fuel and oil caps securely.
,&
• Be careful not to spill fuel on overheated surfaces or on
parts of the electrical system.
• After adding fuel or oil, wipe up any spilled fuel or oil.
• Put greasy rags and other combustible materials into a
safe container to maintain safety at the workplace.
• When washing parts with oil, use a non-flammable oil. Do
not use diesel fuel or gasoline. There is danger that they
may catch fire.
• Do not weld or use a cutting torch to cut any pipes or tubes
that contain combustible liquids. ,&
• Determine well-ventilated areas for storing oil and fuel.
Keep the oil and fuel in the specified place and do not allow unauthorized persons to enter.
• When performing grinding or welding work on the machine, move any flammable materials to a safe place
before starting.
Fire caused by accumulation of combustible material
• Remove any dry leaves, chips, pieces of paper, coal dust, or any other combustible materials accumulated
or affixed around the engine exhaust manifold, muffler, or battery, or inside the undercovers.
• To prevent fires from spreading sparks or burning particles from other fires, remove any combustible materi-
als such as dry leaves, chips, pieces of paper, coal dust, or any other combustible materials accumulated
around the cooling system (radiator, oil cooler) or inside the undercover.
Fire coming from electric wiring
Short circuits in the electrical system can cause fire. Always observe the following.
• Keep all the electric wiring connections clean and securely tightened.

2-18
 GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTE-
SAFETY NANCE

• Check the wiring every day for looseness or damage. Reconnect any loose connectors or refasten wiring
clamps. Repair or replace any damaged wiring.
Fire caused from piping
Check that all the hose and tube clamps, guards, and cushions are securely fixed in position.
If they are loose, they may vibrate during operation and rub against other parts. There is danger that this may
lead to damage to the hoses and cause high-pressure oil to spurt out, leading to fire and serious personal injury.
Fire around the machine due to highly heated exhaust gas
This machine is equipped with Komatsu Diesel Particulate Filter (hereafter KDPF).
KDPF is a device to purify the soot in the exhaust gas. Exhaust gas temperature may increase during the purifi-
cation process (regeneration). Do not bring any combustible material close to the outlet of the exhaust pipe.
When there are thatched houses, dry leaves or pieces of paper near the job site, set the system to the regener-
ation disable to prevent fire hazards due to highly heated exhaust gas during the aftertreatment devices regen-
eration. For the setting procedure, see “HANDLE Komatsu Diesel Particulate Filter (KDPF) (3-122)”.
Explosion caused by lighting equipment
• When checking fuel, oil, battery electrolyte, or coolant, always use lighting with anti-explosion specifica-
tions.
• When taking the electrical power for the lighting equipment from the machine, see “POWER SUPPLY OUT-
LET (3-117)”.

2-19
GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTE-
NANCE SAFETY

PRECAUTIONS WHEN GETTING ON OR OFF MACHINE

USE HANDRAILS AND STEPS WHEN GETTING ON OR OFF MACHINE
To prevent personal injury caused by slipping or falling off the machine, always observe the following.
• Use the handrails and steps marked by arrows in the fig-
ure on the right when getting on and off the machine.

• Always face the machine and maintain at least three-point

contact (both feet and one hand, or both hands and one
foot) with the handrails and steps to ensure that you sup-
port yourself.
• Before getting on and off the machine, check the handrails
and steps if there is any oil, grease, or mud on them. Wipe
it off immediately not to slip if any. In addition, tighten any
loose bolt of the handrails and steps.
If the handrails and steps are damaged or deformed, they
need to be repaired immediately. Ask your Komatsu dis- ,&
tributor to perform this work.
• Do not grip the control levers or lock lever when getting on or off the machine.
• Never climb on the engine hood or covers where there are no non-slip pads.
• Do not get on or off the machine with tools in your hand.
• Do not grab a foldable mirror as a handrail since it turns.

NO JUMPING ON OR OFF MACHINE

Getting on or off the moving machine can cause serious personal injury or death. Always observe the following.
• Never jump on or off the machine. Never get on or off a moving machine.
• If the machine starts to move when there is no operator on the machine, do not jump on to the machine and
try to stop it.

NO PEOPLE ON ATTACHMENTS
Never let anyone ride on the work equipment or other attachments. There is a hazard of falling and suffering
serious personal injury or death.

2-20
 GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTE-
SAFETY NANCE

PRECAUTIONS WHEN STANDING UP FROM OPERATOR'S SEAT

Before standing up from the operator's seat, such as when
opening or closing the front window or ceiling window, when re-
moving or installing the bottom window, or adjusting the posi-
tion of the seat, always lower the work equipment to the
ground, set lock lever (1) to lock position (L), and stop the en-
gine.
If the control levers are touched by mistake, there is danger
that the machine may suddenly move and cause serious per-
sonal injury or death.

PRECAUTIONS WHEN LEAVING MACHINE

If the proper procedures are not taken when parking the machine, the machine may suddenly move off by itself,
and this may lead to serious personal injury or death. Always observe the following.
When leaving the machine, always lower the work equipment
to the ground, set lock lever (1) to lock position (L), and stop
the engine. In addition, lock all places and always take the key
with you and keep it in the specified location.

EMERGENCY EXIT FROM OPERATOR'S CAB

• If it should be impossible to open the door of the cab, break the window glass with the hammer supplied
and use the window as an emergency escape.
For details, see “EMERGENCY ESCAPE HAMMER (3-114)” in this manual.
• When escaping, remove the pieces of glass from the window frame first and be careful not to cut yourself
on the glass. Be careful also not to slip on the broken pieces of glass on the ground.

DO NOT GET CAUGHT IN WORK EQUIPMENT

The clearance in the area around the work equipment changes according to the movement of the link. If you are
caught, this may lead to serious personal injury or death. Do not allow anyone near any of the rotating or tele-
scopic parts.

2-21
GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTE-
NANCE SAFETY

PRECAUTIONS RELATED TO PROTECTIVE STRUCTURES

The operator's compartment is equipped with a structure (such as ROPS, OPG) to protect the operator by ab-
sorbing the impact energy.
As for the machine equipped with ROPS, if the machine weight
(mass) exceeds the certified value (shown on ROLL-OVER
PROTECTIVE STRUCTURE (ROPS) CERTIFICATION plate),
ROPS will not be able to fulfill its function. Do not increase ma-
chine weight beyond the certified value by modifying the ma-
chine or by installing attachments to the machine.
Also, if the function of the protective equipment is impeded, the
protective equipment will not be able to protect the operator,
and the operator may suffer injury. Always observe the follow-
ing. ,&

• If the machine is equipped with a protective structure, do

not remove the protective structure and perform operations without it.
• If the protective structure is welded, or holes are drilled in it, or it is modified in any other way, its strength
may drop. Any modification is prohibited.
• If the protective structure is damaged or deformed by falling objects or by rolling over, its strength will be
reduced and it will not be able to fulfill its function properly. In such cases, always consult your Komatsu
distributor.
• Even if the protective structure is installed, always fasten your seat belt properly when operating the ma-
chine. If you do not fasten your seatbelt properly, it cannot display its effect.
Always fasten your seat belt while operating the machine.

PROTECTION AGAINST FALLING, FLYING OR INTRUDING OBJECTS

On jobsite where there is a danger of falling objects, scattering
fragments, and things which may intrude into operator's cab, in-
stall the necessary equipment to protect the operator depend-
ing on the working conditions.
• When operating on jobsite, such as mines or quarries
where there is a hazard of falling rocks, install falling object
protective structure (FOPS) and a front guard, and always
keep all the windows and doors closed when operating. In
addition, always check that there is no one except the op-
erator in the surrounding area where there is a danger of ,&
falling objects, scattering fragments.
• When performing demolition or breaker operations, install
a front guard and always keep all the windows closed dur-
ing operation. In addition, always check that there is no
one except the operator in the surrounding area where
there is a danger of falling objects, scattering fragments.
Above precautions are developed for the standard jobsite. De-
pending on the conditions of the jobsite, installation of addition-
al guards is necessary.
Do not operate the machine without the necessary guards. Be ,&
sure to consult with your Komatsu distributor about necessary
guards.

2-22
 GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTE-
SAFETY NANCE

UNAUTHORIZED MODIFICATION
• Komatsu will not be responsible for any personal injuries, product failures, physical loss or damage, or influ-
ence on the environment resulting from modifications made without authorization from Komatsu.
• Any modification made without authorization from Komatsu can create hazards. Before making a modifica-
tion, consult your Komatsu distributor.

PRECAUTIONS RELATED TO ATTACHMENTS AND OPTIONS

• Any personal injuries, product failures, physical loss or damage, or influence on the environment resulting
from the use of unauthorized attachments or parts will not be the responsibility of Komatsu.
• When installing optional parts or attachments, contact your Komatsu distributor for advice to any potential
problems or safety and legal requirements.
• The machine weight will not exceed ROPS certified value as long as the optional attachments written in the
attachment combination table of this manual are installed. When installing optional parts or attachments
which are not written in this manual, the machine weight must not exceed ROPS certified value. Always
contact your Komatsu distributor before installing.
• Installing some work equipment combinations may cause interference and damage with the cab or other
parts of the machine during operation and could cause serious personal injury or death. Before using unfa-
miliar work equipment, always check for potential interference while operating the machine. Always ensure
the operator's safety when working with unfamiliar work equipment.
• When installing and using optional attachments, always read the instruction manual for the attachment, and
the general information related to attachments in this manual.

PRECAUTIONS RELATED TO CAB GLASS

• If the cab glass is broken during operations, stop operations and repair the cab glass immediately.
• If the cab glass on the work equipment side is broken, there is a hazard that the operator may be directly hit
or caught in the work equipment. If the glass is broken, stop operation immediately and replace the glass.
• The ceiling window is made of plastic, so if it is scratched, the visibility will become poor and there is danger
that it may break. If the ceiling window is scratched, replace it with the new one as soon as possible. If the
ceiling window is scratched and is not replaced, there is a danger that any rocks falling on it will cause it to
break, leading to injury to the operator.

PRECAUTIONS WHEN RUNNING ENGINE INSIDE BUILDING

The engine exhaust gas contains substances that may damage
your health or even cause death. Start or operate the engine in
a place where there is good ventilation. If the engine or ma-
chine must be operated inside a building or underground,
where the ventilation is poor, take steps to ensure that the en-
gine exhaust gas is removed and that ample fresh air is
brought in.

,&

2-23
PRECAUTIONS FOR OPERATION SAFETY

PRECAUTIONS FOR OPERATION

PRECAUTIONS FOR JOBSITE
INVESTIGATE AND CONFIRM JOBSITE CONDITIONS
On the jobsite, there are various hidden dangers that may lead to serious personal injury or death. Before start-
ing operations, always check the following to confirm that there is no danger on the jobsite.
• Always be careful when performing operations near materials such as thatched roofs, dry leaves or dry
grass, because they are easily combustible and may cause fire.
• Check the terrain and condition of the ground at the jobsite, and determine the safest method of operation.
Do not operate in a dangerous area where landslides or rockfall may occur.
• If water lines, gas lines, or high-voltage electrical lines may
be buried under the jobsite, contact the management com-
pany to identify their locations, and be careful not to dam-
age any of these lines.
• Take necessary measures to prohibit anyone other than
the operator from coming close to the machine during op-
eration.
• In particular, if you need to operate on a road, protect pe-
destrian and cars by designating a person for jobsite traffic
duty or by installing fences around the jobsite.
• When traveling or operating in shallow water or on soft
ground, check the water depth, speed of the current, condition of bedrock, and shape of the ground before-
hand. Always avoid any place that will obstruct travel.

PRECAUTIONS WHEN WORKING ON LOOSE GROUND

• Avoid driving or operating the machine near the edge of cliffs, road edges, and deep ditches. The ground
may be weak in such areas. If the ground should collapse under the weight or vibration of the machine,
there is a hazard that the machine may fall or tip over. Remember that the soil is weak in these areas, after
heavy rain or blasting or after earthquakes.
• When working on embankments or near excavated ditches, there is a hazard that the weight and vibration
of the machine will cause the soil to collapse. Before starting operations, take steps to ensure that the
ground is safe and to prevent the machine from rolling over or falling.

2-24
SAFETY PRECAUTIONS FOR OPERATION

DO NOT GO CLOSE TO HIGH-VOLTAGE CABLES

Do not travel or operate the machine near electric cables. There is a hazard of electric shock, which may cause
serious personal injury or death. On jobsites where the machine may go close to electric cables, always observe
the following.
• Before starting work near electric cables, inform the local
power company of the work to be performed, and ask
them to take the necessary action.
• Even going close to high-voltage cables can cause electric
shock. Always maintain a safe distance (see the table) be-
tween the machine and the electric cable. Check with the
local power company about the voltage of cables and safe
operating procedure before starting operations.
Voltage of Cables Safety Distance
100 V, 200 V Min. 2 m {7 ft} 
6600 V Min. 2 m {7 ft} 
22000 V Min. 3 m {10 ft} 
66000 V Min. 4 m {14 ft} 
154000 V Min. 5 m {17 ft} 
187000 V Min. 6 m {20 ft} 
275000 V Min. 7 m {23 ft} 
500000 V Min. 11 m {36 ft} 
• To prepare for any possible emergencies, wear rubber shoes and gloves. Lay a rubber sheet on the opera-
tor's seat, and be careful not to touch the chassis with any exposed part of your body.
• Use a signalman to give warning if the machine approaches too close to the electric cables.
• When performing operations near high voltage cables, prohibit anyone other than related persons to come
close to the machine during operation.
• If the machine should come too close or touch the electric cable, to prevent electric shock, the operator
should not leave the operator's compartment until it has been confirmed that the electricity has been shut
off. Also, prohibit any other persons to come close to the machine.

ENSURE GOOD VISIBILITY

Although this machine is equipped with mirrors and cameras to ensure good visibility, there are places that can-
not be seen from the operator's seat. Be careful when performing operation.
When driving the machine or performing operations in places with poor visibility, it is dangerous and may cause
serious personal injury or death because it is difficult to check for obstacles and condition of the jobsite. When
driving the machine or performing operations in places with poor visibility, always observe the following.
• Allocate a signalman for jobsite duty if there are areas where the visibility is poor.
• Only one signalman should give signals.
• When working in dark places, turn on the working lamp and headlamps installed to the machine, and set up
additional lighting in the work area if necessary.
• Stop operations if the visibility is poor because of mist, snow, rain, or dust.
• When checking the mirrors installed to the machine, remove all dirt and adjust the angle of the mirror to
ensure good visibility.
• Clean off any dirt from the lens of cameras installed to the machine, and make sure that the camera gives a
clear view.

2-25
PRECAUTIONS FOR OPERATION SAFETY

CHECK SIGNS AND SIGNALMAN'S SIGNALS

If signals and labels are not clear, serious personal injury can result from downward slip, overturn or accidental
contact with nearby people or obstacles. Always observe the following.
• Set up labels to inform of road edges and soft ground. If the visibility is not good, position a conductor if
necessary. Operator should pay careful attention to the labels and follow the instructions from the conduc-
tor.
• Only one signalman should give signals.
• Make sure that all workers understand the meaning of all signals, signs, and labels before starting work.

BEWARE OF ASBESTOS DUST

Asbestos dust in the air can cause lung cancer if it is inhaled.
There is danger of inhaling asbestos when working on jobsite
where demolition work is performed or industrial waste is han-
dled. Always observe the following.
• Spray water to keep down the dust.
• Do not use compressed air.
• If there is danger that there may be asbestos dust in the
air, always operate the machine from an upwind position,
and make sure that all workers operate on the upwind ,&
side.
• All workers should use anti-dust masks.
• Prohibit anyone other than the operator from coming close to the machine during operation.
• Always observe the regulations for jobsite and environmental standards.
This machine does not contain asbestos, but any part which is not the genuine part, it has risk of containing
asbestos. Always use Komatsu genuine parts.

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SAFETY PRECAUTIONS FOR OPERATION

START ENGINE
USE WARNING TAGS
If there is a "DANGER! Do NOT operate!" warning tag dis-
played, it means that someone is performing inspection and
maintenance of the machine. If the warning tag is ignored and
the machine is operated, the person performing inspection or
maintenance may be caught in the rotating parts or moving
parts. It is dangerous and may cause serious personal injury or
death. Do not start the engine or touch the levers.

CHECKS AND ADJUSTMENT BEFORE STARTING ENGINE

Perform the following checks before starting the engine at the beginning of the day's work to ensure that there is
no problem with the operation of the machine. If these checks are not performed properly, problems may occur
with the operation of the machine, and there is a danger which may lead to serious personal injury or death.
• Remove all dirt from the surface of the window glass to ensure a good view.
• Perform the walk-around check securely according to “METHOD FOR WALK-AROUND CHECK (3-150)”.
• Remove all dirt from the surface of the lens of the headlamps and working lamps, and check that they light
up correctly.
• Check the coolant level, fuel level, and oil level in engine oil pan, check for clogging of the air cleaner, and
check for damage to the electric wiring.
• Check that there is no mud or dust accumulated around the movable parts of any pedals, and check that
the pedals work properly.
• Adjust the operator's seat to a position for easier operation. Check that there is no damage or wear to the
seat belt or mounting clamps.
• Check that the gauges work properly, check the angle of the mirror, and check that the control levers are all
at NEUTRAL position.
• Before starting the engine, check that lock lever (1) is in
LOCK position (L).
• Adjust the mirrors to have a good rear view from the oper-
ator's seat.
For the adjustment, see “METHOD FOR ADJUSTING
MIRRORS (3-169)”.
• Adjust the mirrors to have a good view of the surrounding
area from the operator's seat.
For the adjustment, see “METHOD FOR ADJUSTING
REAR VIEW CAMERA ANGLE (3-177)”.
• Adjust the armrest to a position for easier operation, and
fix it securely. Operation in an improper position can cause a serious personal injury or death.

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PRECAUTIONS FOR OPERATION SAFETY

For the adjustment, see “METHOD FOR ADJUSTING OPERATOR'S SEAT (3-164)”.
• Check that there are no persons or obstacles above, below, or in the area around the machine.

PRECAUTIONS WHEN STARTING ENGINE

The machine may suddenly move off and this may lead to serious personal injury or death. Always observe the
following.
• Start the engine only while sitting down in the operator's seat.
• When starting the engine, sound the horn as a warning.
• Prohibit anyone other than the operator to get on the machine.
• Do not attempt to start the engine by short-circuiting the engine starting circuit. This may cause fire, serious
personal injury or death.

IN COLD WEATHER
• If the warm-up operation is not performed thoroughly, and the work equipment is operated, the reaction of
the work equipment to the operation of the control levers and pedals will be slow and the movement of it
may not be what the operator intended. Be sure to perform the warm-up operation. Particularly in a cold
weather, be sure the warming-up operation is completed.
• If the battery electrolyte is frozen, do not charge the battery or start the engine with a different power
source. There is a hazard that this will ignite the battery and cause the battery to explode.
Before charging or starting the engine with a different power source, melt the battery electrolyte and check
that there is no leakage of electrolyte before starting.

START ENGINE WITH JUMPER CABLES

If any mistake is made in the method of connecting the jumper cables, it may cause the battery to explode, so
always observe the following.
• Always wear protective eyeglasses and rubber gloves
when starting the engine by using the jumper cables.
• When connecting a normal machine to a failed machine
with the jumper cables, always use the normal machine
with the same battery voltage as the failed machine.
• When starting the engine with the jumper cables, perform
the starting operation with 2 workers (one worker sitting in
the operator's seat and the other working with the battery).
• When starting from another machine, be careful that the
normal machine does not contact with the failed machine.
• When connecting the jumper cables, turn the starting
switch to OFF position for both the failed machine and the normal machine. If the failed machine has a bat-
tery disconnect switch, turn it to OFF position, and turn it ON again after connecting the cables.
For details of operation of the battery disconnect switch, see “BATTERY DISCONNECT SWITCH (3-120)”.
It is dangerous that the machine may move when the power is connected.
• Be sure to connect the positive (+) cable first when installing the jumper cables. Disconnect the negative (-)
cable (ground side) first when removing them.
• When disconnecting the jumper cables, take care not to bring the clips in contact with each other or with the
machine.
• For the starting procedure with the jumper cables, see OPERATION, “START ENGINE WITH JUMPER CA-
BLES (3-278)”.

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SAFETY PRECAUTIONS FOR OPERATION

PRECAUTIONS FOR OPERATION

CHECKS BEFORE OPERATION
If the checks before starting are not performed properly, the machine will be unable to display its full perform-
ance. It is dangerous and may cause serious personal injury or death.
When performing the checks, move the machine to a wide area with no obstructions, and pay careful attention
to the surroundings. Prohibit anyone other than the operator from coming close to the machine during checks.
• Fasten the seatbelt. When the brakes are applied sudden-
ly, the operator may be thrown out of the operator's seat. It
is dangerous and may cause personal injury.
• Check that the movement of the machine matches the dis-
play on the control pattern card.
If it does not match, replace it immediately with the correct
control pattern card.
• Check the operating condition of the machine, work equip-
ment, and travel and swing systems.
• Check for any problem in the sound, vibration, heat and
smell of the machine, or abnormalities of instruments. Also
check that there is no leakage of oil or fuel.
• If any problem is found, repair it immediately.

PRECAUTIONS WHEN TRAVELING IN FORWARD OR REVERSE AND SWINGING

• When driving the machine, drive with sprocket (1) at the
rear of the machine. If sprocket (1) is at the front, the oper-
ation of the travel levers will be the opposite of the actual
direction of travel, so there is a hazard that the machine
may travel in an unexpected direction, leading to serious
injury or death.
• Always lock all the doors and windows of the operator's
compartment in position regardless of whether it is open or
closed.
Always close all the windows and doors on jobsites where
there is danger of scattering fragments, and things which
may intrude into operator's cab.
• Prohibit anyone other than the operator to get on the machine.
• If there are any people in the area around the machine, there is danger that they may be hit or caught by
the machine, and this may lead to serious personal injury or death. Before starting travel or swing, be sure
to observe the following.

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PRECAUTIONS FOR OPERATION SAFETY

• Always operate the machine only when seated on the

operator's seat.
• Before starting to move, check again that there is no
people or obstacle in the surrounding area.
• Before moving, sound the horn to warn people in the
surrounding area.
• Check that the travel alarm and other alarms work
properly.
• If there is an area in the rear of the machine which ,&
cannot be seen, position a signalman. Be extremely
careful not to hit any people or object, and drive or
swing slowly.
Always be sure to perform the above precautions even when
the machine is equipped with mirrors and cameras.

,&

PRECAUTIONS WHEN TRAVELING

Serious personal injury or death can result from tipping over of the traveling machine or its accidental contact.
Always observe the following.
• When driving the machine or performing operations, always keep a safe distance from people, structures,
or other machines to avoid coming into contact with them.
• When traveling on a level ground, keep the work equip-
ment approximately 40 to 50 cm {16 to 20 in} above the
ground. If that height is not maintained between the work
equipment and the ground, the work equipment may get
stuck in the ground and the machine may tip over.
• If the view to the right side is poor, raise the boom to en-
sure better visibility.
• Always turn the auto-deceleration switch OFF (cancel)
when driving the machine on rough ground or steep
slopes. If the machine is operated with the auto-decelera-
tion system ON (activated), the engine speed will rise and
the machine travel speed may suddenly become faster.
• Try to avoid traveling over obstacles. If the machine has to
travel over an obstacle, keep the work equipment close to
the ground and travel at low speed. The machine tips over
easily to the right or left. Do not drive it over obstacles
which make the machine tilt largely to the right or left.
• When driving the machine on the rough ground, drive it at
low speed and do not operate the steering suddenly. There
is a danger that the machine may tip over. The work equip-
ment may hit the ground, and the machine may lose its
balance, or it may damage the machine or structures in the
area.
• When using the machine, to prevent serious personal injury or death caused by the work equipment or by
the machine tipping over due to overloading, do not use the machine beyond the permitted performance of
the machine such as the maximum permitted load for the structure of the machine.

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SAFETY PRECAUTIONS FOR OPERATION

• When passing over bridges or structures, check first that the structure is strong enough to support the
weight of the machine. When passing on a public road, check with authorities concerned and observe their
instruction.
• When operating in tunnels, under bridges, under electric wires, or other places where the height is limited,
operate slowly and be extremely careful not to let the machine body or work equipment hit anything.

PRECAUTIONS WHEN TRAVELING ON SLOPES

To prevent the machine from tipping over or slipping to the side, always observe the following.
• Keep the work equipment approximately 20 to 30 cm {8 to
12 in}  above the ground. In case of emergency, lower the
work equipment to the ground immediately to help stop-
ping the machine.
• When driving the machine up slopes, set the operator's
cab facing uphill, when driving downhill , set the operator's
cab facing downhill. Always be sure of the safety of the
ground under the front of the machine when driving.

• When driving the machine t up a steep slope, extend the

work equipment to the front to improve the balance, keep
the work equipment approximately 20 to 30 cm {8 to 12 in} 
above the ground, and drive it at low speed.
• When driving the machine downhill, lower the engine
speed, keep the travel lever close to NEUTRAL position,
and drive it at low speed.
• Always drive the machine straight up or down a slope.
Driving the machine at an angle or across the slope is ex-
tremely dangerous.
• Do not turn on slopes or drive across slopes. Always go
down to a flat place to change the position of the machine,
then drive it on to the slope again.
• Do not drive the machine on a slope covered with the steel
plates. Even with slight slopes there is a hazard that the
machine may slip.
• Drive the machine at low speed on the grass or fallen
leaves. Even with slight slopes, there is a hazard that the
machine may slip.
• If the engine stops, move the control levers immediately to
NEUTRAL position, set the lock lever to LOCK position,
and then start the engine.

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PRECAUTIONS FOR OPERATION SAFETY

PRECAUTIONS WHEN OPERATING ON SLOPES

• When working on slopes, there is a hazard that the machine may lose its balance and turn over when per-
forming swing or work equipment operations. This may lead to serious personal injury or death. Always pro-
vide a stable place when performing these operations, and operate carefully.
• Do not swing the work equipment from the uphill side to
the downhill side when the bucket is loaded. This opera-
tion is dangerous, and may cause the machine to turn
over.
• If the machine has to be used on a slope, pile the soil to
make a platform (A) that will keep the machine as horizon-
tal as possible.
• Do not work on a slope covered with the steel plates. Even
with slight slopes there is a hazard that the machine may
slip.

PROHIBITED OPERATIONS
If the machine turns over or falls, or the ground at the working point collapses, or a structure being demolished
collapses, it may lead to serious personal injury or death. Always observe the following.
• It is dangerous to work under an overhang. Mudslide or
rockfall may occur, or the overhang may collapse. Never
perform digging under an overhang.

• Do not excavate too deeply under the front of the machine.

The ground under the machine may collapse and cause
the machine to fall.

• For a quick escape in an emergency, set the tracks at right

angles to the road shoulder or cliff with the sprocket at the
rear when performing operations.

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SAFETY PRECAUTIONS FOR OPERATION

• Do not demolish the structure where the machine is placed

on. It is dangerous that the structure may collapse and the
machine may fall.

• Do not demolish the structure above the machine. It is

dangerous that broken parts may fall or the structure may
collapse, and it may cause serious injury or death.

• Do not perform demolition work by using the impact force

of the work equipment. Scattered pieces of broken materi-
als, or damage of the work equipment, or the machine tip-
ping over due to reaction from the impact may cause seri-
ous personal injury or death.

• Do not pass the bucket over the heads of other workers or over the operator's seat of dump trucks or other
hauling equipment. There is a danger that the load may spill or the bucket may hit the dump truck and
cause serious personal injury or death.
• When working on or from the top of buildings or other structures, check the strength and the structure be-
fore starting operations. There is a hazard of the building collapsing and causing serious injury or death.
• Generally speaking, the machine is more liable to tip over when the work equipment is at the side than
when it is at the front or rear of the machine.
Be extremely careful when swinging the work equipment from the front or rear to the side of machine while
it is applied a load. It is dangerous that the machine may tip over.
• When using a breaker or other heavy work equipment, it is dangerous that the machine may lose its bal-
ance and tip over. When operating the machine on the flat ground as well as on slopes, observe the follow-
ing.
• Do not suddenly lower, swing, or stop the work equipment.
• Do not suddenly extend or retract the boom cylinder. It is dangerous that the machine may tip over by
the impact.

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PRECAUTIONS FOR OPERATION SAFETY

• In the operation using the fork or grapple, do not attempt to

pick up an object with the tips.
The picked up object can easily slip off. Machine may be
damaged, or personal injury or death may occur.

PRECAUTIONS WHEN OPERATING ON SNOW OR FROZEN SURFACES

• Snow-covered or frozen surfaces are slippery, so be extremely careful when traveling or operating the ma-
chine, and do not perform abrupt lever operation. Machine may slip even on a slight slope. Be particularly
careful when working on slopes.
• Frozen road becomes soft when the temperature rises, and the machine may tip over or be not able to es-
cape. Be particularly careful when working on frozen road.
• It is dangerous that the machine enters deep snow. The machine may tip over or become buried in the
snow. Be careful not to go off the road or to get trapped in a drift of snow.
• When performing snow removal, the road and objects placed beside the road are buried in the snow and
cannot be seen. Be careful.

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SAFETY PRECAUTIONS FOR OPERATION

PRECAUTIONS WHEN PARKING MACHINE

Unexpected move of the parked machine can cause serious personal injury or death. Always observe the fol-
lowing.
• Park the machine on a firm, level ground.
• Select a place where there is no hazard of landslides, fall-
ing rocks, or flooding.
• Lower the work equipment to the ground.

• When leaving the machine, set lock lever (1) to LOCK po-
sition (L), then stop the engine.
• Always close the operator's cab door, and use the key to
lock all the equipment in order to prevent any unauthorized
person from operating the machine. Always remove the
key, take it with you, and keep it in the specified place.

• If it is necessary to park the machine on a slope, always

observe the following.
• Set the work equipment on the downhill side and dig it
into the ground.
• In addition, block the tracks from movement.

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PRECAUTIONS FOR OPERATION SAFETY

PRECAUTIONS FOR TRANSPORTATION

When the machine is transported on a trailer, serious personal injury or death may result because of the acci-
dent during transportation. Always observe the following.
• Always check the machine dimensions carefully. Depending on the work equipment and optional devices
installed, the machine weight, transportation height, and overall length differ.
• Check beforehand that all bridges and other structures on the transportation route are strong enough to
withstand the combined weight of the transporter and the machine being transported.
• When the machine is transported on a public road, notify the authorities concerned and receive permission
of the transportation from them.
• This machine may need to be divided into components for transportation depending on the regulation.
When transporting the machine, consult your Komatsu distributor.

PRECAUTIONS WHEN LOADING AND UNLOADING

If handling is improper when loading or unloading the machine, it is dangerous that the machine may tip over or
fall. It requires particular attention. Always observe the following.
• Perform loading and unloading on a firm, level ground only. Avoid road edge or place near the cliff.
• Never use the work equipment to load or unload the machine. There is danger that the machine may fall or
tip over.
• Always use ramps of adequate strength. Be sure that the
ramps are wide, long, and thick enough to provide a safe
loading slope. Take suitable steps to prevent the ramps
from moving out of position or coming off.
(1) Chocks
(2) Ramp
(3) Center of ramp
(4) Angle of ramp: Max. 15 °.
• Be sure the ramp surface and the platform of trailer are
clean and free of grease, oil, ice, water and other loose
materials. If any, remove them. Remove dirt around the un-
dercarriage of the machine. On a rainy day, in particular, be extremely careful since the ramp surface is
slippery.
• Always turn the auto-deceleration switch OFF (cancel). If the machine is operated with the auto-decelera-
tion system ON (activated), there is danger that the engine speed will suddenly rise, the machine will sud-
denly move off, or the machine travel speed will become faster.
• Run the engine at low idle and drive the machine slowly at low speed.
• When on the ramps, do not operate any lever except for the travel lever (travel forward and reverse).
• Never correct your steering on the ramps. If necessary, drive off the ramps onto the ground, correct the di-
rection, then enter the ramps again.
• The center of gravity of the machine will change suddenly at the joint between the ramps and the loading
platform, and there is danger of the machine losing its balance. Drive slowly over this point.
• When loading or unloading to an embankment or platform, make sure that it has suitable width, strength,
and grade.
• When swinging the upper structure on the loading platform, lower the work equipment, retract it, and per-
form the operation slowly.
• Always fold the mirrors and stow the radio antenna.
For the method of folding the mirrors and stowing the antenna, see “STOW ANTENNA (3-249)” and
“METHOD FOR ADJUSTING MIRRORS (3-169)”.
For machines equipped with a cab, always lock the door after loading the machine. To prevent the door
from opening during transportation.
For detail, see “TRANSPORTATION (3-250)”.
• When it is necessary to remove handrails and steps, take care not to lose removed handrails and steps.

2-36
SAFETY PRECAUTIONS FOR OPERATION

Install the removed handrails and steps securely.

TOWING AND BEING TOWED

PRECAUTIONS FOR TOWING AND BEING TOWED
Always use the correct towing equipment and towing method. Any mistake in the selection of the wire rope or
drawbar or the method of towing a disabled machine and being towed may lead to serious personal injury or
death.
For towing, see “PRECAUTIONS FOR TOWING MACHINE (3-273)”.
• Always confirm that the wire rope or drawbar used for towing has ample strength for the weight of the ma-
chine being towed.
• Never use the wire rope which has cut strands (A), re-
duced diameter (B), or kinks (C). There is a danger that
the rope may break during the towing operation.
• Always wear leather gloves when handling the wire rope.
• Never tow a machine on a slope.
• During the towing operation, never stand between the tow-
ing machine and the machine being towed.

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PRECAUTIONS FOR OPERATION SAFETY

LIFTING OPERATION BY USING BUCKET WITH HOOK

PRECAUTIONS FOR LIFTING OPERATIONS
Falling of a lifted load or tipping over of the machine can cause serious personal injury or death. Always observe
the following.
• Do not perform lifting work on slopes, soft ground, or other places where the machine is not stable.
• Use wire rope that conforms to the specified standard.
• Do not perform any lifting operation with a load heavier than the specified lifting load. It may cause a seri-
ous accident such as tipping over of the machine.
For the maximum lifting load of this machine, see “HANDLE BUCKET WITH HOOK (6-4)”.
• Determine the signals to be used and place a signalman in position.
• Prohibit anyone to enter into place where there is danger of contact with a lifted load or the danger from a
falling load.
• It is dangerous if a lifted load hits any person or structure. When operating the swing or work equipment,
always check carefully that the surrounding area is safe.
• Do not start, swing, or stop the machine suddenly. It is dangerous that the lifted load may swing.
• Do not use the work equipment or swing to pull the load in
any direction. There is danger that the hook may break
and the load come off, causing the work equipment to
move suddenly and cause personal injury.
• Do not leave the operator's seat while the load is being lift-
ed.

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SAFETY PRECAUTIONS FOR MAINTENANCE

PRECAUTIONS FOR MAINTENANCE

PRECAUTIONS BEFORE STARTING INSPECTION AND MAINTENANCE
DISPLAY WARNING TAG DURING INSPECTION AND MAINTENANCE
During inspection and maintenance, always display the "DAN-
GER! Do NOT operate!" warning tag.
If there is a "DANGER! Do NOT operate!" warning tag dis-
played, it means that someone is performing inspection and
maintenance of the machine. If the warning tag is ignored and
the machine is operated, the person performing inspection or
maintenance may be caught in the rotating parts or moving
parts. It is dangerous and may cause serious personal injury or
death. Do not start the engine or touch the levers.
If necessary, put up signs around the machine as well.
Warning tag part No. 09963-03001
When not using this warning tag, keep it in the toolbox. If there
is no toolbox, keep it in the pocket for Operation and Mainte-
nance Manual

KEEP WORK PLACE CLEAN AND TIDY

• Do not leave hammers or other tools lying around in the work place. Wipe up all grease, oil, or other sub-
stances that will cause you to slip. Always keep the work place clean the tidy to enable you to perform oper-
ations safely. If the work place is not kept clean and tidy, there is the danger that you will trip, slip, or fall
over and injure yourself.
• When cleaning the ceiling window which is made of organic glass (polycarbonate), use tap water and avoid
use of organic solvents for cleaning. An organic solvent like benzene, toluene or methanol can invite a
chemical reaction like dissolution and decomposition on the window glass, deteriorating polycarbonate in
use.

SELECT SUITABLE PLACE FOR INSPECTION AND MAINTENANCE

• Stop the machine on a firm, level ground.
• Select a place where there is no hazard of landslides, falling rocks, or flooding.

ONLY AUTHORIZED PERSONNEL

As long as maintenance of the machine is continued, do not allow unauthorized person to come near the work-
place. They might get unexpected personal injury from, for instance, touching machine. Do not allow anyone
except the workers concerned to enter the workplace. If necessary, employ a guard.

APPOINT LEADER WHEN WORKING WITH OTHERS

When repairing the machine or when removing and installing the work equipment, appoint a leader and follow
his/hers instructions during the operation in order to prevent personal injuries caused by being caught or
pinched.

STOP ENGINE BEFORE CARRYING OUT INSPECTION AND MAINTENANCE

If you are caught or pinched between the work equipment during operation, or exposed to high-temperature or
high-pressure liquids, it is dangerous and may cause serious personal injury or death. Always observe the fol-
lowing.

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PRECAUTIONS FOR MAINTENANCE SAFETY

• Lower the work equipment to the ground and stop the en-
gine before performing any inspection and maintenance.

• Turn the starting switch to ON position. Operate the work

equipment control lever back and forth, right and left a few
times fully to release the remaining internal pressure in the
hydraulic circuit. Then move lock lever (1) to LOCK posi-
tion (L) and turn the starting switch to OFF position.
• Check that the battery relay is off and main power is not
conducted. (After turning the starting switch to OFF posi-
tion, wait for approximately 1 minute and press the horn
switch. If the horn does not sound, power is not conduct-
ed.)

• Block the tracks from movement.

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SAFETY PRECAUTIONS FOR MAINTENANCE

TWO WORKERS FOR MAINTENANCE WHEN ENGINE IS RUNNING

To prevent accident, do not perform maintenance with the engine running. When it is necessary to perform the
maintenance with the engine running, always observe the following.
• One worker must always sit in the operator's seat and be ready to stop the engine at any time. All workers
must maintain contact with the other workers.
• Rotating parts such as the fan, fan belt are dangerous that
they may easily catch a body part or an object someone
wears. Be careful not to come close to the rotating part.
• Never drop or insert tools or other objects into the fan, fan
belt, or other rotating parts. They may contact the rotating
parts and break, and be scattered. It is dangerous.
• If the automatic active regeneration of KDPF starts during
maintenance work, surroundings of KDPF become high
temperature. When performing maintenance work, perform ,&
regeneration disable of KDPF according to “HANDLE Ko-
matsu Diesel Particulate Filter (KDPF) (3-122)”.
• Release the remaining pressure in the hydraulic system,
and place lock lever (1) to LOCK position (L). For the pro-
cedure for releasing the remaining pressure, seeMETHOD
FOR CHECKING AND RELEASING NITROGEN GAS
CHARGE PRESSURE IN ACCUMULATOR (FOR CON-
TROL CIRCUIT) (4-75).
• Do not touch the control levers or pedals. When it is nec-
essary to operate the control levers or pedals, always give
a signal to your fellow workers to evacuate them to a safe
place.

PRECAUTIONS WHEN INSTALLING, REMOVING, OR STORING ATTACHMENTS

• Appoint a leader before starting removal or installation operations for attachments.
• Place attachments that have been removed from the ma-
chine in a stable condition so that they do not fall. And take
steps to prevent unauthorized persons from entering the
storage area.

,&

PRECAUTIONS FOR WORKING AT HIGH PLACES

When working at high places, use a step ladder or other stand to ensure that the work can be performed safely.
There is a danger falling from high place that can lead to serious personal injury or death.

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PRECAUTIONS FOR MAINTENANCE SAFETY

PRECAUTIONS WHEN WORKING ON MACHINE

• When performing maintenance work on the machine,
maintain the foothold clean and orderly to prevent falling.
Always observe the followings.
• Avoid spilling of oil and grease.
• Do not litter the tools.
• Watch your step when walking around on the ma-
chine.
• Remove mud and greases stuck to the shoe sole.
• Never jump down from the machine. When getting on and
off the machine, always face the machine and maintain at least three-point contact (both feet and one hand,
or both hands and one foot) with the handrails and steps to ensure that you support yourself.
• You must walk along the access aisle for checking being paved with non-slip pads. Never climb on the en-
gine hood and cover to prevent personal injuries from falling or failing over due to losing your footing.

PRECAUTIONS WHEN WORKING UNDER MACHINE OR WORK EQUIPMENT

Machine or work equipment may fall, and it is dangerous that serious personal injury or death may occur. Al-
ways observe the following.
• Make sure the hoists or hydraulic jacks you use are in good condition and strong enough to handle the
weight of the component. Never use hydraulic jacks at places where the machine is damaged, bent, or
twisted. Never use if the element wire of wire rope is frayed, twisted or pinched. Never use bent or distorted
hooks.
• It is extremely dangerous to work under the machine if the
track shoes are lifted off the ground and the machine is
supported only with the work equipment. If any of the con-
trol levers is touched by accident, or there is damage oc-
curring to the hydraulic piping, the work equipment or the
machine will suddenly fall. Never work under the work
equipment or the machine.
• If it is necessary to raise the work equipment or the ma-
chine and then go under it to perform inspection or mainte-
nance, support the work equipment and machine securely ,&
with blocks and stands strong enough to support the
weight of the work equipment and machine.
If the work equipment and machine are not supported, they may come down and it may cause serious per-
sonal injury or death.
• Never use concrete blocks for supports. Concrete blocks may break under even light loads.

USE PROPER TOOLS

Use the tools suited to the task and use them correctly. Using
damaged, deformed, or low quality tools, or making improper
use of the tools may cause serious personal injury or death.

,&

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SAFETY PRECAUTIONS FOR MAINTENANCE

PRECAUTIONS FOR CHECK AND MAINTENANCE

TURN BATTERY DISCONNECT SWITCH TO OFF POSITION
In the following cases, turn the starting switch to OFF position and check that the system operating lamp is off.
Then set the battery disconnect switch to OFF position and remove the switch key.
If you check and handle battery without turning battery disconnect switch to OFF position, serious personal in-
jury or death by such as an electric shock may occur.
• When storing the machine for a long time (more than 1 month)
• When repairing the electrical system
• When performing electric welding
• When handling the battery
• When replacing the fuse, etc.

PRECAUTIONS FOR WELDING

Welding operations must always be performed by a qualified welder and in a place equipped with proper equip-
ment. There is a hazard of gas, fire, or electric shock when performing welding, so never allow any unqualified
person to perform welding.

HANDLE BATTERY
Before inspecting or handling the battery, turn the key in the starting switch to OFF position and check that the
system operating lamp is off. Then set the battery disconnect switch to OFF position and remove the switch key.
Danger of battery exploding
When the battery is being charged, flammable hydrogen gas is generated and may explode. In addition, the bat-
tery electrolyte includes dilute sulphuric acid. Any mistake in handling may cause serious personal injury, explo-
sion, or fire, so always observe the following.
• Do not use or charge the battery if the battery electrolyte is below LOWER LEVEL mark. This may cause
an explosion. Always perform periodic inspection of the battery electrolyte level, and add purified water
(such as a commercial battery fluid) to UPPER LEVEL mark.
• Do not smoke or bring any open flame close to the battery.
• Hydrogen gas is generated when the battery is being
charged, so remove the battery from the machine, take it
to a well-ventilated place, remove the battery caps, then
perform the charging.
• After charging, tighten the battery caps securely.

Danger from dilute sulphuric acid

When the battery is being charged, flammable hydrogen gas is
generated and may explode. In addition, the battery electrolyte
includes dilute sulphuric acid. Any mistake in handling may
cause serious personal injury, explosion, or fire. Always ob-
serve the following.
• When handling the battery, always wear protective eye-
glasses and rubber gloves.
• If battery electrolyte gets into your eyes, immediately wash
your eyes with large amounts of fresh water. After that, get
,&
medical attention immediately.
• If battery electrolyte gets on your clothes or skin, wash it
off immediately with large amounts of water.

2-43
PRECAUTIONS FOR MAINTENANCE SAFETY

Danger of sparks
Sparks may be generated and they can cause a fire. Always observe the following.
• Do not let tools or other metal objects make any contact between the battery cables. Do not leave tools
lying around near the battery.
• When removing the battery cables, turn the starting switch to OFF position and, after checking that the sys-
tem operating lamp goes out, set the battery disconnect switch key to OFF position and pull it out.
When removing the battery cables, remove the ground cable (negative (-) cable) first. When installing, con-
nect the positive (+) cable first, then connect the ground.
• Tighten the battery cable terminals securely.
• Secure the battery firmly in the specified position.

PRECAUTIONS WHEN USING HAMMER

When using a hammer, pins may come out or metal particles may be scattered. It is dangerous and may cause
serious personal injury or death. Always observe the following.
• When hitting pins or bucket teeth, broken pieces may be scattered, and it may cause personal injury to the
people in the surrounding area. Always check that there is no one in the surrounding area.
• If hard metal parts such as pins, bucket teeth, cutting
edges, or bearings are hit with a hammer, pieces might be
scattered, and it may cause serious personal injury or
death. Always wear protective eyeglasses and gloves.
• If the pin is hit with strong force, it may come out, and in-
jure people in the surrounding area. Do not allow anyone
to enter the surrounding area.

,&

PRECAUTIONS FOR HIGH-TEMPERATURE COOLANT

To prevent burns from boiling water or steam spurting out when
checking or draining the coolant, wait for the coolant to cool
down to a temperature where the radiator cap can be touched
by hand. Then loosen the cap slowly to release the pressure in-
side the radiator, and remove the cap.

PRECAUTIONS FOR HIGH-TEMPERATURE OIL

To prevent burns from hot oil spurting out or from touching
high-temperature parts when checking or draining the oil, wait
for the oil to cool down to a temperature where the cap or plug
can be touched by hand. Then, loosen the cap or plug slowly to
release the internal pressure and remove the cap or plug.

2-44
SAFETY PRECAUTIONS FOR MAINTENANCE

PRECAUTIONS FOR HIGH-TEMPERATURE PARTS

To prevent burns from touching high-temperature parts, when checking or performing maintenance after stop-
ping engine, check the parts have been cooled down to touch with bare hand before checking or maintenance.

PRECAUTIONS FOR HIGH-PRESSURE OIL

The hydraulic system is always under internal pressure. In addition, the fuel piping is also under internal pres-
sure when the engine is running and immediately after the engine is stopped. When performing inspection or
replacement of the piping or hoses, check that the internal pressure in the circuit has been released. If this is not
done, serious personal injury or death may result. Always observe the following.
• Do not perform inspection or replacement work with the circuit under pressure.
Release the pressure. For details, see “METHOD FOR CHECKING AND RELEASING NITROGEN GAS
CHARGE PRESSURE IN ACCUMULATOR (FOR CONTROL CIRCUIT) (4-75)”.
• If there is any leakage from the piping or hoses, the surrounding area may be wet, so check for cracks in
the piping and hoses and for swelling in the hoses.
When performing inspection, wear protective equipment such as protective eyeglasses and leather gloves.
• High-pressure oil leaking from small holes is dangerous
that may penetrate your skin and cause loss of sight if it
contacts your skin or eyes directly. If a jet of high-pressure
oil hit your skin or eyes, and suffer injury, wash the place
with clean water, and consult a doctor immediately for
medical attention.

PRECAUTIONS FOR HIGH-PRESSURE FUEL

While the engine is running, high-pressure is generated in the engine fuel piping. If you try to disassemble the
piping before the internal pressure is released, serious personal injury or death can result. When performing in-
spection or maintenance of the fuel piping system, stop the engine and wait for at least 30 seconds to allow the
internal pressure to go down before starting the work.

HANDLE HIGH-PRESSURE HOSES AND PIPING

If oil or fuel leaks from high-pressure hoses or piping, it may cause fire or defective operation. It is dangerous
and may cause serious personal injury or death. If the hose or piping mounts are loose or oil or fuel is found to
be leaking from the mount, stop operations and tighten to the specified torque.
If any damaged or deformed hoses or piping are found, consult your Komatsu distributor.
Replace the hose if any of the following problems are found.
• Damaged hose or deformed hydraulic fitting.
• Frayed or cut covering or exposed reinforcement wire layer.
• Covering swollen in places.
• Twisted or crushed movable portion.
• Foreign material embedded in covering.

2-45
PRECAUTIONS FOR MAINTENANCE SAFETY

PRECAUTIONS FOR HIGH VOLTAGE

When the engine is running and immediately after it is stopped,
high voltage is generated inside the engine controller and the
engine injector, and there is danger of electric shock. Never
touch the inside of the engine controller or the injector part of
the engine. If it is necessary to touch the inside of the engine
controller or the injector part of the engine, consult your Komat-
su distributor.

PRECAUTIONS FOR NOISE

When performing maintenance of the engine and you are exposed to noise for long periods of time, wear ear
covers or ear plugs while working.
If the noise is too loud, it may cause temporary or permanent hearing problems.

PRECAUTIONS FOR HIGH-PRESSURE GREASE WHEN ADJUSTING TRACK

TENSION
• Grease is pumped into the track tension adjustment sys-
tem under high pressure. If the specified procedure for
maintenance is not followed when making adjustment,
grease drain plug (1) may fly out and cause serious injury
or death or property damage.
• When loosening grease drain plug (1) to loosen the track
tension, never loosen it more than 1 turn. Loosen the
grease drain plug slowly.
• Never put your face, hands, feet, or any other part of your
body close to grease drain plug (1).

DO NOT DISASSEMBLE RECOIL SPRING

Never disassemble the recoil spring assembly.
The recoil spring assembly has a powerful spring that acts to
reduce the impact on the idler. If it is disassembled by mistake,
the spring may shoot out and cause serious personal injury or
death. If it is necessary to disassemble it, ask your Komatsu
distributor to perform the work.

2-46
SAFETY PRECAUTIONS FOR MAINTENANCE

HANDLE ACCUMULATOR AND GAS SPRING

This machine is equipped with an accumulator. Even after the engine stops, if the work equipment control lever
is operated after stop of the engine in the direction to lower the work equipment, the work equipment goes down
with its own weight.
After stopping the engine, set the lock lever to LOCK position.
The accumulator and gas spring are charged with high-pressure nitrogen gas. If the accumulator is handled
mistakenly, it may cause an explosion. It is dangerous and may cause serious personal injury or death. Always
observe the following.
• Do not disassemble.
• Do not bring it near flame or dispose of it in fire.
• Do not make holes in it, weld it, nor use a cutting torch.
• Do not hit or roll the accumulator, or subject it to any im-
pact.
• When disposing of the accumulator, the gas must be re-
leased. Ask your Komatsu distributor to perform this work.

PRECAUTIONS FOR COMPRESSED AIR

• When performing cleaning with compressed air, there is a hazard of serious personal injury or death
caused by flying dust or particles.
• When using compressed air to clean the filter element or radiator, wear protective eyeglasses, anti-dust
mask, gloves, and other protective equipment.

MAINTENANCE OF AIR CONDITIONER

If air conditioner refrigerant gets into your eyes, it may cause loss of sight; if it contacts your skin, it may cause
frostbite. Never loosen any parts of the cooling circuit.

PRECAUTIONS FOR DISPOSING OF WASTE MATERIALS

To prevent pollution, pay full attention to the way to dispose of waste materials.
• Always drain the oil from your machine in containers. Nev-
er drain the oil and coolant directly onto the ground or
dump into the sewage system, rivers, seas, or lakes.
• Obey appropriate laws and regulations when disposing of
harmful objects such as oil, fuel, coolant, solvent, filters,
batteries, and DEF.

Avoid exposure to burning rubber or plastics which produce a toxic gas that is harmful to people.
• When disposing of parts made of rubber or plastics (hoses, cables, and harnesses), always comply with the
local regulations for disposing industrial waste products.

METHOD FOR SELECTING WINDOW WASHER FLUID

Use an ethyl alcohol base washer liquid.
Methyl alcohol base washer liquid may irritate your eyes, so do not use it.

2-47
PRECAUTIONS FOR MAINTENANCE SAFETY

PERIODIC REPLACEMENT OF DEFINED LIFE PARTS

• For using the machine safely for a long period, always perform periodic replacement of the defined life parts
that have a particularly close relation to safety, such as hoses and the seat belt.
Replacement of the defined life parts: See “PERIODIC REPLACEMENT OF DEFINED LIFE PARTS
(7-2)”.
• The material of these components naturally changes over time, and repeated use causes deterioration,
wear, and fatigue. As a result, there is a hazard that these components may fail and cause serious personal
injury or death. It is difficult to judge the remaining life of these components from external inspection or the
feeling when operating, so always replace them at the specified interval.
• Replace or repair the defined life parts if any defect is found, even when they have not reached the speci-
fied replacement time.

2-48
SAFETY PRECAUTIONS FOR DEF

PRECAUTIONS FOR DEF

GENERAL CHARACTER AND PRECAUTIONS FOR HANDLING
DEF is a colorless transparent 32.5% aqueous urea solution. Urea as main constituent is a material which is
used for cosmetics, medical and pharmaceutical products, and fertilizer, etc. The following situations require im-
mediate action:
• If it gets on your skin, it may cause inflammation. Immediately take the contaminated clothes or shoes off
and wash it off with water. In addition, use a soap to wash it off thoroughly. If your skin becomes irritated or
begins to hurt, immediately consult a doctor for treatment.
• Do not induce vomiting if swallowed. If swallowed, thoroughly rinse mouth with water and consult a doctor
for treatment.
• Avoid contact with the eyes. If there is contact, flush with clean water for several minutes and consult a doc-
tor for treatment.
• Wear protective eyeglasses when exposed to DEF to protect from solution splashing in your eyes. Wear
rubber gloves when you perform work handling DEF to avoid skin contact.

PRECAUTIONS FOR ADDING

Do not put fluid other than DEF into DEF tank. If diesel fuel or gasoline is added into the tank, it can cause a
fire. Some fluids or agents added can create and emit a toxic gas.
When opening the cap of DEF tank of the machine, the ammonia vapor may escape. Keep your face away from
the filler port during opening or refilling.

PRECAUTIONS FOR STORING

If the temperature of DEF becomes high, a harmful ammonia gas may be emitted. Completely seal up its con-
tainer for storage. Only open containers in a well-ventilated area. For the method of storing, see “STORE DEF
(4-9)”.
When storing DEF, avoid direct sunlight. Always use the original container it came in. Do not exchange the con-
tainer of DEF with another one. If DEF is stored in an iron or aluminum container, toxic gas may develop and a
chemical reaction may corrode the container.

PRECAUTIONS FOR FIRE HAZARD AND LEAKAGE

DEF is non-flammable; however, in the case of a fire it may generate an ammonia gas. Follow the instructions
and precautions according to “ACTIONS IF FIRE OCCURS (2-18)”.
If DEF is spilled, immediately wash and clean the area with water. If spilled DEF is left unattended and the area
is not washed and cleaned, it can cause corrosion to the contaminated area and emit toxic gas.

OTHER PRECAUTIONS
When disposing of DEF, treat it as an industrial waste. For treatment of the waste, see “PRECAUTIONS FOR
DISPOSING OF WASTE MATERIALS (2-47)”. The container for DEF is an industrial waste as well. It should be
treated in the same way.
Never use an iron or aluminum container when disposing DEF, because toxic gas may develop and a chemical
reaction may corrode the container. Use a container made of resin (PP, PE) or stainless steel when handling the
fluid waste of DEF.
Do not touch any fluid discharged from urea SCR. This fluid becomes acid by the influence of sulphur in the fuel
or built-in oxidation catalyzer. If it gets on your skin, thoroughly wash it off with water.
Never relocate or modify the exhaust gas aftertreatment devices. The harmful gas may be exhausted and it can
cause serious damage to the environment as well as violation of laws. For details, see “UNAUTHORIZED MOD-
IFICATION (2-23)”.

2-49
 OPERATION

Please read and make sure that you understand the SAFETY section before
reading this section.

3-1
GENERAL VIEW OPERATION

GENERAL VIEW
MACHINE EQUIPMENT NAME

(1) Bucket (7) Sprocket

(2) Bucket cylinder (8) Track frame
(3) Arm (9) Track
(4) Arm cylinder (10) Idler
(5) Boom (11) Engine hood
(6) Boom cylinder

3-2
OPERATION GENERAL VIEW

Detail of A and B parts

(12) Komatsu Closed Crankcase Ventilation (hereafter (17) Battery disconnect switch
KCCV) ventilator (18) System operating lamp
(13) SCR (19) Fusible link
(14) KDPF (20) Grease pump holder
(15) Toolbox
(16) Battery

3-3
GENERAL VIEW OPERATION

CAB EQUIPMENT NAMES

(1) Ceiling window (7) Cup holder

(2) Front window (8) Ashtray
(3) Emergency escape hammer (9) Auxiliary electric power (if equipped)
(4) Door lock release lever (10) Fuse
(5) Drink box (11) Fire extinguisher (if equipped)
(6) Magazine box (12) AUX

3-4
OPERATION GENERAL VIEW

CONTROLS AND GAUGES NAMES

(1) Radio (14) Machine push-up switch

(2) Lock lever (15) Ceiling window wiper switch (if equipped)
(3) L.H. work equipment control lever (16) Revolving lamp switch (if equipped)
(4) One-touch power maximizing switch (17) Attachment control pedal (if equipped)
(5) Travel pedal (18) Attachment control pedal (if equipped)
(6) Travel lever (19) Cigarette lighter
(7) Horn switch (20) Room lamp switch
(8) Machine monitor (21) Seat heater switch (if equipped)
(9) R.H. work equipment control lever (22) Engine shutdown secondary switch
(10) Starting switch (23) Pump secondary drive switch
(11) Fuel control dial (24) Swing parking brake cancel switch
(12) Lamp switch (25) Lock lever automatic lock cancel switch
(13) Swing lock switch

3-5
GENERAL VIEW OPERATION

MACHINE MONITOR EQUIPMENT NAME

AA: Standard screen, BB: Check before starting screen, CC: Maintenance time warning screen
(1) Wiper switch (22) Lock lever pilot lamp
(2) Buzzer cancel switch (23) Aftertreatment devices regeneration pilot lamp
(3) Auto-deceleration switch (24) Aftertreatment devices regeneration disable pilot
(4) Service meter/clock lamp
(5) ECO gauge (25) Message display
(6) Camera direction display (26) Air conditioner pilot lamp
(7) Hydraulic oil temperature gauge (27) Wiper pilot lamp
(8) Hydraulic oil temperature caution lamp (28) Swing lock pilot lamp
(9) Engine coolant temperature gauge (29) Engine preheating pilot lamp or One-touch power
maximizing pilot lamp
(10) Engine coolant temperature caution lamp
(30) Auto-deceleration pilot lamp
(11) Fuel gauge
(31) Working mode display
(12) Fuel level caution lamp
(32) Travel speed display
(13) DEF level gauge
(33) Radiator coolant level caution lamp
(14) DEF level caution lamp
(34) Engine oil level caution lamp
(15) Fuel consumption gauge
(35) Air cleaner clogging caution lamp
(16) Working mode selector switch
(36) Charge level caution lamp
(17) Travel speed selector switch
(37) Engine oil pressure caution lamp
(18) Window washer switch
(38) Function switches (F1 to F6)
(19) Air conditioner control switch
(39) Maintenance time caution lamp
(20) Seat belt caution lamp
(21) Engine stop pilot lamp

3-6
OPERATION GENERAL VIEW

REMARK
The above figure does not show all of the caution lamp symbols. For details of the caution lamps, see “WARN-
ING DISPLAY (3-19)”.

Displaying only meter

On the standard screen (camera display, meter display), press switch F3, and only the meter is displayed.
For details, see “CAMERA IMAGE SELECTOR SWITCH (3-55)”.

AA: Standard screen, BB: Check before starting screen, CC: Maintenance time warning screen
(1) Wiper switch (17) Working mode selector switch
(2) Buzzer cancel switch (18) Travel speed selector switch
(3) Auto-deceleration switch (19) Window washer switch
(4) Service meter/clock (20) Air conditioner control switch
(5) Engine coolant temperature caution lamp (21) Engine oil pressure caution lamp
(6) ECO gauge (22) Charge level caution lamp
(7) Engine coolant temperature gauge (23) Radiator coolant level caution lamp
(8) Hydraulic oil temperature gauge (24) Seat belt caution lamp
(9) Hydraulic oil temperature caution lamp (25) Engine stop pilot lamp
(10) Working mode display (26) Lock lever pilot lamp
(11) Travel speed display (27) Aftertreatment devices regeneration pilot lamp
(12) Fuel gauge (28) Aftertreatment devices regeneration disable pilot
(13) Fuel level caution lamp lamp

(14) DEF level gauge (29) Message display

(15) DEF level caution lamp (30) Air conditioner pilot lamp

(16) Fuel consumption gauge (31) Wiper pilot lamp

3-7
GENERAL VIEW OPERATION

(32) Swing lock pilot lamp (36) Air cleaner clogging caution lamp
(33) Engine preheating pilot lamp or One-touch power (37) Function switches (F1 to F6)
maximizing pilot lamp (38) Maintenance time caution lamp
(34) Auto-deceleration pilot lamp
(35) Engine oil level caution lamp
REMARK
The above figure does not show all of the caution lamp symbols. For details of the caution lamps, see “WARN-
ING DISPLAY (3-19)”.

3-8
OPERATION EXPLANATION OF COMPONENTS

EXPLANATION OF COMPONENTS
The following is an explanation of devices necessary to operate the machine.
To perform suitable operations correctly and safely, it is important to completely understand methods of operat-
ing the equipment, and the meanings of the displays.

EXPLANATION OF MACHINE MONITOR EQUIPMENT

AA: Standard screen, EE: Warning or Error screen, DD: Guidance screen
(1) Warning display (4) Monitor switch area
(2) Pilot display (5) Guidance icon display
(3) Meter display (6) Camera image display
REMARK
• For the user menu used for setting various items of the machine on the machine monitor, see “USER
MENU DISPLAY SWITCH (3-60)”.
• One of the features of liquid crystal display panels is that there may be black spots (spots that do not light
up) or white spots (spots that stay lit) on the screen. When there are fewer than 10 black or white spots, this
is not a failure or a defect.
• If environmental temperature of the machine monitor is high, brightness may be automatically reduced to
protect the liquid crystal. However, it is not abnormal.

When displaying only meter

On the standard screen (for camera display and meter display), you can shift the display to only the meter dis-
play by pressing switch F3.

3-9
EXPLANATION OF COMPONENTS OPERATION

For detail, see “CAMERA IMAGE SELECTOR SWITCH (3-55)”.

AA: Standard screen, EE: Warning or Error screen, DD: Guidance screen
(1) Warning display (4) Monitor switch area
(2) Pilot display (5) Guidance icon display
(3) Meter display
REMARK
• For the user menu used for setting various items of the machine on the machine monitor, see “USER
MENU DISPLAY SWITCH (3-60)”.
• One of the features of liquid crystal display panels is that there may be black spots (spots that do not light
up) or white spots (spots that stay lit) on the screen. When there are fewer than 10 black or white spots, this
is not a failure or a defect.
• If environmental temperature of the machine monitor is high, brightness may be automatically reduced to
protect the liquid crystal. However, it is not abnormal.

3-10
OPERATION EXPLANATION OF COMPONENTS

BASIC OPERATION OF MACHINE MONITOR

BASIC OPERATION OF MACHINE MONITOR WHEN STARTING ENGINE IN NOR-
MAL SITUATION

• When the starting switch is turned to ON position, the opening screen GG is displayed.
• After the opening screen GG is displayed for 2 seconds, the screen switches to the check before starting
screen BB.
• After the check before starting screen BB is displayed for 2 seconds, the screen switches to the working
mode/ travel mode display screen HH.
• After the working mode/ travel mode display screen HH is displayed for 2 seconds, the screen switches to
standard screen AA.
• If the working mode when the engine is started is B mode, the opening screen GG is displayed for 2 sec-
onds, and the screen switches to the breaker mode confirmation screen II.
When starting with B mode, press switch F6. If you do not want
to start B mode, press switch F5. In this case, the system starts
with E mode.
REMARK
When the engine is started, the battery voltage may suddenly
drop depending on the temperature and the battery condition. If
this happens, the machine monitor may restart, but this does
not indicate any abnormality.

3-11
EXPLANATION OF COMPONENTS OPERATION

BASIC OPERATION OF MACHINE MONITOR WHEN STARTING ENGINE WHILE

ENGINE SHUTDOWN SECONDARY SWITCH IS ON
While engine shutdown secondary switch (1) is ON (engine is
stopped), when the starting switch is turned to ON position, the
screen shown in the figure is displayed and engine does not
start.
If engine shutdown secondary switch (1) is turned OFF (nor-
mal), the machine monitor switches to the standard screen,
and you can start the engine with usual starting switch key op-
eration.
For the function and operating method of engine shutdown sec-
ondary switch (1), see “ENGINE SHUTDOWN SECONDARY
SWITCH (3-103)”.

BASIC OPERATION OF MACHINE MONITOR WHEN STOPPING ENGINE IN NOR-

MAL SITUATION

When the starting switch is turned to OFF position, end screen JJ or KK is displayed for 5 seconds, then the
display goes out.

3-12
OPERATION EXPLANATION OF COMPONENTS

End screen when any message has been re-

ceived.
If there is any message from your Komatsu distributor, it is dis-
played on the end screen.
In this case, turned the starting switch to ON position to re-
check the message, and if the message is requesting a re-
sponse, make a reply to it.
For the method of displaying and replying KOMTRAX messag-
es, see “MESSAGE DISPLAY (3-94)”.

BASIC OPERATION OF MACHINE MONITOR WHEN STARTING SWITCH IS ON

WHILE OPERATOR ID INPUT IS SET

• If inputting ID number for operator identification function (with SKIP) is set, the opening screen GG switches
to ID number input screen LL (with SKIP) when the starting switch is turned to ON position.
• If inputting ID number for operator identification function (without SKIP) is set, the opening screen GG
switches to ID number input screen MM (without SKIP) when the starting switch is turned to ON position.
• On the ID number input screen LL (with SKIP) or MM
(without SKIP), input the already registered ID number,
and press switch F6. The screen changes to the Check
Before Starting screen BB. If you input an incorrect ID
number, press switch F5, and clear an input character at a
time.

3-13
EXPLANATION OF COMPONENTS OPERATION

On the ID number input screen LL (with SKIP), press

switch F1, and the screen changes to the Check Before
Starting screen BB without inputting ID number.
REMARK
• Contact your Komatsu distributor for details of the method
of setting, changing, or canceling the operator identifica-
tion function.
• Depending on the set value of ID holding time, even if in-
putting ID number for operator identification function is set,
the ID number input screen LL (with SKIP) or MM (without
SKIP) may not be displayed while the starting switch is
turned to ON position.
If inputting incorrect ID number for 3 times continuously, you cannot input ID number for 5 minutes. Wait for
more than 5 minutes, try inputting ID number again.
As long as ID number input screen is displayed, the engine cannot be started. If you forget the ID number and
cannot start the engine, confirm the person in charge of the machine.
NOTICE
Since the purpose of the operator identification function is neither security enhancement nor a protec-
tion against theft, it has no antitheft effect. Be careful not to use it for the purpose of security enhance-
ment.
Komatsu cannot accept any responsibility for any loss or damage resulting from the wrong use of ID or
unauthorized use of ID by a third person.

3-14
OPERATION EXPLANATION OF COMPONENTS

BASIC OPERATION OF MACHINE MONITOR WHEN STARTING ENGINE IN AB-

NORMAL SITUATION

• If there is any abnormality when starting the engine, the check before starting screen BB changes to the
maintenance time warning screen CC, warning screen FF, or error screen EE.
• After displaying the checks before starting screen BB for 2 seconds, the screen changes to the mainte-
nance time warning screen CC.
• After displaying the maintenance time warning screen CC for 30 seconds, the screen returns to the stand-
ard screen AA.
• After displaying the check before starting screen BB for 2 seconds, the screen changes to the warning
screen FF-(1) or error screen EE.
• After displaying warning screen FF-(1) for 2 seconds, the screen automatically changes to warning screen
FF-(2).

3-15
EXPLANATION OF COMPONENTS OPERATION

If there is any abnormality currently generated, “！” is displayed

on top of switch F5.

Press switch F5 to check the detail of the error. Current Abnor-

mality screen is displayed.

3-16
OPERATION EXPLANATION OF COMPONENTS

BASIC OPERATION OF MACHINE MONITOR WHEN TROUBLE OCCURS WHILE

OPERATING MACHINE

• If any abnormality occurs during operation, the standard screen AA changes to warning screen FF-(1) or
the error screen EE.
• After displaying warning screen FF-(1) for 2 seconds, the screen automatically changes to warning screen
FF-(2).
If there is any abnormality currently generated, “！” is displayed
on top of switch F5.

3-17
EXPLANATION OF COMPONENTS OPERATION

Press switch F5 to check the detail of the current abnormality.

Current Abnormality screen is displayed.

3-18
OPERATION EXPLANATION OF COMPONENTS

WARNING DISPLAY
NOTICE
Appearance of any of action levels L01 to L04 on the machine monitor indicates presence of an abnor-
mality the machine.
Take appropriate actions following the list of action level displays and remedies.
The caution lamp that lights up in red when an action level is displayed warns operator to stop the ma-
chine urgently, stop or pause the current operation.
If no action is taken, the machine can be seriously affected. Take necessary actions immediately.

(1) Seat belt caution lamp (6) Engine coolant temperature caution lamp
(2) Caution lamp (7) Hydraulic oil temperature caution lamp
(3) Caution lamp (8) Fuel level caution lamp
(4) Caution lamp (9) Caution lamp
(5) Action level display
Standard screen (camera display and meter display)
When 1 type of caution is generated, it is displayed on caution lamp (2).
When 2 types of caution are generated, they are displayed on caution lamps (2) and (3).
When 3 types of caution are generated, they are displayed on caution lamps (2), (3), and (4).
When 3 types or more of caution are generated, they are displayed on caution lamps (2), (3), and (4) alternately
at intervals of 2 seconds.
Whole camera image display screen
The current cautions are indicated by flashing of caution lamp (9).
When 2 or more cautions are generated, they are sequentially displayed starting from the leftmost side of the
screen.
When displaying only meter
On the standard screen (camera display, meter display), press switch F3, and only the meter is displayed.

3-19
EXPLANATION OF COMPONENTS OPERATION

For detail, see “CAMERA IMAGE SELECTOR SWITCH (3-55)”.

(1) Seat belt caution lamp (5) Engine coolant temperature caution lamp
(2) Caution lamp (6) Hydraulic oil temperature caution lamp
(3) Caution lamp (7) Fuel level caution lamp
(4) Action level display (8) Caution lamp
Standard screen (only meters are displayed)
When 1 type of caution is generated, it is displayed on caution lamp (2).
When 2 types of caution are generated, they are displayed on caution lamps (2) and (3).
When 3 types or more of caution are generated, they are displayed on caution lamps (2) and (3) alternately at
intervals of 2 seconds.
Whole camera image display screen
The current cautions are indicated by flashing of caution lamp (8).
When 2 or more cautions are generated, they are sequentially displayed starting from the leftmost side of the
screen.

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OPERATION EXPLANATION OF COMPONENTS

ACTION LEVEL DISPLAY

Action level display indicates the degree of urgency of the ab-
normality currently generated on the machine by “L01” to “L04”.
The larger the number in the table is, the more serious effects
the abnormality may have on the machine if it is left with no ac-
tion.
If the machine monitor indicates an action level, check the
message displayed on the machine monitor.
By pressing switch F5 on the standard screen while the action
level is displayed, the list of the current abnormality is dis-
played.
For the display method of failures, see “CURRENT ABNOR-
MALITY DISPLAY SWITCH (3-24)”.
Take appropriate actions by following the message displayed
on the machine monitor.

List of action level display and remedies

Degree Action lev- Buzzer Caution lamp Required action
of ur- el
gency
High L04 Sounds contin- Lights up in Stop the machine immediately and ask your Komatsu distrib-
↑ uously red utor for inspection and maintenance.

│ L03 Sounds inter- Lights up in Stop the operation, move the machine to a safe place, then
mittently red ask your Komatsu distributor for inspection and maintenance.
│
│ L02 Sounds inter- Lights up in Stop the operation, and run the engine at medium speed with
mittently red no load or stop it.
│
If the condition is not improved, ask your Komatsu distributor
│ for inspection and maintenance.
↓
L01 Does not Lights up in Some functions may be restricted from use, but the machine
Low sound yellow can operate. When you finish the operation, always perform
the inspection and maintenance. Ask your Komatsu distribu-
tor for the inspection and maintenance as needed.

CAUTION LAMP LIST

NOTICE
• These caution lamps do not guarantee the condition of the machine.
Do not simply rely on the caution lamp when performing checks before starting (start-up inspec-
tion). Always get off the machine and check each item directly.
• When the caution lamp is displayed in red, if no action is taken, the machine can be seriously affect-
ed.
Take the action immediately.
• The engine output or engine speed is limited and the machine operation speed may become slow,
depending on the contents of the warning.

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EXPLANATION OF COMPONENTS OPERATION

Caution lamps and display colors

Display color/Machine condition (Action level)
Symbol Type of caution lamp
Red Yellow White Blue

Engine coolant temperature High temperature Low temper-

- Normal
caution lamp (L02) ature

Hydraulic oil temperature High temperature Low temper-

- Normal
caution lamp (L02) ature

Fuel level caution lamp Low level - - Normal

Abnormal Abnormal
System caution lamp - -
(L04/L03) (L01)

Hydraulic system caution Abnormal Abnormal

- -
lamp (L04/L03) (L01)

Abnormal Abnormal
KDPF system caution lamp - -
(L04/L03) (L01)

KDPF soot accumulation Abnormal Accumulated

- -
caution lamp (L03) (L01)

Abnormal
DEF level caution lamp - - -
(L04/L03)

Abnormal Abnormal
DEF system caution lamp - -
(L03) (L01)

Engine stopped
DEF system high tempera- at high tempera-
- ture - -
ture stop caution lamp
(L01)

Abnormal Abnormal
Engine system caution lamp - -
(L04/L03) (L01)

Engine oil pressure caution Low oil pressure

- - -
lamp (L03)

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OPERATION EXPLANATION OF COMPONENTS

Display color/Machine condition (Action level)

Symbol Type of caution lamp
Red Yellow White Blue

Low oil level

Engine oil level caution lamp - - -
(L01)

Radiator coolant level cau- Low coolant level

- - -
tion lamp (L01)

Abnormal
Charge level caution lamp - - -
(L03)

Air cleaner clogging caution Clogged

- - -
lamp (L01)

Air conditioner system cau- Abnormal

- - -
tion lamp (L01)

Maintenance time caution

Due time is over Notice - -
lamp

Seat belt is not

Seat belt caution lamp - - -
fastened

Abnormal
Engine overrun caution lamp - - -
(L02)

Excessive fre- Excessive fre-

Engine sudden stop by auto quency quency - -
idle stop caution lamp
(L03) (L01)

For the meaning of each caution lamp and the action to take for it, see the section of each caution lamp.

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EXPLANATION OF COMPONENTS OPERATION

CURRENT ABNORMALITY DISPLAY SWITCH

If there is any abnormality currently generated, “!” is displayed
on top of switch F5
While “!” is displayed, press switch F5 to shift the monitor dis-
play screen to the Current Abnormality screen.
Take appropriate remedies according to the message displayed
on the monitor.

Operation on the Current Abnormality screen

On the Current Abnormality screen, you can perform the follow-
ing operations with switches F1, F2 and F5.

F1: Displays next page. When on the last page, it displays the
first page.
F2: Displays the previous page. When on the first page, it dis-
plays the last page.

F5: Returns the screen to the standard screen.

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OPERATION EXPLANATION OF COMPONENTS

ENGINE COOLANT TEMPERATURE CAUTION LAMP

Engine coolant temperature caution lamp warns about states
caused by engine coolant temperature.
When abnormal
The caution lamp lights up in red and indicates action level
“L02”.
The engine coolant temperature is abnormally high.
While this monitor is lit, the overheat prevention system is auto-
matically actuated and the engine speed drops.
Stop operations and run it at low idle until the caution lamp
changes to the normal display color (blue) at an proper temper-
ature.
When temperature is low
The caution lamp lights up in white.
The engine coolant temperature is low.
The engine needs to be warmed up.
Perform the warm-up operation for the engine until the caution lamp changes to the normal display color (blue)
at an proper temperature.
For detail, see “METHOD FOR ENGINE WARM-UP OPERATION (3-188)”.
When temperature is correct
The caution lamp lights up in blue.

HYDRAULIC OIL TEMPERATURE CAUTION LAMP

The hydraulic oil temperature caution lamp warns about states
of hydraulic oil temperature.
When abnormal
The caution lamp lights up in red and indicates action level
“L02”.
The hydraulic oil temperature is abnormally high.
Stop operations, and stop the engine or run it at low idle until
the caution lamp changes to the normal display color (blue) at
an proper temperature.
When temperature is low
The caution lamp lights up in white.
The hydraulic oil temperature is low.
It is necessary to warm up the hydraulic component.
Perform the warm-up operation for the hydraulic component until the caution lamp changes to the normal dis-
play color (blue) at an proper temperature.
For detail, see “METHOD FOR HYDRAULIC SYSTEM WARM-UP OPERATION (3-191)”.
When temperature is proper
The caution lamp lights up in blue.

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EXPLANATION OF COMPONENTS OPERATION

FUEL LEVEL CAUTION LAMP

The fuel level caution lamp warns about low remaining fuel lev-
el.
When fuel level is low
The caution lamp lights up in red.
The remaining fuel amount is approximately 76 ℓ 
{20.1 U.S.Gal}  or less.
Add fuel as soon as possible.
When normal
The caution lamp lights up in blue.

SYSTEM CAUTION LAMP

The system caution lamp warns about abnormality in the ma-
chine system, including the sensors.
When action level “L04” is displayed
The caution lamp lights up in red and the alarm buzzer sounds
continuously.
Stop the machine immediately and ask your Komatsu distribu-
tor for inspection and maintenance.
When action level “L03” is displayed
The caution lamp lights up in red and the alarm buzzer sounds
intermittently.
Stop the operation and move the machine to a safe place, then ask your Komatsu distributor for inspection and
maintenance.
When action level “L01” is displayed
The caution lamp lights up in yellow.
Some functions may be restricted for use, but the machine can operate.
When you finish the operation, always perform the inspection and maintenance.
Ask your Komatsu distributor for inspection and maintenance as needed.

HYDRAULIC SYSTEM CAUTION LAMP

The hydraulic system caution lamp warns about abnormality in
the hydraulic system.
When action level “L04” is displayed
The caution lamp lights up in red and the alarm buzzer sounds
continuously.
Stop the machine immediately and ask your Komatsu distribu-
tor for inspection and maintenance.
When action level “L03” is displayed
The caution lamp lights up in red and the alarm buzzer sounds
intermittently.
Stop the operation and move the machine to a safe place, then ask your Komatsu distributor for inspection and
maintenance.
When action level “L01” is displayed
The caution lamp lights up in yellow.
Some functions may be restricted for use, but the machine can operate.
When you finish the operation, always perform the inspection and maintenance.
Ask your Komatsu distributor for inspection and maintenance as needed.

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OPERATION EXPLANATION OF COMPONENTS

KDPF SYSTEM CAUTION LAMP

The KDPF system caution lamp warns about abnormality in the
KDPF system.
When action level “L04” is displayed
The caution lamp lights up in red and the alarm buzzer sounds
continuously.
Stop the machine immediately and ask your Komatsu distribu-
tor for inspection and maintenance.
When action level “L03” is displayed
The caution lamp lights up in red and the alarm buzzer sounds
intermittently.
Stop the operation and move the machine to a safe place, then ask your Komatsu distributor for inspection and
maintenance.
When action level “L01” is displayed
The caution lamp lights up in yellow.
Some functions may be restricted for use, but the machine can operate.
When you finish the operation, always perform the inspection and maintenance.
Ask your Komatsu distributor for the inspection and maintenance as needed.
REMARK
For details of KDPF, see “HANDLE Komatsu Diesel Particulate Filter (KDPF) (3-122)”.

KDPF SOOT ACCUMULATION CAUTION LAMP

The KDPF soot accumulation caution lamp warns that soot is
accumulated in KDPF or the filtering function of KDPF has low-
ered abnormally.
To cancel the alarm, perform the manual stationary regenera-
tion of KDPF.
When abnormal
The caution lamp lights up in red and indicates action level
“L03”.
The alarm buzzer sounds intermittently.
Large accumulation of soot in KDPF or a system failure such
as lowering of the filtering function of KDPF occurred.
Urgent remedy is required.
Move the machine to a safe place immediately and perform the manual stationary regeneration.
The manual stationary regeneration may start automatically to protect KDPF system.
When soot is accumulated
The caution lamp lights up in yellow and indicates action level “L01”.
Much soot is accumulated in KDPF, however, the operation can be performed.
After the operation is finished, move the machine to a safe place and perform manual stationary regeneration.
REMARK
For details of the manual stationary regeneration, see “HANDLE Komatsu Diesel Particulate Filter (KDPF)
(3-122)”.

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EXPLANATION OF COMPONENTS OPERATION

DEF LEVEL CAUTION LAMP

DEF level caution lamp alerts when DEF tank level becomes
low.
Whenever the caution lamp lights up in red, immediately add
DEF.
Fault conditions that result in activation of the Inducement strat-
egy for engine derates to prompt to maintain or repair the emis-
sion control system.
When Lightning in red,
With Action level “L04”, DEF tank level is too low. Inducement
status is “Final Inducement”. Engine speed is fixed at low idle.
With Action level “L04”, DEF tank level is too low. Inducement status is “Severe Inducement”. Engine power is
under heavy deration.
With Action level “L03”, DEF tank level is low. Inducement status is “Mild Inducement”. Engine power is under
deration.
With No Action level display. DEF tank level is lower. Inducement status is “Escalated Warning”. Need to add
DEF immediately to avoid advancing to the next Inducement status.
With No Action level display. Warning starts. Inducement status is “Warning”. Need to add DEF immediately.
When Lightning in white
When fluctuation of DEF tank level is large, frozen, or not limited to, tank level sensing is not performed correct-
ly.
When DEF is added after engine starting switch turn to OFF.
When DEF tank level sensor is defective.
REMARK
For more information about the Inducement strategy, and Inducement status concerning engine power deration,
see “HANDLE UREA SCR SYSTEM WARNING (3-134)”.

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OPERATION EXPLANATION OF COMPONENTS

DEF SYSTEM CAUTION LAMP

DEF system caution lamp alerts when abnormality in the sys-
tem are detected.
Whenever the caution lamp lights up in yellow or in red, take
necessary actions by instructions.
Fault conditions that result in activation of the Inducement strat-
egy for engine derates to prompt to maintain or repair the emis-
sion control system.
Lighting in red
With Action level “L04”, Inducement status is “Final Induce-
ment”. Engine speed is fixed at low idle.
With Action level “L04”, Inducement status is “Severe Inducement”. Engine power is under heavy deration.
With Action level “L03”, Inducement status is “Mild Inducement”. Engine power is under deration.
Lighting in yellow
With Action level “L01”, Inducement status is “Warning” or “Escalated Warning”.
When “Escalated Warning”, If no maintenance, advancing to the next Inducement status. Engine power will be
derated.
REMARK
For more information about the Inducement strategy, and Inducement status concerning engine power deration,
see “HANDLE UREA SCR SYSTEM WARNING (3-134)”.

DEF SYSTEM HIGH TEMPERATURE STOP CAUTION LAMP

DEF system Temperature stop caution lamp alerts when the
times of engine is shut down under the condition of high degree
temperature of DEF system exceeds the defined number of
times.
Whenever the caution lamp lights up in yellow, it is necessary
to ask your Komatsu distributor to go off this caution lamp.
When stopping the engine, stop it after running it at low idle for
approximately 5 minutes. For details, see “METHOD FOR
STOPPING ENGINE (3-198)”.
When stopping the engine during the aftertreatment devices re-
generation, stop the regeneration first according to “PROCE-
DURE FOR AFTERTREATMENT DEVICES REGENERATION DISABLE SETTING (3-129)”, then stop the en-
gine after running it at low idle for approximately 5 minutes.

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EXPLANATION OF COMPONENTS OPERATION

ENGINE SYSTEM CAUTION LAMP

k CAUTION
If the operation is continued while the red caution lamp is lit, accumulation and combustion of the soot
in KDPF are accelerated, and consequently the temperature of KDPF and exhaust gas can increase
high. Stop the engine immediately.

The engine system caution lamp warns about abnormality in

the engine system.
When action level “L04” is displayed
The caution lamp lights up in red and the alarm buzzer sounds
continuously.
Stop the machine immediately and ask your Komatsu distribu-
tor for inspection and maintenance.
When action level “L03” is displayed
The caution lamp lights up in red and the alarm buzzer sounds
intermittently.
Stop the operation and move the machine to a safe place, then ask your Komatsu distributor for inspection and
maintenance.
When action level “L01” is displayed
The caution lamp lights up in yellow.
Some functions may be restricted for use, but the machine can operate.
When you finish the operation, always have the inspection and maintenance performed.
Ask your Komatsu distributor for the inspection and maintenance as needed.

ENGINE SUDDEN STOP BY AUTO IDLE STOP CAUTION LAMP

The auto idle stop sudden stop caution lamp warns the opera-
tor of a sudden engine stop caused by the auto idle stop func-
tion.
When action level “L03” is displayed
The caution lamp lights up in red and the alarm buzzer sounds
intermittently.
Stop the operation and move the machine to a safe place, then
ask your Komatsu distributor for inspection and maintenance.
When action level “L01” is displayed
The caution lamp lights up in yellow.
The engine durability may be lower but the machine can operate.
When you finish the operation, always perform the inspection and maintenance.
Ask your Komatsu distributor for inspection and maintenance as needed.

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OPERATION EXPLANATION OF COMPONENTS

ENGINE OIL PRESSURE CAUTION LAMP

Engine oil pressure caution lamp warns about abnormality of
engine lubricating oil pressure.
When oil pressure is low
The caution lamp lights up in red and indicates action level
“L03”.
The alarm buzzer sounds intermittently.
Stop the operation and move the machine to a safe place, then
ask your Komatsu distributor for inspection and maintenance.

ENGINE OIL LEVEL CAUTION LAMP

Engine oil level caution lamp warns about drop of engine lubri-
cating oil level.
It displays only while the engine is stopped.
When oil level is low
The caution lamp lights up in yellow and indicates action level
“L01”.
The oil level in the engine oil pan is insufficient.
Check the oil level in the oil pan and add oil.
For detail, see “METHOD FOR CHECKING OIL LEVEL IN EN-
GINE OIL PAN, ADDING OIL (3-157)”.
If the oil level drops again in a short time, the engine oil may be leaking.
For the inspection and maintenance, ask your Komatsu distributor.

ENGINE OVERRUN CAUTION LAMP

The engine overrun caution lamp lights up when engine over-
run occurs.
Since overrun can damage the engine and hydraulic compo-
nents, stop the work immediately and operate at low travel
speed until the overrun caution lamp goes off.

RADIATOR COOLANT LEVEL CAUTION LAMP

Radiator coolant level caution lamp warns about drop of radia-
tor coolant level.
When the coolant level dropped
The caution lamp lights up in yellow and indicates action level
“L01”.
The radiator coolant is insufficient.
Check the coolant level in the sub-tank of the radiator and add
coolant.
For detail, see “METHOD FOR CHECKING COOLANT LEVEL,
ADDING COOLANT (3-156)”.
If the coolant level drops again in a short time, the coolant may be leaking from the radiator.
Ask your Komatsu distributor for inspection and maintenance.

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EXPLANATION OF COMPONENTS OPERATION

CHARGE LEVEL CAUTION LAMP

Charge level caution lamp warns about abnormality in the
charging system while the engine is running.
When abnormal
The caution lamp lights up in red and indicates action level
“L03”.
The alarm buzzer sounds intermittently.
Charging is not be performed normally while the engine is run-
ning.
Stop the engine and check the alternator belt for damage, then
ask your Komatsu distributor for inspection and maintenance.
For detail, see “OTHER TROUBLE (3-280)”.

AIR CLEANER CLOGGING CAUTION LAMP

Air cleaner clogging caution lamp warns about clogging of the
air cleaner.
When clogged
The caution lamp lights up in yellow and indicates action level
“L01”.
The air cleaner is clogged.
Stop the engine and check and clean the air cleaner.
For detail, see “METHOD FOR CHECKING, CLEANING AND
REPLACING AIR CLEANER (4-16)”.

AIR CONDITIONER SYSTEM CAUTION LAMP

Air conditioner system caution lamp warns about abnormality in
air conditioner system.
When abnormal
The caution lamp lights up in yellow and indicates action level
“L01”.
The air conditioner system has abnormality.
Ask your Komatsu distributor for inspection and maintenance
as soon as possible.

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OPERATION EXPLANATION OF COMPONENTS

MAINTENANCE TIME CAUTION LAMP

Maintenance time caution lamp displays notices and alarms
concerning maintenance time.
This monitor lights up when the starting switch is turned to
“ON” position. It goes out after 30 seconds and the display
changes to the standard screen.
When the due time is over
The caution lamp lights up in red.
The maintenance time is over.
If no action is taken, the machine performance will become
worse and the machine life will be shortened.
Perform necessary maintenance as soon as possible.
When giving the notice of the due time
The warning lamp lights up in yellow.
The maintenance time is approaching.
Prepare necessary parts for the maintenance.
REMARK
• You can check maintenance items on the maintenance tab
screen by pressing switch F6 on the maintenance time
warning screen shown in the figure or on the standard
screen.
• The lighting time of maintenance time notice (yellow) has
been initially set to 30 hours, but it can be changed.
To change the setting, ask your Komatsu distributor.
• For operations on the maintenance tab screen, see “MAIN-
TENANCE SCREEN SETTING (3-83)”.

SEATBELT CAUTION LAMP

The seat belt caution lamp lights up when the seat belt is not
fastened. It goes out when the seat belt is fastened.
For details of the seat belt, see “METHOD FOR FASTENING
AND UNFASTENING SEAT BELT (3-180)”.

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EXPLANATION OF COMPONENTS OPERATION

PILOT DISPLAY AND METER DISPLAY

Pilot display
(1) Engine stop pilot lamp (8) Swing lock pilot lamp
(2) Lock lever pilot lamp (9) One-touch power maximizing pilot lamp
(3) Aftertreatment devices regeneration pilot lamp (10) Preheating pilot lamp
(4) Aftertreatment devices regeneration disable pilot (11) Auto-deceleration pilot lamp
lamp (12) Working mode display
(5) Message display (13) Travel speed display
(6) Air conditioner pilot lamp (14) ECO guidance
(7) Wiper pilot lamp
Meter display
(15) Engine coolant temperature gauge (19) Hydraulic oil temperature gauge
(16) DEF level gauge (20) Service meter/ clock
(17) Fuel consumption gauge (21) ECO gauge
(18) Fuel gauge

When displaying only meter

On the standard screen (camera display, meter display), press switch F3, and only the meter is displayed.

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OPERATION EXPLANATION OF COMPONENTS

For detail, see “CAMERA IMAGE SELECTOR SWITCH (3-55)”.

Pilot display
(1) Engine stop pilot lamp (8) Swing lock pilot lamp
(2) Lock lever pilot lamp (9) One-touch power maximizing pilot lamp
(3) Aftertreatment devices regeneration pilot lamp (10) Preheating pilot lamp
(4) Aftertreatment devices regeneration disable pilot (11) Auto-deceleration pilot lamp
lamp (12) Working mode display
(5) Message display (13) Travel speed display
(6) Air conditioner pilot lamp (14) ECO guidance
(7) Wiper pilot lamp
Meter display
(15) Engine coolant temperature gauge (19) Fuel consumption gauge
(16) Hydraulic oil temperature gauge (20) Service meter/ clock
(17) Fuel gauge (21) ECO gauge
(18) DEF level gauge

PILOT DISPLAY
The pilot display at the top of the screen consists of the pilot lamps to check the actuation of each function.
When the starting switch is turned on and the display items are functioning, the pilot lamps light up.

PREHEATING PILOT LAMP

The preheating pilot lamp is displayed while the engine is pre-
heated before started.
When the temperature is low (in cold weather) and the auto-
matic preheating function operates, the preheating pilot lamp
lights up. When the preheating is completed, it goes out.
Automatic preheating is for a maximum of approximately 40
seconds.

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EXPLANATION OF COMPONENTS OPERATION

SWING LOCK PILOT LAMP

Swing lock pilot lamp informs that the swing lock is being actu-
ated.
Lights up: The swing lock is being actuated.
When the swing lock switch is turned ON (LOCK), this lamp
lights up.
When the swing parking brake cancel switch is turned to "Can-
cel" position, this lamp flashes.
For the locations of the swing lock switch and swing parking
brake cancel switch, see “CONTROLS AND GAUGES NAMES
(3-5)”.
REMARK
The swing motor is equipped with a disc brake that mechanically stops the rotation. When the swing lock pilot
lamp is lit, the brake remains applied.

WIPER PILOT LAMP

The wiper pilot lamp shows the operating state of the wind-
shield wiper.
The operation of the wiper switch is indicated by the pilot lamp
as follows.
When ON lights up: Windshield wiper operates continuously
When INT lights up: Windshield wiper operates intermittently
When nothing lights up: Wiper stops
For the position of the windshield wiper switch, see “MACHINE
MONITOR EQUIPMENT NAME (3-6)”.

AUTO-DECELERATION PILOT LAMP

The auto-deceleration pilot lamp shows the setting of the auto-
deceleration either ON or OFF.
The pilot lamp display when the auto-deceleration switch is op-
erated is as follows.
Auto-deceleration pilot lamp lights up: Auto-deceleration ON
Auto-deceleration pilot lamp goes out: Auto-deceleration OFF
For the location of the auto-deceleration switch, see “MA-
CHINE MONITOR EQUIPMENT NAME (3-6)”.

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OPERATION EXPLANATION OF COMPONENTS

WORKING MODE DISPLAY

The working mode display shows the setting of the working
mode.
The working mode set with the working mode selector switch is
shown as follows.
P: P mode (for heavy-load operations)
E: E mode (for operations with emphasis on fuel consumption)
L: L mode (for fine control operations)
B: B mode ( for breaker operations) (For machines ready for in-
stallation of attachments)
ATT/P: ATT/P mode (for operations of 2-way attachments like
crusher, etc.)
ATT/E: ATT/E mode (for operations of 2-way attachments like crusher in emphasis of fuel consumption)
• For the location of the working mode selector switch, see “MACHINE MONITOR EQUIPMENT NAME
(3-6)”.
• When E mode is selected, E0 to E03 are displayed. For details, see “ADJUST ECONOMY MODE (3-72)”.

TRAVEL SPEED DISPLAY

The travel speed display shows the set mode of the travel
speed.
The travel speed is indicated as follows according to the setting
of the travel speed selector switch.
Lo: Low-speed travel
Mi: Mid-range speed travel
Hi: High-speed travel
For the position of the travel speed selector switch, see “MA-
CHINE MONITOR EQUIPMENT NAME (3-6)”.

ONE-TOUCH POWER MAXIMIZING PILOT LAMP

One-touch power maximizing pilot lamp shows if the one-touch
power maximizing function is being actuated.
The following pilot lamp is displayed when the knob switch on
the L.H. control lever is operated. (The actual pilot lamp display
is shown at the position of preheating pilot lamp (1).)
Pilot lamp lights up: Digging power increases while the knob
switch is kept pressed (for a maximum of 8.5 seconds).
Pilot lamp goes out: Power maximizing function stopped
For the position of the knob switch, see “MACHINE MONITOR
EQUIPMENT NAME (3-6)”.
REMARK
Only when the working mode is P, E, ATT/P, and ATT/E mode, the power is increased while the knob switch is
being pressed. Even if the knob switch continues to be pressed, the power increase is finished after 8.5 sec-
onds.

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EXPLANATION OF COMPONENTS OPERATION

AIR CONDITIONER PILOT LAMP

The air conditioner pilot lamp shows the operating state of the
air conditioner.
Pilot lamp lights up: Air conditioner ON
Pilot lamp goes out: Air conditioner OFF

MESSAGE DISPLAY
The message display lights up when there is a message from
Komatsu.
To read the message, see “MESSAGE DISPLAY (3-94)”.
Lights up in green (A): There is unread message.
Lights up in blue (B): There is any read message to which no
reply is made.
OFF: No messages

ENGINE STOP PILOT LAMP

The engine stop pilot lamp is displayed while the engine is
stopped. It goes out when the engine is started.

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OPERATION EXPLANATION OF COMPONENTS

AFTERTREATMENT DEVICES REGENERATION PILOT LAMP

k CAUTION
• Exhaust gas temperature may increase higher than the previous models during the aftertreatment
devices regeneration. Stay away from the exhaust pipe outlet to prevent yourself from getting burnt.
Also, keep combustible materials away from the exhaust pipe outlet to prevent a fire.
• When there are thatched houses, dry leaves or pieces of paper near the job site, set the system to
the regeneration disable to prevent fire hazards due to highly heated exhaust gas during the after-
treatment devices regeneration. For details of the setting method, see “HANDLE Komatsu Diesel
Particulate Filter (KDPF) (3-122)”.

The aftertreatment devices regeneration pilot lamp lights up

during regeneration of the exhaust gas aftertreatment devices.
It goes out when the regeneration is completed.

AFTERTREATMENT DEVICES REGENERATION DISABLE PILOT LAMP

Aftertreatment devices regeneration disable pilot lamp lights up
when the post processing system is set not to be regenerated.
REMARK
Even if the aftertreatment devices regeneration is disabled,
when the manual stationary regeneration is necessary, KDPF
soot accumulation caution lamp lights up. If KDPF soot accu-
mulation caution lamp lights up, cancel the regeneration disa-
ble setting and perform manual stationary regeneration.
For the procedures of cancellation of the regeneration disable
setting, and setting of manual stationary regeneration, see
“HANDLE Komatsu Diesel Particulate Filter (KDPF) (3-122)”.

LOCK LEVER PILOT LAMP

The lock lever pilot lamp lights up when the lock lever is in LOCK position.
It goes out when the lock lever is set in FREE position.

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EXPLANATION OF COMPONENTS OPERATION

ECO GUIDANCE
The guidance for energy saving operation to reduce the fuel
consumption may be displayed during operation.
The details of the guidance are as follows:

Idling Stop Guidance

If no operation is performed for more than 5 minutes, and the
engine is idling, the idling stop message is displayed on the
monitor. When waiting for work or taking short break, stop the
engine to reduce unnecessary fuel consumption.
The idling stop message goes out if any lever is operated again
or switch F5 is pressed.

Guidance To Avoid Hydraulic Relief

If the hydraulic oil is kept relieved for more than 3 seconds dur-
ing operation, the hydraulic relief deterrence message is dis-
played on the monitor.
The hydraulic relief deterrence message goes out 10 seconds
later or when switch F5 is pressed.

E Mode Recommendation Guidance

If light-load work is continued for more than 10 minutes in P or
ATT/P mode, E mode recommendation message is displayed.
When working on light load, set the working mode to E to re-
duce unnecessary fuel consumption.
E mode recommendation message goes out more than 10 sec-
onds after or when switch F5 is pressed.

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OPERATION EXPLANATION OF COMPONENTS

Reduce Travel Speed (Recommended) Guidance

If the machine keeps traveling for more than 2 minutes with the
travel mode Hi and the fuel control dial at the High idle (MAX)
position, the travel partial mode recommendation message is
displayed. When traveling for a long time, the fuel consumption
can be reduced by lowering the fuel control dial.
The travel partial mode recommendation message goes out
more than 10 seconds after or when switch F5 is pressed.

Low Fuel Level Guidance

If the operable time estimated from the current fuel level and
the latest average fuel consumption is shorter than 8 hours, the
low fuel level message is displayed.
The low fuel level message goes out more than 10 seconds af-
ter or when switch F5 is pressed.

Engine stop operation during the aftertreatment devices regeneration guidance

Immediately after starting the aftertreatment devices regeneration, the information about engine stop operation
during the aftertreatment devices regeneration is displayed.
When stopping the engine during the aftertreatment devices re-
generation, stop the regeneration first according to “PROCE-
DURE FOR AFTERTREATMENT DEVICES REGENERATION
DISABLE SETTING (3-129)”, then stop the engine after run-
ning it at low idle for approximately 5 minutes.
The information about engine stop operation during the after-
treatment devices regeneration goes out 10 seconds later or
when switch F5 is pressed.

DEF low level guidance

If the operable time estimated from the current DEF level and
the latest average DEF consumption is shorter than 8 hours,
the low DEF level message is displayed.
The low DEF level message goes out more than 10 seconds
after or when switch F5 is pressed.

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EXPLANATION OF COMPONENTS OPERATION

METER DISPLAY
ENGINE COOLANT TEMPERATURE GAUGE
Engine coolant temperature gauge shows the engine coolant
temperature.
If the indicator is in green range during operations, it is normal.
When the indicator goes beyond (A) of red range during opera-
tions, the overheat prevention system is actuated.
(A) to (B): Red range
(A) to (C): Green range
(C) to (D): White range
The overheat prevention system is actuated as follows.
Red range (A) position: Engine coolant temperature caution
lamp (E) shows abnormality display.
Red range (B) position: Engine speed changes to low idle, engine coolant temperature caution lamp (E) shows
abnormality display and alarm buzzer sounds at the same time
The overheat prevention system continues to operate until the indicator enters the green range.
When the engine is started, if the indicator is at position (D), engine coolant temperature caution lamp (E) shows
the low-temperature display.
In this case, perform warm-up operation. For details, see “METHOD FOR ENGINE WARM-UP OPERATION
(3-188)”.
Display (G) when temperature is low: Caution lamp background
(K) is white.
Display (H) when temperature is proper: Caution lamp back-
ground (K) is blue.
Display (J) when temperature is abnormal: Caution lamp back-
ground (K) is red.

HYDRAULIC OIL TEMPERATURE GAUGE

Hydraulic oil temperature gauge shows the hydraulic oil tem-
perature.
If the indicator is in green range during operations, it is normal.
When the indicator nears the red range (A) during operation,
the hydraulic oil temperature has exceeded 102 °C {216 °F} .
Run the engine at low idle or stop it and wait for the oil temper-
ature to drop.
(A) to (B): Red range
(A) to (C): Green range
(C) to (D): White range

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OPERATION EXPLANATION OF COMPONENTS

REMARK
When the indicator reaches red range (A), the hydraulic oil temperature is as follows.
Red range (A) position: 102 °C {216 °F}  or more
Red range (B) position: 105 °C {221 °F}  or more
When the indicator is in red range (A) to (B), hydraulic oil temperature caution lamp (E) indicates abnormality.
When the engine is started, if the indicator is at position (C), the hydraulic oil temperature is below 20 °C {68 °F} 
and hydraulic oil temperature caution lamp (E) indicates low temperature. In this case, perform warm-up opera-
tion. For details, see “METHOD FOR HYDRAULIC SYSTEM WARM-UP OPERATION (3-191)”.
Display (G) when temperature is low: Caution lamp background
(K) is white.
Display (H) when temperature is proper: Caution lamp back-
ground (K) is blue.
Display (J) when temperature is abnormal: Caution lamp back-
ground (K) is red.

FUEL GAUGE
Fuel gauge shows the amount of fuel in the fuel tank.
The indicator should be in the green range during operations.
When the indicator nears red range (A) during operation, the
remaining fuel is 114 ℓ {30.1 U.S.Gal}  or less, so check the fuel
level and add it.
(A) to (B): Red range
(A) to (C): Green range
REMARK
When the indicator reaches red range (B), the remaining fuel is
76 ℓ {20.1 U.S.Gal}  or less.
When the indicator is in red range (B), fuel level monitor (D)
lights up in red.
The correct fuel level may not be displayed for a short time after the starting switch is turned to ON position, but
this is not abnormal.

SERVICE METER / CLOCK

The service meter/clock shows the total hours of operation of the machine or the present time.
When the engine is running, the service meter advances even when the machine is not moving. The service
meter advances 0.1 every 6 operation minutes, regardless of the engine speed.
• Service meter display

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EXPLANATION OF COMPONENTS OPERATION

• Clock display (12-hour display)

• Clock display (24-hour display)

On the standard screen, when function switch F4 is pressed, it

is possible to switch between the clock display and the service
meter display alternately.
REMARK
• If the battery is disconnected for a long period for storage
etc., the time information may be lost.
• Clock display (12-hour or 24-hour display is available)
• For details of setting and correction of time, see “CLOCK
ADJUSTMENT (3-86)”.

ECO GAUGE
ECO gauge shows the instantaneous fuel consumption.
The instantaneous fuel consumption means the fuel consump-
tion rate at each moment, which varies with the work load and
engine speed.
When the gauge is in green range A, the instantaneous fuel
consumption is at Good to Medium level.
When the gauge is in yellow range B, the instantaneous fuel
consumption is at a bad level.
REMARK
Although there is no abnormality on the machine when the
gauge enters the yellow range, for the conservation of global
environment reduce the engine output to a point where there is
no adverse effect on the operation. Perform energy saving op-
erations within the green range. Travel less frequently. It also
helps energy saving operations. Consider the best way of oper-
ation for energy saving.

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OPERATION EXPLANATION OF COMPONENTS

FUEL CONSUMPTION GAUGE

Fuel consumption gauge shows the average fuel consumption
of the machine.
(A): Shows the average fuel consumption of a day (from 0:00
a.m. of the day to 0:00 a.m. of the next day).
(B): Shows the split fuel consumption under measurement.
(C): Shows the split fuel consumption while measurement is
stopped.
REMARK
Display on the fuel consumption gauge can be switched be-
tween the average fuel consumption per day and the average
fuel consumption during a selected period (split fuel consump-
tion).
For the procedure for switching the display, see “ENERGY
SAVING GUIDANCE (3-63)”.

DEF LEVEL GAUGE

DEF level gauge indicates the remaining level of DEF.
If the indicator is in green range during operations, it is normal.
If the indicator comes close to (A) of red range during opera-
tion, check and add DEF.
(A) to (B): Red range
(A) to (C): Green range
When the indicator is in red range from (A) to (B), DEF level
caution lamp (1) lights up in red.
If DEF level further decreases after the monitor lights up in red,
the engine power is derated. For detail, see “HANDLE UREA
SCR SYSTEM WARNING (3-134)”.
When remaining level of DEF cannot be detected, DEF level caution lamp (1) lights up in white.
REMARK
• Immediately after turning the starting switch to ON position and during the engine is running, DEF level cau-
tion lamp (1) lights up in white. However, this does not indicate abnormality.
• In cold weather, DEF level cannot be detected and DEF level caution lamp (1) lights up in white for approxi-
mately 1 hour. However, this does not indicate abnormality.
• Even if DEF level caution lamp (1) is not lit in white, it may take a long time for DEF level gauge to display
the correct position.
Note that the following cases are not abnormal:
• When DEF is added while the starting switch is kept at ON position.
• When the starting switch is turned to ON position immediately after adding DEF (within approximately
30 seconds).
Before adding DEF, turn the starting switch to OFF position. Wait for a while after adding, then turn the
starting switch to ON position.

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EXPLANATION OF COMPONENTS OPERATION

MONITOR SWITCHES

(1) Function switch (5) Wiper switch

(2) Working mode selector switch (6) Window washer switch
(3) Auto-deceleration switch (7) Buzzer cancel switch
(4) Travel speed selector switch (8) Air conditioner switch

FUNCTION SWITCHES AND GUIDANCE ICONS

• There are 6 function switches (1) (F1 to F6) at the bottom
of the monitor display. The function of each switch differs
according to the content of each screen.
• On each screen, you can confirm the function of switches
(1) by guidance icons (2) displayed on top of the switch.
• While guidance icon (2) is not displayed, function switch
(1) does not function even if it is pressed.
• Even if guidance icon (2) is pressed, it does not function.
Press function switch (1) directly under guidance icon (2)
to operate the function.
When the monitor display shows the standard screen, the
types of guidance icons and functions of function switches are
as follows:
For the details of each function, see the detailed explanation of
each item.

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OPERATION EXPLANATION OF COMPONENTS

(A) Switch F3: Camera image selector switch.

(B) Switch F4: Service meter/clock display selector switch

(C) Switch F5: Current Abnormality display switch

(Only while caution lamp is lit)

(D) Switch F5: ECO guidance erase switch

(While ECO guidance is displayed)
(E) Switch F6: User menu display switch
Guidance icons and their functions differ with the contents of
the displayed screen, but representative guidance icons fre-
quently used and their functions are as follows:

(F) Switch F1: Moves to the left item. (When on the left end, it
moves to the right end.)
(G) Switch F2: Moves to the right item. (When on the right end,
it moves to the left end.)

(H) Switch F3: Moves to the item below (forward). (When on

the last line, it moves to the first line on the next page.)
(I) Switch F4: Moves to the item above (backward). (When on
the first line, it moves to the last line on the previous page.)

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EXPLANATION OF COMPONENTS OPERATION

(J) Switch F5: Cancels any change and returns the screen to
the previous screen.
(K) Switch F6: Enters the selection and contents to change,
and proceeds the screen to the next screen.
REMARK
• Even if some icons look the same, their display positions
and corresponding function switches may differ according
to the screens to be displayed.
• For the guidance icons and their functions not explained
above, see the pages where the control methods of re-
spective screens are explained.

WORKING MODE SELECTOR SWITCH

Use working mode selector switch (1) to set the movement or
power of the work equipment.
The operation becomes easier by selecting the mode to match
the content of the operation.
P mode: For heavy-duty operations
E mode: For operations with emphasis on fuel consumption
L mode: For fine control operations
B mode: For breaker operations
ATT/P mode: For operations of 2-way attachments like crusher
(machines ready for installation of attachment)
ATT/E mode: For operations emphasizing fuel consumption out
of those of 2-way attachments like crusher (machines ready
for installation of attachment)
• When the monitor is turned ON, it is automatically set to
the mode used when the starting switch was turned to
OFF position last.
• Press the switch to display the working mode selection
screen (2). For each set mode, P, E, L, B, ATT/P, ATT/E
are displayed at the top right of the monitor display.
• For machines ready for installation of attachment, the attachment mode is added to the display.
For handling of machines ready for installation of attachment, see “ATTACHMENTS AND OPTIONS
(6-1)”.
• When the monitor starts up, if the working mode setting is
B mode, the confirmation message in the figure is dis-
played and the buzzer sounds.
• When starting up and staying in B mode, always press
function switch F6.
If you press F5, the system starts up in E mode.
If you want to have automatic setting of P, E, L, B, ATT/P or
ATT/E mode (optional default setting) when starting engine ,
ask your Komatsu distributor to change the setting.

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OPERATION EXPLANATION OF COMPONENTS

How to use working mode selector switch

1. When working mode selector switch (1) is pressed, the
Working Mode selector screen is displayed on the monitor.

2. Press function switches F3 or F4 at the bottom of the screen or working mode selector switch (1) to change
the mode selection one at a time.
If no switch is touched for more than 5 seconds, the selected working mode is automatically set as the
working mode and the screen changes to the one for steps 3 and 4.
REMARK
To return to the standard screen without changing the
working mode, press function switch F5.

3. After selecting the desired mode, press function switch F6

and the mode is displayed in the center of the monitor dis-
play.
(Example: When the power mode is selected: P)
4. After 2 seconds, the working mode display at the top right
of the screen is highlighted in yellow.

5. After 2 seconds, the screen returns to the standard screen.

The working mode display highlighted in yellow in step 4
returns to blue.

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EXPLANATION OF COMPONENTS OPERATION

REMARK
When setting the working mode to B mode, to ensure safe-
ty, the buzzer sounds and at the same time, the message
in the illustration is displayed. When setting to the breaker
mode, always press function switch F6.
When function switch F5 is pressed, the breaker mode is
not set, and the screen returns to working mode selection
screen.

AUTO-DECELERATION SWITCH
Auto-deceleration switch automatically lowers the engine
speed and turns on the function to reduce fuel consumption
when the control levers are at NEUTRAL position.
Auto-deceleration pilot lamp lights up: Auto-deceleration ON
Auto-deceleration pilot lamp goes off: Auto-deceleration OFF
Each time the switch is pressed, the auto-deceleration is
switched between ON and OFF.

Function of auto-deceleration
When the auto-deceleration function is ON, if the work equipment lever and travel lever are returned to NEU-
TRAL position, the engine speed will drop approximately after 4 seconds from the operating speed to idle
speed.
As a result, fuel consumption can be reduced.
If any lever is operated in this condition, engine speed will return to the previous operating speed, and you can
perform the operation.
1. When the auto-deceleration switch is pressed and the au-
to-deceleration function is turned ON, the mode is dis-
played in the center of the monitor display, and after 2 sec-
onds, the screen returns to the standard screen.

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OPERATION EXPLANATION OF COMPONENTS

2. On the standard screen, auto-deceleration pilot lamp lights

up.
(When the auto-deceleration is OFF, the indication lamp
goes out.)

TRAVEL SPEED SELECTOR SWITCH

k WARNING
• When loading to or unloading from a trailer, always drive the machine at low speed (set the travel
speed selector switch to Lo) and never operate the travel speed selector switch during travel.
• If the travel speed is switched between Hi and Lo when the machine is traveling, the machine may
deviate to one side, even when traveling in a straight line. Stop the machine before switching the
travel speed.

Travel speed selector switch is used to select the travel speed

from 3 stages.
Lo lights up: Low-speed travel
Mi lights up: Mid-range speed travel
Hi lights up: High-speed travel
When the engine is started, the speed is automatically set to
Lo.
Each time that the switch is pressed, the display changes Lo →
Mi → Hi → Lo in turn.
Even if the travel speed is set to high-speed (Hi) or a mid-range
speed (Mi), when traveling on soft ground or uphill, and travel
power is needed, the system automatically shifts down to low
speed travel (Lo). There is no need to operate the switch. In
this case, the travel speed on the monitor display stays lit at Hi
(high-speed) or Mi (mid-range speed).

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EXPLANATION OF COMPONENTS OPERATION

REMARK
Each time the travel speed selector switch is switched, the
mode is displayed on the monitor display, and after 2 seconds,
the screen returns to the standard screen.

WIPER SWITCH
Wiper switch actuates the front window windshield wiper.
Each time the switch is pressed, it changes INT → ON → stop
(monitor goes out).
Windshield wiper pilot lamp INT lights up: Windshield wiper op-
erates intermittently
Windshield wiper pilot lamp ON lights up: Windshield wiper op-
erates continuously
Windshield wiper pilot lamp off: Windshield wiper stops

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OPERATION EXPLANATION OF COMPONENTS

REMARK
Each time wiper switch is pressed, the mode is displayed in the
center of the monitor display, and after 2 seconds, the screen
returns to the standard screen.

WINDOW WASHER SWITCH

Keep pressing this switch continuously, and window washer flu-
id is sprayed out on the front glass. When releasing the switch,
the spray stops.
• If keep pressing the switch when the wiper is stopped, the
window washer fluid is sprayed out. At the same time, the
wiper is actuated continuously. When releasing switch, the
wiper continues to operate for 2 cycles, then stops.
• If the wiper is moving intermittently and the switch is kept
pressed continuously, the window washer fluid is sprayed
out. At the same time, the wiper is actuated continuously.
When releasing switch, the wiper continues to operate for
2 cycles, then return to intermittent operation.

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EXPLANATION OF COMPONENTS OPERATION

BUZZER CANCEL SWITCH

Buzzer cancel switch is used to stop the alarm buzzer for the warning item where there is an abnormality.
REMARK
The buzzer cannot be stopped according to the content of the
warning.

AIR CONDITIONER SWITCH

The air conditioner switch consists of 9 switches.
For explanation of each switch, see "HANDLE AIR CONDI-
TIONER (3-230)".

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OPERATION EXPLANATION OF COMPONENTS

FUNCTION SWITCHES
The operation of the function switches in the standard screen

CAMERA IMAGE SELECTOR SWITCH

On the standard screen, you can select a display only for the
camera image or a display only for the meter by pressing
switch F3.
On machines not equipped with a camera, the guidance icon
related to switch F3 is not displayed. Even if switch F3 is press-
ed, the screen will not switch to the camera image display.
A maximum of 3 cameras can be installed. If you want to install
another camera, consult your Komatsu distributor.

Operation of camera image display screen

Operate the following for changing the camera image display on the monitor.

• On standard screen LL, the camera image is always displayed on the left part of the monitor.
• On standard screen LL, when switch F3 is pressed, camera image full-screen display MM is displayed.
Camera image full-screen display MM is displayed on the entire screen.
• When switch F3 is pressed on camera image full-screen display MM, message screen NN is displayed and
no camera image is displayed.
• On message screen NN, when switch F3 is pressed or when no switch is operated for 10 seconds, stand-
ard screen LL is displayed.
• On message screen NN, when switch F5 is pressed, the message disappears and meter display screen AA
is displayed.

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EXPLANATION OF COMPONENTS OPERATION

Operation of one camera image display screen

Operate the following for the method of operation when it is desired to display only one camera image on the
monitor.
• On the standard screen, when switch F3 is pressed, No. 1
camera image is displayed in full-screen.

• Display of camera image is changed each time switch F1

is pressed.
1. No. 1 camera image is displayed in full-screen.
2. No. 2 camera image is displayed in full-screen.
3. No. 3 camera image is displayed in full-screen.
4. No. 1 and No. 2 camera images are displayed simulta-
neously.
• When switch F1 is pressed on the screen that displays No.
1 and No. 2 camera images simultaneously, it returns to
the screen that displays No.1 camera image in full-screen.
REMARK
If the machine is equipped with No.1 camera only, No. 2 camera image to No.4 camera image are not dis-
played. No.1 camera image only is displayed in full-screen. If the machine is not equipped with No.3 camera,
display is changed each time switch F1 is pressed, but No.3 camera image is not displayed.
• Press switch F3, and the screen returns to the standard
screen.

Operation of image display screen when two camera images are shown simulta-
neously
• Even if No.1 through No. 3 cameras are installed, only the
images from the No. 1 camera (d) and the No. 2 camera
(e) can be displayed simultaneously.
• When two images are displayed simultaneously, the dis-
play changes more slowly than when only one image is
displayed.

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OPERATION EXPLANATION OF COMPONENTS

• Press switch F3, and the screen returns to the standard

screen.

Other mode operations while camera image is displayed

Even during the camera image is displayed, it is possible to op-
erate following modes.
• The air conditioner can be operated.
When the air conditioner switch is operated, the screen
switches to the air conditioner control screen. When the
screen switches to the air conditioner operation screen,
press switch F6 to return the screen to the camera image.
In addition, if no operation is performed for 5 seconds after
the screen switches to the air conditioner operation
screen, the screen automatically returns to the camera im-
age display.
For details of the air conditioner operation, see “HANDLE
AIR CONDITIONER (3-230)”.

• Press the working mode selector switch to change the

working mode.
For the working mode selector switch, see “WORKING
MODE SELECTOR SWITCH (3-48)”.
When the working mode is changed, the screen returns
automatically to the camera image screen. At this time, the
working mode display at the top right of the monitor display
is highlighted in yellow for 2 seconds, then returns to blue.

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EXPLANATION OF COMPONENTS OPERATION

• Press the travel speed selector switch to change the travel

speed.
For the travel speed selector switch, see “TRAVEL SPEED
SELECTOR SWITCH (3-51)”.
When the travel speed is changed, the travel speed dis-
play at the top right of the monitor display is highlighted in
yellow for 2 seconds, then returns to blue.

• Press the auto-deceleration switch to turn the auto-decel-

eration function ON/OFF.
Even if the auto-deceleration switch is pressed, the cam-
era image display does not switch to another screen or re-
turn to the standard screen.

• Press the buzzer cancel switch to stop the alarm buzzer

for the abnormality of warning item.
Even if the buzzer cancel switch is pressed, the camera
image display does not switch to another screen or return
to the standard screen.
Depending on the warning, alarm buzzer does not stop
sounding by pressing the buzzer cancel switch.

• Press the wiper switch and washer switch to operate the

wipers and washer.
Even if the wiper switch or washer switch is pressed, the
camera image display does not switch to another screen
or return to the standard screen.

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OPERATION EXPLANATION OF COMPONENTS

Actions against warning during camera image display

• If any abnormality is generated on the machine while the
camera image is displayed, the caution lamp flashes at the
top left of the screen.

• If the caution lamp is displayed, press switch F6 to return

to the standard screen, and check the content of the ab-
normality or warning display.
While the caution lamp is flashing, if no lever is operated
for 10 seconds or more, the screen automatically returns
to the standard screen.

When the screen returns to the standard screen, the cau-

tion lamp at the top left of the screen goes out and the
caution lamp and action level are displayed on the center
of the screen.
• If a caution lamp is displayed, move the machine to set it
in a safe posture, then have inspection performed immedi-
ately.
• For the contents of the warning display, see “WARNING
DISPLAY (3-19)” and “TROUBLES AND ACTIONS
(3-271)”.

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EXPLANATION OF COMPONENTS OPERATION

USER MENU DISPLAY SWITCH

On the standard screen, press switch F6 to display the user
menu screen on which you can make various settings for the
machine in the monitor display.

USER MENU
The user menu consists of the following kinds. Press switches
F1 and F2 to move to right and left for selecting menu screens.
(a): Energy Saving Guidance
(b): Machine Settings
(c): Aftertreatment Devices Regeneration
(d): SCR Information
(e): Maintenance
(f): Monitor Setting
(g): Mail Check
These menus (a) to (g) are for setting and confirming the fol-
lowing items:
For operations in each menu, see the detailed explanation pa-
ges of respective items.

(a) Energy Saving Guidance

• Check of Operation Records
• Check of ECO Guidance Records
• Check and reset of Average Fuel Consumption Record
• Configurations

(b) Machine Setting

• Economy Mode Adjustment
• Breaker Setting (if equipped)
• Attachment Setting (if equipped)
• Fan Reverse
• Auto Idle Stop Timer Setting

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OPERATION EXPLANATION OF COMPONENTS

(c) Aftertreatment Devices Regeneration

• Setting for Regeneration Disable
• Operation of Manual Stationary Regeneration

(d) SCR Information

• Check of DEF level
• Urea SCR system information

(e) Maintenance
• Check and reset of various Maintenance Times

(f) Monitor Setting

• Screen Adjustment
• Screen Adjustment (camera)
• Clock Adjustment
• Language Setting
• Operator ID

(g) Mail Check

• Check of mail contents and reply to mail

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EXPLANATION OF COMPONENTS OPERATION

On the user menu screen, it is possible to perform the following

operations with switches F1 to F6.

F1: Moves to the left menu. When on the left end menu, it
moves to the right end menu.
F2: Moves to the right menu. When on the right end menu, it
moves to the left end menu.

F3: Moves to the next item (1 line below). When on the last
line, it moves to the first line on the next page.
F4: Moves to the previous item (1 line above). When on the
first line, it moves to the last line on the previous page.

F5: Returns to the standard screen.

F6: Displays the setting screen for selected item.
• If no switch is operated for 30 seconds on the user menu
screen, the screen automatically returns to the previous
screen.

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OPERATION EXPLANATION OF COMPONENTS

ENERGY SAVING GUIDANCE

Each item of “Energy Saving Guidance” menu (a) is used for
displaying and setting the notification relevant to energy saving.
• “Operation Records”
• “Eco Guidance Records”
• “Average Fuel Consumption Record”
• “Configurations”

CHECK OPERATING RECORD

Select the Operation Records (1) from the Energy Saving Guid-
ance menu screen, then press switch F6.
On the Operation Records menu, the working hours, Average
Fuel Consumption, Actual working hours, Ave. Fuel Consump-
tion (Actual Working), Fuel Consumption, Idling Hours and E
mode time ratio on daily basis or on a split measurement peri-
od basis are displayed.

Operation on the Operation Records screen

On the Operation Records screen, you can perform the follow-
ing operations by pressing switch F3 to F5.
F3: Displays the next page. When on the last page, it displays
the first page.
F4: Displays the previous page. When on the first page, it dis-
plays the last page.
F5: Returns the screen to the Energy Saving Guidance menu
screen.

CHECK ECO GUIDANCE RECORD

Select the ECO Guidance Records (2) on the Energy Saving
Guidance menu screen, then press switch F6.
On the ECO Guidance Records menu, display the frequency of
display of the ECO guidance on a daily basis or during the split
measurement period.

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EXPLANATION OF COMPONENTS OPERATION

Operations on ECO Guidance Records screen

Press switch F5 to perform the following operation on the ECO
Guidance Records screen.
F5: Returns the screen to the Energy Saving Guidance menu
screen.

REMARK
ECO guidance denotes displaying the guidance for energy sav-
ing operation. This display may appear on the standard screen
while the machine is in operation.
For details, see “ECO GUIDANCE (3-40)”.

CHECK FUEL CONSUMPTION RECORD

Select the Average Fuel Consumption Record (3) from the En-
ergy Saving Guidance menu screen, then press switch F6.
On the Average Fuel Consumption Record menu, display the
graph of hourly average fuel consumption during the last 12
hours or the graph of daily fuel consumption during the last 1
week.

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Operation on the Average Fuel Consumption Record screen

Press switch F1, F2 or F5 on the Average Fuel Consumption
Record screen to perform the following operations.
F1: Clears the graph data.
F2: Switches graphical displays of the average fuel consump-
tion.
F5: Returns the screen to the Energy Saving Guidance menu
screen.
REMARK
The displayed value of fuel consumption may differ from the
actual value due to the operating conditions of the customers
(fuel, weather or work contents, etc.).

Switching of displayed graph

Press F2 on the Average Fuel Consumption Record screen to
change the currently displayed graph to another.
REMARK
There are 2 types of graphs. One shows hourly average fuel
consumption during the last 12 hours and the other is daily
average fuel consumption during the last 1 week. Switching be-
tween them is available.

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EXPLANATION OF COMPONENTS OPERATION

Deleting the average fuel consumption records

1. When switch F1 (CLEAR) is pressed, the reconfirmation
screen shown in the figure is displayed.
2. When the switch F6 is pressed, graphs of data of the last
12 hours and the last 1 week are both deleted, and the
screen returns to the Average Fuel Consumption Record
screen.
REMARK
Press switch F5 to cancel the data deletion (clear) operation.

CHANGE DISPLAY SETTING

Select Configurations (4) from the Energy Saving Guidance
menu screen, then press switch F6.
On the Configurations menu, following operations are availa-
ble.
• Setting the Average Fuel Consumption Display
• Switching ON/OFF of the ECO Gauge Display
• Setting the ECO Gauge Display Fuel Target Value
• Switching ON/OFF of the ECO Guidance Display
• Switching ON/OFF of the ECO Guidance Display at Key
OFF

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OPERATION EXPLANATION OF COMPONENTS

Operations on the Configurations screen

Press switches F3 to F5 to perform the following operations on
the Configurations screen.
F3: Moves to the next item (1 line below). When on the last
line, it moves to the first line.
F4: Moves to the previous item (1 line above). When on the
first line, it moves to the last line.
F5: Returns the screen to the Energy Saving Guidance menu
screen.
F6: Displays the setting screen for selected item.

SET DISPLAY OF FUEL CONSUMPTION GAUGE

It is possible to change the display of fuel consumption gauge
(5) and the setting of Display/Non-display.

1. Select Average Fuel Consumption Display (6) from the

Configurations screen, then press switch F6.
On this screen, it is possible to perform the following oper-
ations with switches F3 to F6.
F3: Moves to the next item (1 line below). When on the last
line, it moves to the first line on the next page.
F4: Moves to the previous item (1 line above). When on
the first line, it moves to the last line on the previous
page.
F5: Cancels the setting and returns to Configurations
screen.
F6: Changes the setting and returns to Configurations screen.
2. The Average Fuel Consumption Display screen appears.
• 1 Day
Displays the average fuel consumption from 0:00 a.m.
of the day to 0:00 a.m. of the next day.
• Split Time
Displays the average fuel consumption during the split
measurement period.
Select the split to start the automatic measurement of
fuel consumption.
• None
Does not display the fuel consumption gauge.

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REMARK
When you select the split measurement, the measurement stop
switch (STOP) is displayed on the Operation Records screen
and the ECO Guidance Records screen.
When you stop the measurement, move from Energy Saving
Guidance menu (a) screen to the Operation Records (1) screen
or ECO Guidance Records (2) screen, then press the measure-
ment stop switch F1 (STOP).

SWITCH DISPLAY/NON-DISPLAY OF ECO GAUGE

It is possible to change the setting of Display/Non-display of
ECO gauge (7).

1. Select the ECO Gauge display (8) from the Configurations

screen, then press switch F6.
2. ECO Gauge Display setting screen appears.
ON: Displays the ECO gauge (7) on the standard screen.
OFF: Does not display ECO gauge (7) on the standard
screen.

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On the Configurations screen, it is possible to perform the fol-

lowing operations with switches F3 to F6.
F3: Moves to the next item (1 line below). When on the last
line, it moves to the first line on the next page.
F4: Moves to the previous item (1 line above). When on the
first line, it moves to the last line on the previous page.
F5: Cancels the setting change and returns to Configurations
screen.
F6: Changes the setting and returns to Configurations screen.

SET TARGET FUEL CONSUMPTION VALUE DISPLAYED IN ECO GAUGE

It is possible to change the target fuel consumption value (the upper limit value of the green range) of the ECO
gauge .
1. Select the target fuel consumption value displayed in the
ECO Gauge Target Value (9) from the Configurations
screen, then press switch F6.

2. ECO Gauge Display Fuel Target Value appears.

On this screen, it is possible to perform the following oper-
ations with switches F3 to F6.
F3: Decreases the target fuel consumption value by 1 ℓ/h.
F4: Increases the target fuel consumption value by 1 ℓ/h.
F5: Cancels the setting and returns to Configurations
screen.
F6: Changes the setting and returns to Configurations
screen.

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EXPLANATION OF COMPONENTS OPERATION

SWITCH DISPLAY/NON-DISPLAY OF ECO GUIDANCE

It is possible to change the setting of Display/Non-display of
ECO guidance (10).

1. Select ECO Guidance display (11) from the Configurations

screen, then press switch F6.

2. ECO Guidance Display setting screen appears.

ON: Displays ECO Guidance (10) on the standard screen.
OFF: Does not display ECO Guidance (10) on the stand-
ard screen.

On this screen, it is possible to perform the following operations

with switches F3 to F6.
F3: Moves to the next item (1 line below). When on the last
line, it moves to the first line on the next page.
F4: Moves to the previous item (1 line above). When on the
first line, it moves to the last line on the previous page.
F5: Cancels the setting change and returns to Configurations
screen.
F6: Changes the setting and returns to Configurations screen.

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SWITCH DISPLAY/NON-DISPLAY OF GUIDANCE WHEN KEY IS OFF

It is possible to change the setting of Display/Non-display of
guidance (12) when the starting key is turned off.

1. Select ECO Guidance at Key OFF (13) from the Configu-

rations screen, then press switch F6.

2. The setting screen for ECO Guidance Display at Key OFF

screen appears.
ON: Displays ECO Guidance (12) on the end screen.
OFF: Does not display ECO Guidance (12) on the end
screen.

On this screen, it is possible to perform the following operations

with switches F3 to F6.
F3: Moves to the next item (1 line below). When on the last
line, it moves to the first line on the next page.
F4: Moves to the previous item (1 line above). When on the
first line, it moves to the last line on the previous page.
F5: Cancels the setting change and returns to Configurations
screen.
F6: Changes the setting and returns to Configurations screen.

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MACHINE SETTINGS
Each item of Machine Setting menu (b) is used for setting items
of machine.
• Economy Mode Adjustment
• Breaker Setting
• Attachment Setting
• Hydraulic Fan Reverse
• Auto Idle Stop Timer Setting

ADJUST ECONOMY MODE

Select the “Economy Mode Adjustment” (1) on the “Machine
Setting (b)” menu screen, then press switch F6.

On the “Economy Mode Adjustment ”menu, you can adjust the

engine output in E mode.
In the economy mode, the higher the selected number starting
from E0 becomes, the lower the engine output becomes. In the
meantime, the better the fuel efficiency becomes.

Operation on the economy mode adjustment screen

On the economy mode adjustment screen, it is possible to per-
form the following operations with switches F3 to F6.
F3: Moves to the next item (1 line below). When on the last
line, it moves to the first line.
F4: Moves to the previous item (1 line above). When on the
first line, it moves to the last line.
F5: Cancels the selection and returns the screen to the “Ma-
chine Setting” menu screen.
F6: Selects the Adjustment Mode and returns the screen to
“Machine Setting” menu screen.

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BREAKER SETTING
On the “Breaker Setting” menu, you can change the name of breaker displayed on the monitor and the breaker
oil flow rate setting.
For machines that have no attachment, the “Breaker Setting” menu is not displayed.
1. Select “Breaker Setting” (2) on the “Machine Setting” menu
(b) screen, then press switch F6.

2. On the “Breaker Setting” screen shown in the figure, select

breaker and press switch F6.
On the “Breaker Setting” screen shown in the figure, you
can perform the following operations with switches F1 to
F6.
F1: Changes the name of the selected breaker setting.
F2: Changes the oil flow rate of the selected breaker set-
ting.
F3: Moves to the next item (1 line below). When on the last
line, it moves to the first line.
F4: Moves to the previous item (1 line above). When on the first line, it moves to the last line.
F5: Cancels the selection and returns the screen to the “Machine Setting” menu screen.
F6: Allocates the selected setting to the setting when B mode is selected.
Changing the “Breaker Setting” name
You can change the breaker setting name as you like.
You can use alphabet letters A to Z, Arabic numerals 0 to 9, symbols #, *, +, -, and /, and the space.
1. On the “Breaker Setting” screen, select a setting to change
its name, then press switch F6.

2. The “Breaker Name Setting” screen is displayed.

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EXPLANATION OF COMPONENTS OPERATION

On the “Breaker Name Setting” screen, you can perform

the following operations with switches F1 to F6.
F1: “CLEAR” Clears all the letters. (If some letters are left.)
F1: “DEFAULT” Displays the initial name. (If all the letters
are deleted.)
F2: Moves to the right letter.
F3: Moves to the next alphabet, numeral, or symbol.
F4: Moves to the previous alphabet, numeral, or symbol.
F5: Returns the screen to the “Breaker Setting” screen
without changing the name.
F6: Enters the change and returns the screen to the “Breaker Setting” screen.
Changing “Breaker Oil Flow Rate Setting”
1. On the “Breaker Setting” screen, select a setting to change
its oil flow rate, then press switch F2.

2. The “Breaker Oil Flow Rate Setting” screen is displayed.

On the “Breaker Oil Flow Rate Setting” screen, you can
perform the following operations with switches F3 to F6.
F3: Decreases the oil flow rate by 1 level.
F4: Increases the oil flow rate by 1 level.
F5: Returns the screen to the “Breaker Setting” screen
without changing the oil flow rate.
F6: Enters the oil flow rate setting and returns the screen
to the “Breaker Setting” screen.
(X): Present oil flow rate setting
(Y): Min. adjusted oil flow rate
(Z): Max. adjusted oil flow rate

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OPERATION EXPLANATION OF COMPONENTS

ATTACHMENT SETTING
On machines ready for installation of attachment, you can adjust the oil flow rate in ATT/P mode and ATT/E
mode to match the attachment on the “Attachment Setting” menu.
For machines that have no attachment, the “Attachment Setting” menu is not displayed.
1. Select “Attachment Setting” (3) on the “Machine Setting”
menu (b) screen, then press switch F6.

2. On the “Attachment Setting” screen shown in the figure,

select an attachment setting to adjust and press switch F6.
On “Attachment Setting” screen shown in the figure, you
can perform the following operations with switches F1 to
F6.
F1: Changes the name of the selected attachment setting.
F2: Changes the oil flow rate of the selected attachment
setting.
F3: Moves to the next item (1 line below). When on the last
line, it moves to the first line.
F4: Moves to the previous item (1 line above). When on the first line, it moves to the last line.
F5: Cancels the selection and returns the screen to the “Machine Setting” menu screen.
F6: Allocates the selected setting to that of ATT/P or ATT/E mode.
Changing “Attachment Setting” name
You can change the name for the attachment setting name as you like.
You can use alphabet letters A to Z, Arabic numerals 0 to 9, symbols #, *, +, -, and /, and the space.
1. Select a setting to change on the “Attachment Setting”
screen, then press switch F6.

2. The “Attachment Name Setting” screen is displayed.

On the “Attachment Name Setting” screen, you can per-
form the following operations with switches F1 to F6.
F1: “CLEAR” Clears all the letters. (If some letters are left.)
F1: “DEFAULT” Displays the initial name. (If all the letters
are deleted.)
F2: Moves to the right letter.
F3: Moves to the next alphabet, numeral, or symbol.
F4: Moves to the previous alphabet, numeral, or symbol.

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EXPLANATION OF COMPONENTS OPERATION

F5: Returns to the attachment setting screen without changing the name.
F6: Enters the change and returns to the attachment setting screen.
It is not possible to change the name for "No Attachment" setting.
Changing “2-Way Attachment Oil Flow Rate Setting”
1. Select an attachment setting to change its oil flow rate on
the “Attachment Setting” screen, then press switch F2.

2. The “2-Way Attachment Oil Flow Rate Setting” screen is

displayed.
On the “2-Way Attachment Oil Flow Rate Setting” screen,
you can perform the following operations with switches F3
to F6.
F3: Decreases the oil flow rate by 1 level.
F4: Increases the oil flow rate by 1 level.
F5: Returns to the “Attachment Setting” screen without
changing the oil flow rate.
F6: Enters the oil flow rate setting and returns to the “At-
tachment Setting” screen.
(X): Present oil flow rate setting
(Y): Min. adjusted oil flow rate
(Z): Max. adjusted oil flow rate
It is not possible to change the oil flow rate for “No Attachment” setting.

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REVERSE HYDRAULIC FAN

The hydraulic fan reverse mode (fan reverse rotation) can be used to remove insects and dirt sticking to the
radiator core by blowing air with the fan outward of the machine.
Before starting the hydraulic fan reverse, check that there is no combustible substance in the periphery which
may be sucked in the fan.
1. Set the lock lever securely to LOCK position (L).

2. On the standard screen, press switch F6.

3. Select “Fan Reverse” mode (4) on “Machine Setting” menu

(b) screen, then press switch F6.

4. When switch F6 is pressed in the screen shown in the fig-

ure, the fan rotation direction is reversed.
(If switch F5 is pressed, the screen returns to the previous
screen.)

5. When the screen shown in the figure is displayed, the engine speed is set to low idle automatically and the
fan starts rotating in reverse in approximately 15 seconds. Approximately 4 seconds after, the engine speed
returns to the level before reverse rotation.

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EXPLANATION OF COMPONENTS OPERATION

REMARK
• The fan speed is in proportion to the engine speed.
When the engine speed is at low idle, the fan speed
decreases, as well. To increase the fan speed, oper-
ate the fuel control dial to increase the engine speed.
• When reversing the fan rotation while the engine is
stopped, wait until this screen appears, and then turn
the starting switch to “START” position. This screen
does not change until the engine is started. To cancel
it, turn the starting switch to “OFF” position.
• If the aftertreatment devices regeneration pilot lamp or
the KDPF soot accumulation caution lamp lights up
while the fan is rotating in reverse, return the fan to
the normal rotation immediately and take necessary
actions according to “HANDLE Komatsu Diesel Partic-
ulate Filter (KDPF) (3-122)” until the aftertreatment de-
vices regeneration pilot lamp or the KDPF soot accu-
mulation caution lamp goes out.
After the lamps go out, you can reverse the fan rota-
tion.
6. When the fan rotates in reverse, the screen shown in the
figure is displayed automatically.
This screen is kept displayed while the fan is rotating in re-
verse.

NOTICE
If the fan rotation direction cannot be reversed, the
caution lamp lights up.
When the caution lamp lights up, take actions accord-
ing to “ACTION LEVEL DISPLAY (3-21)”.

7. To return the fan rotation direction from reverse to normal,

press switch F5 on the screen shown in the figure.

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OPERATION EXPLANATION OF COMPONENTS

8. Press switch F6 when the confirmation screen shown in

the figure is displayed.
(If switch F5 is pressed, the screen returns to the previous
screen.)

9. If the screen shown in the figure is displayed, the engine

speed is set to low idle automatically and the fan rotation
direction is returned to normal in approximately 15 sec-
onds. Approximately 4 seconds after, the engine speed re-
turns to the original level.

10. When the fan rotation direction returns to normal, the

standard screen is displayed automatically.

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EXPLANATION OF COMPONENTS OPERATION

REMARK
• In some cases, the screen in step 3 does not change to
that in step 4 and the screen shown in the figure is dis-
played and the fan does not rotate in reverse. This hap-
pens when the fan rotation is controlled not to be reversed
for the hydraulic oil temperature condition to protect the
components.
• To reverse the fan rotation, press switch F5 to return to the
standard screen. Then, run the engine at low idle to warm-
up.
• If background color of hydraulic oil temperature caution
lamp (1) is blue or red on the standard screen, the fan can
be rotated in reverse. Perform the procedure in order from
step 1.
• While the fan is rotating in reverse, the work equipment is
so controlled that it will move little even if it is operated.
The purpose of the fan reverse function is to clean the ra-
diator. When performing the actual work, including the
work equipment operation, set the fan rotation to the nor-
mal direction.
• If the fan rotation is reversed while KDPF system caution
lamp or KDPF soot accumulation caution lamp is lit, the
engine speed and fan speed may not increase even when
the fuel control dial is set to High idle (MAX) position, but
this is not a failure.
• In a cold circumstance, perform the cleaning by fan re-
verse rotation within less than 5 minutes. If reverse rota-
tion of the hydraulic fan is performed for a long time, DEF
hose may be frozen.

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AUTO IDLE STOP TIMER SETTING

The auto idle stop function stops the engine automatically when the engine is operated continuously at idle with
the lock lever in LOCK position for a set time.
The auto idle stop function operates only when the following conditions are satisfied.
• The engine is running normally.
• The lock lever is in LOCK position.
• The engine coolant and hydraulic oil are not overheating.
• The engine is not in warm-up operation.
• The machine is not in L mode.
You can set the time to operate the auto idle stop function on the Auto Idle Stop Timer Setting.
1. Select “Auto Idle Stop Timer Setting” (5) on the “Machine
Setting” menu (b) screen, and then press switch F6.

2. Select the set time on the “Auto Idle Stop Timer Setting”
screen shown in the figure, and then press switch F6.
On the “Auto Idle Stop Timer Setting” screen shown in the
figure, you can perform the following operations with
switches F3 to F6.
F3: Moves to the next item (1 line below). When on the last
line, it moves to the first line.
F4: Moves to the previous item (1 line above). When on
the first line, it moves to the last line.
F5: Cancels the selection and returns the screen to the
“Machine Setting” menu screen.
F6: Allocates the selected setting to that of the auto idle stop timer setting.
REMARK
• Selecting “OFF” disables operation of the auto idle stop function.
• You cannot select a time longer than that specified in the service menu.
3. When the idling time reaches 30 seconds before the set
time, the monitor returns to the standard screen and
changes to the countdown screen.
If you set the lock lever to FREE position, countdown stops
and the screen returns to the standard screen.

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EXPLANATION OF COMPONENTS OPERATION

4. When countdown reaches 0, the engine stops and the

screen changes to the “Auto Idle Stop in Operation”
screen.
5. To prevent battery discharging, turn off unnecessary
switches.
REMARK
While the auto idle stop is activated, only the engine is
stopped and the machine monitor, inverter, etc., as well as
the electrical components including the air conditioner, ra-
dio, lamps, and wipers keep their states before the engine
is stopped.
6. To prevent causing flat battery, turn the starting switch to OFF position.
7. When restarting the engine, turn the starting switch as usual.
REMARK
While the auto idle stop function is ON, the number of the times
that the engine was stopped when it was not at low idle is dis-
played as “L01” at and after 1000 and as “L03” at and after
2000 on the monitor.

AFTERTREATMENT DEVICES REGENERATION

Each item of “Aftertreatment Devices Regeneration” menu (c)
is to make settings for the aftertreatment devices regeneration.
For details of the aftertreatment devices regeneration, see
“HANDLE Komatsu Diesel Particulate Filter (KDPF) (3-122)”.

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SCR INFORMATION
Each item in SCR information menu (d) is for displaying infor-
mation related to SCR and DEF.
For details of SCR information, see “HANDLE UREA SCR
SYSTEM WARNING (3-134)”.

MAINTENANCE SCREEN SETTING

Each item of setting menu (e) on maintenance screen is used
for displaying and setting the notification relevant to mainte-
nance.
The items on the maintenance display are as follows.
a b
Air Cleaner Clean and Change -
Coolant Change -
Hydraulic Oil Additional Filter Change -
Hydraulic Oil Pilot Filter Change -
Engine Oil Change (*1 500
Engine Oil Filter Change (*1 500
Fuel Prefilter Change 500
Fuel Main Filter Change 1000
Hydraulic Tank Breather Change 1000
Hydraulic Oil Filter Change 1000
Damper Case Oil Check and Add 1000
Swing Machinery Oil Change 1000
DEF Breather Change 1000
Final Drive Oil Change 2000
DEF Filter Change 2000
KCCV Filter Change 2000
KDPF Filter Cleaning 4500
DEF Tank Cleaning 4500
Fuel Doser Cleaning 4500
Hydraulic Oil Change 5000

a: Maintenance items
b: Default maintenance interval settings (h)
c: Time remaining until maintenance (h)
*1:
When using engine oil for cold district, the maintenance interval setting must be changed. For details of the oil,
see “RECOMMENDED FUEL, COOLANT, AND LUBRICANT (7-5)”.

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EXPLANATION OF COMPONENTS OPERATION

On the maintenance menu screen, it is possible to perform the

following operations with switches F1 to F6.
F1, F2: Moves to the right and left menus.
F3: Moves to the next item (1 line below). When on the last
line, it moves to the first line on the next page.
F4: Moves to the previous item (1 line above). When on the
first line, it moves to the last line on the previous page.
F5: Returns to the standard screen.
F6: If this switch is kept pressed, the screen changes to the
screen for resetting the remaining time to the maintenance
for the selected item.
REMARK
When resetting the remaining time to the maintenance, keep switch F6 pressed for at least 1.5 seconds. If this
time is short, the switch operating sound can be heard, but the screen does not switch to the screen for reset-
ting the remaining time to the maintenance.
• If no switch is operated for 30 seconds on the maintenance menu screen, the screen automatically returns
to the standard screen.
• When the maintenance time caution lamp is lit on the standard screen, press F6 on the standard screen
and the screen automatically displays the maintenance menu screen.
• On the maintenance menu screen, if the time remaining to the maintenance for any item is less than 30
hours (initial setting value), the remaining time display (c) is highlighted in yellow. If the time remaining to
the maintenance is less than 0 hour, display (c) is highlighted in red.
• If you want to change the setting for the maintenance time or maintenance notice time (initial setting: 30
hours), consult your Komatsu distributor.
Operations on the maintenance time reset screen
On the maintenance menu screen, if switch F6 is kept pressed for at least 1.5 seconds, the screen changes to
the maintenance time reset screen.
Reset the remaining time to the maintenance on this screen.
1. Press switch F6 when the reset screen is in the condition
shown in the figure. The screen switches to the reconfir-
mation screen.
REMARK
• When canceling the reset, press switch F5. The
screen returns to the maintenance menu screen.
• On the reset screen, if no switch is operated for more
than 30 seconds, the screen automatically changes to
the maintenance menu screen.

2. The reconfirmation screen is displayed.

If switch F6 is pressed again, the remaining time is reset
and the screen returns to the maintenance menu screen.
REMARK
• When canceling the reset, press switch F5. The
screen returns to the maintenance menu screen.
• On the reconfirmation screen, if no switch is operated
for more than 30 seconds, the screen automatically
returns to the maintenance menu screen.

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MONITOR SETTINGS
Each item of “Monitor Setting” menu (f) is to make settings for
the monitor.

SCREEN ADJUSTMENT
Use “Screen Adjustment” menu to adjust brightness of the monitor screen.
1. Select screen adjustment (1) on the “Monitor Setting”
menu screen, then press switch F6.

2. Use switches F2 to F6 to adjust brightness of the screen.

F2: Resets an adjusted value to default value.
F3: Moves the indicator to the left by one notch.
F4: Moves the indicator to the right by one notch.
F5: Cancels the change and returns the screen to the
monitor setting menu screen.
F6: Accepts the change and then returns to the monitor
setting menu screen.
REMARK
• If the light switch is at night mode ON, and the screen
is adjusted, it is possible to adjust the brightness of
the monitor screen (night mode).
• If the light switch is at day mode ON, and the screen is
adjusted, it is possible to adjust the brightness of the
monitor screen (day mode).
• As long as "*" mark is displayed in the upper right cor-
ner of the screen, brightness is automatically restrict-
ed by the machine monitor to protect the liquid crystal.
Screen adjustment may not change the screen bright-
ness as long as "*" mark is displayed. However, it is
not an error.
• The state of the previous screen display (camera dis-
play and meter display or only meter display) is re-
flected on the background of the screen adjustment
screen.
Screen adjustment (camera)
Use “Screen Adjustment” (camera) to adjust brightness of the camera screen.

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EXPLANATION OF COMPONENTS OPERATION

1. Select screen adjustment (camera) (2) on the “Monitor

Setting” menu screen, then press switch F6.

2. Use switches F2 to F6 to adjust brightness of the screen.

F2: Resets an adjusted value to default value.
F3: Moves the indicator to the left by one notch.
F4: Moves the indicator to the right by one notch.
F5: Cancels the change and returns the screen to “Monitor
Setting” menu screen.
F6: Accepts the change and returns the screen to “Monitor
Setting” menu screen.
REMARK
As long as "*" mark is displayed in the upper right corner of
the screen, brightness is automatically restricted by the
machine monitor to protect the liquid crystal. Screen ad-
justment may not change the screen brightness as long as
"*" mark is displayed. However, it is not an error.

CLOCK ADJUSTMENT
“Clock Adjustment” menu is used to change the setting of the clock displayed on the standard screen of the
monitor.
1. Select “Clock Adjustment” (3) on “Monitor Setting” menu
screen, then press switch F6. The screen switches to the
selection menu for the clock adjustment.
The following 5 items can be changed.
(a): “GPS Synchronization”
(b): “Calendar”
(c): “Time”
(d): “12h/24h Mode”
(e): “Daylight Saving Time”
REMARK
• (b) “Calendar” and (c) “Time” need to be readjusted
since they are reset after a long-term storage.
• When the “GPS Synchronization” is set to ON, they
are automatically readjusted.
2. Perform the following setup procedure by operating
switches F3 to F6 on the “Clock Adjustment” screen for se-
lecting a menu.

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OPERATION EXPLANATION OF COMPONENTS

GPS SYNCHRONIZATION SETTING

On machines equipped with KOMTRAX, turning ON “GPS Syn-
chronization” menu enables automatic setting of the monitor's
date and time in accordance with the clock of GPS.
F3: Moves to the next item (1 line below). Moves to the top line
when on the bottom line.
F4: Moves to the previous item (1 line above). Moves to the
bottom line when on the top line.
F5: Cancels change and returns to “Clock Adjustment” screen.
F6: Displays the setting screen for selected item.
REMARK
• When the machine is in the environment where the radio
waves from GPS cannot be received, such as inside of a
building, the automatic setting function may not work.
• Turning ON “GPS synchronization” menu disables select-
ing the menu for “Calendar” and “Time”.

CALENDAR SETTING
Adjust the date of the monitor.
REMARK
As long as “GPS Synchronization” menu is turned on, “Calendar” menu is not selectable.
1. Select “Calendar” (b) on “Clock Adjustment” screen, then
press switch F6.

2. The “Calendar” screen is displayed.

When year display (A) is highlighted in yellow, operate the
switches as follows to change year display (A). If it is not
necessary to change the year setting, press switch F6.
F3: Calendar goes back 1 year.
F4: Calendar advances 1 year.
F5: Cancels change and returns the screen to “Clock Ad-
justment” screen.
F6: Proceeds to setting for month
3. When month display (B) is highlighted in yellow, operate
the switches as follows to change month display (B). If it is
not necessary to change the month, press switch F6.
F3: Calendar goes back 1 month.
F4: Calendar advances 1 month.
F5: Cancels change and returns to the year setting screen.
F6: Proceeds to setting for date.

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EXPLANATION OF COMPONENTS OPERATION

4. When date display (C) is highlighted in yellow, operate the

switches as follows to change day display (C). If it is not
necessary to change the day, press switch F6.
F3: Calendar goes back 1 day.
F4: Calendar advances 1 day.
F5: Cancels change and returns to the month setting
screen.
F6: Accepts change and returns the screen to “Clock Ad-
justment” screen.

TIME SETTING
Adjust the time of the monitor clock.
REMARK
As long as “GPS Synchronization” is turned ON, “Time” menu is not selectable.
1. Select “Time” (c) on “Clock Adjustment” screen, then press
switch F6.

2. The “Time” screen is displayed.

When the hour display (D) is highlighted in yellow, operate
the switches as follows to change hour display (D). If it is
not necessary to change the hour setting, press switch F6.
F3: The time goes back 1 hour.
F4: The time advances 1 hour.
F5: Cancels change and returns the screen to “Clock Ad-
justment” screen.
F6: Proceeds to setting for the minute.
3. When minute display (E) is highlighted in yellow, operate
the switches as follows to change minute display (E). If it is
not necessary to change the minute, press switch F6.
F3: The time goes back 1 minute.
F4: The time advances 1 minute.
F5: Cancels change and returns to the time setting screen.
F6: Accepts change and returns the screen to “Clock Ad-
justment” screen.

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OPERATION EXPLANATION OF COMPONENTS

SWITCH 12H/24H DISPLAY MODE

Choose either a 12-hour display (am/pm) or a 24-hour display.
• 24-hour system display
• 12-hour system display (AM/PM)
1. Select “12h/24h Mode” (d) on “Clock Adjustment” screen,
then press switch F6.

2. “12h/24h Mode” screen appears.

F3: Moves to the next item (1 line below). Moves to the top
line when it is on the bottom line.
F4: Moves to the previous item (1 line above). Moves to
the bottom line when it is on the top line.
F5: Cancels the change and returns the screen to “Clock
Adjustment” screen.
F6: Accepts change and returns to “Clock Adjustment”
screen.

DAYLIGHT SAVING TIME (SUMMER TIME) SETTING

If “Daylight Saving Time” is turned on, the clock display becomes 1 hour forward. If “Daylight Saving Time” is
turned off, the clock display returns to the set time.
1. Select “Daylight Saving Time” (e) on “Clock Adjustment”
screen, then press switch F6.

2. The “Daylight Saving Time” screen is displayed.

F3: Moves to the next item (1 line below). Moves to the top
line when on the bottom line.
F4: Moves to the previous item (1 line above). Moves to
the bottom line when on the top line.
F5: Cancels change and returns to “Clock Adjustment”
screen.
F6: Accepts change and returns the screen to “Clock Ad-
justment” screen.
REMARK
Daylight saving time or summer time means moving the
clock forward an hour to take advantage of the fact that the
sun rises early in summer in our daily life.

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EXPLANATION OF COMPONENTS OPERATION

LANGUAGE SETTINGS
On “Language Setting” menu, it is possible to select the language used on the monitor display.
The languages that can be selected are as follows.
Japanese, English, German, French, Spanish, Portuguese, Italian, Swedish, Dutch, Danish, Norwegian, Fin-
nish, Icelandic, Czech, Hungarian, Polish, Slovak, Slovene, Estonian, Latvian, Lithuanian, Bulgarian, Greek, Ro-
manian, Croatian and Serbian
1. Select “Language” (4) on the “Monitor Setting” menu, then
press switch F6.

2. Select the language to use for the display, then press

switch F6. The screen display changes to the selected lan-
guage.
On “Language” screen, it is possible to perform the follow-
ing operations with switches F3 to F6.
F3: Moves to the item below.
F4: Moves to the item above.
F5: Cancels change and returns to the “Monitor Setting”
screen.
F6: Accepts change and returns the screen to the “Monitor
Setting” screen.

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OPERATION EXPLANATION OF COMPONENTS

OPERATOR ID
You can check and change the “Operator ID” which is under identification on the “Operator ID” menu.
The “Operator ID” menu is not displayed when the operator identification function is disabled.
REMARK
Contact your Komatsu distributor for details of the method of setting, changing, or canceling the operator identi-
fication function.

WHEN OPERATOR IDENTIFICATION FUNCTION IS AVAILABLE WITH SKIP

When the starting switch is ON and ID is inputted, the identified
ID is displayed in the column of “Operator ID” on the “Monitor
Setting” menu screen.

When the starting switch is ON and “SKIP” is selected, “Opera-

tor ID” is displayed in the column of “****” on the “Monitor Set-
ting” menu screen.

1. Select “Operator ID” (5) on the “Monitor Setting” menu

screen, then press switch F6 for 1 second.

2. The “Operator ID Change” screen is displayed.

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EXPLANATION OF COMPONENTS OPERATION

• Input the already registered ID on the “Operator ID

Change” screen and press F6. Then, the identified ID
can be changed.
A message is displayed below and the screen returns
to the “Monitor Setting” menu screen.
On the “Monitor Setting” menu screen, the inputted ID
is displayed in the column of “Operator ID”.

• When you press switch F1 on the “Operator ID

Change” screen, a message is displayed below and
the screen returns to the “Monitor Setting” menu
screen.
On the “Monitor Setting” menu screen, as the same
way when the starting switch is ON and “SKIP” is se-
lected, “Operator ID” is displayed in the column of
“****”.
In this case, the operator ID is not identified.

• When you press switch F6 after inputting the ID which

is not registered to the “Operator ID Change” screen,
a message is displayed below and the screen returns
to the “Monitor Setting” menu screen.
In this case, the identified ID is not changed.
• On the “Operator ID Change” screen, if no switch is
operated for more than 30 seconds, the screen auto-
matically changes to the “Monitor Setting” menu
screen.
In this case, the identified ID is not changed.

WHEN OPERATOR IDENTIFICATION FUNCTION IS AVAILABLE WITHOUT SKIP

When the operator identification function is available without
SKIP, the identified ID number is not displayed in the “Operator
ID” column of “Monitor Setting” screen.

1. Select “Operator ID” (5) on the “Monitor Setting” menu

screen, then press switch F6 for 1 second.

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OPERATION EXPLANATION OF COMPONENTS

2. The “Operator ID Change” screen is displayed.

• Input the already registered ID on the “Operator ID

Change” screen and press F6. Then, the identified ID
can be changed.
A message is displayed below and the screen returns
to the “Monitor Setting” menu screen.

• When you press switch F6 after inputting the ID which

is not registered to the “Operator ID Change” screen,
a message is displayed below and the screen returns
to the “Monitor Setting” menu screen.
In this case, the identified ID is not changed.
• On the “Operator ID Change” screen, if no switch is
operated for more than 30 seconds, the screen auto-
matically changes to the “Monitor Setting” menu
screen.
In this case, the identified ID is not changed.

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EXPLANATION OF COMPONENTS OPERATION

MESSAGE DISPLAY
On machines equipped with KOMTRAX, you can see the mes-
sages from your Komatsu distributor on this message display
menu (g). When there is any message, the message display at
the left end of the standard screen lights up.

Message is distinguished as follows according to the lighting

states of message display (1).
Lights up in green (A): There is unread message.
Lights up in blue (B): There is any read message to which no
reply is made.
OFF: No messages
REMARK
• When the message display lights up in blue (B), it means
that no reply has been made yet to any read message to
your Komatsu distributor. Reply to the message according
to the replying method mentioned below:
• If the starting switch is turned to OFF position when there
is any unread message, the message will be displayed on
the end screen, and when the monitor is started next time,
the message will change to a read message (the message
display: lights up in blue (B)).
• The message will be deleted when it becomes out of date
or when a new message reaches.

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OPERATION EXPLANATION OF COMPONENTS

CHECK MESSAGE
1. Press switch F6 on the standard screen.
When there is any message, message display (1) lights
up.
While message display (1) is lit, press switch F6, and the
mail confirmation menu (e) directly opens.
Select the mail confirmation menu (e), and you can read
the received message.

2. In case of a message requesting for reply, the column of

“Numeric Input: []” is displayed in place (2) of the mail con-
firmation menu. Make a reply to the message.
REMARK
• (3) is the subject of the received message. When no
message is received, “No message” is displayed in
place (3).
• (4) is the serial number of received messages.

REPLY TO MESSAGE
1. When replying to a message, input the selected item num-
ber in "Numeric Input" box (1) on the screen of mail confir-
mation menu (g). The selected item number is written in
place (2) of the message text.
• Input the number by using the monitor panel switch.
Each switch corresponds to the value shown on the
right side below the switch.
• If you input an incorrect number, press switch F5, and
you can clear an input character at a time.
• If switch F5 is pressed when the input column is blank,
the screen returns to the standard screen.
2. After inputting a selected item number, press switch F6.
3. When the message “Do you send Numeric Input?” is dis-
played in column (1) of the mail confirmation menu screen,
press switch F6 again. The input value will be sent out.
When the message “Do you send Numeric Input?” is dis-
played, if you press switch F5, the screen returns to the
screen for replying to message. At this time, the previous
input value will be cleared.

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EXPLANATION OF COMPONENTS OPERATION

SWITCHES

(1) One-touch power maximizing switch (9) Ceiling window wiper switch (if equipped)
(2) Horn switch (10) Cigarette lighter
(3) Starting switch (11) Room lamp switch
(4) Fuel control dial (12) Seat heater switch (if equipped)
(5) Lamp switch (13) Engine shutdown secondary switch
(6) Swing lock switch (14) Pump secondary drive switch
(7) Machine push-up switch (15) Swing parking brake cancel switch
(8) Revolving lamp switch (if equipped) (16) Lock lever automatic lock cancel switch

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OPERATION EXPLANATION OF COMPONENTS

STARTING SWITCH
Starting switch is used to start or stop the engine.
(A): OFF position
The key can be inserted or withdrawn. Switches for the electri-
cal system (except room lamp) are all turned off, and the en-
gine is stopped.
(B): ON position
Electric current flows through the charging and lamp circuits.
Keep the switch at this position while the engine is running.
(C): START position
This is the position to start the engine. Keep the key at this position during cranking and release it immediately
after the engine starts.
The key will automatically return to ON position (B).

FUEL CONTROL DIAL

Fuel control dial is used to control the engine speed and out-
put.
(a) Low idle (MIN)
The position where the dial is turned fully to the left.
(b) High idle (MAX)
The position where the dial is turned fully to the right.

CIGARETTE LIGHTER
The cigarette lighter is used to light cigarettes.
When the cigarette lighter is pushed in, it will return to its origi-
nal position after a few seconds, so pull it out to use it.
If the cigarette lighter is removed, the socket can be used as an
85 W (24 V x 3.5 A) power source.
NOTICE
This cigarette lighter is for 24 V. Do not use it as a power
supply for 12 V equipment.

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EXPLANATION OF COMPONENTS OPERATION

SWING LOCK SWITCH

k WARNING
• When not using the swing operation, e.g. when traveling, put the swing lock switch to ON position.
• On slopes, even when the swing lock switch is at ON position, the weight of the work equipment
may cause the upper structure to swing if the swing control lever is operated in the downhill direc-
tion.

Swing lock switch is used to lock the upper structure so that it

cannot swing.
(a) ON position
The swing lock is always applied, and the upper structure does
not swing even when the swing is operated. In this condition,
the swing lock pilot lamp lights up.
(b) OFF position
The swing lock is canceled allowing the upper structure to
swing when operating the swing control lever.

LAMP SWITCH
Lamp switch is used to light up the working lamp and monitor
illumination.
(a) Night position
Lamps light up and monitor illumination is set to night mode.
(b) Day position
Lamps light up and monitor illumination is set to day mode.
(c) OFF position
Lamps go out.
(The monitor illumination is set to day mode.)

HORN SWITCH
Horn switch is located on R.H. work equipment control lever.
When switch is pressed, the horn sounds.

ONE-TOUCH POWER MAXIMIZING SWITCH

One-touch power maximizing switch is used to actuate the one-
touch power maximizing function.
Press once (single click) and keep the switch pressed. The
one-touch power maximizing function is actuated for a maxi-
mum of 8.5 seconds when the working mode is in P, E, ATT/P,
and ATT/E modes.

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ROOM LAMP SWITCH

NOTICE
If the room lamp is left to be turned on, the batteries may be exhausted. Always turn the switch to OFF
position after using room lamp.
Use room lamp switch to light up the room lamp.
(a) ON position
Lights up
(b) OFF position
OFF
The room lamp lights up even when the starting switch is at
OFF position.

PUMP SECONDARY DRIVE SWITCH

k CAUTION
When pump secondary drive switch (1) is being used or
immediately after it is used, the temperature of resistor (2)
under the fuse may become high.
When operating the switch or replacing the fuse, take care
not to touch resistor (2).

NOTICE
• The pump secondary drive switch enables you to per-
form operation temporarily when any problem occurs
on the pump control system. Do not use it except for
emergency. Repair the problem as soon as possible.
• If this switch is moved to “Emergency” position by
mistake while the machine is operating normally,
“L03” appears in the display.
If “L03” is displayed during operation, press the moni-
tor function switch F5 to check whether the current
failure code includes any of the hydraulic system er-
rors “DXA9KB”, “DXA8KB”, “DXA9KA” or “DXA8KA”.
Then make sure this switch is set to “Normal” posi-
tion.
The pump secondary drive switch enables you to perform oper-
ation temporarily when any problem occurs on the pump con-
trol system.
(a) Emergency
When abnormal (switch is set to upper position)
(b) Normal
When normal (switch is set to lower position)

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EXPLANATION OF COMPONENTS OPERATION

If the Current Abnormality list includes any of the hydraulic sys-

tem errors “DXA9KB”, “DXA8KB”, “DXA9KA” or “DXA8KA”, you
can perform operation temporarily by setting this switch to
"Emergency" position (a).

SWING PARKING BRAKE CANCEL SWITCH

NOTICE
Swing operations can be performed temporarily with swing parking brake cancel switch when there is a
problem in the swing parking brake system. Do not use it except for emergency. Repair the problem as
soon as possible.
Swing operations can be performed temporarily with swing
parking brake cancel switch when there is a problem in the
swing parking brake system (when the upper structure does
not swing but the display does not show “L03”).
(a) Cancel
When abnormal (switch is set up)
(b) Normal
When normal (switch is pushed down)
• When the upper structure does not swing but the display
does not show “L03”, move this switch to Cancel position
(a), and operation can be performed.
• When the switch is moved to Cancel position (a), the
swing lock pilot lamp flashes.

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OPERATION EXPLANATION OF COMPONENTS

LOCK LEVER AUTOMATIC LOCK CANCEL SWITCH

NOTICE
The lock lever automatic lock cancel switch is used to disable the lock lever automatic lock function
and enable the operations of the work equipment and machine temporarily, when the lock lever auto-
matic lock function is abnormal. Use this switch only when the machine or working machine needs to
be moved temporarily in an abnormal and emergency condition. Repair the problem as soon as possi-
ble.
For details of the lock lever automatic lock function, see “LOCK LEVER (3-105)”.
If the lock lever automatic lock function is abnormal, when the
lock lever is canceled normally under the condition that the
work equipment control lever or travel lever is in neutral posi-
tion, this function is actuated by mistake and the machine or
the work equipment may not move. The machine or the work
equipment can be operated temporarily by setting the lock lev-
er automatic lock cancel switch to cancel position (a).
(a) Cancel
When abnormal (switch is set up)
(b) Normal
When normal (switch is pushed down)
• When the lock lever automatic lock cancel switch is set to
cancel position (a), the lock lever automatic lock cancel pi-
lot lamp lights up. At the same time, the mode is displayed
in the center of the monitor display, and after 2 seconds,
the screen returns to the standard screen.
• After moving the machine or work equipment temporarily
by operating this switch, stop the engine, return the switch
to normal position (b), and then ask your Komatsu distribu-
tor for repair.

REVOLVING LAMP SWITCH

(if equipped)
Revolving lamp switch is used to light up the yellow revolving
lamp on top of the cab.
(a) ON
Lights up
(b) OFF
OFF

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EXPLANATION OF COMPONENTS OPERATION

CEILING WINDOW WIPER SWITCH

(if equipped)
Windshield wiper switch is used to actuate the ceiling window
windshield wiper and spray the washing water.
(a) Windshield wiper position
The windshield wiper on the ceiling window operates.
(b) Washer position
While depressing the switch, the washing water for the ceiling
window is sprayed and windshield wiper operates at the same
time.
By finger off the switch, it returns to (a) position, washing water
stops, and only ceiling window windshield wiper operates.
(c) Stop position
The windshield wiper stops.

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OPERATION EXPLANATION OF COMPONENTS

ENGINE SHUTDOWN SECONDARY SWITCH

NOTICE
The engine shutdown secondary switch is used to stop the engine when the starting switch is turned to
OFF position but the engine does not stop.
• Use the engine shutdown secondary switch only in an emergency.
Contact your Komatsu distributor for repair immediately when there is any abnormality on this
switch.
• If the engine shutdown secondary switch is moved to the "stop engine" position by mistake while
the machine is operating normally, “Engine Shutdown Secondary SW In Operation” is displayed on
the machine monitor.
If “Engine Shutdown Secondary SW In Operation” is displayed on the machine monitor, check that
the switch cover is closed and the switch is in the "normal" position. If not, set it to the "normal"
position.
1. Raise cover (C) and open it.

2. Turn the engine shutdown secondary switch to upper posi-

tion (a) and the engine stops.
(a) Engine stopped
When abnormal (switch is set to upper position)
(b) Normal
When normal (switch is set to lower position)

• When cover (C) is closed, the engine shutdown secondary switch automatically returns to the normal
position (b).
• When the starting switch is turned to ON position
while the engine shutdown secondary switch is in the
engine stopped position (a), “Engine Shutdown Sec-
ondary SW In Operation” is displayed on the machine
monitor.
If this screen is displayed, return the engine shutdown
secondary switch to the normal position (b).

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EXPLANATION OF COMPONENTS OPERATION

SEAT HEATER SWITCH

(if equipped)
This seat heater switch is used to warm the seat.
(a) OFF
Stops the seat heating.
(b) ON
Start the seat heating and the seat becomes warm.

MACHINE PUSH-UP SWITCH

Machine push-up switch is used to set the safety valve pres-
sure on the head side of the boom circuit to 2 stages.
(a) Low-pressure set
Since the bracing force of the boom is decreased, the machine
is less moved up during digging work and the operator can dig
smoothly.
Use this position for the general normal operation for ordinary
soil, soft rocks, blasted rocks, etc.
(b) High-pressure set
Since the bracing force of the boom is increased, the machine
can easily escape from soft ground.

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OPERATION EXPLANATION OF COMPONENTS

CONTROL LEVERS AND PEDALS

(1) Lock lever (4) R.H. work equipment control lever (with auto-de-
(2) Travel levers (with pedal and auto-deceleration celeration system)
system)
(3) L.H. work equipment control lever (with auto-decel-
eration system)

LOCK LEVER
k WARNING
• When leaving the operator's seat, set the lock lever securely to LOCK position. If the lock lever is
not at LOCK position and the control levers or control pedals are touched by mistake, it may lead to
serious personal injury or death.
• Always check that the lock lever is in LOCK position.
• When pulling the lock lever up, or when pushing the lock lever down, be careful not to touch the
work equipment control lever.
• Before setting the lock lever to FREE position, make sure that all control levers and pedals are set
to NEUTRAL position. If any of them is out of NEUTRAL position, the work equipment or machine
may move suddenly and cause a serious personal injury or death.

The lock lever is a device to lock the work equipment, swing,

travel, and attachment control levers (if equipped).
(L) LOCK position
Even when levers or attachment control pedal (if equipped) are
operated, machine does not move
(F) FREE position
Machine moves according to operation of levers or attachment
control pedal (if equipped).

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EXPLANATION OF COMPONENTS OPERATION

REMARK
The lock lever is of hydraulic lock type. Accordingly, when it is in LOCK position (L), the control levers or control
pedals move but the machine does not move.
Automatic lock function of lock lever
k WARNING
• The lock lever automatic lock function assists the operator in judgment to reduce damage caused
by accident. It does not stop the work equipment or machine in all situations.
• Even if the lock lever automatic lock function works, the work equipment or machine may not stop
immediately or may stop after moving by a certain distance. Also, the lock lever automatic lock
function may not work in the following cases. Accordingly, do not rely on it too much.
• When the hydraulic oil temperature is low (When the hydraulic oil temperature caution lamp in-
dicates low temperature)
• When the viscosity of the hydraulic oil used is higher than that of the genuine hydraulic oils
which Komatsu recommends
• Before setting the lock lever to FREE position, make sure that all control levers and pedals are set
to NEUTRAL position. If any of them is out of NEUTRAL position, the work equipment or machine
may move suddenly and cause a serious personal injury or death.

The lock lever automatic lock function prevents the work equip-
ment or machine from operating unintendedly when the lock
lever is released while the work equipment control lever or trav-
el lever is operated. The lock lever is set in the same state as
when locked automatically.
When this function works, the operations of the work equip-
ment, swing, travel, and attachment are locked automatically
and the message shown in the figure is displayed.
While this function is in operation, the machine does not move
even if a control lever or the attachment control switch is oper-
ated while the lock lever is in FREE position (F).
To cancel the lock, return the lock lever to LOCK position (L),
check that each control lever and the attachment switch are in
neutral, and then release the lock lever again.
For the genuine hydraulic oils which Komatsu recommends,
see “RECOMMENDED FUEL, COOLANT, AND LUBRICANT
(7-5)”.

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OPERATION EXPLANATION OF COMPONENTS

TRAVEL LEVER
k WARNING
• If you perform operations with your foot on the pedal, the machine may suddenly start if you de-
press the pedal by mistake, and this may lead to serious personal injury or death. Be extremely
careful when using the pedal for travel and steering operations, and do not put your foot on the
pedal when it is not necessary.
• When the track frame is facing the rear, the direction of operation of the steering lever is the oppo-
site to the direction of movement of the machine (forward/reverse, right/left turn).
When operating the travel lever, always check if the track frame is facing the front or the rear. (If the
sprocket is at the rear, the track frame is facing the front.)

The travel lever is used to change the direction of travel be-

tween forward and reverse. ( ) shows the pedal operation.
(a) FORWARD
The lever is pushed forward
(Depress the front side of pedal.)
(b) REVERSE
The lever is pulled back
(Depress the rear side of pedal.)
N (NEUTRAL)
The machine stops.
REMARK
If the lever is shifted to FORWARD or REVERSE position from
NEUTRAL position, the alarm sounds to warn that the machine
is starting to move.

WORK EQUIPMENT CONTROL LEVER

The L.H. work equipment control lever is used to operate the
arm and upper structure.
Arm control
(a): Arm OUT
(b): Arm IN
Swing control
(c): Swing RIGHT
(d): Swing LEFT
N (NEUTRAL)
The upper structure and arm are held in position and do not move.

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EXPLANATION OF COMPONENTS OPERATION

The R.H. work equipment control lever is used to operate the

boom and bucket.
Boom control
(a): Boom RAISE
(b): Boom LOWER
Bucket control
(c): Bucket DUMP
(d): Bucket CURL
N (NEUTRAL)
The boom and bucket are held in position and do not move.

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OPERATION EXPLANATION OF COMPONENTS

OTHER EQUIPMENT
METHOD FOR OPENING AND CLOSING CEILING WINDOW
k WARNING
When leaving the operator's seat, set the lock lever securely to LOCK position.
If the control lever or control pedal is touched by mistake when the lock lever is in FREE position, it may
cause serious personal injury or death.

When opening
1. Set lock lever (1) securely to LOCK position (L).

2. Push up lock (A) in the front center of the ceiling window

and check that the lock is released. Then hold handle (B)
and push up the ceiling window.

When closing
Hold grip (B), lower the ceiling window, and apply lock (A). If the lock cannot be applied, “open” the ceiling win-
dow, then pull it in again and apply the lock.

METHOD FOR OPENING AND CLOSING CAB FRONT WINDOW

k WARNING
• When opening or closing the front window, bottom window, or door, always set the lock lever to
LOCK position.
If the control lever or control pedal is touched by mistake when the lock lever is in FREE position, it
may cause serious personal injury or death.
• When opening or closing the front window, stop the machine on a level ground, lower the work
equipment to the ground, stop the engine, then perform the operation.
• When opening the front window, hold the handle securely with both hands to pull up, and do not
release your hands until the front window is locked by the automatic lock catch.
• When closing the front window, the window may move quicker under its own weight. Hold the han-
dles securely with both hands when closing it.

It is possible to stow the front window (upper side) in the roof of the operator's compartment.

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EXPLANATION OF COMPONENTS OPERATION

When opening
1. Stop the machine on a level ground, lower the work equip-
ment to the ground, then stop the engine.
Set lock lever (1) securely to LOCK position (L).

2. Check that the wiper blade is stowed in the right stay.

3. Hold handles (A) (2 places) on the right and left top sides
of the front window, and pull levers (B) (2 places) to re-
lease the locks at the top of the front window. The top of
the front window will come out.

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OPERATION EXPLANATION OF COMPONENTS

4. Hold lower handle (C) with your left hand from inside the
operator's cab, and with your right hand, grip top handle
(D), pull it up, and push it against lock catch (E) at the rear
of the cab securely to lock the window.
REMARK
Handles (A) on the right and left top sides of the front win-
dow are not for pulling up the front window. Do not pull up
the front window with the handles (A).

5. Check that lever (B) is securely at LOCK position.

• If the arrow on lock case (F) matches the position of
the arrow on lever (B), the lock is engaged. Check vis-
ually.
• If the arrow on lock case (F) does not match the posi-
tion of the arrow on lever (B), the lock is not engaged.
Repeat the operation in step 5 to engage the lock.

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EXPLANATION OF COMPONENTS OPERATION

When closing
k CAUTION
When closing the window, lower it slowly and be careful not to get your hand caught.

1. Stop the machine on a level ground, lower the work equip-

ment to the ground, then stop the engine.
Set lock lever (1) securely to LOCK position (L).

2. Grip right and left handles (A), and pull down lever (B) to
release the lock.

3. Grip handle (C) at the bottom of the front window with your
left hand and handle (D) at the top with your right hand,
push to the front, then lower slowly.
REMARK
The handles (A) on the right and left top sides of the front
window are not for pulling up and down the window. Do not
pull down the front window with the handles (A).

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OPERATION EXPLANATION OF COMPONENTS

4. When the bottom of the window reaches the top of lower

side window, push the top of the window to the front to
push it against right and left lock catches (G) and engage
the lock.

5. Check that lever (B) is securely at LOCK position.

• If the arrow on lock case (F) matches the position of
the arrow on lever (B), the lock is engaged. Check vis-
ually.
• If the arrow on lock case (F) does not match the posi-
tion of the arrow on lever (B), the lock is not engaged.
Repeat the operation in step 5 to engage the lock.

Removal of front window (lower side)

1. Open the front window (upper side), then hold grip (1), pull
it up, and remove the lower side window.

REMARK
If sand or dust is collected at the bottom of the front win-
dow (lower side), it will be difficult to remove the window. In
addition, when stowing, the sand and dust stuck to the
glass will be carried inside the cab. To prevent this, clean
area (A) before removing.

2. After removing the lower side window, store it at the right

rear of the operator's cab, and set lever (2) to lock position
(B) to hold it securely in position.
3. When removing it, set lever (2) to release position (C),
hold the glass with both hands, and pull it up.

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EXPLANATION OF COMPONENTS OPERATION

EMERGENCY ESCAPE HAMMER

k CAUTION
• If it is necessary to break the window glass with the hammer, be extremely careful not to get injured
with scattered pieces of broken glass.
• To prevent injury, remove the broken pieces of glass remaining in the frame before escaping
through the window. Be careful also not to slip on the broken pieces of glass.

If it should become impossible to open the cab door for any

reason, and it is necessary to make an emergency escape
from the operator's compartment, use the hammer (A) to es-
cape.

To escape from the operator's cab, use the hammer (A) to

break the glass and escape through the window.

METHOD FOR USING DOOR LOCK

k WARNING
• Before the releasing the door lock, always place the machine on a level ground.
• Never release the door lock on a slope. The door may suddenly close and cause injury.
• When releasing the door lock, do not extend your body or hands outside the machine or do not put
your hands on the door frame. The door may suddenly close and cause injury.

1. Use the door lock to keep and fix the door opened.
2. Push the door against catch (1) to lock it in position.
When closing the door, push down lever (2) on the left side
of the operator's seat, and the catch is released.
3. When keeping the door open, fix it securely to the catch.

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OPERATION EXPLANATION OF COMPONENTS

CAB DOOR HINGE

The cab door hinge has 2 rotation axes with stoppers (S).
REMARK
When opening and closing the cab door, hitting sound of stop-
per (S) is heard, but this is not a failure.

CAP AND COVER WITH LOCK

Use the starting switch key to open and close the locks on the caps and covers.
For the locations and opening or closing method of the cap with lock and cover, see “LOCK (3-225)”.
Insert the key as far as it will go to the shoulder (A) and turn it.
If the key is turned when it is not inserted all the way to the
end, it may break.

DRINK BOX
It is provided on the rear right side of the operator's seat to
store drinks.
Air according to the setting of the air conditioner blows into the
drink box.

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EXPLANATION OF COMPONENTS OPERATION

MAGAZINE BOX
Located on the left side of the operator's seat.
Keep Operation and Maintenance Manual in this box so that it
can be taken out and read whenever necessary.

CUP HOLDER
The cup holder is located on the left side of the operator's seat.

ASHTRAY
This is on top of the console box on the left side of the opera-
tor's seat.
Always extinguish your cigarette before putting it in the ashtray
and be sure to close the lid.

NOTICE
While removing the ashtray, if it is stuck in the console
cover and hard to be removed, open lid (A) of ashtray, then
hold the ashtray body (B) and twist it to remove.
If you hold lid (A) of ashtray and twist it, the ashtray may
break.

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OPERATION EXPLANATION OF COMPONENTS

POWER SUPPLY OUTLET

24 V power source
NOTICE
Do not use it as a power supply for 12 V equipment.
This will cause failure of the equipment.
When cigarette lighter is removed, the lighter socket can be
used as a power source.
The capacity of the cigarette lighter is 85 W (24 V x 3.5 A).
REMARK
Use 24 V power source while engine is running.

12 V power source
This power source can be used up to a capacity of 144 W (12
V x 12 A).
When it is used at 1 place: 144 W (12 V x 12 A)
When it is used at 2 places: 144 W in total
REMARK
Use 12 V power source while engine is running.

FUSE
NOTICE
Before replacing a fuse, be sure to turn the starting switch to OFF position, then turn the battery discon-
nect switch to OFF position.
• The fuse holder is at the rear of the operator's seat.
• It is provided to protect the electrical component and wiring
from burning out.
• If the fuse becomes corroded, or looks white powdery, or
the fuse is loose in the fuse holder, replace the fuse.
• Replace the fuse with the one of the same capacity.

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EXPLANATION OF COMPONENTS OPERATION

Fuse capacities and circuit names

Fuse ca-
No. Name of circuit
pacity
(1) 5A Relay for lamp, emergency switch
(2) 30 A Solenoid valve
(3) 5A PPC hydraulic lock solenoid
(4) 10 A Window washer, cigarette lighter
(5) 10 A Horn
(6) 5A Auto preheater relay
(7) 10 A Revolving lamp
(8) 10 A Radio, speaker, left knob switch
(9) 20 A Headlamp, rear lamp
(10) 20 A Air conditioner unit
(11) 10 A Optional power source (1)
Optional power source (2), 12 V power
(12) 30 A
source and air suspension seat with heater
(13) 5A Air conditioner ECU power source
(14) 5A Key ACC signal
(15) 10 A Working lamp
Radio backup, room lamp, system operating
(16) 10 A
lamp
(17) 20 A Monitor, Pump controller
(18) 30 A Engine controller
(19) 5A Air conditioner ECU backup
Fuel feed pump, optional power source (con-
(20) 25 A
tinuous power supply)
(21) 20 A Sensor power source relay (1)
(22) 10 A Sensor power source relay (2)
(23) 10 A DEF line heater relay (1)
(24) 20 A DEF line heater relay (2)

REMARK
• Spare fuses are installed in the back of the fuse holder lid
at the rear of the operator's seat.
• After using spare fuses, replenish them immediately.
• One spare fuse is installed for each 5 A, 10 A, 20 A, 25 A,
and 30 A.

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OPERATION EXPLANATION OF COMPONENTS

FUSIBLE LINK
NOTICE
Before replacing a fusible link, be sure to turn the starting switch to OFF position, then turn the battery
disconnect switch key to OFF position.
If the engine starting motor does not operate even when the
engine starting switch key is turned to START position, fusible
link (1) and (2) may be broken. Open the battery box cover on
the right side of the machine to check the fusible links, and re-
place them.
(1): Fusible link for 24 V power supply
(2): Fusible link for 24 V continuous power supply
Fusible link (2) is fixed to a near wiring harness with a tape.
When checking or replacing, confirm the wiring harness No.
REMARK
A fusible link refers to the large-sized fuse wiring installed in
the high current flowing part of the circuit.
It is provided to protect electrical components and wiring from
burning out, in the same way as an ordinary fuse does.

TOOL BOX
Store the tools in it.
This is installed in the battery box at right of the machine.
NOTICE
Do not put a tool so large that it reaches the battery in the
tool box.
This will cause the breakage of the battery.

GREASE PUMP HOLDER

This is installed in the battery box at front right of the machine.
Keep the grease pump hooked on this holder while it is not
used.

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EXPLANATION OF COMPONENTS OPERATION

FIRE EXTINGUISHER
(if equipped)
A fire extinguisher is provided at the rear part inside the opera-
tor's cab.
The directions are described on the nameplate affixed to the
fire extinguisher. Carefully read and understand them before-
hand for emergencies.

BATTERY DISCONNECT SWITCH

k CAUTION
• Do not operate the battery disconnect switch while the engine is running.
The large current generated by the alternator may burn the electric parts and cause a fire.
Engine must be stopped while operating the battery disconnect switch.
• If the battery disconnect switch is turned to OFF position, always remove the switch key.
If someone turns the key to ON position carelessly, this is extremely dangerous.

NOTICE
• Keep battery disconnect switch in ON position except the following cases.
• When the machine is stored for a long time (more than a month)
• When repairing the electrical system
• When performing electric welding
• When handling the battery
• When replacing the fuse, etc.
• Do not turn the battery disconnect switch to OFF position while the system operating lamp is lit. If
the battery disconnect switch is turned OFF while this lamp is lit, the data in the controller may be
lost.
• If this switch is turned to OFF position, all the electrical system is cut out and the functions of KOM-
TRAX stop. In addition, the time information of the clock and the radio tuning information may be
lost. In this case, set the information again. For detail, see “CLOCK ADJUSTMENT (3-86)” and
“HANDLING RADIO (3-244)”.

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OPERATION EXPLANATION OF COMPONENTS

Battery disconnect switch (1) is used for cutting out the electric-
ity from the battery.
This is installed in the battery box at right of the machine.
REMARK
Operate this switch while system operating lamp (2) is OFF.

(O): OFF position

Switch key (1) can be pulled out (and inserted) and the current
from the battery is cut out.
(I): ON position
The current from the battery flows into the circuit.
Before starting the machine, be sure to set the switch to this
position.

SYSTEM OPERATING LAMP

System operating lamp (1) indicates that the controller mount-
ed on the machine is turned ON.
Lamp (1) lights up in green when the controller is turned ON
and goes out in 1 to 6 minutes after the starting switch is turned
to OFF position.
Before operating the battery disconnect switch, check that lamp
(1) is not lit.
NOTICE
If the battery disconnect switch is turned OFF while the
lamp is lit, the data in the controller may be lost.
REMARK
• Even if the starting switch is in OFF position, the controller may operate. The lamp lights up in this situation,
but it is not a failure.
• After the starting switch has been turned OFF, the system operating lamp may stay lit for a long time.
In such case, consult your Komatsu distributor.

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EXPLANATION OF COMPONENTS OPERATION

HANDLE Komatsu Diesel Particulate Filter (KDPF)

k CAUTION
• Exhaust gas temperature may increase during the aftertreatment devices regeneration and the high
temperature may last after the completion of regeneration.
Avoid getting near the exhaust pipe outlet and around the aftertreatment devices to prevent being
burnt.
Also, keep combustible materials away from the exhaust pipe outlet and around the aftertreatment
devices to prevent a fire.
• When there are thatched houses, dry leaves or pieces of paper near the job site, set the system to
the regeneration disable to prevent fire hazards due to highly heated exhaust gas during the after-
treatment devices regeneration.
For the setting, see “PROCEDURE FOR AFTERTREATMENT DEVICES REGENERATION DISABLE
SETTING (3-129)”.

KDPF is a device to capture soot in the exhaust gas to purify

the exhaust gas.
If soot is accumulated to a certain level in the filter, a purifica-
tion process to burn the soot is performed automatically to
keep the filtering performance of KDPF high.
This purification process is called the “regeneration”.
If operations which lower the purification function of KDPF con-
tinues for long hours, the regeneration is performed to protect
the KDPF system, regardless of the quantity of the accumulat-
ed soot.
During the KDPF regeneration, aftertreatment devices regeneration pilot lamp (1) lights up on the monitor.
REMARK
Even if aftertreatment devices regeneration pilot lamp (1) lights
up, the machine does not need to be stopped and the work can
be continued, unless the caution lamp is displayed at the cen-
ter of the monitor.
The KDPF regeneration is performed automatically. However,
the accumulated soot may not be burnt sufficiently and the fil-
tering function may not be improved under certain operating
conditions.

In that case, KDPF soot accumulation caution lamp (2) lights

up. If this lamp lights up, stop the machine in a safe place and
perform the manual stationary regeneration.
For details of the procedure, see “PROCEDURE FOR MAN-
UAL STATIONARY REGENERATION (3-126)”.
If fan reverse operation is performed while the aftertreatment
devices regeneration pilot lamp and the KDPF soot accumula-
tion caution lamp are lit, the accumulated soot may not be
burnt sufficiently and the filtering function may not be improved.
When these monitors are lit, wait until they go out and then per-
form fan reverse operation.
For the operation to reverse the fan rotation, see “MACHINE SETTINGS (3-72)”.
Two types of monitor display require the manual stationary regeneration, depending on the level of urgency.
If the lock lever is in LOCK position, the manual stationary regeneration may start automatically to protect the
KDPF.

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OPERATION EXPLANATION OF COMPONENTS

NOTICE
Do not stop engine when the aftertreatment devices regeneration is activated.
When stopping the engine, stop the aftertreatment devices regeneration first according to “PROCE-
DURE FOR AFTERTREATMENT DEVICES REGENERATION DISABLE SETTING (3-129)”, then keep en-
gine running at low idle for approximately 5 minutes, and stop engine.
When the Action level “L03” lights up in red, and the KDPF
soot accumulation caution lamp (2) lights up in red, engine
power deration is activated. To restore engine power, it is
necessary to perform “PROCEDURE FOR MANUAL STA-
TIONARY REGENERATION”.
If soot accumulated in the KDPF exceed the defined level
without performing “PROCEDURE FOR MANUAL STA-
TIONARY REGENERATION”, the Action level “L04” lights
up in red. Stop the machine immediately and ask your Ko-
matsu distributor.

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EXPLANATION OF COMPONENTS OPERATION

REMARK
• Soot accumulation level (4) can be checked with the “Af-
tertreatment Devices Regeneration” screen. Press function
switch F6 on the standard screen to display the “Aftertreat-
ment Devices Regeneration” screen of the user menu.
• Since the soot in the filter of KDPF can be burnt by the
high-performance catalyst and high-temperature exhaust
heat, the soot accumulation quantity may decrease even if
the regeneration is not performed, depending on the oper-
ating condition.
• Even when the soot accumulation level is low, the auto-
matic regeneration may be performed and the manual sta-
tionary regeneration may be requested to protect the sys-
tem. In particular, if engine is kept running with no load, the
regeneration frequency may increase, but this is not a fail-
ure.
• Even just after the regeneration is completed, the soot ac-
cumulation level may not be “0”. This is caused by the ac-
cumulated noncombustible material in the exhaust gas and
is not a failure.
• Since noncombustible matter which cannot be burnt by the
regeneration is accumulated in the filter of KDPF, the filter
needs to be cleaned or replaced at regular intervals. For
details, see “METHOD FOR CLEANING KDPF (4-88)”.
• The engine speed or engine sound may change during or
after the regeneration. This is caused by the control for
better regeneration and this is not a failure.
• The smell of the exhaust gas is different from that of the
conventional diesel engine because of the exhaust gas fil-
tering function.
• White smoke may be discharged for a short time just after
the engine is started or during the regeneration in the cold
season, but this is not a failure.
• Komatsu recommends using Komatsu genuine engine oil
for KDPF. If engine oil other than Komatsu genuine oil for
KDPF is used, it may shorten cleaning interval of KDPF fil-
ters, adversely affect the engine such as deteriorated oil
may reduce lubricating function, and it may cause failure.
In addition, the regeneration interval may be shortened
and the fuel consumption may increase. For details of the
genuine oil, see “RECOMMENDED FUEL, COOLANT,
AND LUBRICANT (7-5)”.

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OPERATION EXPLANATION OF COMPONENTS

REMARK
If heavy-duty operation is performed for more than 30 minutes
with the fuel control dial between Low idle (MIN) position and
High idle (MAX) position, soot is accumulated much and action
level “L03” may be displayed. However, this does not indicate
abnormality.
After performing manual stationary regeneration, turn the fuel
control dial to a point above the midpoint between Low idle
(MIN) position and High idle (MAX) position to continue the op-
eration.

When the degree of emergency is low

• If KDPF soot accumulation caution lamp (2) lights up in
yellow (action level (3): “L01”), screen (A) is displayed first.
• The action level goes out 2 seconds later and the screen
changes to standard screen (B).
• If the lock lever is set to LOCK position or all the work
equipment control levers are set in NEUTRAL, the screen
changes to “Aftertreatment Devices Regeneration” screen
(C) after 3 seconds only the first time. If the manual sta-
tionary regeneration is not performed, the screen returns
to standard screen (B) after 30 seconds.
Then, if the accumulated soot does not decrease, “After-
treatment Devices Regeneration” screen (C) is displayed
for 30 seconds every 2 hours.
• If KDPF soot accumulation caution lamp (2) lights up in
yellow, stop the machine in a safe place after finishing the
work and perform the manual stationary regeneration.

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EXPLANATION OF COMPONENTS OPERATION

When the degree of emergency is high

• KDPF soot accumulation caution lamp (2) lights up in red
and the action level “L03” lights up in red (3).
• If the lock lever is set to LOCK position or all the work
equipment control levers are set in NEUTRAL, the screen
changes to “Aftertreatment Devices Regeneration” screen
(C) after 3 seconds. Then, “Aftertreatment Devices Regen-
eration” screen (C) and standard screen (D) are automati-
cally displayed alternately according to the lever operation,
until the manual stationary regeneration is performed.
• If KDPF soot accumulation caution lamp (2) lights up in
red, immediately stop the machine in a safe place and per-
form the manual stationary regeneration.

PROCEDURE FOR MANUAL STATIONARY REGENERATION

k CAUTION
Exhaust gas temperature may increase higher than the
previous models during the aftertreatment devices regen-
eration. Avoid getting near the exhaust pipe outlet and
around the Aftertreatment devices to prevent being burnt.
Also, keep combustible materials away from the exhaust
pipe outlet and around the Aftertreatment devices to pre-
vent a fire.

The manual stationary regeneration can be performed while

KDPF soot accumulation caution lamp (1) is lit.
1. Move the machine to a safe place and stop it with engine
running.
2. Check that there is no person or combustible matter
around the machine (particularly in the direction of the ex-
haust gas flow).
3. Set the lock lever to LOCK position (L).

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OPERATION EXPLANATION OF COMPONENTS

4. Set the fuel control dial to Low idle (MIN) position.

5. Press function switch F6 to display the “Aftertreatment De-

vices Regeneration” screen.

6. Select manual stationary regeneration, check again that there is no person or combustible material around
the machine, then press function switch F6.
If the machine needs to be moved again to secure safety, move it to a safe place and repeat the procedure
from step 1.
REMARK
After function switch F6 is pressed in step 6, the screen
shown in the figure may be displayed. This indicates that
the operations in steps 1 to 4 were not performed correctly
or there is trouble other than KDPF soot accumulation ab-
normality. Check that the engine is running normal, the
lock lever is in LOCK position (L), and the fuel control dial
is in Low idle (MIN) position, then repeat the procedure
from step 6.
If the manual stationary regeneration still cannot be per-
formed, return to the standard screen, press function
switch F5 to check the contents of other occurring trou-
bles, stop the work and perform inspection and mainte-
nance.

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EXPLANATION OF COMPONENTS OPERATION

REMARK
• The explanation of the manual stationary regeneration
is displayed in 3 parts on the monitor panel. When
function switch F6 is pressed, the regeneration can be
started immediately, regardless of which part is dis-
played. When function switch F5 is pressed, the
screen returns to the standard screen.
• If no monitor switch is operated for 30 seconds, the
explanation of the manual stationary regeneration dis-
appears and the screen returns to the standard
screen. At this time, to display the explanation of the
manual stationary regeneration again, press function
switch F6 on the standard screen to display the “After-
treatment Devices Regeneration” screen.

7. This screen is displayed during the manual stationary re-

generation. It may take more than 40 minutes to complete
the manual stationary regeneration. Do not touch any
switch on the screen or operate fuel control dial until the
regeneration is completed and the standard screen ap-
pears again.

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OPERATION EXPLANATION OF COMPONENTS

REMARK
• The progress of the manual stationary regeneration
performed when soot is accumulated can be checked
by the number of lighting lamps of soot accumulation
level (4). The manual stationary regeneration starts at
soot accumulation level “4” or higher and finishes
when all the level lamps go out.
• The time required for the manual stationary regenera-
tion depends on the soot deposition level or the ambi-
ent temperature when it is started. If the regeneration
starts at soot accumulation level “6” or higher, it may
take approximately 2 hours to finish.
• The manual stationary regeneration for protection of
the system may start even when the soot accumula-
tion level is “0” to “3”. In this case, the soot accumula-
tion level may not decrease, but this is not trouble.
The progress is not displayed on the monitor during
this regeneration. It is completed in approximately 10
minutes.
• If the lock lever or fuel control dial is operated during
the manual stationary regeneration, the regeneration
is stopped automatically. Return the lock lever to
LOCK position (L) and return the fuel control dial to
Low idle (MIN) position, then repeat the procedure
from step 6.
• If the machine needs to be moved during the manual
stationary regeneration, stop the regeneration tempo-
rarily and move the machine, referring to the after-
treatment devices regeneration disable and cancel
procedures described below.
When restarting the manual stationary regeneration,
secure the safety of the machine and around it, then
cancel the regeneration disable.
8. After the manual stationary regeneration is completed, the screen automatically returns to the standard
screen.

PROCEDURE FOR AFTERTREATMENT DEVICES REGENERATION DISABLE

SETTING
If there is combustible material around the machine and the active regeneration that increases the exhaust tem-
perature must not be performed, the automatic active aftertreatment regeneration can be disabled. Also, the re-
generation in progress can be stopped.
NOTICE
Even if the regeneration is disabled, KDPF soot accumula-
tion caution lamp (1) lights up if soot is accumulated and
the manual stationary regeneration is required. If KDPF
soot accumulation caution lamp lights up, move the ma-
chine to a safe place and perform manual stationary regen-
eration.
If the operation is continued without performing the man-
ual stationary regeneration, it may cause the failure of
KDPF or the engine.

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EXPLANATION OF COMPONENTS OPERATION

While regeneration is not being performed: Setting for the regeneration disable
1. (When the aftertreatment devices regeneration pilot lamp
is not displayed on the standard screen)
Press function switch F6 on the standard screen.

2. Operate function switches F1 and F2 to select “Aftertreat-

ment Devices Regeneration” menu (C) to display “After-
treatment Devices Regeneration” screen.

3. Select the regeneration disable and press function switch

F6, then the regeneration function is disabled and the re-
generation cannot be performed.

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OPERATION EXPLANATION OF COMPONENTS

REMARK
• When the regeneration is disabled, the aftertreatment devi-
ces regeneration disable pilot lamp (2) is displayed with
hatch on the standard screen.
• The setting of the regeneration disable is canceled by turn-
ing starting switch to OFF position. When the automatic re-
generation needs to be kept disabled, perform the above
procedure each time you start the engine.
• During the regeneration to protect the system, even if the
regeneration disable is set, the regeneration pilot lamp (3)
may light up, but this does not indicate abnormality. Also,
during the regeneration to protect the system, the regener-
ation disable cannot be operated.
• When the regeneration is performed to protect the system,
the exhaust temperature is lower than that of when the re-
generation is performed to burn soot, and is almost the
same level as the normal exhaust gas temperature.

While regeneration is being performed: Regeneration is disabled

1. (When the aftertreatment devices regeneration pilot lamp
(3) is lit on the standard screen)
When switch F6 is pressed on the standard screen, “After-
treatment Devices Regeneration” screen is displayed.

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EXPLANATION OF COMPONENTS OPERATION

2. Select the regeneration disable, press function switch F6,

and the regeneration stops.
REMARK
The regeneration performed to protect the system may not
be stopped, but this is not a failure.

PROCEDURE FOR CANCEL OF AFTERTREATMENT DEVICES REGENERATION

DISABLE SETTING
k CAUTION
When canceling the regeneration disable, move the machine to a safe place and check that there is no
person or combustible matter around the machine, and start the cancel operation.

1. When switch F6 is pressed on the standard screen, “After-

treatment Devices Regeneration” screen is displayed.
(If the screen is not displayed, operate function switches
F1 and F2 to display “Aftertreatment Devices Regenera-
tion” screen.

2. Select Cancel of the regeneration disable and press func-

tion switch F6, and the regeneration disable is canceled.
If soot accumulation level (4) is lit 3 or more, the regenera-
tion is started automatically.
REMARK
• When canceling the regeneration disable, set the lock
lever to LOCK position and set the fuel control dial to
Low idle (MIN) position, then cancel the regeneration
disable.
• The regeneration disable setting is also canceled by
turning the starting switch to OFF position to stop the
engine.

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OPERATION EXPLANATION OF COMPONENTS

Komatsu Closed Crankcase Ventilation (KCCV)

KCCV is a device to clean the gas discharged from the engine
crankcase with the filter element and return it to the engine air
intake system.
NOTICE
• The KCCV filter element needs to be replaced every
2000 hours. For details of replacement, see “METHOD
FOR REPLACING KCCV FILTER ELEMENT (4-79)”.
• If the engine is operated without KCCV filter element
or if a filter element other than the Komatsu genuine
element is used, the engine sucks oil and foreign ma-
terial which can cause a failure. Always install Komat-
su genuine KCCV filter element.
• The filter element cannot be flushed. Never reuse the
filter element. Even if it is cleaned, its filtering perform-
ance may decrease and it can cause an engine failure.

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EXPLANATION OF COMPONENTS OPERATION

HANDLE UREA SCR SYSTEM WARNING

Urea SCR system is a device which converts toxic nitrogen oxides (NOx) in the exhaust gas into harmless nitro-
gen and water. By spraying DEF into the exhaust gas, it decomposes and hydrolyzes to form ammonia (NH3)
and the ammonia selectively reacts with nitrogen oxides for the conversion to nitrogen and water.
The Komatsu Urea SCR System continuously monitors its operation conditions and stores information on inap-
propriate operations including malfunctions. The information is used for system diagnostics and also for Induce-
ment required by the authorities on engine systems that use Urea SCR systems. Inducement is intended for the
operator to take prompt actions to maintain and correct inappropriate behaviors of Urea SCR systems by utiliz-
ing visible and audible alerts, and engine power derate in addition. Alerts in Inducement of the Komatsu Urea
SCR System progresses step by step starting from visual indications on the machine monitor and audible
sounds to engine power derate to avoid getting into unsafe conditions.
The Komatsu Urea System also monitors recurrences of abnormalities of the system. Inducement in the recur-
rences is activated when another abnormality occurs within 40 hours after the first abnormality is fixed.
The Komatsu’s Urea is composed of two major systems, which are the DEF system and the SCR catalyst Ass’y.
DEF is supplied from DEF system into the exhaust system.
DEF system consist of DEF tank (1), DEF hose (2), DEF pump
(3), and DEF injector (4). SCR Ass’y is indicated by (5).
In the event that indications of potential degradation of nitrogen
oxides conversion efficiency are detected, the active regenera-
tion is triggered to rejuvenate Urea SCR system even if the
amount of soot accumulated in the KDPF has not reached to
the regeneration thresholds.
For details of Aftertreatment Devices Regeneration, see “HAN-
DLE Komatsu Diesel Particulate Filter (KDPF) (3-122)”.

k WARNING
Fill ONLY DEF into DEF tank. Foreign material in the DEF
system or urea deposits caused by evaporation may hin-
der operation of the devices.

NOTICE
• Do not disassemble any devices of the DEF System
other than the filter for change. Do not modify any de-
vices of the DEF System.
• Paint may cause deterioration of the devices. When
painting the surrounding areas, take care not to get
any paint on the injector and the supply pump.
• Always use DEF that conforms to the quality standard.
If any additional additive agents or water is mixed in
DEF and that mixture is used, the devices will not
function properly, and conformance to the exhaust gas
regulations will be lost. In addition, it may cause fail-
ures in the engine system. If DEF out of the standard
is filled or used by mistake, contact your Komatsu dis-
tributor.
About the operation of Urea SCR system
The Urea SCR System automatically starts operating as soon as the engine is started.
Even after the engine starting switch is turned to the OFF position, the devices will still be in operation for sever-
al minutes to purge any DEF in the lines, the injector and the supply pump back to the DEF tank. It does not
indicate any abnormality. When DEF has been returned to the tank, the devices stop.

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Do not turn OFF the battery disconnect switch while the devices are still in operation. When the devices com-
plete their shutdown process, the system operating lamp will go out, and the battery disconnect switch may be
disconnected.
About the operation in cold weather
DEF freezes at –11 °C {12.2 °F} .
Urea SCR system is equipped with a heating system to thaw frozen DEF once it is frozen, for example, during
parking and to prevent DEF from freezing during operation.
In case DEF freezes during parking, once the engine starts running the heating system automatically starts pro-
viding heat to thaw frozen DEF. The pump and the injector start working only after a proper amount of DEF is
thawed. This may be noticed as a delay in the start of functioning of the pump and the injector.
The heating system is also activated automatically during operation to prevent DEF from freezing whenever the
ambient temperature drops below a certain threshold where DEF in the system may freeze. In the event that the
ambient temperature drops further than a temperature where the heating system is capable of maintaining fluidi-
ty of DEF, the DEF system automatically starts purging the remaining DEF back to the tank and stops pumping
and injection while heating continues. Once the ambient temperature rises above a temperature where DEF
system becomes functional, it resumes operation automatically.
Short duration of white plume given off from the tail pipe may be visible at and shortly after engine start-up in
cold weather, but this is not malfunction.
Inducement strategy when the DEF tank Level becomes low
When the amount of DEF in the tank goes low, the Inducement strategy will be activated.
If Inducement starts, add DEF to the DEF tank immediately.
The DEF level caution lamp (1) on the monitor lights up, the audible alert starts, and the Action level is dis-
played, and Inducement strategy is activated. Inducement strategy includes engine output deration, speed limi-
tation, or other warning actions intend to prompt the operator to maintain or repair SCR system.
The Inducement strategy progressed in 5 levels from Warning, Escalated Warning, Mild inducement, Severe In-
ducement and Final Inducement.
The DEF level caution lamp (1) on the machine monitor will
light up, audible alert will start, then Action level will be dis-
played on the machine monitor, and engine power will be derat-
ed in steps.
In Action Level “L03 (Mild Inducement)” and “L04 (Severe In-
ducement and Final Inducement)” engine power will be derat-
ed. When Action Level “L03” or “L04” is displayed, move the
machine to a safe place and add DEF.
If operation is continued further without adding DEF at Severe
Inducement, engine speed will be fixed at low idle. (Final In-
ducement)
The content of the warning can be checked on the “SCR Information” screen of the user menu.
Perform the following procedure.
Press F6 on the standard screen to display the “SCR Informa-
tion” screen of the user menu.
If either the lock lever is set to LOCK position or the travel lever
and control levers are in NEUTRAL position for over 3 sec-
onds, “SCR Information” screen of the user menu will pop up
automatically while the Urea SCR system is in Inducement.

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“SCR Information” screen displays the DEF level caution lamp

(1), the DEF level gauge (2), information on the Urea SCR Sys-
tem condition (3), and the current status of Inducement (4).
If Inducement starts, stop the machine in a safe place and add
DEF.
Once the audible alert starts, “The buzzer cancel switch” does
not work unless DEF is added.

• Warning:
2 gradations of the DEF level gauge light up in the red
range.
The DEF level caution lamp (1) lights up in red.
No audible alert.
No Action level is displayed.
Press F6 to display the “SCR Information” screen.

Inducement status (4): “1 DEF low level warning appears.”

Add DEF to the DEF tank immediately.

• Escalated Warning:
The audible alert sounds in repetition of “three beeps and
a pause”.
2 gradations of the DEF level gauge light up in the red
range.
DEF level caution lamp (1) lights up in red.
No Action level is displayed.
Press F6 to display the “SCR Information” screen.

Inducement status (4): “2 Without treatment, engine power

will be derated.”
Add DEF to the DEF tank immediately.

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OPERATION EXPLANATION OF COMPONENTS

• Mild Inducement:
The audible alert sounds in short and sharp beeps.
1 gradation of the DEF level gauge light up in red.
The DEF level caution lamp (1) lights up in red.
Action Level “L03” is displayed in red (5).
Press F6 to display the “SCR Information” screen.

Inducement status (4): “3 Engine power is under deration.”

Add DEF to the DEF tank immediately.

• Severe Inducement:
The audible alert sounds in continuous beep.
No gradation of the DEF level gauge lights up.
The DEF level caution lamp (1) lights up in red.
The Action level “L04” is displayed in red (5).
Press F6 to display the “SCR Information” screen.
When all gradations of the DEF level gauge go off, DEF re-
filling amount is approximately 39 ℓ {10.3 U.S.Gal}  to fill up
the DEF tank.

Inducement status (4): “4 Engine power is under heavy de-

ration.”
The remaining time (Hour and minute) to the Final Induce-
ment is displayed in the column (6) of the “SCR Informa-
tion” screen. If no DEF is added during the “Severe In-
ducement”, Inducement advances to “Final Inducement”
within 1 hour. At “Final Inducement”, engine speed is fixed
at low idle.

Engine power can be restored temporarily from power derate. This engine power restoration works only
when the Inducement status is “Severe Inducement” and relieves back temporarily to the power deration of
the “Mild Inducement”. The operator can restore engine power through the machine monitor. For the engine
power restoration procedure, refer to the section of “Temporary Restoration from Inducement” in this man-
ual. Once in “Severe Inducement” and it becomes necessary to restore engine power, use the engine pow-
er restoration function to move the machine to a safe place and add DEF.

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EXPLANATION OF COMPONENTS OPERATION

• Final Inducement:
1 hour after “Severe Inducement” starts, advancing to “Fi-
nal Inducement”.
The audible alert sounds in continuous beep.
No gradation of the DEF level gauge light up.
The DEF level caution lamp (1) lights up in red.
Action level “L04” is displayed in red (5).
Press F6 to display the “SCR Information” screen.

Inducement status (4): “5 Engine is running at low idle.”

Engine speed is fixed at low idle to disable practical ma-
chine operation.
Add DEF to the DEF tank immediately.
In case the system does not come out of Inducement even
if DEF is added in the tank, contact your Komatsu Distribu-
tor.

Inducement strategy when abnormalities are detected in the Urea SCR System
devices (Except abnormalities in the KDPF system)
If any abnormality is detected in the DEF quality or in the Urea SCR system, the Inducement strategy is activat-
ed.
The inducement strategy progresses in 5 levels, “Warning”,
“Escalated Warning”, “Mild Inducement”, “Severe Inducement”
and “Final Inducement”. The Inducement strategy includes vis-
ual alert by the DEF caution lamp, the KDPF system caution
lamp or the Engine system caution lamp (1), and Action Level
displayed on the machine monitor (2), and the audible alert by
a buzzer and stepwise engine power deration that advances to
speed limitation to low idle. Engine power deration starts with
Action Level “L03 (Mild Inducement)” and advances to further
deration when “L04 (Severe Inducement and Final Induce-
ment)” is displayed. Once the system advances to “Final In-
ducement”, the engine speed is fixed to low idle. If “L03” is dis-
played, move the machine to a safe place and contact your Komatsu distributor.
The content of the warning can be checked on the “SCR Information” screen of the user menu.
Perform the following procedure.
Press F6 on the standard screen to display the “SCR Informa-
tion” screen of the user menu.
If either the lock lever is set to LOCK position or the travel lever
and control levers are in NEUTRAL position for over 3 sec-
onds, “SCR Information” screen of the user menu will pop up
automatically while the Urea SCR system is in Inducement.

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OPERATION EXPLANATION OF COMPONENTS

“SCR Information” screen displays remaining time to the next

Inducement status in the column (5), and information on the
Urea SCR System condition (3), and the current status of In-
ducement (4).

• Warning:
No audible alert.
The DEF system caution lamp (1) lights up in yellow.
Note: Action Level “L01” once shows up in yellow on the
machine monitor (2) for 2 seconds and goes out.
Press F6 to display the “SCR Information” screen.

“SCR Information” screen message (4): “1 Please inspect

and maintain SCR system.”
Move the machine to the safe place and contact your Ko-
matsu Distributor.
If operation continues for 1 hour after “Warning” started
without taking any actions instructed by the Action Level
table, Inducement advances to “Escalated Warning”.

• Escalated Warning:
The audible alert sounds in repetition of “three beeps and
a pause”.
The DEF system caution lamp (1) lights up in yellow.
If operation continues for 1 hour after “Warning” started
without taking any actions instructed by the Action Level
table, Inducement advances to “Escalated Warning”.
Press F6 to display the “SCR Information” screen.

“SCR Information” screen message (4): “2 Without treat-

ment, engine power will be derated.”
Move the machine to the safe place and contact your Ko-
matsu Distributor.
The duration of “Escalated Warning” is 1 hour. The remain-
ing time (Minutes) to “Mild Inducement” is displayed in the
column (5) of the “SCR Information” screen.
In “Mild Inducement”, engine performance will be derated.

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EXPLANATION OF COMPONENTS OPERATION

• Mild Inducement:
The audible alert sounds in short and sharp beeps.
The DEF system caution lamp (1) lights up in red.
Action level “L03” lights up in red at action level display (2)
and stays on.
Press F6 to display the “SCR Information” screen.

“SCR Information” screen message (4): “3 Engine power is

under deration.”
Due to the engine power deration, capability of the ma-
chine will be limited.
Move the machine to the safe place and contact your Ko-
matsu Distributor.
The duration of “Mild Inducement” is 1 hour. The remaining
time (Minutes) to “Severe Inducement” is displayed in the
column (5) of the “SCR Information” screen.
In “Severe Inducement”, engine power will be derated fur-
ther.
• Severe Inducement:
The audible alert sounds in continuous beep.
The DEF system caution lamp (1) lights up in red.
Action level “L04” lights up in red (2).
Press F6 to display the “SCR Information” screen.

“SCR Information” screen message (4): “4 Engine power is

under heavy deration.”
Due to the further deration of engine power, capability the
machine will be limited further.
Move the machine to the safe place and contact your Ko-
matsu Distributor.
The duration of “Severe Inducement” is 1 hour. The re-
maining time (Minutes) to “Final Inducement” is displayed
in the column (5) of the “SCR Information” screen.
In “Final Inducement”, engine speed will be fixed at low
idle.
Engine power can be restored temporarily from power derate. If Inducement advances to “Severe Induce-
ment” and it becomes necessary to restore engine power, use the engine power restoration function to
move the machine to a safe place and contact your Komatsu distributor. This engine power restoration
works only when the Inducement status is “Severe Inducement” and relieves back temporarily to the power
deration of “Mild Inducement”. The operator can restore engine power through the machine monitor. For the
engine power restoration procedure, refer to the section of “Temporary Restoration from Inducement” in this
manual.

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• Final Inducement:
The audible alert sounds in continuous beep.
The DEF system caution lamp (1) lights up in red.
Action level “L04” lights up in red (2) and stays on.
Press F6 to display the “SCR Information” screen.

“SCR Information” screen message (4): “5 Engine is run-

ning at low idle.”
Engine speed is fixed at low idle to disable practical ma-
chine operation.
Move the machine to a safe place and contact your Ko-
matsu Distributor.

Inducement strategy when abnormality is found in the KDPF System by the

Urea SCR system
If any abnormality is detected in the KDPF System through the Urea SCR system, the Inducement strategy is
activated.
The inducement strategy progresses in 5 levels, “Warning”,
“Escalated Warning”, “Mild Inducement”, “Severe Inducement”
and “Final Inducement”. The Inducement strategy includes vis-
ual alert by the KDPF System caution lamp (1), DEF system
caution lamp (2), and Action Level displayed on the machine
monitor (3), audible alert by a buzzer and stepwise engine
power deration that advances to speed limitation to low idle.
Engine power deration starts with Action Level “L03 (Mild In-
ducement)” and advances to further deration when “L04 (Se-
vere Inducement and Final Inducement)” is displayed. Once
the system advances to “Final Inducement”, the engine speed
is fixed to low idle. If “L03” is displayed, move the machine to a
safe place and contact your Komatsu distributor.
The content of the warning can be checked on the “SCR Information” screen of the user menu.
Perform the following procedure.
Press F6 on the standard screen to display the “SCR Informa-
tion” screen of the user menu.

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EXPLANATION OF COMPONENTS OPERATION

If either the lock lever is set to LOCK position or the travel lever
and control levers are in NEUTRAL position for over 3 sec-
onds, “SCR Information” screen of the user menu will pop up
automatically while the Urea SCR system is in Inducement.
“SCR Information” screen displays remaining time to the next
Inducement status in the column (6), and information on the
Urea SCR System condition (4), and the current status of In-
ducement (5).

• Warning:
The audible alert sounds in short and sharp beeps.
The KDPF system caution lamp (1) lights up in red.
The action level “L03” lights up in red at action level dis-
play (3).
Press F6 to display the “SCR Information” screen.

“SCR Information” screen message (5): “1 Please inspect

and maintain SCR system.”
Engine power is derated.
Move the machine to the safe place and contact your Ko-
matsu Distributor.
If operation continues for 1 hour after “Warning” started
without taking any actions instructed by the Action Level
table, Inducement advances to “Escalated Warning”.

• Escalated Warning:
The audible alert sounds in repetition of “three beeps and
a pause”.
The KDPF system caution lamp (1) lights up in red.
The DEF system caution lamp (2) lights up in yellow.
The action level “L03” lights up in red at action level dis-
play (3).
Press F6 to display the “SCR Information” screen.

“SCR Information” screen message (5): “2 Without treat-

ment, engine power will be derated.”
Move the machine to the safe place and contact your Ko-
matsu Distributor.
The duration time of “Escalated Warning” is 1 hour. The re-
maining time (Minutes) to “Mild Inducement” is displayed in
the column (6) of “SCR Information” screen.
In “Mild Inducement”, engine performance will be derated.

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OPERATION EXPLANATION OF COMPONENTS

• Mild Inducement:
The audible alert sounds in short and sharp beeps.
The KDPF system caution lamp (1) lights up in red.
DEF system caution lamp (2) lights up in red.
The action level “L03” lights up in red at action level dis-
play (3).
Press F6 to display the “SCR Information” screen.

“SCR Information” screen message (5): “3 Engine power is

under deration.”
Due to the reduction of engine power, the machine normal
operation will be limited.
The duration time of “Mild Inducement” is 1 hour. The re-
maining time (Minutes) to “Severe Inducement” is dis-
played in the column (6) of “SCR Information” screen.
In “Severe Inducement”, engine power will be derated fur-
ther.
Move the machine to the safe place and contact your Ko-
matsu Distributor.
• Severe Inducement:
The audible alert sounds in continuous beep.
The KDPF system caution lamp (1) lights up in red.
DEF system caution lamp (2) lights up in red.
Action level “L04” lights up in red at action level display (3).
Press F6 to display the “SCR Information” screen.

“SCR Information” screen message (5): “4 Engine power is

under heavy deration.”
Due to the further deration of engine power, capability the
machine will be limited further.
The duration time of “Severe Inducement” is 1 hour. The
remaining time (Minutes) “Final Inducement” is displayed
in the column (6) of “SCR Information” screen.
In “Final Inducement”, engine speed will be fixed at low
idle.

Engine power can be restored temporarily from power derate. This engine power restoration works only
when the Inducement status is “Severe Inducement” and relieves back temporarily to the power deration of
“Mild Inducement”. The operator can restore engine power through the machine monitor. For the engine
power restoration procedure, refer to the section of “Temporary Restoration from Inducement” in this man-
ual. If Inducement advances to “Severe Inducement” and it becomes necessary to restore engine power,
use the engine power restoration function to move the machine to a safe place and contact your Komatsu
distributor.

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EXPLANATION OF COMPONENTS OPERATION

• Final Inducement:
The audible alert sounds in continuous beep.
The KDPF system caution lamp (1) lights up in red.
The DEF system caution lamp (2) lights up in red.
Action level “L04” lights up in red (3) at action level display.
Press F6 to display the “SCR Information” screen.

“SCR Information” screen message (5): “5 Engine is run-

ning at low idle.”
Engine speed is fixed at low idle to disable practical ma-
chine operation.
Move the machine to a safe place and contact your Ko-
matsu Distributor.

Temporary Restoration from Inducement

Temporary Restoration from Inducement is one of the Inducement strategies allowed to be included in Urea
SCR systems.
In case the Urea SCR system advances to “Severe Inducement”, engine power is derated heavily. This may
cause difficulties of moving the machine to a safe place for adding DEF or troubleshooting and correcting abnor-
malities of the Urea SCR system. For temporary remedies from these difficulties the operator can restore engine
power for a short time to the deration of “Mild Inducement” through the machine monitor. Note that “Temporary
Restoration from Inducement” does not regain full engine power.
“Temporary Restoration from Inducement” can be activated only when the Urea SCR system is in “Severe In-
ducement”. The maximum duration is limited to 30 minutes in each restoration operation, and 3 operations are
allowed, but “Temporary Restoration from Inducement” is turned off whenever the system advances to “Final In-
ducement” even if either 30 minutes or 3 operations are not used up.
All the abnormalities of the Urea SCR system need to be corrected to regain another restoration capability.
If all the abnormalities of the Urea SCR system are not corrected when the system is in “Severe Inducement”,
the system advances to “Final Inducement” in 1 hour after “Severe Inducement” started and engine speed will
be fixed to low idle to disable practical machine operation. If the system advances to “Severe Inducement”, uti-
lize “Temporary Restoration from Inducement” immediately.
Procedure to activate “Temporary Restoration from Inducement”.
1. Press F6 to display the “SCR Information” screen when
the Standard screen is on, only when the Urea SCR sys-
tem is in “Severe Inducement”.

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OPERATION EXPLANATION OF COMPONENTS

2. Press F6 to display the menu windows popping up in the

bottom half of the “SCR Information”.
The menu windows popping up in the bottom half of the
“SCR Information” screen alternate every 15 seconds as
shown in the graphics A and B.

3. Press F6 while the pop-up menu screen B is displayed.

The “Engine power Recovery” window will be displayed.
If F6 is not pressed for 30 seconds, “ Standard Screen” will
be displayed, and start again by pressing F6.
The remaining number of operations of Temporary Resto-
ration from inducement is displayed in the column (1) of
the pop-up menu window B.

4. Press F6 while the “Engine power Recovery” window is

displayed.
Temporary Restoration from Inducement is activated and
engine power deration is relieved to the deration of “Mild
Inducement” for the maximum of 30 minutes as long as
there is sufficient remaining time to “Final Inducement”.
Note that whenever Inducement advances to “Final In-
ducement” Temporary Restoration from Inducement will be
turned off.

The remaining time (minutes/seconds) of “Temporary Re-

storation from Inducement” is displayed in the column (2)
on the “SCR Information” screen.

If it is decided NOT to activate “Temporary Restoration from Inducement” after having progressed to the “Engine
Power Recovery” window, follow the steps explained in this section.

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EXPLANATION OF COMPONENTS OPERATION

To deactivate “Temporary Restoration from Inducement” function.

1. Press F5 while the “Engine Power Recovery” window is
displayed.
This procedure is split from procedure 4 in “Temporary Re-
storation from Inducement”.

“SCR Information” screen is displayed.

2. Move any operating lever to display “Standard Screen” is

displayed.
“Temporary Restoration from Inducement” is deactivated.

Inducement Strategy for abnormalities recurrences within 40 hours

The Urea SCR system continuously monitors its operation conditions and stores information on inappropriate
operations including malfunctions. The stored information is utilized to monitor recurrences of abnormalities,
“Abnormality Recurrence Counter”. “Abnormality Recurrence Counter” is required by the U.S. Environmental
Protection Agency. The recurrence monitoring spans 40 hours and it monitors the abnormalities that trigger In-
ducement other than the amount of DEF in the tank.
If another abnormality/abnormalities is detected within 40 hours after the previous abnormalities were corrected,
regardless of the level of the previous Inducement and whether the new abnormality/abnormalities is the same
as the previous ones or not, it is judged as a recurrence.
If a recurrence occurs, “Severe Inducement” will be activated. If this occurs, utilize “Temporary Restoration from
Inducement” and move the machine to a safe place, and contact your Komatsu distributor.
The duration of “Severe Inducement” in the recurrence is limited to 30 minutes. If the abnormalities are not cor-
rected while Inducement is in “Severe Inducement (30 minutes)”, Inducement will advance to “Final Inducement”
and engine speed will be fixed to low idle to disable practical machine operation.
Note that although maximum duration of the power restoration is 30 minutes and 3 operations are possible,
whenever Inducement advances to “Final Inducement”, “Temporary Restoration from Inducement” will be turned
off and its function will be held off till all the abnormalities are corrected.
To activate “Temporary Restoration from Inducement”, refer to the “Temporary Restoration from Inducement”
section in this manual.

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OPERATION EXPLANATION OF COMPONENTS

DEF FILTER
DEF filter is an filter element to clean DEF sucked from the
DEF tank by DEF pump, and to supply it to DEF injector.
NOTICE
• The DEF filter element needs to be replaced every
2000 hours. For details of the replacement procedure,
see “METHOD FOR REPLACING DEF FILTER (4-82)”.
• If the machine is operated without DEF filter attached,
or with the filter other than Komatsu genuine parts,
foreign materials may enter into DEF pump and DEF
injector which will cause failure of the machine. Never
operate the machine without DEF filter attached, nor
use the filter other than Komatsu genuine parts.
• DEF filter cannot be flushed. Flushing or regenerating
of it will degrade the performance of DEF filter, and will
contaminate DEF pump and DEF injector which will
cause the failure of the machine. Never reuse the DEF
filter.

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EXPLANATION OF COMPONENTS OPERATION

KOMTRAX
KOMTRAX equipment may not be mounted on machines for some countries or regions.

OUTLINE OF KOMTRAX
KOMTRAX is a system that remotely manages the machines equipped with the KOMTRAX device by using sat-
ellite communication or portable radio communication.
Each customer can check the machine information of various types (machine position information, etc.) in the
web screen of a personal computer
The machine information you can check with KOMTRAX includes the following; “Machine position”, “service me-
ter”, “working hours”, “fuel consumption”.
Your Komatsu distributor uses the above machine information for supply of service to the customers, improve-
ment of our products and service, etc.
If you want to use KOMTRAX, you are required to register to your Komatsu distributor.

k WARNING
• Never disassemble, repair, modify, or move the communications terminal, antenna, or cables. This
may cause failure or fire on the KOMTRAX equipment or the machine itself. (Your Komatsu distribu-
tor will perform removal and installation of KOMTRAX.)
• For anyone wearing a pacemaker, make sure that the communications antenna is at least 22 cm {at
least 8.7 in}  from the pacemaker. The radio waves may have an adverse effect on the operation of
the pacemaker.
• Near the blasting jobsite, there may be a danger of unexpected explosion due to use of interactive
wireless communication device of KOMTRAX and resulting serious personal injury or death. Make
sure to operate the machine away from the blasting jobsite.
If you have to operate the machine within 12 m {within 39 ft 4 in} from the blasting jobsite or the
remote-controlled blasting device, the power supply cable of KOMTRAX must be disconnected in
advance. If you want to do this, ask your Komatsu distributor for disconnecting power supply cable
of KOMTRAX.
Also, if there are any requirements or regulations of the territory or country where the machine
equipped with this device is used, such requirements or regulations have a priority than this warn-
ing.
When checking for compliance with regulations, refer to the following KOMTRAX equipment satel-
lite communication specifications.
Rated transmit power: 5 to 10 W
Transmit frequency:148 to 150 MHz

PRECAUTIONS FOR USING KOMTRAX

• Even when the key in the starting switch of the KOMTRAX system is at OFF position, a small amount of
electric power is consumed.
It is recommended to run the engine periodically to charge the battery. When storing the machine for a long
period, see “PRECAUTIONS FOR LONG-TERM STORAGE (3-269)”.
• When using the battery disconnect switch, turn the starting switch to OFF position and turn the battery dis-
connect switch key to OFF position. Then, remove the key.
When the battery disconnect switch is turned to OFF position, it is possible to prevent power consumption
of the battery, but the functions of KOMTRAX stop at the same time.
For operation of the battery disconnect switch, see “BATTERY DISCONNECT SWITCH (3-120)”.
• Contact your Komatsu distributor before installing a top guard or other attachment that covers the cab roof.

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REMARK
The KOMTRAX device uses wireless communications, so it cannot be used inside tunnels, underground, inside
buildings, or in mountain areas where radio waves cannot be received. Even when the machine is outside, it
cannot be used in areas where the radio signal is weak or in areas outside the wireless communication service
area.

OBSERVANCE OF THE APPLICABLE LAWS AND REGULATIONS, EXEMPTION

The KOMTRAX equipment is a wireless device using radio waves, so it is necessary to obtain authorization and
conform to the laws of the country or territory where the machine equipped with KOMTRAX is being used. Ob-
serve the applicable laws and regulations of the country or region in which the machine is used.
Always contact your Komatsu distributor before exporting this machine equipped with KOMTRAX or using it in a
foreign country.
The KOMTRAX may already have been registered and used if the machine is purchased as second-hand. For
the registration and usage records of KOMTRAX, consult your Komatsu distributor.
If the machine has been lent out by the customer, the borrower or another third party may have been using the
KOMTRAX. Confirm with the lessor about using condition of KOMTRAX.
Komatsu may suspend KOMTRAX communication in the following cases.
• When Komatsu judges that KOMTRAX is used by an unregistered customer.
• When Komatsu judges that KOMTRAX is used in a country or region where its use is not authorized.
• In other cases that Komatsu or Komatsu distributor judges that it is necessary to suspend KOMTRAX com-
munication.
If you do not observe the above rules, neither Komatsu nor your Komatsu distributor shall be held liable for any
resulting impacts or damages.

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MACHINE OPERATIONS AND CONTROLS

CHECKS AND ADJUSTMENT BEFORE STARTING ENGINE
METHOD FOR WALK-AROUND CHECK
Before starting the engine, walk around the machine and look at the underside of chassis for anything unusual
like loose bolts and nuts, leakage of fuel, oil and coolant. Also check the condition of the work equipment and
the hydraulic system.
Check also for loose wiring, play, and accumulation of dust in places that get very hot and are exposed to ex-
tremely high temperatures.

k WARNING
Any combustible materials accumulated around the exhaust pipe, aftertreatment devices, turbocharger,
or other high temperature engine parts or the battery, and leakage of fuel or oil will cause the machine
to catch fire.
Check carefully, and if any abnormality is found, repair it or contact your Komatsu distributor.

Always perform the following inspections and cleaning every day before starting engine for the day's work.
1. Check for damage, wear, play in work equipment, cylinders, linkage, and hoses.
Check for cracks, excessive wear, play in work equipment, cylinders, linkage, and hoses. If any problem is
found, repair it.
2. Remove dirt and debris from around the engine, battery, and radiator.
Check for dirt accumulated around the engine and radiator. Also check for combustible material (dry leaves,
twigs, etc.) around the battery, exhaust pipe, aftertreatment devices, turbocharger, or other high tempera-
ture engine parts. If any dirt or combustible materials are found, remove them.
For removal of dirt from the radiator, see “METHOD FOR CHECKING AND CLEANING RADIATOR FINS,
OIL COOLER FINS, AFTERCOOLER FINS, AND AIR CONDITIONER CONDENSER FINS (4-59)”.
3. Check around the engine for coolant and oil leakage.
Check for oil leakage from the engine and coolant leakage from the cooling system. If any problem is found,
repair it.
4. Check the fuel line for leakage.
Check for leakage of fuel or damage to the hoses and tubes. If any problem is found, repair it.
5. Remove dirt and check DEF line for leakage.
Check for dirt accumulated around the DEF tank and clean blue DEF tank filler cap and surrounding area.
Check DEF tank, pump, injector, and hoses and their connections for leakage. If any problem is found, ask
your Komatsu distributor for repair.
6. Check the hydraulic equipment, hydraulic tank, hoses, and joints for oil leakage.
Check for oil leakage. If any problem is found, repair the place where the oil is leaking.
7. Check the undercarriage (track, sprocket, idler, guard) for damage, wear, loose bolts, or leakage of oil from
rollers.
If any problem is found, repair it.
8. Check the handrails and steps for problems and check the bolts for looseness.
If any problem is found, repair it. Tighten any loose bolts.
9. Check the gauges and monitor for problem.
Check for problem in the gauges and monitor in the operator's cab. If any problem is found, replace the
part. Clean off any dirt on the surface.

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REMARK
When cleaning the stains deposited on the monitor surface such as dusts, brush them off with a clean, soft
and dry cloth.
For sticky dirt such as oil, remove it with glass cleaner for family use on the market (weakly acid to weakly
alkaline, containing no abrasive), and then finish-wipe with a clean, soft, and dry cloth.
10. Check and clean the rearview mirrors.
Check for damage to the rear view mirror. If it is damaged, repair it. Clean the surfaces of the mirrors and
adjust the angle so that the area at the rear can be seen from the operator's seat.
11. Check the seat belt and mounting hardware.
Check the seat belt and mounting hardware for any abnormality. If any damage is found, ask your Komatsu
distributor to replace it with new one.
12. Check the bucket with hook (if equipped) for damage.
Check for damage to the hook, guide, and hook mount. If any problem is found, ask your Komatsu distribu-
tor for repair.
13. Check and clean the camera
Check the camera for any abnormality. If any problem is found, ask your Komatsu distributor for repair.
14. Removal dirt from around the aftertreatment devices.
Check for dirt and combustible materials (dry leaves, twigs, etc.) accumulated around the aftertreatment de-
vices. If any dirt or combustible materials are found, remove them.
15. Check around the aftertreatment devices for exhaust gas leakage.
Check the pipe connecting the turbocharger to the aftertreatment devices and also KDPF connections for
leakage of exhaust gas (and deposition of soot). If any problem is found, ask your Komatsu distributor for
repair.
16. Check around SCR for exhaust gas leakage.
Check the pipe between the KDPF and SCR and also the SCR connections for leakage of exhaust gas
(and urea deposit). If any problem is found, ask your Komatsu distributor for repair.

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METHOD FOR CHECKING BEFORE STARTING

Always check the items in this section before starting the engine each day.

METHOD FOR DRAINING WATER AND SEDIMENT FROM FUEL TANK

1. Prepare a container under drain hose to receive fuel.
2. Turn drain valve (1) to OPEN position (O) and drain all the
sediment and water accumulated at the bottom together
with fuel.
3. When only the clean fuel flows out, turn drain valve (1) to
CLOSE position (S).

METHOD FOR CHECKING WATER SEPARATOR, DRAINING WATER AND SEDI-

MENT
1. Open the engine hood.
The water separator forms one unit with fuel prefilter (1).
2. Check for water and sediment.
It is possible to judge the water level and amount of sedi-
ment by looking through transparent cup (2).
NOTICE
If the water inside transparent cup (2) freezes, check
that the frozen water has melted completely, then fol-
low the procedure to drain the water.
3. Put a container to receive the water under drain hose (3).
4. Loosen drain valve (4) and drain the water.
5. When fuel starts to drain from drain hose (3), tighten drain valve (4) immediately.
Tightening: 2.5 to 3.4 Nm {0.25 to 0.35 kgm,1.81 to 2.53 lbft}
If drain valve (4) is hard to move, adjust it so that it moves smoothly. For details, see “Adjustment of drain
valve”.

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METHOD FOR ADJUSTING DRAIN VALVE

1. Turn valve (6) at the bottom of the fuel tank to CLOSE po-
sition (S).
2. Place a container under the fuel prefilter cartridge to re-
ceive the fuel.

3. Loosen drain valve (4) to drain water and sediments from

transparent cup (2), and also drain all the fuel from fuel
prefilter cartridge (1).
4. Check that nothing more comes out from drain hose (3),
then remove drain valve (4).

5. Apply a suitable amount of grease to O-ring (7).

REMARK
When applying grease, be careful not to allow the grease
to adhere to water drain port (8) and threaded part (9) of
the drain valve.
6. Tighten drain valve (4) by hand until it contacts the bottom
of transparent cup (2).
7. Remove the fuel container.
8. Turn valve (6) at the bottom of the fuel tank to OPEN posi-
tion (O).
9. Bleed air from the fuel system.
REMARK
When bleeding air, see “METHOD FOR REPLACING FUEL PREFILTER CARTRIDGE (4-56)” or “METH-
OD FOR REPLACING FUEL MAIN FILTER CARTRIDGE (4-68)”.

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METHOD FOR CHECKING OIL LEVEL IN HYDRAULIC TANK, ADDING OIL

k WARNING
• Immediately after the engine is stopped, its parts and oil are still very hot and may cause burn in-
jury. Accordingly, wait until they have cooled down before starting the work.
• When removing the oil filler cap, the oil may spout out. Turn it slowly to release the internal pres-
sure, then remove it.

1. Set the machine in the posture shown in the figure.

If the machine is not set as shown in the figure, set it ac-
cording to the following procedure.
1) Start the engine, and run it at low speed.
2) Retract the arm and bucket cylinder rods to the end.
3) Lower the boom to lower the bucket tooth to the
ground.
4) Stop the engine.
2. Turn the staring switch key to ON position within 15 sec-
onds after stopping the engine, and move each control lev-
er (for work equipment and travel) to the full stroke in all directions.
The internal pressure is released by this operation.
3. Stop the engine.
4. Open the door on the left side of the machine and check
sight gauge (G).
When the oil level is between the lines H and L, it is appro-
priate.
If the oil level is below level L, the hydraulic oil is insuffi-
cient. Perform the following procedure.

5. Add oil through oil filler port (F) until the oil level comes between levels H and L of sight gauge (G).
NOTICE
Do not add oil above H line. It may damage the oil cir-
cuit and cause the oil to spurt out.
If oil has been refilled exceeding H level, swing the up-
per structure until drain plug (P) beneath the hydraulic
tank comes between the right and left tracks. Stop the
engine. After the hydraulic oil has been cooled down,
remove cover (1) and drain the excess oil through
drain plug (P) to the container for receiving the oil.

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REMARK
The oil level vary with the oil temperature. Accordingly, use
the followings as a guide:
• Before starting operation: Between H and L levels
(Oil temperature: 10 to 30 °C {50 to 86 °F} )
• Normal operation: Around H Level
(Oil temperature: 50 to 80 °C {122 to 176 °F} )

METHOD FOR INSTALLING HYDRAULIC TANK OIL FILLER CAP

k CAUTION
If the oil filler cap is inserted in reverse, it only rotates by approximately 1/4 turns and cannot be locked.

Install the oil filler cap according to the following procedure.

1. Align small protrusion (1) of oil filler cap and small cut out
part (2) of filler, and then insert the cap.

2. Rotate the cap by 1/2 turns, and lock it with the key.
Right figure shows the state that the oil filler cap is normal-
ly installed and locked.

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METHOD FOR CHECKING COOLANT LEVEL, ADDING COOLANT

k WARNING
• Do not open the radiator cap unless necessary. When checking the coolant level, check the sub-
tank when the engine is cold.
• Immediately after the engine is stopped, the coolant is still hot and the pressure is accumulated in
the radiator. If the cap is removed in this condition, it is dangerous that you may get burn injury.
Always wait for the temperature to go down, turn the cap slowly to release the pressure, then re-
move the cap with care.

1. Open the engine hood.

NOTICE
If the sub-tank is empty, leakage of coolant should be
suspected. After checking, repair any abnormality im-
mediately.
REMARK
If the inside of sub-tank is so dirty that you cannot check
the coolant level, see “METHOD FOR CLEANING INSIDE
OF COOLING SYSTEM (4-21)”.
2. Check sub-tank (1).
If the coolant level is within the range between FULL and
LOW, the coolant amount is at a proper level.
If the coolant level is below LOW, add coolant to FULL lev-
el through the filler port of sub-tank (1).
3. After refilling with coolant, tighten the cap securely.
4. Check the coolant level in the radiator. If the coolant level
is low, add Non-Amine Engine Coolant (AF-NAC) of the
same density as Non-Amine Engine Coolant (AF-NAC) in
the radiator, and then add it to the sub-tank.

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METHOD FOR CHECKING OIL LEVEL IN ENGINE OIL PAN, ADDING OIL
k WARNING
Immediately after the engine is stopped, its parts and oil are still very hot, and may cause burn injury.
Accordingly, wait until they have cooled down before starting the work.

REMARK
• When checking the oil level after the engine has been operated, wait for at least 15 minutes after stopping
the engine before checking.
If the machine is inclining, make it level before checking.
• When the ambient temperature is low, water or emulsified matter may stick to the dipstick, fuel filler cap,
etc. or the drained oil may be milky white because of water vapor in the blowby gas. However, if the coolant
level is normal, it is not a problem.
1. Open the engine hood.
2. Pull out dipstick (G) and wipe the oil off with a cloth.
3. Fully insert dipstick (G) into the dipstick pipe, then remove
it.

4. Check if the oil is sticking up to between marks H and L on

dipstick (G).
It is appropriate if the oil level is between marks H and L.
If the oil level is below the L mark, add oil through oil filler
port (F).

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5. If the oil level is higher than H, decrease it to a proper level

according to the following procedure.
1) Remove cover (1).
2) Drain excessive engine oil through drain valve (P) at
the bottom of the engine oil pan.
When draining the engine oil, put a container to re-
ceive the oil under the drain plug.
6. Check the oil level again.
7. If the oil is at the correct level, tighten the oil filler cap se-
curely and close the engine hood.

METHOD FOR CHECKING ELECTRIC WIRING

k CAUTION
• If fuses are frequently blown or if there are traces of short-circuiting on the electrical wiring,
promptly ask your Komatsu distributor to locate the cause of it and to perform the repair.
• Keep the top surface of the battery clean and check the vent hole in the battery cap. If it is clogged
with dirt or dust, wash the battery cap with water to clear the vent hole.

NOTICE
In particular, inspect the wiring of “battery”, “starting motor”, and “alternator” with care.
Perform the following inspection.
• Perform inspection to confirm that the fuses have no defect and their capacity is proper.
• Perform inspection to confirm that there is no disconnection or trace of short-circuiting in the electric wiring
and no damage to the coating.
• Perform inspection to confirm that there is no loose terminals, and tighten any loose parts if found.
• Always check if there is any accumulation of combustible material around the battery, and remove such
combustible material.

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METHOD FOR CHECKING FUEL LEVEL, ADDING FUEL

k WARNING
When adding fuel, never spill the fuel or let it overflow. It may cause fire.
If any fuel has spilled, wipe it up completely. If fuel has spilled over soil or sand, remove that soil or
sand.
Fuel is highly flammable and dangerous. Never bring any open flame near fuel.

1. Turn the starting switch to ON position. When the fuel level

caution lamp lights up in red, check the fuel level with fuel
level gauge (1) on the monitor panel.
When the fuel gauge pointer reads the red range, the fuel
quantity is 76 ℓ {20 U.S.Gal}  or less.
Since the fuel level is low, add fuel.
2. After checking, turn the starting switch back to OFF posi-
tion.

3. Open fuel filler cap (F) on the fuel tank and add fuel
through the filler port until float gauge (G) comes up to the
highest point.
Fuel tank capacity: 650 ℓ {172 U.S.Gal} 
Position of tip (a) of float gauge (G) when fuel tank is full:
Approximately 50 mm {2 in} 

REMARK
If breather hole (3) on the cap is clogged, the pressure in
the tank will drop and fuel will not flow. Clean the hole from
time to time.
4. After adding fuel, push float gauge (G) straight down with
fuel filler cap (F). Be careful not to get float gauge (G)
caught in the tab (2) of fuel filler cap (F), and tighten fuel
filler cap (F) securely.

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METHOD FOR CHECKING DEF LEVEL, ADDING DEF

k WARNING
• Do not put fluid other than DEF into DEF tank.
• When opening the cap of DEF tank of the machine, the ammonia vapor may escape. Keep your face
away from the filler port.
• Foreign materials in the DEF system or urea deposits caused by precipitation of urea may hinder
operation of the devices. Before removing the filler cap, wipe off the dirt from around the filler port.
Before inserting the filler nozzle into the filler port, wipe off dirt from it.
• If DEF is spilled, immediately wipe and wash the area with water. If spilled DEF is left unattended
and the area is not wiped and cleaned, it can cause corrosion to the contaminated area and emit
toxic gas.

NOTICE
• Do not add DEF more than line F of sight gauge (4). DEF may leak through the breather. When the
ambient temperature is low and DEF may freeze, do not add it more than line (9) of sight gauge (4).
Be careful of the DEF line to be added when performing operations on a slope or traveling on a
rough ground. When the remaining DEF level is low, it may become the warning level if DEF pump
sucks air or if DEF level suddenly drops.
• If DEF is stored in unspecified container, foreign material may mix in it and toxic gas or corrosive
substance may be produced by chemical reactions. When adding DEF, do not transfer it to another
container.
• Do not use a funnel when to add DEF. The strainer may be broken.
• When using a portable DEF refill container, use up DEF each time. If any of DEF is left, remove for-
eign material, if there is any.
• Do not wash the adding nozzle in city water. Minerals may clog the devices.
• Do not dilute DEF with water.
• If you add fluid other than DEF (diesel fuel, low concentration DEF, etc.) by mistake, the caution
lamp lights up and the audible alert sounds to warn the abnormality. In this case, ask your Komatsu
distributor for draining of the wrong fluid and for inspection. DEF injector and/or DEF pump may
need to be replaced.
1. Turn the starting switch to ON position (B).

2. Check the DEF level gauge (1) on the machine monitor.

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OPERATION MACHINE OPERATIONS AND CONTROLS

3. After checking, turn the starting switch back to OFF posi-

tion (A).

4. Open up cover (2) at the right side of the machine, clean

blue DEF tank filler cap (3) and surrounding area.
Turn the cap (3) counterclockwise.
The caps of DEF tanks are blue, as required by emission
regulations.

5. By sight gauge (4), add DEF through the filler port until
float (5) reaches line F (6).
Line (7) in the sight gauge indicates approximately 10 ℓ 
{2.6 U.S.Gal}  below line F, and line (8) indicates approxi-
mately 20 ℓ {5.3 U.S.Gal} .
Line (9) is the max adding line when DEF may freeze in
cold weather.

6. After adding, align claw (10) of the cap with groove (11) of
the filler port and close the cap securely by turning it clock-
wise by 90 °.

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MACHINE OPERATIONS AND CONTROLS OPERATION

REMARK
• It is recommended to use a nozzle having a diameter and a length specified by ISO 22241-4 and an auto
stop function to add DEF. When the specified nozzle is used, the magnet installed inside the filler port of the
tank cancels the wrong fluid addition prevention device, and you can add DEF. This mechanism prevents
addition of DEF into the fuel tank, addition of fuel into DEF tank, and spill of DEF from the filler port.
• When using a nozzle which is not conformed to ISO 22241-4, hold it in your hand and add DEF carefully
while checking the sight gauge.
• Add only DEF in clearly marked DEF tanks that have the blue cap.

METHOD FOR CHECKING WORKING LAMP

Check that the working lamps and lamps inside the instruments light up properly. Check also that there is no dirt
or damage.
1. Turn the starting switch to ON position.
2. Check that the working lamp lights up properly when the
lamp switch is at night mode (a) and at day mode (b).
3. After inspection, turn the lamp switch to OFF position (c),
and the working lamp goes out.
4. After checking, turn the starting switch back to OFF posi-
tion.

If the lamps do not light up, a broken bulb or disconnected wire are the possible causes. Ask your Komatsu
distributor for repairs.

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METHOD FOR CHECKING HORN

1. Turn the starting switch to ON position.
2. Check that the horn sounds immediately when the horn
switch is pressed.
3. After checking, return the starting switch to OFF position.

If the horn does not sound, ask your Komatsu distributor for repair.

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METHOD FOR ADJUSTING

METHOD FOR ADJUSTING OPERATOR'S SEAT
k WARNING
When adjusting the position of the operator's seat, always set the lock lever to LOCK position to pre-
vent any malfunction due to accidental contact with the control levers.

NOTICE
If the seat position is adjusted while the parts, tools, or empty cans are left around the operator's seat,
the peripheral parts or operator's seat may be damaged.
Check that there is no parts etc., around the operator's seat, and adjust the seat position.
• Always adjust the operator's seat before starting each operation or when the operators change shift.
• Adjust the operator's seat so that control levers and switches can be operated freely and easily with the
operator's back against the backrest.

METHOD FOR ADJUSTING SEAT IN FORE-AND-AFT DIRECTION

Pull up the fore-aft adjustment lever, set the seat to the desired
position, then release the lever.
Fore-and-aft adjustment: 160 mm {6.3 in}  (16 stages)

METHOD FOR RECLINING SEAT

The reclining of the seat becomes large when the seat is moved forward, and it becomes smaller as the seat is
moved backward. When moving the seat backward, return the reclined seat back to the original position.
Pull up the reclining adjustment lever and set the seat back to a
position which is comfortable for operation, then release the
lever.
REMARK
Sit with your back against the backrest when adjusting. If your
back is not touching the backrest, the backrest may suddenly
move forward.

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METHOD FOR TILTING SEAT

Pull up the tilt adjustment lever and adjust the front angle of the seat.
• To raise the front of the seat, apply your weight to the rear
of the seat, while pulling up lever.
• To lower the front of the seat, apply your weight to the front
of the seat, while pulling up lever.
Tilt adjustment: Up 5 ゜, down 5 ゜ (3 stages)

METHOD FOR ADJUSTING SEAT HEIGHT

Pull up the height adjustment lever (1) to move the seat back-
ward (A), then turn handle (2) to adjust the height.
Height adjustment: 75 mm {3 in} 

METHOD FOR ADJUSTING HEADREST IN VERTICAL DIRECTION

Move the headrest up or down to the desired height.
Amount of adjustment: 60 mm {2.4 in}  (2 stages)
NOTICE
When adjusting the headrest height, operate it so that the
shaft of the headrest becomes straight. If it is forcibly
twisted, the installation part may be broken.

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METHOD FOR ADJUSTING ARMREST HEIGHT

k CAUTION
Firmly tighten the knob. If it is found loosened, tighten it further.

Height of the armrest can be adjusted up or down by using the knob at the rear of the armrest.
Armrest height adjustment: 43 mm {1.7 in}  (4 steps)
1. Loosen knob (1) at the rear of the armrest.
2. Pull plunger (2).

3. Adjust the height of armrest (3) while pulling plunger (2).

4. Push back plunger (2) after aligning it to the height adjust-
ment hole of armrest (3).
5. Tighten knob (1) at the rear of the armrest.
NOTICE
If you loosen knob (1) at the rear of the armrest too
much, it touches the stopper in cover (4) and you can-
not adjust the armrest height. Take care.

METHOD FOR ADJUSTING ARMREST ANGLE

Angle of the armrest can be adjusted vertically by turning ad-
justment dial (7) at the bottom of the armrest (5).
Angle adjustment: 9 ° in lower direction, 4 ° in upper direction

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METHOD FOR ADJUSTING SEAT UNIT IN FORE-AND-AFT DIRECTION

Pull the fore-aft adjustment lever (8) to the right, set the seat to the desired position, then release the lever.
The operator's seat, right and left control levers, and lock lever move together.
Fore-and-aft adjustment: 180 mm {7.1 in}  (9 stages)

METHOD FOR ADJUSTING AIR SUSPENTION SEAT HARDNESS

Air suspension seat (if equipped)
Operate the suspension switch (9) to adjust the hardness of the suspension.
• If you press the suspension switch (9), the suspension be-
comes hard.
• If you pull the suspension switch (9), the suspension be-
comes soft. (Air release sound is heard.)
Weight adjustment range: 60 to 150 kg {132 to 331 lb} 

METHOD FOR HEATING SEAT

Heated seat (if equipped)
Turn the seat heater switch ON.
(a): OFF position
(b): ON position
The seat cushion and backrest become warm.

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METHOD FOR REMOVING AND INSTALLING HEADREST

METHOD FOR REMOVING HEADREST
When the headrest is not necessary, remove it according to the following procedure.
Pull up the headrest 80 mm {3.1 in}  or more.
The headrest is pulled out.
NOTICE
When removing the headrest, operate it so that the shaft of
the headrest becomes straight. If it is forcibly twisted, the
installation part may be broken.

METHOD FOR INSTALLING HEADREST

1. Insert the headrest into the hole at the seat back.
When installing, turn the notch of the shaft toward the front
of the machine.
2. Push down the headrest.
NOTICE
When installing the headrest, operate it so that the
shaft of the headrest becomes straight. If it is forcibly
twisted, the installation part may be broken.

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METHOD FOR ADJUSTING MIRRORS

k WARNING
Be sure to adjust the mirrors before starting work. If they are not adjusted properly, you cannot secure
the visibility and may be injured or may lead to a serious personal injury or death.

k CAUTION
To prevent the machine from moving during the work, make sure that the following conditions are met
before starting the work.
• The machine is placed on a firm, level ground.
• The work equipment is lowered to the ground in secure posture.
• The lock lever is in LOCK position.
• The engine is stopped.

Mirror (A): Machine L.H. front mirror

Mirror (B): Machine R.H. front mirror
Mirror (C): Machine R.H. side mirror

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PROCEDURE FOR ADJUSTING MACHINE LEFT FRONT MIRROR (A)

k CAUTION
To prevent the machine from moving during the work, make sure that the following conditions are met
before starting the work.
• The machine is placed on a firm, level ground.
• The work equipment is lowered to the ground in secure posture.
• The lock lever is in LOCK position.
• The engine is stopped.

Adjust the mirror so that the operator can see a person at the rear left of the machine.
1. Adjust the mirror with your hand so that the side of the ma-
chine is reflected in the mirror as shown in the figure.
2. Check that you can see a person at the rear left end of the
machine.

3. If you cannot adjust, loosen mounting bolts (1) of the mir-

ror and stay, and adjust the angles.

If the mirror is adjusted by loosening the mounting bolts, be sure to adjust the mirror to its specified position. For
the adjustment method, see the “procedure for adjusting specified position of mirror at front left of the machine”.

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PROCEDURE FOR ADJUSTING REGULAR POSITION OF MACHINE LEFT

FRONT MIRROR (A)
k CAUTION
To prevent the machine from moving during the work, make sure that the following conditions are met
before starting the work.
• The machine is placed on a firm, level ground.
• The work equipment is lowered to the ground in secure posture.
• The lock lever is in LOCK position.
• The engine is stopped.

When returning the mirror to its regular position, perform the

following adjustment.
1. Adjust stay (1).
Mounting position (2): 59 mm {2.3 in} 
Mounting angle (3): 81 °
Mounting angle (4): 110 °

2. Adjust mirror (5).

Tightening torque of mounting bolt (6): 6.0 to 7.0 Nm {0.61
to 0.71 kgm,4.41 to 5.14 lbft}
Mounting position (7): 151 mm {5.9 in} 

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NOTICE
• Tighten the right and left bolts of each bracket al-
ternately so that their right and left clearances (R)
and (L) become equal.
• If the mirror and stay mounting bolts are tightened
excessively, the bracket may be damaged. Be sure
to tighten bolts to the specified torque.

Adjust the mirror so that the side of the machine is reflect-

ed in it as shown in the figure.

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PROCEDURE FOR ADJUSTING MACHINE RIGHT FRONT MIRROR (B)

k CAUTION
To prevent the machine from moving during the work, make sure that the following conditions are met
before starting the work.
• The machine is placed on a firm, level ground.
• The work equipment is lowered to the ground in secure posture.
• The lock lever is in LOCK position.
• The engine is stopped.

Adjust the mirror so that you can see a person at the rear right
of the machine.

1. Adjust the mirror with your hand so that the side of the ma-
chine is reflected in the mirror as shown in the figure.
2. Check that you can see a person at the rear right of the
machine.

3. If you cannot adjust, loosen mounting bolts (1) of the mir-

ror and stay, and adjust the angles.

If the mirror is adjusted by loosening the mounting bolts, be sure to adjust the mirror to its regular position. For
the adjustment method, see the “Procedure for adjusting regular position of machine right front mirror”.

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MACHINE OPERATIONS AND CONTROLS OPERATION

PROCEDURE FOR ADJUSTING REGULAR POSITION OF MACHINE RIGHT

FRONT MIRROR (B)
k CAUTION
To prevent the machine from moving during the work, make sure that the following conditions are met
before starting the work.
• The machine is placed on a firm, level ground.
• The work equipment is lowered to the ground in secure posture.
• The lock lever is in LOCK position.
• The engine is stopped.

When returning the mirror to its regular position, perform the following adjustment.
Adjust mirror (1).
Tightening torque of mounting bolt (2): 6.0 to 7.0 Nm {0.61 to
0.71 kgm,4.41 to 5.14 lbft}
Mounting position (3): 120 mm {4.7 in} 
Mounting angle (4): 30 °

NOTICE
• Tighten the right and left bolts of each bracket alter-
nately so that their right and left clearances (R) and (L)
become equal.
• If the mirror and stay mounting bolts are tightened ex-
cessively, the bracket may be damaged. Be sure to
tighten bolts to the specified torque.

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Adjust the mirror so that the side of the machine is reflected in

it as shown in the figure.

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PROCEDURE FOR ADJUSTING MACHINE RIGHT SIDE MIRROR (C)

k CAUTION
To prevent the machine from moving during the work, make sure that the following conditions are met
before starting the work.
• The machine is placed on a firm, level ground.
• The work equipment is lowered to the ground in secure posture.
• The lock lever is in LOCK position.
• The engine is stopped.

• Adjust it so that people within 1 m around the machine can

be seen from the operator's seat.
(W): 1 m {3 ft 3 in}

• The regular position of the mirror is as follows:

Adjust mirror (1).
Tightening torque of mounting bolt (2): 6.0 to 7.0 Nm {0.61
to 0.71 kgm, 4.41 to 5.14 lbft}
Mounting angle (3): 15 °
Mounting position (4): 15 mm {0.6 in} 

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METHOD FOR ADJUSTING REAR VIEW CAMERA ANGLE

k WARNING
• Always adjust the camera before starting work. If it is
not adjusted properly, you cannot secure the visibility
and a serious personal injury or death may result. .
• When adjusting the angle of the camera, prepare a
scaffold first in order to provide a safe working plat-
form.
If you try to work standing on the counterweight, there
is a danger of serious injury or death due to falling off
from the machine.

Adjust the angle of the rearview camera so that people within

1 m (3ft 3in) away from the machine's rear part (W) can be
seen in the machine monitor at the operator's seat.

If the image on the monitor is not aligned correctly, adjust

mounting angle (A) of the rearview camera in the following pro-
cedure.
Angle (A) can be adjusted within the range from 32 to 53 °.

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MACHINE OPERATIONS AND CONTROLS OPERATION

1. Insert a flat-head screwdriver or the like into hole (3) of

cover (2) and push inside tooth (B) to remove the cover.
2. Remove bolts (4) (2 places).

3. Remove cover (1).

REMARK
• Shim (6) may be inserted in the cover mounting bolts
to adjust the clearance in the rim of the cover. When
removing cover (1), record the places and quantities
of the shims. When installing the cover, insert the
shims according to the record.
• Take care of shim (6), since it comes off together with
cover (1).

4. Loosen camera mounting bolts (5) (3 places) and adjust

camera mounting angle (A) so that corner (D) of mounting
bracket (C) is aligned with horizontal line (E).

5. After adjusting, tighten bolts (5).

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OPERATION MACHINE OPERATIONS AND CONTROLS

Tightening torque: 11.8 to 14.7 Nm {1.2 to 1.5 kgm, 8.7 to 10.8 lbft}
REMARK
A part of the machine is shown on the monitor screen.

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METHOD FOR FASTENING AND UNFASTENING SEAT BELT

k WARNING
• Before fastening the seat belt, check that there is no problem in the belt mounting bracket or belt. If
it is worn or damaged, replace it.
• Even if no problem can be seen in the belt, replace the seat belt every 3 years from starting usage
or 5 years after manufacture whichever comes sooner.
• Be sure to use the seat belt during operation.
• Do not twist the seat belt when fastening.

REMARK
• The date of manufacture of the belt is shown on the back of the belt.
• The date indicated on the seat belt is the manufactured date. It is the start of the 5-year period. It is not the
start of the 3-year period of actual usage.
• This seat belt has a retractable device, so it is not necessary to adjust the length.

METHOD FOR FASTENING SEAT BELT

1. Hold grip (2) and pull out the belt from retractable device
(1).
2. Check that the belt is not twisted, and then inset tongue (3)
into buckle (4) securely.
3. Pull the belt lightly to check that it is properly locked.

METHOD FOR UNFASTENING SEAT BELT

Press button (5) in buckle (4) and remove tongue (3) from buckle (4).
The belt is automatically wound in, hold grip (2) and return the belt slowly to retractable device (1).
REMARK
If the tongue is not inserted in the buckle of the seat belt, the
seat belt caution lamp is displayed at the left top of the ma-
chine monitor. Fasten the seat belt.

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METHOD FOR OPERATIONS AND CHECKS BEFORE STARTING ENGINE

k WARNING
When starting the engine, check that the lock lever is se-
curely at LOCK position.

Perform the check before starting the engine according to the

following procedure.

1. Check that battery disconnect switch (S) is in ON position

(I).

2. Check that lock lever (1) is at LOCK position (L).

3. Check that all control levers and control pedals are at
NEUTRAL position.
If the control levers and control pedals are not being
touched, they will be at NEUTRAL position.

4. Insert the key into starting switch (2) and turn it to ON posi-
tion (B).

5. On the input display screen displayed on the monitor, input

the password and push input confirmation switch F6.
If a password is set, the input display screen will be indi-
cated on the monitor screen.
REMARK
Contact your Komatsu distributor for details of the method
of setting, changing, or canceling the password.

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6. Perform the following inspection on the machine monitor.

1) The buzzer sounds for approximately 2 seconds and
the following caution lamps and meters light up for ap-
proximately 2 seconds.
• Radiator coolant level caution lamp (3)
• Charge level caution lamp (4)
• Engine oil pressure caution lamp (5)
• Engine oil level caution lamp (6)
• Air cleaner clogging caution lamp (7)
If any caution lamp does not light up or the buzzer does not sound, there is probably a failure in the
caution lamp, so ask your Komatsu distributor for repair.
2) After approximately 2 seconds, the screen will change to the working mode/travel speed display. Then,
it will switch to the standard screen.
• Engine coolant temperature gauge (8)
• Engine coolant temperature caution lamp (9)
• Fuel gauge (10)
• Fuel level caution lamp (11)
• Hydraulic oil temperature gauge (12)
• Hydraulic oil temperature caution lamp (13)
• DEF level caution lamp (14)
• DEF level gauge (15)

3) If the caution lamp (16) stays lit in red, immediately

check the item lit in red.
For details of contents and check methods for caution
lamp, see “WARNING DISPLAY (3-19)”.

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7. If the maintenance time has passed for certain items,

maintenance time caution lamp (17) is lit in red for 30 sec-
onds. Press switch F6, check the item, and perform main-
tenance immediately.
For details of the method of checking the maintenance in-
terval, see “MAINTENANCE SCREEN SETTING (3-83)” in
EXPLANATION OF COMPONENTS.

METHOD FOR STARTING ENGINE

k WARNING
• Start the engine only while sitting down in the operator's seat.
• Do not attempt to start the engine by short-circuiting the engine starting circuit.
Doing so may cause a serious personal injury or death or fire.
• Check that there are no persons or obstacles in the surrounding area, then sound the horn and start
the engine.
• Never use starting aid fluids as they may cause explosions.
• Exhaust gas is toxic.
When starting the engine in confined spaces, be particularly careful to ensure good ventilation.

NOTICE
• Before starting the engine, check that fuel control dial
(2) is at Low idle (MIN) position. If the fuel control dial
is at High idle (MAX) position, the engine will acceler-
ate suddenly and cause damage to the engine parts.
• Do not keep the key in starting switch (3) at the START
position continuously for more than 20 seconds.
If the engine does not start, wait for at least 2 minutes,
then start again from the beginning.
• After the engine starts, wait for the engine oil pressure
caution lamp to go out. Do not touch the control levers
or control pedal while the engine oil pressure caution
lamp is lit.
This machine is equipped with an engine automatic preheating device that functions to start the engine preheat-
ing automatically.
When the ambient temperature is low, the preheating caution lamp lights up when the key in starting switch (3)
is turned to ON position to inform the operator that preheating has been started automatically.
Start the engine according to the following procedure.
1. Check that lock lever (1) is at LOCK position (L).
If lock lever (1) is in FREE position (F), the engine does
not start.

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MACHINE OPERATIONS AND CONTROLS OPERATION

2. Turn fuel control dial (2) to Low idle (MIN) position.

3. Turn the key in starting switch (3) to ON position (B).

REMARK
If the ambient temperature is low, the preheating pilot lamp
lights up and automatic preheating is performed. Keep the
key in starting switch (3) at ON position (B) until the pre-
heating pilot lamp goes out.
The time that the preheating pilot lamp stays lit depends
on the ambient temperature as shown in the table.
Ambient temperature Lighting time
5 seconds to 40 sec-
-4°C to -20°C
onds
Max. -20°C 40 seconds

If a password has been set, the input display screen will be

indicated on the monitor screen, but the preheating pilot
lamp also operates as in the standard screen.
4. If the preheating pilot lamp does not light up, or it lights up and then goes out to inform that the engine pre-
heating has been completed, turn the key in starting switch (3) to START position (C). The engine will start.
REMARK
If the ambient temperature is low, the engine may not start
even when the key in starting switch (3) is kept at START
position for 20 seconds.
If this happens, wait for at least 2 minutes, then start again
from the beginning.
To preheat the engine forcibly when the automatic preheat-
ing does not start, see “METHOD FOR MANUAL PRE-
HEATING WHEN STARTING ENGINE (3-186)”.

5. When the engine starts, release the starting switch key (3). The key will automatically return to ON position
(B).
REMARK
When the engine is started, the battery voltage may sud-
denly drop depending on the temperature and the battery
condition. If this happens, the display on the machine mon-
itor may momentarily go out, but this does not indicate any
abnormality.

6. After the engine starts, wait for the engine oil pressure caution lamp to go out. Do not touch the control
levers or control pedal while the engine oil pressure caution lamp is lit.

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OPERATION MACHINE OPERATIONS AND CONTROLS

NOTICE
If the engine oil pressure caution lamp does not go out
in 4 to 5 seconds, stop the engine immediately. Check
the oil level, oil leakage, etc. and take proper meas-
ures.
REMARK
White smoke may be discharged for a short time immedi-
ately after the engine is started or during the aftertreatment
devices regeneration in the cold season, but this is not a
failure.
REMARK
Urea SCR system has the function of heating and keeping itself warm to prevent freezing of DEF.
If DEF is frozen, DEF system is heated and thawed automatically after the engine starts. The devices do
not operate until DEF is thawed and supplied, but this does not indicate any abnormality.
When the ambient temperature decreases so much that DEF may freeze while the machine is in operation,
DEF system is warmed automatically to prevent freezing. When the ambient temperature decreases so
much that freezing of DEF is not preventable, the devices stop automatically, but this does not indicate any
abnormality.
If DEF freezes, thawing operation is performed automatically. Never heat DEF. Harmful ammonia gas may
be generated.

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MACHINE OPERATIONS AND CONTROLS OPERATION

METHOD FOR MANUAL PREHEATING WHEN STARTING ENGINE

Regardless of the ambient temperature, it is possible to start the engine preheating manually.
1. Turn the key in starting switch (3) counterclockwise from OFF position (A). The preheating pilot lamp lights
up and preheating of the engine starts. (Preheating continues while the key in starting switch (3) is held
counterclockwise.)
The preheating pilot lamp starts flashing approximately 30
seconds after preheating starts and then goes out in ap-
proximately 10 seconds.

2. After the preheating pilot lamp goes out, turn the key of
starting switch (3) to START position (C). The engine
starts.

If the engine cannot be started with the above procedure, wait for approximately 2 minutes, then start again
from step 1.

TURBOCHARGER PROTECTION FUNCTION

The turbo protect function protects the turbocharger by keeping the engine speed at approximately 1000 rpm or
less immediately after the engine is started.
• When the turbo protect function is actuated, the engine speed is held at approximately 1000 rpm or less,
regardless of the position of the fuel control dial.
• When the turbo protect function is actuated, the engine speed is held at approximately 1000 rpm or less,
even if the fuel control dial is operated.
• When the turbo protect function is canceled, the engine speed is set to the speed for the position of the fuel
control dial.
• The actuation time of the turbo protect function is limited to 20 seconds.

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METHOD FOR OPERATIONS AND CHECKS AFTER STARTING ENGINE

k WARNING
• If there has been any emergency stop, abnormal ac-
tuation or trouble, turn the starting switch key to OFF
position.
• Do not perform operations nor operate the levers or
pedal abruptly while the hydraulic oil is at low temper-
ature. Always perform the warm-up operation for the
hydraulic equipment until the hydraulic oil tempera-
ture caution lamp displays the correct temperature.
(When the hydraulic oil temperature is low, the low
temperature display shown in the figure is given.
• Display (A) when temperature is correct: Caution
lamp background (C) is blue.
• Display (B) when temperature is low: Caution lamp
background (C) is white.)
• If the warm-up operation for the hydraulic equipment
is not performed thoroughly, and the machine is
moved, the reaction of the machine to the operation of
the control levers and pedals will be slow and the
movement of the machine may not be what the opera-
tor intended. Particularly in a cold weather, be sure the
warm-up operation is completed.
• Keep away from the exhaust pipe while the engine is
running and immediately after stopping the engine.
Keep combustible materials away from the exhaust
pipe outlet.

There are 2 types of warm-up operation: warm-up of the engine and warm-up of the hydraulic equipment. In
addition, depending on the environment, the method of performing the warm-up operation may differ, so perform
the warm-up operation according to the descriptions given in the appropriate section.
The hydraulic equipment is not warmed by simply performing engine warm-up operation. Perform the warm-up
operations for the hydraulic equipment and engine separately. Warm-up of the hydraulic equipment thoroughly
ensures that the hydraulic oil is warmed up and that warm hydraulic oil circulates in all the control circuits.

METHOD FOR CHECKING STARTING CONDITION AND UNUSUAL NOISE OF

ENGINE
• When starting the engine, check that the engine causes no abnormal noise and that it starts up easily and
smoothly.
• Check that there is no abnormal noise when the engine is idling or when the engine speed rises slightly.
When there is an abnormal noise at the engine startup and if that condition continues, the engine may be dam-
aged. In that case, ask your Komatsu distributor to check the engine as soon as possible.

METHOD FOR CHECKING LOW-SPEED RUN AND ACCELERATION OF ENGINE

k CAUTION
• Perform these checks in a safe place, watching out for danger in the surroundings.
• When the engine performs very badly at low idle and in the acceleration and if that condition contin-
ues, it may damage the engine or confuse the operator's sense of driving or lower the braking effi-
ciency, and as a result lead to an unexpected accident. In that case, ask your Komatsu distributor to
check the engine as soon as possible.

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MACHINE OPERATIONS AND CONTROLS OPERATION

• When stopping the machine during the normal traveling operation, check that the engine does not hunt or
stop suddenly.
• Check that the engine speed rises smoothly when the fuel control dial is turned to High idle (MAX) position.
REMARK
• The smell of the exhaust gas is different from that of the conventional diesel engine because of the exhaust
gas filtering function.
• White smoke may be discharged for a short time immediately after the engine is started or during the after-
treatment devices regeneration in the cold season, but this is not a failure.
• When the hydraulic oil temperature is low, the engine speed and engine output at high idle are set to low to
protect the components. When the hydraulic oil temperature becomes proper level, the engine speed and
engine output at high idle are raised and the machine operates normally.

METHOD FOR RUNNING-IN THE NEW MACHINE

NOTICE
Your Komatsu machine has been thoroughly adjusted and tested before shipment from the factory.
However, operating the machine under full load before breaking the machine in can adversely affect the
performance and shorten the machine life.
Be sure to break in the machine for the initial 100 hours (as indicated on the service meter).
Make sure that you fully understand the descriptions in this manual, then run in the machine while paying atten-
tion to the following points.
• Run the engine at idle for 15 seconds immediately after starting it up.
Do not operate the control levers or fuel control dial during this time.
• Perform warm-up operation for 5 minutes after starting it up.
• Avoid operation with heavy loads or at high speeds.
• Immediately after starting the engine, avoid sudden starts, sudden acceleration, unnecessary sudden
stops, and sudden changes in direction of the machine.

METHOD FOR ENGINE WARM-UP OPERATION

NOTICE
• Do not accelerate the engine abruptly until it is warmed up.
• Do not run the engine at low idle or high idle under no load for more than 20 minutes. This will have
an adverse effect on the environment and also on the internal structure of the engine. If it is neces-
sary to run the engine at idle for 20 minutes or more, apply a load from time to time or run at a medi-
um speed.
This machine is equipped with an automatic engine warm-up system, so if the engine coolant temperature is
30 °C {86 °F}  or less after the engine is started, the engine warm-up operation starts automatically. When the
engine automatic warm-up operation starts, the engine speed is maintained higher than the normal speed at low
idle.
If the engine coolant temperature goes 30 °C {86 °F}  or more or if the warm-up operation is continued for more
than 10 minutes, the automatic warm-up operation is canceled and the engine speed drops to the normal speed
at low idle.
Do not start operating the machine immediately. First, perform the following operations and checks.

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OPERATION MACHINE OPERATIONS AND CONTROLS

1. Check that engine coolant temperature caution lamp (1)

displays the proper temperature.
If it displays low temperature, perform additional warm-up
of the engine according to step 2 until it displays the prop-
er temperature.
• Display (A) when temperature is proper: Caution lamp
background (C) is blue.
• Display (B) when temperature is low: Caution lamp
background (C) is white.

2. Turn fuel control dial (2) to the middle between Low idle
(MIN) and High idle (MAX) to run the engine at a medium
speed.

Run the engine with no load until engine coolant temperature

caution lamp (1) displays proper temperature.
• Display (A) when temperature is proper: Caution lamp
background (C) is blue.
• Display (B) when temperature is low: Caution lamp back-
ground (C) is white.

If the engine coolant temperature caution lamp displays the proper temperature, the engine warm-up operation
is completed.
Then, perform the warm-up operation for the hydraulic components.

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MACHINE OPERATIONS AND CONTROLS OPERATION

METHOD FOR CANCELING AUTOMATIC WARM-UP OPERATION

When you are forced to urgently cancel the automatic warm-up
operation or to lower the engine speed to Low idle (MIN), do as
follows.

1. Turn fuel control dial (2) to High idle (MAX) position and
hold it for 3 seconds or more.

2. Turn fuel control dial (2) to Low idle (MIN) position.

The engine automatic warm-up is canceled, and the en-
gine speed is lowered.

REMARK
Turbo protect function takes priority over the engine automatic warm-up.
When the turbo protect function activates, run the engine at low idle even the engine coolant temperature is
30°C or less. Then the engine automatic warm-up starts automatically to increase the engine speed.
For details of the turbocharger protect function, see “METHOD FOR STARTING ENGINE (3-183)”.

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METHOD FOR HYDRAULIC SYSTEM WARM-UP OPERATION

k WARNING
• Before performing the warm-up operation for the hy-
draulic equipment, set the swing lock switch on, check
on the monitor that the swing lock is actuated, then
start the warm-up operation.
• When warming up the hydraulic equipment, check that
there is no person or obstacle in the surrounding area,
then sound the horn and start the operation.
• Perform the warm-up operation for the hydraulic
equipment until the hydraulic oil temperature caution
lamp displays the proper temperature. (When the hy-
draulic oil temperature is low, the low temperature dis-
play shown in the figure is given.)
• Display (A) when temperature is proper: Caution
lamp background (C) is blue.
• Display (B) when temperature is low: Caution lamp
background (C) is white.)
• The warm-up operation for the hydraulic equipment is
necessary not only for the circuit between the pump
and cylinders and between the pump and motor, but
also for the control circuits. Do not perform the opera-
tion just for one cylinder or motor, or the operation
just in one direction. Perform the operation in all direc-
tions for all the work equipment (boom, arm and buck-
et), swing, travel, and attachment (if equipped).
• Before operating the travel lever, check the direction
of the track frame.

1. Check that engine coolant temperature caution lamp (1)

displays the proper temperature.
• Display (A) when temperature is proper: Caution lamp
background (C) is blue.
• Display (B) when temperature is low: Caution lamp
background (C) is white.
If it displays low temperature, perform additional warm up
of the engine until engine coolant temperature caution
lamp (1) displays the proper temperature. For detail, see
“METHOD FOR ENGINE WARM-UP OPERATION
(3-188)”.
2. Set swing lock switch (2) to ON position and check that the
swing lock pilot lamp is lit.

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MACHINE OPERATIONS AND CONTROLS OPERATION

3. Set the working mode to P mode (heavy-duty operation

mode).
The hydraulic component is warmed up quickly.
For the details of the working mode setting procedure, see
“WORKING MODE SELECTOR SWITCH (3-48)”.

4. Move lock lever (3) slowly to FREE position (F), then raise
the bucket from the ground.

5. Turn fuel control dial (4) to a position midway between Low

idle (MIN) and High idle (MAX).

6. Operate the work equipment to warm up the hydraulic

components.
NOTICE
When the work equipment is operated, take care that it
does not interfere with the machine or ground.
1) Move R.H. work equipment control lever (5) slowly in
the direction of bucket CURL position (D). Operate the
lever to the end of its stroke and hold it in the position
for 30 seconds.
2) Move R.H. work equipment control lever (5) slowly in
the direction bucket DUMP position (C). Operate the lever to the end of its stroke and hold it in the
position for 30 seconds.
3) Next, move L.H. work equipment control lever (6) slowly in the direction arm IN position (B). Operate
the lever to the end of its stroke and hold it in the position for 30 seconds.
4) Move L.H. work equipment control lever (6) slowly in the direction arm OUT position (A). Operate the
lever to the end of its stroke and hold it in the position for 30 seconds.
7. Repeat the operation of step 6 for 5 minutes.
8. Check that hydraulic oil temperature caution lamp (7) displays proper temperature.
If the hydraulic oil temperature caution lamp is not displaying the proper temperature (it is displaying low
temperature), repeat steps 6 to 7 until it displays the proper temperature.

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OPERATION MACHINE OPERATIONS AND CONTROLS

• Display (A) when temperature is proper: Caution lamp

background (C) is blue.
• Display (B) when temperature is low: Caution lamp
background (C) is white.

9. Check that engine coolant temperature caution lamp (1)

displays the proper temperature.
• Display (A) when temperature is proper: Caution lamp
background (C) is blue.
• Display (B) when temperature is low: Caution lamp
background (C) is white.
If it displays low temperature, perform additional warm up
of the engine until engine coolant temperature caution
lamp (1) displays the proper temperature.
For detail, see “METHOD FOR ENGINE WARM-UP OP-
ERATION (3-188)”.
10. Check that the hydraulic oil temperature caution lamp and engine coolant temperature caution lamp display
the proper temperature, then check that all the instruments, caution lamps, and pilot lamps on the machine
monitor are in the following conditions.
• Radiator coolant level caution lamp (8): OFF
• Charge level caution lamp (9): OFF
• Engine oil pressure caution lamp (10): OFF
• Engine oil level caution lamp (11): OFF
• Air cleaner clogging caution lamp (12): OFF
• DEF system caution lamp (13): OFF
• Engine preheating pilot lamp (14): OFF
• Engine coolant temperature gauge (15): Indicator in
green range
• Engine coolant temperature caution lamp (1): Displays
proper temperature
• Hydraulic oil temperature gauge (16): Indicator in
green range
• Hydraulic oil temperature caution lamp (7): Displays
proper temperature
• Fuel gauge (17): Indicator in green range
• Fuel level caution lamp (18): Displays appropriate lev-
el
11. Check for abnormal exhaust gas color, noise, or vibration.
If any problem is found, contact your Komatsu distributor.
NOTICE
In cold temperatures (ambient temperature below 0°C (32°F)), even when the hydraulic oil temperature
caution lamp displays the proper temperature, perform the "Hydraulic system warm-up operation in
cold weather" to warm up all the hydraulic equipment.
12. Hydraulic system warm-up operation in cold weather

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MACHINE OPERATIONS AND CONTROLS OPERATION

1) Turn fuel control dial (4) to High idle (MAX) position.

2) Repeat the work equipment operation of step 6 for 3

to 5 minutes.
• Display (A) when temperature is proper: Caution
lamp background (C) is blue.
• Display (B) when temperature is low: Caution
lamp background (C) is white.
3) Check that the hydraulic oil temperature caution lamp
displays proper temperature.
If it is not displaying the proper temperature, repeat
step 2) until hydraulic oil temperature caution lamp (7)
displays the proper temperature.
13. Before starting the work, check that fuel control dial (4) is
at a position midway between Low idle (MIN) and High idle
(MAX).
If it is not at the midway position, set it to the midway posi-
tion and run the engine at a mid-range speed before oper-
ating.

14. Before starting actual work, repeat the following operation

3 to 5 times.
Circulate warm hydraulic oil through all control circuits.

• Boom operation: RAISE (E) ←→ LOWER (F)

• Arm operation: IN (B) ←→ OUT (A)
• Bucket operation: CURL (D) ←→ DUMP (C)
• Swing operation: LEFT (G) ←→ RIGHT (H)

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When performing swing operations, release swing

lock switch (2), check that swing lock pilot lamp (18) is
not lit, then operate the swing.

• Travel (Lo) operation: FORWARD (A) ←→ REVERSE

(B)

• For attachment operations (if equipped), change the

working mode to the attachment mode.

Attachment operation: One way (A) ←→ Other way

(B)

15. Check that hydraulic oil temperature caution lamp (7) dis-
plays proper temperature.
If the hydraulic oil temperature caution lamp is not display-
ing the proper temperature (it is displaying low tempera-
ture), repeat steps 6 to 7 until it displays the proper tem-
perature.
• Display (A) when temperature is proper: Caution lamp
background (C) is blue.
• Display (B) when temperature is low: Caution lamp
background (C) is white.
If the hydraulic oil temperature caution lamp displays the proper temperature, the hydraulic equipment warm-up
operation is completed.

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MACHINE OPERATIONS AND CONTROLS OPERATION

After checking that the hydraulic oil temperature caution lamp displays the proper temperature, perform the op-
eration after completion of the warm-up operation.

METHOD FOR OPERATION AFTER COMPLETION OF WARM-UP OPERATION

1. Check that hydraulic oil temperature caution lamp (7) dis-
plays proper temperature.
• Display (A) when temperature is proper: Caution lamp
background (C) is blue.
• Display (B) when temperature is low: Caution lamp
background (C) is white.

2. Press working mode selector switch (20) of the machine

monitor to select the working mode to be used.
For change of the working mode, see “WORKING MODE
SELECTOR SWITCH (3-48)”.

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Display of working mode

P mode E mode
For heavy-duty operations For fuel economy conscious operations

L mode B mode
For operations requiring fine control For breaker operations

ATT/P mode ATT/E mode

For operations of 2-way attachments like crusher For operations of 2-way attachments like crusher
(fuel economy conscious operations)

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METHOD FOR STOPPING ENGINE

k WARNING
Keep away from the exhaust pipe immediately after stopping the engine.

NOTICE
If the engine is stopped abruptly, the service lives of com-
ponent parts of the engine may be considerably reduced.
Do not stop the engine abruptly except in an emergency.
Do not stop the engine abruptly except the case in an
emergency. If the engine is overheated, do not try to stop it
abruptly but run it at medium speed to allow it to cool
down gradually, and then stop it.
If the engine is stopped during the aftertreatment devices
regeneration, the components may be damaged.
When stopping the engine, stop the aftertreatment devices
regeneration first according to “PROCEDURE FOR AFTER-
TREATMENT DEVICES REGENERATION DISABLE SET-
TING (3-129)”, then stop the engine after running it at low
idle for approximately 5 minutes. Then stop the engine.
Stop the engine according to the following procedure.
1. Set the lock lever to LOCK position (L).
2. Run the engine at low idle for approximately 5 minutes to
cool down gradually.

3. Turn the starting switch to OFF position (A), and stop the
engine.

4. Remove the key from starting switch (1).

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REMARK
• When engine starting switch (1) is turned to OFF (A)
position, the engine stops, but the machine's main
power supply is not turned off immediately.
This is a time lag provided for the controller to memo-
rize the operation status and then terminate the sys-
tem. While this process continues, the main power is
maintained. The power holding time varies depending
on the operation condition.
• Also when the cooling fan is used for a cleaning pur-
pose, the machine's main power supply is not turned
off immediately, even if engine starting switch (1) is
turned to OFF (A) position.
This time lag is provided to protect the hydraulic cir-
cuit, and in this case, the machine's main power is
maintained for 7 seconds.
• If the starting switch key is turned to OFF (A) position
while the engine is still hot, guidance (2) may be dis-
played on the machine monitor. To cool down the en-
gine before stopping, run it at low idle for approximate-
ly 5 minutes, because it may cause damage to the de-
vices.
• After the engine is stopped, DEF in DEF injector and
pump is automatically purged and returned to the tank
to prevent malfunction of the devices caused by freez-
ing of DEF or deposition of urea.
For this reason, the device operates for a few minutes
even after the starting switch key is turned off, but this
is not an abnormality.
Do not turn OFF the battery disconnect switch while
the devices are operating to purge. After the purge is
completed, the devices stop automatically.

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METHOD FOR STARTING MACHINE (TRAVEL FORWARD AND REVERSE)

AND STOPPING MACHINE
k WARNING
• Before operating the travel levers or travel pedals,
check the direction of the track frame.
If the track frame is facing the rear (if the sprocket is at
the front), the machine moves in the opposite direction
to the direction of the operation of the travel levers or
travel pedals (front and rear travel are reversed, right
and left steering are reversed).
• Check that the area around the machine is safe, sound
the horn before starting the machine.
• Prohibit anyone other than the operator from coming
close to the machine during operation.
• Clear any obstacles from the travel path.
• There is a blind spot at the rear of the machine, so be
particularly careful when traveling in reverse.
• If the travel levers or travel pedals are operated when
the engine speed is decreased by the auto-decelera-
tion function, the engine speed will suddenly increase.
Operate the levers carefully.
• When traveling, check that the alarm sounds normally.

PREPARATIONS FOR MOVING MACHINE

Prepare for moving the machine according to the following procedure.
1. Set swing lock switch (1) to ON (actuated) position and
check that the swing lock pilot lamp (2) is lit.
](a): ON position
(b): OFF position

2. Turn fuel control dial (3) to High idle (MAX) position.

Increase the engine speed.

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METHOD FOR TRAVELING FORWARD

1. Set lock lever (4) to FREE position (F).
Set the work equipment in the travel posture and raise it to
40 to 50 cm {1 ft 4 in to 1 ft 8 in} above the ground.
• If the work equipment blocks the view and it is difficult
to travel safely, raise the work equipment further.
2. Operate right and left travel levers (5) or right and left trav-
el pedals (6) as follows:
3. Check the position of the sprocket.

• When sprocket (A) is at the rear of the machine:

Start the machine either by pushing levers (5) forward
slowly or by depressing the front parts of pedals (6)
slowly.

• When sprocket (A) is at the front of the machine:

Start the machine either by pulling levers (5) backward
slowly or by depressing the rear parts of pedals (6)
slowly.

4. When traveling, check that the alarm sounds normally.

If the travel alarm does not sound, ask your Komatsu distributor for repair.
REMARK
In low temperatures, if the machine travel speed is not normal, thoroughly perform the warm-up operation.
In addition, if the undercarriage is packed with mud and the machine travel speed is not normal, remove the soil
and mud from the undercarriage.

METHOD FOR TRAVELING REVERSE

1. Set lock lever (4) to FREE position (F).
Set the work equipment in the travel posture and raise it to
40 to 50 cm {1 ft 4 in to 1 ft 8 in} above the ground.
• If the work equipment blocks the view and it is difficult
to travel safely, raise the work equipment further.
2. Operate right and left travel levers (5) or right and left trav-
el pedals (6) as follows:
3. Check the position of the sprocket.

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MACHINE OPERATIONS AND CONTROLS OPERATION

• When sprocket (A) is at the rear of the machine:

Start the machine either by pulling levers (5) backward
slowly or by depressing the rear parts of pedals (6)
slowly.

• When sprocket (A) is at the front of the machine:

Start the machine either by pushing levers (5) forward
slowly or by depressing the rear parts of pedals (6)
slowly.
4. When traveling, check that the alarm sounds normally.
If the travel alarm does not sound, contact your Komatsu
distributor for repair.

REMARK
In low temperatures, if the machine travel speed is not normal, thoroughly perform the warm-up operation.
In addition, if the undercarriage is packed with mud and the machine travel speed is not normal, remove the soil
and mud from the undercarriage.

METHOD FOR STOPPING MACHINE

Avoid a sudden stop. Stop the machine gradually.
Set right and left travel levers (1) in NEUTRAL position (N).
The machine stops.

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METHOD FOR STEERING MACHINE

METHOD FOR STEERING (CHANGE THE DIRECTION) MACHINE
k WARNING
Before operating the travel levers or travel pedals, check the direction that the track frame is facing (the
position of the sprocket).
When the sprocket is at the front, the directions of operations of the travel levers or control pedals are
the opposite to the direction of movement of the machine.

Use the travel levers to change direction.

Avoid sudden changes of direction to travel as much as possible. Especially when performing counter-rotation
turn (spin turn), stop the machine before turning.
Operate 2 travel levers (1) as follows.

PIVOT TURN
When turning LEFT
• (A): Turning FORWARD LEFT
Push the right travel lever forward.
The machine turns forward LEFT.
• (B): Turning REVERSE LEFT
Push the right travel lever backward.
The machine turns in reverse LEFT.
REMARK
When turning to the RIGHT, read the preceding procedure by
replacing the word "LEFT" with "RIGHT", then operate the left
travel lever.

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CHANGE DIRECTION OF MACHINE

When turning LEFT during straight travel
• (A): Forward left turn
Return the left travel lever from FORWARD to NEUTRAL
position.
The machine turns forward LEFT.
• (B): Reverse left turn
Return the left travel lever from REVERSE to NEUTRAL
position.
The machine turns in reverse LEFT.
REMARK
When turning to the forward RIGHT, return the right travel lever
from FORWARD to NEUTRAL position. When turning to the re-
verse RIGHT, return the right travel lever from REVERSE to
NEUTRAL position.

COUNTER-ROTATION TURN
• Counter-rotation turn to left
• 1. Pull the left travel lever toward you.
2. Push the right travel lever forward.
The machine make a counter-rotation turn to the left.
• Counter-rotation turn to right
• 1. Pull the right travel lever toward you.
2. Push the left travel lever forward.
The machine make a counter-rotation turn to the right.

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METHOD FOR SWINGING MACHINE

k WARNING
• The tail of the machine extends outside the tracks.
Check that there is no one around the machine before
operating the swing.
• If the travel levers are operated when the engine speed
is decreased by the auto-deceleration function, the en-
gine speed will suddenly increase. Operate the levers
carefully.

When swinging the upper structure, do as follows.

1. Before swinging, turn swing lock switch (1) OFF (can-
celed).
(a): ON position
(b): OFF position
2. Check that swing lock pilot lamp (2) is not lit.

3. Operate L.H. work equipment control lever (3) to swing the

upper structure.
(A): Swing LEFT
(B): Swing RIGHT

4. When not performing the swing, turn swing lock switch (1)
ON (activated).
(a): ON position
(b): OFF position
5. Check that swing lock pilot lamp (2) is lit.

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MACHINE OPERATIONS AND CONTROLS OPERATION

METHOD FOR OPERATING WORK EQUIPMENT

k WARNING
If the levers are operated when the engine speed is decreased by the auto-deceleration function, the en-
gine speed will suddenly increase. Operate the levers carefully.

Use the R.H. and L.H. work equipment control levers to operate the work equipment.
When the levers are released, they return to NEUTRAL position and the work equipment is held in that position.
• Arm control
Move the L.H. work equipment control lever back and
forth.
You can operate the arm.

• Swing control
Move the L.H. work equipment control lever to the right
and left.
The upper structure swings.

• Boom control
Move the R.H. work equipment control lever back and
forth.
You can operate the boom.

• Bucket control
Move the R.H. work equipment control lever to the right
and left.
You can operate the bucket.

If the work equipment control levers are returned to NEUTRAL position when the machine is stopped, even if
the fuel control dial is set to High idle (MAX) position, the auto-deceleration mechanism works to reduce the en-
gine speed to the low speed.

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OPERATION MACHINE OPERATIONS AND CONTROLS

REMARK
This machine is equipped with an accumulator in the control circuit. Even if the engine is stopped, if the starting
switch key is turned to ON position within 15 seconds after stopping the engine, and the lock lever is set to
FREE position, it is possible to use the lever operation to lower the work equipment to the ground.
This procedure can also be used for releasing the remaining pressure in the hydraulic cylinder circuits or for
lowering the boom after loading the machine onto a trailer.

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HANDLE WORKING MODE

METHOD FOR SELECTING WORKING MODE
Use working mode selector switch (1) to select the working
mode that matches the operating conditions or purpose. This
will make it possible to perform operations efficiently.
Use the following procedure to select the most efficient working
mode.
When the starting switch is turned ON, the working mode is set
to the mode that was in operation when the starting switch was
last turned OFF.
Use the working mode selector switch to set the mode to the
most efficient mode to match the type of work.

Working
Applicable operations
mode
Normal digging or loading operations
P mode
(production conscious operation)
Normal digging or loading operations
E mode
(fuel consumption conscious operation)
L mode Positioning operations (fine control operations)
B mode Breaker operations
Operations of double-acting attachment on crush-
ATT/P mode er
(production conscious operation)
Operations of double-acting attachment on crush-
ATT/E mode er
(fuel consumption conscious operation)

NOTICE
If breaker operations are performed in a mode other than the breaker mode, there is danger of breakage
of the hydraulic equipment. Do not perform breaker operations in any mode except the breaker mode.
Set the working mode according to the following procedure.
1. Press working mode selector switch (1).
The screen changes to the working mode selection
screen.

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OPERATION MACHINE OPERATIONS AND CONTROLS

2. Press working mode selector switch (1) or function switch

F3 or F4 to select the appropriate mode.

3. Select a desired working mode and press function switch

F6. The change is entered and the screen returns to the
standard screen.
If function switch F5 is pressed, the screen returns to the
standard screen without changing the mode.

• If a working mode is selected, and nothing is done for 5 seconds, the selected working mode is auto-
matically accepted and the screen returns to the standard screen.
• If a working mode is selected and working mode selector switch (1) is kept pressed, the selected mode
is accepted and the screen returns to the standard screen.
• If the breaker mode is selected, "Really Set Breaker
Mode?" is displayed on the screen.
When setting to the breaker mode, press function
switch F6.
If function switch F5 is pressed, the screen returns to
the working mode selection screen.

METHOD FOR USING ONE-TOUCH POWER MAXIMIZING FUNCTION

The operating power can be increased by a single touch during operation. Make effective use of this function
whenever necessary in combination with the working mode.
Press the L.H. knob switch once and keep it pressed.
The operating power increases as long as the switch is press-
ed.
REMARK
However, the increased power is automatically stopped after
8.5 seconds.
This function is not actuated when the working mode is set to L
mode or B mode.

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MACHINE OPERATIONS AND CONTROLS OPERATION

PROHIBITED OPERATIONS
k WARNING
• Do not operate the work equipment control lever when the machine is traveling.
• If any lever is operated when the auto-deceleration is being actuated, the engine speed will sudden-
ly increase, so be careful when operating.

PROHIBITION OF OPERATIONS USING SWING FORCE

Do not use the swing force to compact soil or break objects.
This is not only dangerous, but also drastically reduces the life
of the machine.

PROHIBITION OF OPERATIONS USING TRAVEL FORCE

Do not use the travel force to perform excavation by digging
the bucket into the ground. This damages the machine or work
equipment.

PROHIBITION OF OPERATIONS USING HYDRAULIC CYLINDERS TO STROKE

END
If the work equipment is used with the cylinder rod operated to
its stroke end, and given impact by some external force, the hy-
draulic cylinders may be damaged, causing personal injury. Do
not perform operations with the hydraulic cylinder fully retracted
or fully extended.

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PROHIBITION OF OPERATIONS USING BUCKET DROPPING FORCE

Do not use the dropping force of the machine for digging, nor
use the dropping force of the bucket as a mattock, breaker, or
pile driver. This will drastically reduce the life of the machine.

PROHIBITION OF OPERATIONS USING BUCKET AS LEVER

Do not put the bucket back to a rock and use it as a lever to
dig. This can apply an excessive force to the chassis and buck-
et, and the machine may break.
In this case, dig by using only the force of the arm or bucket. If
an excessive force is applied, the safety valve of the hydraulic
system controls it into a proper range to prevent breakage of
the machine.

PROHIBITION OF OPERATIONS USING MACHINE DROPPING FORCE

Do not use the dropping force of the machine for digging.

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MACHINE OPERATIONS AND CONTROLS OPERATION

PROHIBITION OF DIGGING OPERATION AT AN ANGLE WITHOUT ENGAGING

TEETH
If the machine swings and digs simultaneously while the bucket
blade does not bite into hard rocks at a position higher than the
machine, the teeth slide down on the rock surfaces. As a result,
large vibration occurs in the machine and can crack the work
equipment or frame.
If the bucket blade slides and collides with a rock, an excessive
impact load occurs in the work equipment and frame and can
shorten the service life of the machine.

PROHIBITION OF DIGGING OPERATION ON HARD ROCKY GROUND

Do not attempt to directly excavate hard rocky ground with the work equipment. It is better to excavate it after
breaking up by some other means. This will not only save the machine from damage but will make for better
economy.

PROHIBITION OF OPERATIONS WHEN MACHINE IS NOT STABLE

If the machine is operated while its undercarriage is unstable,
torsional loads occur in the frames and can shorten the service
life of the machine.

In this case, prepare an embankment, etc. in front of the track

to stabilize the machine.

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PROHIBITION OF SWINGING OR TRAVELING WHEN ROCK IS ON TOP OF

TRACK ASSEMBLY
If the machine travels or swings with crushed stones, soil, or
sand on the track, they hit and damage the undercover and
frame. In the worst case, the hydraulic components are dam-
aged and a serious accident can result.
During operation, keep checking the track top for crushed
stones, soil, and sand.

PROHIBITION OF SUDDEN LEVER OR PEDAL SHIFT DURING HIGH SPEED

TRAVEL
(1) Do not operate the levers and pedals suddenly nor take any
other action to move the machine quickly.
(2) Do not operate the levers or pedals suddenly from FOR-
WARD (A) to REVERSE (B) (or from REVERSE (B) to FOR-
WARD (A)).
(3) Do not operate the levers or pedals suddenly (do not re-
lease them suddenly) to stop the machine when driving it at
high speed.

PROHIBITION OF HIGH-SPEED TRAVEL OPERATIONS ON ROUGH GROUND

If the machine travels on rough ground (rock-bed, etc.) at high
speed, large push-up loads are applied to the chassis, thus the
service life of the chassis is shortened.

When driving on rough ground (rock-bed, etc.), direct the idler

(1) having the cushion mechanism in the travel direction and
drive the machine at low speed.

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MACHINE OPERATIONS AND CONTROLS OPERATION

DO NOT TRAVEL LONG -TIME CONTINUOUSLY

If the machine travels continuously at high speed for 1.5 hours
or more, the temperature of lubricating oil inside the track roll-
ers and final drive will rise up. This may cause breakage to the
oil seal or leakage of oil.
When traveling continuously for a long time, stop the machine
for 30 minutes every 1.5 hours for the lubricating oil inside the
track rollers and final drive to cool down.
If the machine travels continuously for a long time with the
tracks loosened, it may break the undercarriage parts.
When driving the machine for a long time, check the track ten-
sion every 1.5 hours and adjust any looseness.
For the adjustment, see MAINTENANCE, “METHOD FOR CHECKING AND ADJUSTING TRACK TENSION
(4-28)”.

PRECAUTIONS FOR OPERATION

PRECAUTIONS FOR TRAVELING
Traveling over boulders, tree stumps, or other obstacles will
cause a big shock to the chassis (and in particular to the under-
carriage), and this will cause damage to the machine. For this
reason, always remove any obstacles or drive the machine
around them, or take other steps to avoid traveling over such
obstacles as far as possible.
If there is no way to avoid traveling over an obstacle, reduce
the travel speed, keep the work equipment close to the ground,
and try to drive the machine so that the center of the track
passes over the obstacle.

PRECAUTIONS FOR HIGH SPEED TRAVEL

On uneven roadbeds such as rock beds or uneven roads with large rocks, drive the machine at Lo-speed. When
driving the machine at Hi-speed, set the idler in the forward direction.
• Each time travel speed selector switch (1) is pushed, travel
speed changes repeatedly as Lo → Mi → Hi → Lo. The
travel speed (Lo, Mi, Hi) is displayed on travel speed dis-
play (2).

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OPERATION MACHINE OPERATIONS AND CONTROLS

PERMISSIBLE DEPTH OF WATER, SOIL AND DIRT

NOTICE
When driving the machine out of water, if the angle of the
machine exceeds 15 °, the rear of the upper structure will
go under water, and water will be thrown up by the cooling
fan. This may cause the fan to break. Be extremely careful
when driving the machine out of water.

Do not drive the machine in water or soil or sand deeper than

the center of upper carrier roller (1).
After the job, be sure to supply grease to the parts which have
been under water for a long time until the used grease is pro-
jected. (Around the bucket pin, in particular)

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PRECAUTIONS FOR WORKING ON SLOPE

k WARNING
• Swinging operations or operating the work equipment
on slopes machine may lose its balance and turn over.
Avoid such operations as much as possible.
It is particularly dangerous to swing downhill when the
bucket is loaded.
It is unavoidable to perform such operations, pile soil
to make a platform (A) on the slope so that the ma-
chine can be horizontal.
• Do not work or travel on a slope covered with the steel
plates. Even with slight slopes there is a hazard that
the machine may slip.
• Do not travel up or down on steep slopes. There is a
danger that the machine may turn over.
• When traveling, raise the bucket approximately 20 to
30 cm {7.9 to 11.8 in}  above the ground.
Do not travel downhill in reverse.
• Never turn on slopes or travel across slopes.
Always go down to a flat place to perform these opera-
tions. It may be a longer way, but it will ensure safety.
• Always operate or travel in such a way that it is possi-
ble to stop safely at any time if the machine slips or
becomes unstable.
• When traveling uphill, if the shoes slip or it is impossi-
ble to travel uphill using only the force of the tracks,
do not use the pulling force of the arm to help the ma-
chine travel uphill. There is danger that the machine
may tip over. Accordingly, don't travel uphill with this
method.
• Never perform swing operation on a slope by using
the left work equipment control lever if the engine
stops. The upper structure will swing under its own
weight.
• Do not open or close the door when the machine is on
a slope. The operating effort may suddenly change. Al-
ways lock the doors of the operator's compartment in
position regardless of whether it is open or closed.

1. When traveling down steep hills, use the travel lever and
fuel control dial to keep the travel speed low.
When traveling down a steep hill of more than 15°, set the
work equipment to the posture shown in the figure, and
travel at low engine speed.

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OPERATION MACHINE OPERATIONS AND CONTROLS

2. When traveling up a steep hill of more than 15°, set the

work equipment to the posture shown in the figure.

When traveling up a steep slope, extend the work equip-

ment to the front to improve the balance, keep the work
equipment approximately 20 to 30 cm {7.9 to 11.8 in} 
above the ground, and travel at low speed.

Braking on downhill slope

Put the travel lever in NEUTRAL position. This will cause the brake to be automatically applied.
If engine stops on slope
If the engine stops when traveling uphill, move the travel levers to NEUTRAL position, lower the bucket to the
ground, stop the machine, then start the engine again.
Pay attention to DEF level
Before working on a slope or traveling on a rough ground, check DEF tank and add sufficient amount of DEF as
necessary. If the remaining DEF level becomes low, sudden drop of its level or abnormality in urea SCR system
may be detected. If DEF level caution lamp or DEF system caution lamp lights up in red, move the machine to a
level place immediately and add DEF.

METHOD FOR ESCAPING FROM MUD

Always operate carefully to avoid getting stuck in mud. If the machine does get stuck in mud, do as follows to
get the machine out.
Set the machine push-up switch to the high-pressure setting
position (b).
The machine can easily get out since the boom pressing force
against ground increases.

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MACHINE OPERATIONS AND CONTROLS OPERATION

Track on one side stuck

NOTICE
When using the boom or arm to raise the machine, push
the ground by using the bottom of the bucket.
At this time, set the angle between the boom and the arm
at 90° to 110° and lower the bucket bottom surface to the
ground.
The same applies when using the bucket installed in the
reverse direction.
When only one side is stuck in mud, raise the track by lowering
the bucket to the ground on the stuck side. Lay boards or logs
under the raised track. Then raise the bucket and drive the ma-
chine out.

Tracks on both sides stuck

When the tracks on both sides get stuck and slip, lay logs,
wooden blocks, etc. according to the preceding procedure.
Stick the bucket into the front ground, pull in the arm as in dig-
ging operation, and set the travel lever to FORWARD position
to drive the machine out.

RECOMMENDED APPLICATIONS
In addition to the following, it is possible to further increase the range of applications by using various attach-
ments.

DIGGING WORK
BACKHOE WORK
It is suitable for excavating areas that are lower than the machine.
When the condition of the machine is as shown in the figure
(angle between bucket cylinder and link, and between arm cyl-
inder and arm is 90 °), the maximum excavation force is ob-
tained from the pushing force of each cylinder.
When excavating, you can optimize your working efficiency by
using this angle effectively.

The range for excavating with the arm is from a 45 ° angle
away from the machine to a 30 ° angle towards the machine.
There may be some differences depending on the excavation
depth, but try to stay within the above range rather than operat-
ing the cylinder to the end of its stroke.

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SHOVEL WORK
NOTICE
The rock bucket cannot be used for shovel work in the
turned position since it interferes with the arm.
It is suitable for excavating at a position higher than the ma-
chine.
Shovel work is performed by attaching the bucket in the re-
verse direction.

DITCHING WORK
Ditching work can be performed efficiently by attaching a buck-
et which matches the digging operation and then setting the
tracks parallel to the line of the ditch to be excavated.
To excavate a wide ditch, first dig both sides and then finally re-
move the center portion.

LOADING WORK
In places where the swing angle is small, work efficiency can
be enhanced by locating the dump truck in a place easily visi-
ble to the operator.
Loading is easier and capacity greater if you begin from the
front of the dump truck body than if loading is done from the
side.

EFFECTIVE USE OF HYDRAULIC EXCAVATOR

Operation for reducing fuel consumption
(Carbon dioxide emissions reducing operation)
The operating methods for reducing fuel consumption are as follows.
• Avoiding unnecessary engine idle running
• Avoiding hydraulic relief
• Running at low engine speed
• Reduction at high position
• Operation at minimum swing angle
• Traveling at low engine speed
We can provide our users the training for operating methods to increase the productivity and to reduce the fuel
consumption. Contact your Komatsu distributor for details.

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METHOD FOR REPLACING AND INVERTING BUCKET

k WARNING
• When pins are knocked in with a hammer, pieces of metal may fly and cause serious injury.
When performing this operation, always wear protective eyeglasses, hard hat, gloves, and other
protective equipment.
• Place the removed bucket in a stable condition.
• The pin is hit with a strong force to remove, so the pin may fly out and injure people in the sur-
rounding area. Make sure that there is no one in the surrounding area before starting the work.
• When pulling out the pins, do not stand behind the bucket. In addition, take extreme care not to put
your foot under the bucket since the bucket may fall and cause serious injury.
• When removing or inserting pins, be extremely careful not to get your fingers caught.
• Never insert your fingers into the pin holes when aligning the holes.

Stop the machine on a firm and flat surface and do the work. When performing joint work, appoint a leader and
follow that person's instructions and signals.

METHOD FOR CHANGING BUCKET

Replace the bucket according to the following procedure.
1. Lower the bucket to the flat surface of the ground.
NOTICE
After removing the pins, make sure that mud or sand does not get on them. Dust seals are fitted at
both ends of the bushings, be careful not to damage them.
REMARK
When removing the pins, place the bucket so that it is in light contact with the ground.
If the bucket is lowered strongly to the ground, the resistance will be increased and it will be difficult to re-
move the pins.
2. Remove the double nuts on the stopper bolt for arm pin (A)
and link pin (B), remove the bolt, pull out arm pin (A) and
link pin (B), and then remove the bucket.

3. Align the pin hole of arm (1) with replacement bucket hole (2), then align the pin hole of link (3) with hole
(4), and install pins (A) and (B) which are coated with grease.

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OPERATION MACHINE OPERATIONS AND CONTROLS

REMARK
When installing the bucket, for arm pin part (A), fit O-ring
(5) to bucket (6) in the position shown in the figure. After
inserting the pin, fit it in the regular groove. For link pin part
(B), install the bucket with O-ring (5) fitted in the regular
groove.
4. Install the stopper bolts and nuts for each pin, then grease
the pins.
REMARK
• Lubricate with grease thoroughly until the grease
comes out from the end faces.
• When replacing the bucket, replace the dust seal with
a new one if it is damaged. If a damaged one is used
without being replaced, sand and dirt may enter the
part of pin and cause abnormal wear of the pin.

METHOD FOR INVERTING BUCKET

NOTICE
The rock bucket cannot be used for shovel work in the inverted position since it interferes with the arm.
Invert the bucket according to the following procedure.
1. Lower the bucket to the flat ground.
REMARK
When removing the pins, place the bucket so that it is in light contact with the ground.
If the bucket is lowered strongly to the ground, the resistance will be increased and it will be difficult to re-
move the pins.
NOTICE
After removing the pins, make sure that mud or sand does not get on them. Dust seals are fitted at both
ends of the bushings, be careful not to damage them.
2. Remove the double nuts on the stopper bolt for arm pin (A)
and link pin (B), remove the bolt, pull out arm pin (A) and
link pin (B), and then remove the bucket.

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MACHINE OPERATIONS AND CONTROLS OPERATION

3. Invert the removed bucket.

4. Align the pin hole of arm (1) with replacement bucket hole
(2), then align the pin hole of link (3) with hole (4), and in-
stall pins (A) and (B) which are coated with grease.

REMARK
When inverting, do not install O-rings. Keep them until the next use.
5. Install the stopper bolts and nuts for each pin, then grease the pins.
REMARK
• Lubricate with grease thoroughly until the grease comes out from the end faces.
• When replacing the bucket, replace the dust seal with a new one if it is damaged. If a damaged one is
used without being replaced, sand and dirt may enter the part of pin and cause abnormal wear of the
pin.

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METHOD FOR PARKING MACHINE

k WARNING
• Avoid a sudden stop. Stop the machine gradually.
• Place the machine on a firm and level place.
Do not park the machine on a slope.
If it is unavoidably necessary to park the machine on a
slope, block the tracks from movement. As an addi-
tional safety measure, thrust the bucket into the
ground.
• If the control lever is touched by accident, the machine
may move suddenly, and this may lead to a serious
personal injury or death. Always set the lock lever se-
curely to LOCK position before leaving the operator's
seat.

1. Put right and left travel levers (1) in NEUTRAL position.

The machine stops.

2. Turn fuel control dial (2) to Low idle (MIN) position and
lower the engine speed.

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MACHINE OPERATIONS AND CONTROLS OPERATION

3. Lower the bucket horizontally until the bottom touches the

ground.

4. Set lock lever (3) in LOCK position (L).

5. Check the engine coolant temperature and engine oil pres-

sure with the machine monitor.
• If the engine coolant temperature gauge is in the red
range, cool down the coolant until the gauge enters
the green range, and stop the engine. Then, inspect
and take necessary remedy according to “TROUBLES
AND ACTIONS (3-271)”.
• If the engine oil pressure caution lamp is lit, stop the
engine immediately. Then, inspect and take necessary
remedy according to “TROUBLES AND ACTIONS
(3-271)”.
6. Stop the engine.
For the stopping procedure of the engine, see “METHOD FOR STOPPING ENGINE (3-198)”.

METHOD FOR CHECKING AFTER FINISHING WORK

After finishing the work, always perform the following check and cleaning.
1. Walk around the machine and check the work equipment, machine exterior, and undercarriage, also check
for any leakage of oil or coolant. If any problems are found, repair them.
2. Fill the fuel tank.
3. Check the engine compartment for paper and debris. Clean out any paper and debris to avoid a fire hazard.
4. Remove mud, etc. from the undercarriage, if any.

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OPERATION MACHINE OPERATIONS AND CONTROLS

LOCK
Lock position
Always lock the following places.
(1) Operator's cab door
Always close the window.
(2) Fuel tank filler port
(3) Engine hood
(4) Battery box cover
(5) Left side door of the machine
(6) Right side door of the machine
(7) Hydraulic tank filler port
(8) Air conditioner FRESH air filter intake port
(9) DEF tank filler cap cover
REMARK
Use the starting switch key to lock and unlock all these places.

METHOD FOR OPENING AND CLOSING CAP WITH LOCK

PROCEDURE FOR OPENING CAP WITH LOCK
1. Insert the key into the key slot.
2. Turn the key clockwise, align the matching marks (1) of the
key groove and the cap, then open the cap.
Position (A): OPEN
Position (B): CLOSE (LOCK)

PROCEDURE FOR CLOSING CAP WITH LOCK

1. Screw in the cap until it becomes tight, then insert the key into the key slot.
2. Turn the starting switch key to CLOSE position (B), then remove the key.

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METHOD FOR OPENING AND CLOSING COVER WITH LOCK

METHOD FOR OPENING COVER WITH LOCK
1. Insert the key into the key slot.
2. Turn the key counterclockwise and open the cover by pulling the cover handle.
Position (A): OPEN
Position (B): LOCK

METHOD FOR LOCKING COVER WITH LOCK

1. Close the cover and insert the key into the key slot.
2. Turn the starting switch key to CLOSE position (B), then remove the key.

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METHOD FOR OPENING AND CLOSING ENGINE HOOD

k CAUTION
• When opening or closing the engine hood, place the machine on a level ground, lower the work
equipment to the ground, stop the engine, then perform the operation.
• When opening the engine hood, do not release the handle until the stay is set in the lock position
securely.
• When closing the engine hood, hold the handle securely since the engine hood may move down be-
cause of its own weight.
If the engine hood is not locked, it may close suddenly because of wind, etc.
• Immediately after the engine is stopped, the engine hood and after-treatment devices are still hot.
Accordingly wait until they have cooled down before opening or closing the engine hood.

METHOD FOR OPENING ENGINE HOOD

1. Insert the key into the key slot.
2. Turn the key counterclockwise (A) and remove it.
Position (A): OPEN
Position (B): LOCK
3. Pull lever grip (1) and remove the bottom of the lever from
the hook.
4. Similarly, remove the left lever from the hook according to
step 3.
5. Hold hood handle (2) and pull up to open the hood.

METHOD FOR LOCKING ENGINE HOOD

1. Hold hood handle (2) and lower the hood.
2. Hitch the bottom of the right and left levers to the hooks, and press lever grips (1) inward to close the hood.
3. Insert the key into the key slot.
4. Turn the key clockwise (B) and remove it.
(A): OPEN
(B): CLOSE

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METHOD FOR OPENING AND CLOSING DEF TANK FILLER CAP COVER
k CAUTION
• When opening or closing the DEF tank filler cap cover, place the machine on a level place, lower the
work equipment to the ground, stop the engine, then perform the operation.
• When opening it, do not release the handle until the stay is set in the lock position securely.
• When closing it, hold the handle securely since the DEF tank filler cap cover may move down be-
cause of its own weight.
If it is not locked, it may close suddenly because of wind, etc.

METHOD FOR OPENING DEF TANK FILLER CAP COVER

1. Insert the key into the key slot.
2. Turn the key counterclockwise and remove it.
Position (A): OPEN
Position (B): CLOSE (LOCK)
3. Release lock (1).
4. Hold rubber handle (2) and pull up to open.

5. Set stay (3) securely in position (4) to lock it.

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OPERATION MACHINE OPERATIONS AND CONTROLS

METHOD FOR LOCKING DEF TANK FILLER CAP COVER

1. Pull stay (3) toward you and unlock the stay.
2. Lower the cover.
3. Turn the key clockwise to lock, and remove it.
Position (A): OPEN
Position (B): CLOSE (LOCK)

METHOD FOR OPENING AND CLOSING CAB DOOR

When opening the door (locked door)
1. Insert the key into the key slot.
2. Turn the key clockwise to unlock the key, then open the door handle.
Position (A): OPEN
Position (B): CLOSE (LOCK)

When locking the door

1. Close the door and insert the key into the key slot.
2. Turn the starting switch key to CLOSE position (B), then remove the key.

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HANDLE AIR CONDITIONER OPERATION

HANDLE AIR CONDITIONER

NOTICE
• When performing running-in of the air conditioner, always start with the engine running at low
speed. Never start the air conditioner when the engine is running at high speed. It will cause failure
of the air conditioner.
• If water gets into the control panel or sunlight sensor, it may lead to failure. Take care not to let wa-
ter get on them. In addition, never bring any open flame near them.
• For the auto function of the air conditioner to work properly, always keep the sunlight sensor clean.
Do not leave anything around the sunlight sensor that may interfere with its sensor function.
When the air conditioner is not used every day, to prevent loss of the film of oil at various parts, run the air con-
ditioner with the engine at low speed from time to time and perform cooling or dry heating for several minutes.
When the temperature inside the cab is low, the air conditioner may not work. In this case, circulate recirculation
air to warm the inside of the cab. After that, turn the air conditioner switch ON, the air conditioner will work.
If any abnormality is detected in any equipment or sensor used
on the air conditioner, the air conditioner system caution lamp
lights up on the monitor screen. If the air conditioner system
caution lamp lights up, ask your Komatsu distributor for inspec-
tion and repair.

Ventilation
• When running the air conditioner for a long time, turn the lever to FRESH position once an hour to perform
ventilation and cooling.
• If you smoke when the air conditioner is on, the smoke may hurt your eyes. In such case, open the window
and turn the lever to FRESH for a while for ventilation and driving smoke out.
Temperature control
For reasons of health, it is said that the optimum setting for cooling is the temperature when it feels slightly cool
(5 or 6°C lower than the ambient temperature) when you enter the cab.
Be careful to select the appropriate temperature.

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OPERATION HANDLE AIR CONDITIONER

EXPLANATION OF AIR CONDITIONER EQUIPMENT

(1) OFF switch (6) FRESH/RECIRC air selector switch

(2) Fan switch (7) Display monitor
(3) Temperature control switch (8) Air conditioner switch
(4) Vent selector switch (9) Sunlight sensor
(5) Auto switch

OFF SWITCH
This switch is used for stopping the fan and air conditioner.
REMARK
Even if this OFF switch is pressed, the monitor screen does not
switch to the air conditioner adjustment screen.

FAN SWITCH
You can adjust the air flow by using the fan switch.
The air flow can be adjusted to 6 levels.
• Press the △ switch to increase the air flow; press the ▽
switch to decrease the air flow.
• During auto operation, the air flow is automatically adjust-
ed.

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HANDLE AIR CONDITIONER OPERATION

Monitor display and air flow

Monitor display Air flow rate
Air flow "low"

Air flow "medium 1"

Air flow "medium 2"

Air flow "medium 3"

Air flow "medium 4"

Air flow "high"

TEMPERATURE SET SWITCH

Use the temperature set switch to adjust the temperature inside
the cab. The temperature can be set between 18 °C {64.4 °F} 
and 32 °C {89.6 °F} .
• Press the △ switch to raise the set temperature; press the
▽ switch to lower the set temperature.
The set temperature is indicated on the display monitor.
• The temperature is generally set at 25 °C {77 °F} .
• The temperature can be set in stages of 0.5 °C {32.9 °F} .

Monitor display and function

Monitor display Set temperature
18.0 °C {64.4 °F}  Max. cooling
18.5 to 31.5 °C {65.3 to
Adjusts temperature inside cab to set temperature
88.7 °F} 
32.0 °C {89.6 °F}  Max. heating

REMARK
If the mode is set to auto mode and the temperature setting is set to 18.0 °C {64.4 °F}  or 32.0 °C {89.6 °F} , the
air flow from the fan is always set to HIGH and does not change even when the temperature reaches the set
value.

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OPERATION HANDLE AIR CONDITIONER

VENT SELECTOR SWITCH

The vent selector switch is used to select the vents.
• When vent selector switch is pressed, the LC display on
the monitor display switches and air blows out from the
vents displayed.
• During automatic operation, the vents are automatically
selected.

(A): Rear vent (4 places)

(B1): Face vent (1 place)
(C): Foot vent (1 place)
(D): Front window glass vent (2 places)
(B2): Front window glass vent (1 place)
Air blows out from the vents marked with ○.

Vent
LCD display Air vent mode Remarks
(A) (B) (C) (D)
Front vent Not selected in auto mode
○

Front and rear vents -

○ ○

Front, rear, and foot vents -

○ ○ ○

Foot vent -
○

Foot vent Not selected in auto mode

○ ○
Defroster vent
Defroster vent Not selected in auto mode
○

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HANDLE AIR CONDITIONER OPERATION

AUTO SWITCH
Use the auto switch for automatic selection of the air flow,
vents, and air source (FRESH/RECIRC) according to the set
temperature.
• Press this switch, then use temperature control switch (1)
to set the temperature, and run the air conditioner under
automatic control.
• When switching from automatic operation to manual oper-
ation, it is possible to use the switches to select the vents
and air source (FRESH/RECIRC).
REMARK
When Auto Mode is selected, if the set temperature is set to
18.0 °C {64.4 °F}  or 32.0 °C {89.6 °F} , the air flow is always
set to High, but this is not a problem.

FRESH/RECIRC AIR CHANGEOVER SWITCH

Use FRESH/RECIRC air selector switch to switch the air
source between recirculation of the air inside the cab and in-
take of fresh air from the outside.
During automatic operation, the selection of inside air (RE-
CIRC) and outside air (FRESH) is performed automatically.
RECIRC
Outside air is shut off and only air inside the cab is circulated.
Use this setting to perform rapid cooling of the cab or when
outside air is dirty.
FRESH
Outside air is taken into the cab.
Use this setting to take in fresh air or to demist the window glass.

DISPLAY MONITOR
This monitor display indicates the status of temperature setting
(a), air flow rate (b), and vents (c).

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OPERATION HANDLE AIR CONDITIONER

When OFF switch (1) is pressed, the display of temperature

setting (a) and air flow rate (b) goes out, and operation stops.

AIR CONDITIONER SWITCH

Use air conditioner switch for turning the air conditioner (cool-
ing, dry heating) ON or OFF.
• Press air conditioner switch when the fan is operating
(when display (b) is shown on the display monitor). The air
conditioner is switched ON and starts to work. Press the
switch again to stop the air conditioner.
• Air conditioner cannot be operated while the fan is stop-
ped.

SUNLIGHT SENSOR
Sunlight sensor automatically adjusts the flow of air from the
vents to match the strength of the sun's rays. In addition, it au-
tomatically detects changes in the temperature inside the cab
caused by changes in the strength of the sun's rays beforehand
and automatically adjusts the temperature.

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HANDLE AIR CONDITIONER OPERATION

METHOD FOR OPERATING AIR CONDITIONER

The air conditioner can be operated automatically or manually. Select the method of operation as desired.

METHOD FOR AUTOMATIC OPERATION

1. Turn auto switch (1) ON.

Set temperature (a) and air flow (b) are displayed.

2. Use temperature control switch (2) to set to the desired

temperature.
The air flow, combination of vents, and selection of fresh or
recirculated air is automatically selected according to the
set temperature, and the air conditioner is operated auto-
matically to provide the set temperature.

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OPERATION HANDLE AIR CONDITIONER

REMARK
When vent monitor (c) displays (d) or (e), and engine coolant
temperature is low, the air flow is automatically limited to pre-
vent cold air from blowing out.

METHOD FOR STOPPING AUTOMATIC OPERATION

Press OFF switch (1).
The air conditioner stops.

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HANDLE AIR CONDITIONER OPERATION

METHOD FOR MANUAL OPERATION

1. Press fan switch (1) and adjust the air flow.

When doing this, check that temperature setting (a) and air
flow (b) are displayed on the monitor.

2. Turn air conditioner switch (2) ON.

3. Use temperature control switch (3) to set to the desired

temperature.

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OPERATION HANDLE AIR CONDITIONER

4. Press vent selector switch (4) and select the desired vents.

When this is done, the display for vent (c) of the monitor
changes according to the selection.

5. Press FRESH/RECIRC air selector switch (5) and select

recirculation of the air inside the cab (RECIRC) or intake of
fresh air from outside (FRESH).

METHOD FOR STOPPING MANUAL OPERATION

Press OFF switch (1).
The air conditioner stops.

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HANDLE AIR CONDITIONER OPERATION

METHOD FOR OPERATING WITH COLD AIR TO FACE AND WARM AIR TO FEET
To operate with cold air blowing to the face and warm air blow-
ing to the feet, set as follows.

1. Press fan switch (1) and adjust the air flow.

When doing this, check that temperature setting (a) and air
flow (b) are displayed on the monitor.

2. Press vent selector switch (2) and set the vent display on
the monitor to the display shown in the figure.

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OPERATION HANDLE AIR CONDITIONER

3. Turn air conditioner switch (3) ON.

4. Adjust fan switch (1), temperature control switch (4) and

FRESH/RECIRC selector switch (5) to the desired posi-
tions.

3-241
HANDLE AIR CONDITIONER OPERATION

METHOD FOR OPERATING DEFROSTER

1. Press fan switch (1) and adjust the air flow.

When doing this, check that temperature setting (a) and air
flow (b) are displayed on the monitor.

2. Press vent selector switch (2) and set vent display on the
monitor to (f) or (g) as shown in drawing.

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OPERATION HANDLE AIR CONDITIONER

3. Press FRESH/RECIRC selector switch (3) and set it to

FRESH mode.

4. Press temperature control switch (4) and set temperature

on the monitor to 32.0 of maximum heating.

5. Adjust vents (A), (B1), and (B2) so that the air blows onto the window glass.
(Vents (C) and (D) are fixed and cannot be adjusted.)

6. When operating in the rainy season or when it is desired to

remove the mist from the window glass or to dehumidify
the air, turn air conditioner switch (5) ON.

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HANDLING RADIO OPERATION

HANDLING RADIO
• To ensure safety, always keep the volume to a level where you can hear the outside sounds during opera-
tion.
• If water gets into the speaker case or radio, it may lead to failure. Take care not to let water get on them.
• Do not wipe the display or buttons with solvent such as benzene or thinner. Wipe with a dry soft cloth.
• When the battery disconnect switch is turned to OFF position or the power for the machine is turned off for
the replacement of the battery, the clock may be initialized. In such a case, set it again.
For handling of the battery disconnect switch, see “BATTERY DISCONNECT SWITCH (3-120)”.

EXPLANATION OF RADIO EQUIPMENT

(1) Power button (5) Preset button

(2) Band/AUX selector button (6) Display selector button
(3) Volume control button (7) Sound control button
(4) Tuning/time adjustment button (8) Display

POWER BUTTON
Press the power button to supply the power to the radio and the frequency is shown on display. As long as AUX
is selected, display indicates AUX on it. Press the button again to turn the power off.

BAND/AUX SELECTOR BUTTON

Press band/AUX selector button to select the desired band or AUX.
Each time the button is pressed, the band changes FM → AM → AUX → FM...

VOLUME CONTROL BUTTON

Use the volume control button to control the volume.
Press the △ button, and the volume increases. Press the ▽ button, and the volume decreases. The range for
the volume is 0 to 32.
Hold down this button, and you can change the volume continuously.

TUNING/TIME ADJUSTMENT BUTTON

Use the tuning/time adjustment button to select frequency and step for sound adjustment and to adjust time.
For the adjusting method, see “METHOD FOR CONTROLLING RADIO (3-247)”.

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OPERATION HANDLING RADIO

PRESET BUTTON
If you register desired stations to the preset button beforehand, you can select each station by touching this but-
ton once.
It is possible to preset 6 stations each for both AM and FM.
For the presetting method, see “METHOD FOR CONTROLLING RADIO (3-247)”.

DISPLAY SELECTOR BUTTON

Use the display selector button to change frequency and clock shown on the display.
Each time you press this button, frequency, clock and band are shown on the display in this order.
If 1.5 seconds passes while a band is shown, a frequency will be displayed.
As long as AUX is selected, this button alternately switches the display between AUX and the clock.

SOUND CONTROL BUTTON

Press the sound control button, and the sound adjustment is ready.
Each time this button is pressed, BAL (Balance), TRE (Treble) and BAS (Bass) will be selected in this order.
If this button is pressed while BAS is displayed, the sound adjustment will be canceled.
For the sound adjusting method, see “METHOD FOR CONTROLLING RADIO (3-247)”.

DISPLAY
(A): Band name, “AUX”, frequency, clock and other character/
numeric information are displayed.
(B): Frequencies are displayed at steps of 50 kHz in certain
areas.
(C): Lights up when a stereo broadcasting is heard while a FM
station is selected.
(D): Lights up at the time of balance adjustment in the sound
adjusting condition.
(E): Lights up at the time of treble adjustment in the sound ad-
justing condition.
(F): Lights up at the time of bass adjustment in the sound adjusting condition.

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HANDLING RADIO OPERATION

AUX
NOTICE
• A stereo miniature plug can be connected.
• As a power source, use the battery attached to the equipment to connect.
If you use an electric power supply installed to the machine, the noise may occur.
• The noise may occur if you pull out the input plug when AUX is selected, or if you push in or pull
out the plugs of the equipment to connect.
You can hear the sound through the speaker of the machine when you connect a commercially available porta-
ble audio equipment to the machine.
1. Open cap (a).
2. Connect a portable audio equipment by using a commer-
cially available audio cable.

3. Press band/AUX selector button (1) to select “AUX”.

3-246
OPERATION HANDLING RADIO

METHOD FOR CONTROLLING RADIO

METHOD FOR ADJUSTING FREQUENCY
1. Press band/AUX selector button (1) and select FM or AM.
2. Press tuning/time adjustment button (2) to adjust the fre-
quency.
• Press the △ button, and the frequency increases;
press the ▽ button, and the frequency decreases.
• Hold down the △ button, and the frequency increases
continuously; hold down the ▽ button, and the fre-
quency decreases continuously.
• Hold down the △ button and release it, then the fre-
quency increases continuously. Hold down the ▽ but-
ton and release it, them the frequency decreases continuously as an auto seek.
When a proper frequency is picked up, the tuning automatically stops.

METHOD FOR ADJUSTING FREQUENCY (AUTO PRESETTING)

1. Press band/AUX selector button (1) and select FM or AM.
2. Hold down sound control button (2).

When a proper frequency is picked up, it is automatically registered to preset memories 1 to 6.

METHOD FOR CALLING PRESET

1. Press band/AUX selector button (1) and select FM or AM.
2. Press one of 1 to 6 of preset button (2).

The frequency registered in the preset number of the pressed button is called up and received.
“Example”
While a frequency is displayed, press button 1 of preset button (2), and the preset number “P-1” appears on the
display.
The preset number is shown for 0.5 seconds, and then the frequency is displayed.

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HANDLING RADIO OPERATION

METHOD FOR REGISTERING PRESET

Hold down one of 1 to 6 of preset button (1) while listening to
the radio.

The currently received frequency is registered to the preset number corresponding to the pressed button.
“Example”
While a frequency is displayed, keep pressing button 1 of preset button (1), and the preset number “P-1” is dis-
played.
After the preset number flashes 3 times, the frequency is displayed and then registered to preset number “P-1”.

METHOD FOR ADJUSTING SOUND BALANCE

1. Press sound control button (1) to light up “BAL” on the dis-
play.
You can adjust the sound (balance).
2. Press tuning/time adjustment button (2) to adjust the
sound (balance).
• Press the △ button, and the speaker output on the R
side increases by 1. (R1 to R7)
• Press the ▽ button, and the speaker output on the L
side increases by 1. (L1 to L7)

METHOD FOR ADJUSTING HIGH REGISTER RANGE (TREBLE)

1. Press sound control button (1) to light up “TRE” on the dis-
play.
You can adjust the high register range (treble) of the
sound.
2. Press tuning/time adjustment button (2) to adjust the high
register range (treble).
• Press the △ button, and the high register range (tre-
ble) level increases by 1. (Maximum + 7)
• Press the ▽ button, and the high register range (tre-
ble) level decreases by 1. (Minimum - 7)

METHOD FOR ADJUSTING LOW REGISTER RANGE (BASS)

1. Press sound control button (1) to light up “BAS” on the dis-
play.
You can adjust the low register range (bass) of the sound.
2. Press tuning/time adjustment button (2) to adjust the low
register range (bass).
• Press the △ button, and the low register range (bass)
level increases by 1. (Maximum + 7)
• Press the ▽ button, and the low register range (bass)
level decreases by 1. (Minimum - 7)

3-248
OPERATION HANDLING RADIO

METHOD FOR ADJUSTING CLOCK

1. Press display selector button (1) to display the clock.
2. Hold down display selector button (1) to flash the “HOUR”
display portion.
You can adjust the hour.
3. Press tuning/time adjustment button (2) to adjust the hour.
• If you press △ button, “HOUR” display increases by 1.
• If you press ▽ button, “HOUR” display decreases by
1.
4. Press display selector button (1) to flash the “MINUTE” dis-
play portion.
You can adjust the minute.
5. Press tuning/time adjustment button (2) to adjust the minute.
• If you press △ button, “MINUTE” display increases by 1.
• If you press ▽ button, “MINUTE” display decreases by 1.
6. Press display selector button (1) to cancel time adjustment.
The screen returns to clock display.

STOW ANTENNA
Before transporting the machine or putting it inside a building,
store the antenna (1) to prevent any interference.
1. Loosen mounting bolt (2) of antenna (1), and store anten-
na (1) to the bottom part.
2. After storing antenna (1), tighten bolt (2) to fix it.

3-249
TRANSPORTATION OPERATION

TRANSPORTATION
PRECAUTIONS FOR TRANSPORTING MACHINE
SELECT TRANSPORTATION METHOD
• When transporting the machine, choose the transportation method in reference to the weight and dimen-
sions shown in “SPECIFICATIONS (5-2)”.
Note that the weight and dimension given in “SPECIFICATIONS” (weight and dimension) may differ accord-
ing to the type of track shoe or arm, or other attachments.
• Consult your Komatsu distributor for details of the procedure for transporting machines with a protective
guard installed for the operator's cab.
• Consult your Komatsu distributor for handling of the handrails when transporting the machine.

3-250
OPERATION TRANSPORTATION

LOADING AND UNLOADING WITH TRAILER

PRECAUTIONS FOR LOADING AND UNLOADING WITH TRAILER
k WARNING
Always observe the following when loading or unloading
the machine from a trailer.
• Select the firm, level ground when loading or unload-
ing the machine.
Maintain a safe distance from the road shoulder
• Always turn the auto-deceleration switch OFF (cancel).
If the auto-deceleration switch is left ON, the machine
may suddenly move off at the start.
• Always set the travel speed switch to low speed (Lo),
run the engine at low idle, and operate the machine
slowly when loading or unloading the machine.
• Perform the warm-up operation thoroughly and make
sure that the engine speed is stable before performing
the loading or unloading the machine.
• Never correct your steering on the ramps. There is
danger that the machine may tip over.
If necessary, drive off the ramps or back on to the trail-
er and correct the direction.
• On the ramps, do not operate any lever except the
travel lever.
• It is dangerous to use the work equipment for loading
and unloading operations. Always use ramps.
• The center of gravity of the machine shifts suddenly at
the joint between the ramps and the trailer, and it is
dangerous that the machine loses its balance.
Accordingly, pass this point slowly.
• If it is necessary to swing the work equipment on the
trailer platform, the footing is unstable, so be extreme-
ly careful that the machine does not tip over.
If the work equipment is installed to the machine, pull
the work equipment in, and operate slowly to prevent
the machine from losing its balance.
• Position a flagman to give guidance to prevent the ma-
chine from coming off the ramps and to ensure safety
in the operation.
Always observe the following regarding the ramps and
trailer platform.
• Use ramps with ample width, length, thickness, and
strength and install them with a maximum slope of
15 °.
When using piled soil, compact the piled soil fully to
prevent the slope face from collapsing.
• Clean the machine tracks and ramps before starting in
order to prevent the machine from slipping on the
ramps.
There is danger of the machine slipping if there is wa-
ter, snow, grease, oil, or ice on the ramp surface.

3-251
TRANSPORTATION OPERATION

PROCEDURES FOR LOADING MACHINE

Load on a firm and level ground.
Maintain a safe distance from the road shoulder
1. Apply the brake of the trailer securely.
2. Set chocks (1) to the wheels to secure the trailer.
3. Set right and left ramps (2) parallel to each other and
equally spaced to the right and left of center (3) of the trail-
er. Make angle of installation (4) a maximum of 15 °.
If the ramps bend a large amount under the weight of the
machine, put blocks under the ramps to prevent them from
bending.

4. Push travel speed selector switch (5) to set the travel

speed to low (Lo lights up).
The travel speed (Lo, Mi, Hi) is displayed on travel speed
display (6).
5. Turn auto-deceleration switch (7) OFF and operate the fuel
control dial to set the engine to low speed.
Each time auto-deceleration switch (7) is pressed, it
switches OFF to ON to OFF in turn.
When auto-deceleration switch (7) is turned OFF, the auto-
deceleration pilot lamp (8) goes out.

6. Turn the swing lock switch ON to apply the swing lock.

When the swing lock switch is turned to ON position, swing
lock pilot lamp (9) lights up.
(a): ON position
(b): OFF position

3-252
OPERATION TRANSPORTATION

7. If the machine is equipped with work equipment, set the

work equipment at the front, and travel forward to load it; if
it has no work equipment, travel in reverse to load it.
Follow instructions and signals of a conductor particularly
when traveling in reverse.
8. Before moving the machine onto the ramps, make sure
that the machine is positioned in a straight line with the
ramps and that the centerline of the machine matches that
of the trailer.
9. Set the travel direction toward the ramps and drive slowly.
Lower the work equipment as far as possible without caus-
ing interference.
On the ramps, operate only the travel lever. Do not operate
any other lever.

10. When loading a machine with the work equipment instal-

led, at the point where the tracks are on both the ramps
and the ground surface, turn the swing lock switch OFF,
then swing the upper structure slowly 180 °.

11. Turn the swing lock switch ON to apply the swing lock.
When the swing lock switch is turned to ON position, swing
lock pilot lamp (9) lights up.
(a): ON position
(b): OFF position

12. Drive the machine slowly in reverse to load it onto the trailer.
When the machine travels over the rear wheels of the trailer, it becomes unstable. Drive the machine care-
fully and slowly. (Never operate the steering.)

3-253
TRANSPORTATION OPERATION

When the machine passes over the rear wheels, it inclines

backward. Carefully travel in reverse to the specified point,
and then stop.

METHOD FOR SECURING MACHINE

NOTICE
Stow the radio antenna. Retract the mirrors so that they are within the width of the machine.
For stowing radio antenna, see “STOW ANTENNA (3-249)”.
To prevent damage to the bucket cylinder during transportation, put a block under the tip of the bucket
link to prevent the bucket cylinder from touching the floor.
After loading the machine onto a trailer, secure the machine as follows.
1. Extend the bucket and arm cylinders fully, then lower the
boom slowly.

2. Set the lock lever securely to LOCK position (L).

3. Stop the engine, then remove the key from the starting
switch.
4. Close all of the doors, windows, and covers.
5. Lock the lockable doors, covers, and caps.

Select the way of secure the machine according to the transportation form of each territory.

3-254
OPERATION TRANSPORTATION

METHOD FOR SECURING MACHINE WITH TIE-DOWN POINT

Tie one end of each chain or wire rope of appropriate strength
to the tie-down holes (1) on the track frame.
X: 50 to 100 mm {2.0 to 3.9 in} 
(Keep the chains off the track frame.)

METHOD FOR SECURING MACHINE WITHOUT TIE-DOWN POINT

Place blocks under both ends of the tracks to prevent the ma-
chine from moving during transportation, and secure the ma-
chine with chains or wire ropes of appropriate strength. In par-
ticular, fix the machine securely to prevent it from slipping side-
ways.

3-255
TRANSPORTATION OPERATION

METHOD FOR REMOVING AND INSTALLING MIRROR

If they are to be removed for shipment, or are to be installed again, perform the following procedure.
After installation of mirror, always adjust it. For details, see
“METHOD FOR ADJUSTING MIRRORS (3-169)”.

METHOD FOR REMOVING MIRROR

Mirrors (A), (B)
1. Loosen mounting bolt (2), then remove mirror (1) from sup-
port (3).
2. Loosen bolt (4) and remove support (3) and clamp (5) from
the handrail.

Mirror (C)
Loosen mounting bolt (2), then remove mirror (1) from support
(3).

3-256
OPERATION TRANSPORTATION

METHOD FOR INSTALLING MIRROR

Mirrors (A), (B)
1. Install support (3) and clamp (5) to the handrail, then tight-
en them with bolt (4).
2. Install mirror (1) to support (3),then tighten it with lock bolt
(2).

Mirror (C)
Install mirror (1) to support (3), then tighten it with lock bolt (2).

3-257
TRANSPORTATION OPERATION

METHOD FOR REMOVING AND INSTALLING HANDRAIL

k WARNING
• After the machine is transported, be sure to install the handrails before inspection and mainte-
nance.
• Use the crane, etc. for carrying the handrails.
There is a danger of rolling over or falling from high place that can lead to serious personal injury or
death. Check the scaffolding and ensure your safety before starting the work.
• If installation or removal work of the handrail is improper, there is a hazard that someone may fall
from the machine during the installation or removal work.
Follow the procedure below during the installation or removal work.

METHOD FOR REMOVING HANDRAIL

When performing the removal, remove handrail (A) first.

1. Remove bolts (1), then remove handrail (A) and cover (2).

3-258
OPERATION TRANSPORTATION

2. Remove bolts (3), then remove handrail (B), cover (4), and
plate (5).

METHOD FOR INSTALLING HANDRAIL

When performing the installation, install handrail (B) first.
1. Install handrail (B), cover (4) and plate (5), then tighten them with bolts (3).
2. Install handrail (A) and cover (2), then tighten them with bolts (1).
Tightening torque: 98 to 123 Nm {10.0 to 12.5 kgm,72.3 to 90.4 lbft}

3-259
TRANSPORTATION OPERATION

METHOD FOR REMOVING AND INSTALLING CLIMBING HANDLE

When removing and installing handle (A) for transportation of
the machine, etc., perform the operation according to the fol-
lowing procedure.

METHOD FOR REMOVING CLIMBING HANDLE

Remove bolt (1) and remove handle (A).

METHOD FOR INSTALLING CLIMBING HANDLE

Install handle (A) and tighten it with bolts (1).

3-260
OPERATION TRANSPORTATION

PROCEDURES FOR UNLOADING MACHINE

Perform unloading of the machine on a firm, level ground.
Maintain a safe distance from the road shoulder
1. Apply the brake of the trailer securely.
2. Set chocks (1) to the wheels to secure the trailer.
3. Set right and left ramps (2) parallel to each other and
equally spaced to the right and left of center (3) of the trail-
er. Make angle of installation (4) a maximum of 15 °.
If the ramps bend a large amount under the weight of the
machine, put blocks under the ramps to prevent them from
bending.
4. Remove the chains and wire ropes fastening the machine.
5. Start the engine.
Warm the engine up fully in cold weather.
6. Set the lock lever to FREE position (F).
7. Push travel speed selector switch (5) to set the travel
speed to low (Lo lights up).
The travel speed (Lo, Mi, Hi) is displayed on travel speed
display (6).

8. Turn auto-deceleration switch (7) OFF and operate the fuel

control dial to set the engine to low speed.
Each time auto-deceleration switch (7) is pressed, it
switches OFF to ON to OFF in turn.

When auto-deceleration switch (7) is turned OFF, the auto-

deceleration pilot lamp (8) goes out.

3-261
TRANSPORTATION OPERATION

9. Raise the work equipment and move slowly.

10. When the machine is horizontal on the top of the rear end
of the trailer, stop the machine.

11. Set the angle between the arm and boom to 90 to 100 °.
NOTICE
When unloading the machine, always set the angle be-
tween the arm and boom to 90 to 100 °.
If the machine is unloaded while the arm is curled, it
will cause damage to the machine.

12. Lower the bucket to the ground.

NOTICE
Do not hit the bucket against the ground to prevent
damage to the hydraulic cylinders.
13. With the bucket lowered to the ground, move to the ramps
slowly from the rear end of the trailer.
14. Operate the boom and arm slowly to lower the machine
carefully until it is completely off the ramps.

METHOD FOR LIFTING MACHINE

k WARNING
• The person using the crane to perform lifting operations must be a qualified crane operator.
• Never perform lifting operation if any person is on the machine being lifted.
• Always use a wire rope that has ample strength for the weight of the machine being lifted.
• When lifting, keep the machine horizontal.
• When performing lifting operations, set the lock lever to LOCK position to prevent the machine from
moving unexpectedly.
• Never enter the area under or around a lifted machine.
Never try to lift the machine in any other posture nor using other lifting equipment than those given in
the following procedures.
There is a danger that the machine loses its balance.

NOTICE
This method of lifting applies to the standard specification machine.
The method of lifting differs depending on the attachments and options installed.
For details of the procedure for machines other than of the standard specification, consult your Komat-
su distributor.
For the weight, see “SPECIFICATIONS (5-2)”.

3-262
OPERATION TRANSPORTATION

When lifting the machine, perform the operation on flat ground as follows.
1. Start the engine.
2. Swing the upper structure so that the work equipment is on
the sprocket (1) side.
3. Extend the bucket cylinder and arm cylinder fully, then low-
er the work equipment to the ground using the boom cylin-
der as shown in the figure.

4. Set the lock lever securely to LOCK position (L).

5. Stop the engine.
6. Check that there is nothing around the operator's seat, and
then get off the machine.
Close the cab door and front window securely.

7. Pass wire ropes between the 1st and 2nd track rollers from
the front and between the 1st and 2nd track rollers from
the rear.
However, for machines equipped with full roller guards for
the track rollers, pass the wire ropes under the tracks.
When the wire rope contacts with the edge of the machine,
put wooden block or backing metal between them.
8. Set the lifting angle (A) of the wire rope to 30 to 40 °, then
sling the machine slowly.
9. After the machine comes off the ground, check the hook
condition and the lifting posture, and then sling the ma-
chine upward slowly.

3-263
TRANSPORTATION OPERATION

SPREAD AND NARROW TRACK FRAME GAUGE

PRECAUTIONS FOR SPREADING AND NARROWING TRACK FRAME GAUGE
k WARNING
• Never use the machine for operations with the track frame gauge narrowed.
• Never operate the cylinders suddenly when adjusting the track frame gauge, since doing so is dan-
gerous.
• Adjust the track frame gauge on a level hard ground.
• While the track frame gauge is narrowed, do not perform travel operation other than unloading from
a trailer.

NARROW TRACK FRAME GAUGE

Narrow the track frame gauge according to the following procedure.
1. Remove center frame mounting bolts (1) (9 pieces each on
the front and rear side) on one side.

2. Swing the upper structure to a right angle to track frame

(2) to be moved in.
3. Connect track frames (2) and (3) on right and left sides
with chain block (4).
4. Raise the track frame off the ground by using the work
equipment.
REMARK
Raising height (H) of the track frame must be 50 mm {2 in} 
or lower. If the track frame is raised too high, the stopper
bolt will be pried and bent.
5. Pull track frame (2) with chain block (4) and spread the gauge.
6. Lower the machine body softly on the ground.
7. Install bolts (1) (4 pieces on front and rear side) which has
been removed.
Tightening torque: 1520 to 1910 Nm {155 to 195 kgm,
1120 to 1410 lbft}

Work on the track frame on the other side in the same way.

SPREAD TRACK FRAME GAUGE

Spread the track frame gauge according to the following procedure.

3-264
OPERATION TRANSPORTATION

1. Remove front and rear center frame mounting bolts (1) (4

pieces each on the front and rear sides) on the side to be
moved out.

2. Swing the upper structure to a right angle to track frame

(2) to be moved out.
3. Connect bucket (3) and track frame (2) to be moved out by
chain block (4).
4. Raise track frame (2) to be moved out by using the work
equipment.
REMARK
Raising height (H) of the track frame must be 50 mm {2 in} 
or lower. If the track frame is raised too high, the stopper
bolt will be pried and bent.
5. Pull track frame (2) with chain block (4) and spread the gauge.
6. Pull the track frame until it reaches the stopper, and then lower the machine to the ground.
7. Install removed bolts (1) (9 pieces each on the front and
rear sides).
Tightening torque: 1520 to 1910 Nm {155 to 195 kgm,
1120 to 1410 lbft}

Work on the track frame on the other side in the same way.

3-265
COLD WEATHER OPERATION OPERATION

COLD WEATHER OPERATION

COLD WEATHER OPERATION INFORMATION
If the ambient temperature becomes low, it becomes difficult to start the engine, and the coolant may freeze.
Follow the instructions described as follows.

FUEL AND LUBRICANTS

Change fuel and oil with ones of low viscosity for all components.
For the details of specified viscosity, see “RECOMMENDED FUEL, COOLANT, AND LUBRICANT (7-5)”.

COOLANT
k WARNING
• Coolant is toxic. Be careful not to get it into your eyes or on your skin. If it should get into your eyes
or on your skin, wash it off with large amount of fresh water and see a doctor immediately.
• When handling the cooling water containing coolant that has been drained during changing the
coolant or repair of radiator, contact your Komatsu distributor or request a qualified company to
perform the operation. Coolant is toxic, so never pour it into drainage ditches or drain it onto the
ground surface.

NOTICE
Komatsu recommends the use of Non-Amine Engine Coolant (AF-NAC) for the coolant.
Non-Amine Engine Coolant (AF-NAC) is already diluted with distilled water, so it is not flammable.
For details on the coolant change interval and the density of Non-Amine Engine Coolant (AF-NAC), see “METH-
OD FOR CLEANING INSIDE OF COOLING SYSTEM (4-21)”.

DEF
NOTICE
• DEF freezes at –11 °C {12 °F} .
If DEF in DEF tank freezes, it may expand to break the devices in the tank. The parts inside the tank
may be affected. Add DEF to the specified amount for cold weather (below the level of when DEF
may freeze).
For the specified amount of DEF, see “METHOD FOR CHECKING DEF LEVEL, ADDING DEF (3-160)”.
• If DEF or the machine equipped with DEF system cannot be stored at the outside temperature is
lower than –11 °C {12 °F} , DEF in the tank may freeze. Ask your Komatsu distributor for discharging
of DEF, and keep it in the condition free from freezing.

3-266
OPERATION COLD WEATHER OPERATION

BATTERY
k WARNING
• Do not bring any open flame near the battery. Otherwise, it may explode since the battery generates
the flammable gas.
• Battery electrolyte is dangerous object. If it gets in your eyes or on your skin, wash it off with a
large amount of water and consult a doctor.
• Battery electrolyte dissolves paint. If it gets on the bodywork, wash it off immediately with water.
• Do not charge the battery or start the engine with a different power source if the battery electrolyte
is frozen. Battery may explode.
• Battery electrolyte is toxic. Do not let it flow into drainage ditches or spray it on to the ground sur-
face.

When the ambient temperature drops, the capacity of the battery will also drop. Maintain the battery charging
rate as close as possible to 100 %. Insulate it against cold temperature to ensure that the machine can be start-
ed easily in the next morning.
REMARK
Measure the gravity of the electrolyte and calculate the charging rate from the following conversion table.
Electrolyte Temper-
20 °C 0 °C –10 °C –20 °C
ature
{68 °F} {32 °F} {14 °F} {-4 °F}
Charging Rate ( %)
100 1.28 1.29 1.30 1.31
90 1.26 1.27 1.28 1.29
80 1.24 1.25 1.26 1.27
75 1.23 1.24 1.25 1.26

• When the ambient temperature is low, the capacity of the battery considerably drops. Cover it, or remove it
from the machine to place it in the warm place. Restore it again before the operation.
• If the electrolyte level is low, add distilled water in the morning before beginning the work. Do not add water
after the day's work to prevent diluted electrolyte in the battery from freezing during the night.

3-267
COLD WEATHER OPERATION OPERATION

PRECAUTIONS AFTER DAILY WORK COMPLETION

k WARNING
Performing idling of the tracks is dangerous, stay well away from the tracks.

To prevent mud, water, or the undercarriage from freezing and making it impossible for the machine to move on
the following morning, observe the following precautions.
• Remove all the mud and water from the machine body. In particular, wipe the hydraulic cylinder rods clean
to prevent damage to the seal caused by mud, dirt, or drops of water on the rod from getting inside the seal.
• Place the machine on a firm, dry ground.
If this is impossible, park the machine on boards.
The boards prevent the tracks from freezing to the ground, and allow the machine to move the next morn-
ing.
• Open the drain valve and drain any water collected in the fuel system to prevent it from freezing.
• Fill up the fuel tank. This minimizes moisture condensation in the tank when the temperature drops.
• In cold weather condition, add DEF to the defined level strictly. If adding more than the defined level, it may
expand to break the devices in the tank when it freeze.
If DEF tank level is lower than the defined level for the cold weather, DEF may freeze easily to damage the
parts in DEF system. If the filler cap freeze, de freeze and open.
• After operation in water or mud, remove water from undercarriage as described below to extend undercar-
riage service life.
Swing 90 ° with engine at low idle and bring the work equip-
ment to the side of the track.
Slowly push up the machine until the track is raised slightly
from the ground. Perform idle rotation of track. Perform this
procedure on the right and left sides alternately.

AFTER COLD WEATHER SEASON

When the season changes and the weather becomes warmer, do as follows.
Replace the fuel and oil for all equipment with the ones of the specified viscosity. For details, see “RECOM-
MENDED FUEL, COOLANT, AND LUBRICANT (7-5)”.
If the machine is parked for long time in the cold weather condition, quality of DEF may be affected by repeated
freeze, ask your Komatsu distributor to inspect.

3-268
OPERATION PRECAUTIONS FOR LONG-TERM STORAGE

PRECAUTIONS FOR LONG-TERM STORAGE

PREPARATION FOR LONG-TERM STORAGE
NOTICE
When storing the machine (1 month or more), set the ma-
chine in the posture shown in the figure to protect the cyl-
inder rods.
(To prevent the cylinder piston rods from rusting)

When putting the machine in storage for a long time (more than 1 month), do as follows.
• Clean and wash all parts of the machine and store it indoors. If the machine has to be stored outdoors,
select a level ground and cover the machine with waterproof sheet.
• Fill up the fuel tank. This prevents dew condensation.
• Fill up DEF tank (Except cold weather condition). If the inside dries up, urea is deposited and it may cause
failures in component operation.
• Grease the machine and change the oil before storage.
• Coat the exposed portion of the hydraulic cylinder piston rod with grease.
• Turn the starting switch to OFF position and turn the battery disconnect switch key to OFF position, and
remove it. When storing the battery, cover it.
For the operation of the battery disconnect switch, see “BATTERY DISCONNECT SWITCH (3-120)”.
• Set the attachment control pedal to the lock position on the machines ready for attachments.
• If the machine is ready for installation of attachment, set the stop valve to the LOCK position. Install the
blind plugs to the elbows.
For explanation of LOCK and FREE states of the stop valve, see “METHOD FOR REMOVING AND IN-
STALLING ATTACHMENT (6-11)”.
• To prevent rust, fill the cooling circuit with Non-Amine Engine Coolant (AF-NAC) to give a density of at least
30% for the engine coolant.

MAINTENANCE DURING LONG-TERM STORAGE

k WARNING
If it is necessary to perform the rust-prevention operation while the machine is indoors, open the doors
and windows to improve ventilation and prevent gas poisoning.

• During storage, operate and move the machine for a short distance once a month so that a new film of oil
will coat moving parts. At the same time, charge the battery as well.
• When operating the work equipment, wipe off all the grease from the hydraulic cylinder rods.
• If the machine is equipped with an air conditioner, operate the air conditioner for 3 to 5 minutes once a
month to lubricate all parts of the air conditioner compressor. Always run the engine at low idle when doing
this. In addition, check the refrigerant level twice a year.

3-269
PRECAUTIONS FOR LONG-TERM STORAGE OPERATION

STARTING MACHINE AFTER LONG-TERM STORAGE

NOTICE
If the machine has been stored without performing the monthly rust-prevention operation, consult your
Komatsu distributor before using it.
When using the machine after long-term storage, perform the following items before using it.
• Wipe off the grease from the hydraulic cylinder rods.
• Add oil and grease at all lubrication points.
• When the machine is stored for a long period, moisture in the air will mix with the oil. Check the oil before
and after starting the engine. If there is water in the oil, change all the oil.
• Insert the battery disconnect switch key and turn it to ON position.
For the operation method, see “BATTERY DISCONNECT SWITCH (3-120)”.
• If the machine is stored for a long period with the battery disconnect switch OFF or the battery terminal dis-
connected, the clock information and radio tuning information may be lost. In this case, set again. For de-
tail, see “CLOCK ADJUSTMENT (3-86)” and “HANDLING RADIO (3-244)”.
• When starting the engine, warm it up sufficiently according to the procedure in “METHOD FOR ENGINE
WARM-UP OPERATION (3-188)”.
If the machine has been stored for more than 2 months, perform the following procedure.
• Before starting the engine, replace DEF filter and fill up DEF tank according to the procedure in “METHOD
FOR REPLACING DEF FILTER (4-82)”.
• Start the engine and check correctly.
If SCR system has any abnormality, warning is displayed on the monitor screen and the audible alert
sounds. If SCR system has any abnormality, stop the engine, and then start it again.
If SCR system still has abnormality after the engine is restarted, contact your Komatsu distributor.
• If DEF is kept in DEF tank for more than 1 year, ask your Komatsu distributor for replacement.
Dispose of drained DEF according to the local regulations and rules.
Aged DEF may have smell of ammonia. Replace DEF in a well-ventilated place and take care not to inhale
its vapor.

3-270
OPERATION TROUBLES AND ACTIONS

TROUBLES AND ACTIONS

ACTIONS WHEN RUNNING OUT OF FUEL
When starting the engine again after running out of fuel, fill it up with fuel and bleed air from the fuel system
before stating.
Always check the fuel level to prevent running out of fuel.
If the engine has stopped because of running out of fuel, all the air in the fuel circuit must be bled by using the
fuel feed pump.

PROCEDURES FOR BLEEDING AIR FROM FUEL CIRCUIT

k WARNING
When using the fuel feed pump, do not loosen the air bleeding plug of the fuel circuit. The fuel circuit is
pressurized while the fuel feed pump is operated. If the air bleeding plug is loosened at this time, fuel
may spout out and it is dangerous.

Bleed air according to the following procedure.

1. Turn the starting switch key to OFF position (A) to stop the
engine.

2. Tilt switch for the fuel feed pump (1) to ON position.

Lamp (2) flashes and the electric fuel feed pump operates.
Check that lamp (2) is not lit.
After the specified time (approximately 7 minutes), lamp
(2) goes out automatically and the fuel feed pump stops.

When the lamp goes out, air bleeding is completed.

REMARK
If the engine stopped because of running out of fuel or if the supply pump is replaced after servicing of
the fuel hoses and tubes, the fuel circuit is empty. In such a case, set fuel feed pump switch (1) to ON
position again after the fuel feed pump stops (the lamp goes out) automatically.
3. Start the engine.
If the engine does not start, all air may not be bled. Start the engine according to the following procedure.
1) Set the fuel feed pump switch (1) to ON position.
2) Start the engine while the fuel feed pump is in operation.
If the engine does not start, repeat steps 1) and 2).
Keep away from the engine while it is being started and running.
3) After the engine starts, run it for approximately 5 minutes to bleed all air from the fuel circuit.

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TROUBLES AND ACTIONS OPERATION

4) After approximately 5 minutes, stop the engine. Then, start the engine as usual.

PHENOMENA THAT ARE NOT FAILURES

Note that the following phenomena are not failures:
• When the arm is operated IN from a high position for dig-
ging under no load, the arm speed drops momentarily at
the vertical position.

• When performing bucket CURL operation from a high posi-

tion for digging under no load, the bucket speed drops mo-
mentarily at the horizontal position.
• The bucket or arm wobbles by itself during heavy-duty dig-
ging operations.

• When starting or stopping the swing, a noise is generated from the brake valve.
• When going down a steep slope at low speed, a noise is generated from the travel motor brake valve.

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OPERATION TROUBLES AND ACTIONS

PRECAUTIONS FOR TOWING MACHINE

k WARNING
Always use the correct towing equipment and towing
method. Any mistake in the selection of the wire rope or
drawbar or the method of towing a disabled machine and
being towed may lead to serious personal injury or death.
• Always confirm that the wire rope or drawbar used for
towing has ample strength for the weight of the ma-
chine being towed.
• A wire rope having cut strands (A), reduced diameter
(B), or kinks (C) may break. Never use such a wire
rope.
• Always wear leather gloves when handling the wire
rope.
• Never tow a machine on a slope.
• During the towing operation, never stand between the
towing machine and the machine being towed.
• Operate the machine slowly and be careful not to ap-
ply any sudden load to the wire rope.
• Do not use the holes for towing light objects or tie-
down holes when towing the machine.

NOTICE
The maximum towing capacity for this machine is 303030 N {30900 kg} .
Do not tow any load greater than this.
• If the machine sinks in mud and cannot get out under its
own power, or if the machine tows a heavy object, use a
wire rope as shown in the figure on the right.
• Place pieces of wood between the wire ropes and the ma-
chine to prevent damage to the ropes and the machine.
• Hold the wire rope level and set it straight to the track
frame.
• When towing a machine, travel at a speed of less than 1
km/h for a distance of only a few meters to a place that is
suitable for performing repairs.
Perform this only in an emergency.

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TROUBLES AND ACTIONS OPERATION

PRECAUTIONS FOR USING LIGHTWEIGHT TOWING HOLE

k WARNING
• Always use the correct towing equipment and towing method. Any mistake in the selection of the
wire rope or drawbar or the method of towing a disabled machine and being towed may lead to seri-
ous personal injury or death. Select the appropriate tools and methods.
• The shackle must always be used.
• Hold the wire rope level and set it straight to the track frame.
• Move the machine slowly and be careful not to apply any sudden load to the wire rope.
• Do not use the tie-down holes for towing the machine.

There is a hole in the track frame to fit the shackle when towing
light objects.
Permissible towing load: Max. 154000 N {16000 kg} 

PRECAUTIONS FOR SEVERE JOB CONDITION

• When performing digging operations in water, if the work equipment mounting pin goes into the water, per-
form greasing every time the operation is performed.
• For heavy-duty operations and deep digging, perform greasing of the work equipment mounting pins every
time before operation.
After greasing, operate the boom, arm and bucket several times, then grease again.

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OPERATION TROUBLES AND ACTIONS

PRECAUTIONS FOR DISCHARGED BATTERY

k WARNING
• It is dangerous to charge a battery when installed on a
machine. Make sure that it is removed before charg-
ing.
• When checking or handling the battery, stop the en-
gine and turn the starting switch and battery discon-
nect switch keys to OFF positions.
• The battery generates hydrogen gas, and it is danger-
ous that it may explode. Do not bring open flame such
as lighted cigarettes near the battery, or do nothing
that will cause sparks.
• Battery electrolyte is dilute sulfuric acid, and it will at-
tack your clothes and skin. If it gets on your clothes or
on your skin, immediately wash it off with a large
amount of clean water.
If it gets in your eyes, wash the eyes immediately with
clean water, then consult a doctor for medical treat-
ment.
• When handling batteries, always wear protective eye-
glasses and rubber gloves.
• When removing the battery, first disconnect the cable
from the ground (normally the negative (-) terminal).
When installing, first connect the cable to the positive
(+) terminal.
If a tool touches the positive terminal and the chassis,
it is dangerous that it may cause a spark. Be extremely
careful.
• If the terminals are loose, it is dangerous that the de-
fective contact may generate sparks, and it may cause
an explosion.
Install the cable terminals securely.
• When removing or installing the cable terminals,
check which is the positive (+) terminal and which is
the negative (-) terminal.

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TROUBLES AND ACTIONS OPERATION

METHOD FOR REMOVING AND INSTALLING BATTERY

k CAUTION
• Before removing the battery, remove the ground cable (normally connected to the negative (-) termi-
nal).
If any tool touches between the positive (+) terminal and the chassis, there is a hazard of sparks
being generated.
• When installing the battery, connect the ground cable last.

• Tightening torque of battery terminal fixing nut (A): 9.8 to

11.8 Nm {1.0 to 1.2 kgm,7.2 to 8.7 lbft}
• When replacing the battery, secure it with the battery hold-
down fittings.
Tightening torque of mounting bolt (B): 9.8 to 19.6 Nm {1.0
to 2.0 kgm,7.2 to 14.5 lbft}

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OPERATION TROUBLES AND ACTIONS

PRECAUTIONS FOR CHARGING BATTERY

k WARNING
When charging the battery, if the battery is not handled
correctly, it is dangerous that the battery may explode. Al-
ways follow the instructions in “PRECAUTIONS FOR DIS-
CHARGED BATTERY (3-275)” and the instruction manual
accompanying the charger, and observe the following.
• Set the voltage of the charger to match the voltage of
the battery to be charged. If the correct voltage is not
,&
selected, the charger may overheat and cause an ex-
plosion.
• Connect the positive (+) charger clip of the charger to
the positive (+) terminal of the battery, then connect
the negative (-) charger clip of the charger to the nega-
tive (-) terminal of the battery. Be sure to attach the
clips securely.
• Set the charging current to 1/10 of the value of the rat-
ed battery capacity; when performing rapid charging,
set it to less than the rated battery capacity.
If the charger current is too high, the electrolyte will
leak or the battery cells will dry up, and this may cause
the battery to catch fire and explode.
• If the battery electrolyte is frozen, do not charge the
battery or start the engine with a different power
source. It is dangerous that this may ignite the battery
electrolyte and cause the battery to explode.
• Do not use or charge the battery if the battery electro-
lyte level is below LOWER LEVEL line. This may cause
an explosion. Check the battery electrolyte level peri-
odically and add distilled water to bring the electrolyte
level to UPPER LEVEL line.

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TROUBLES AND ACTIONS OPERATION

START ENGINE WITH JUMPER CABLES

k WARNING
• When connecting the cables, never contact the posi-
tive (+) and negative (-) terminals.
• Always wear protective eyeglasses and rubber gloves
when starting the engine by using the jumper cable.
• Be careful not to let the normal machine and failed ma-
chine contact each other.
The sparks caused near the battery could ignite the
hydrogen gas generated from the battery, so be care-
ful not to let it happen.
• Make sure that there is no mistake in the jumper cable
connections. In the last connection (to the upper
structure frame), a spark will be caused, connect the
cable to a spot as far away from the battery as possi-
ble. (However, do not connect to the work equipment
since the current does not flow well through it.)
• When disconnecting the jumper cable, take care not to
bring the clips in contact with each other or with the
machine.

NOTICE
• The starting system for this machine uses 24 V. Accordingly, the normal machine must be equipped
with a 24 V battery.
• The sizes of the jumper cables and clips should be suitable for the battery size.
• The battery of the normal machine must be the same capacity as that of the failed machine.
• Check the cables and clips for damage or corrosion.
• Make sure that the cables and clips are firmly connected.
• Check that the lock levers and parking brake levers (if equipped) of both machine are in LOCK posi-
tion.
• Check that each lever is in NEUTRAL position.
• To prevent damage of the electric devices of the failed machine, turn the starting switch of the failed
machine to OFF position, and then turn the battery disconnect switch key to OFF position before
connecting the jumper cables. For the operating method of the battery disconnect switch, see “BAT-
TERY DISCONNECT SWITCH (3-120)”.
REMARK
If the battery disconnect switch is turned to OFF position, the radio tuning information etc. may be lost. In this
case, set the information again. For detail, see “HANDLING RADIO (3-244)”.

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OPERATION TROUBLES AND ACTIONS

PROCEDURE FOR CONNECTING JUMPER CABLE

Turn the starting switch and battery disconnect switch of the failed machine, and the starting switch of the nor-
mal machine to OFF position.
1. Connect the clip of jumper cable (A) to the positive (+) ter-
minal of battery (C) on the failed machine.
2. Connect the clip at the other end of jumper cable (A) to the
positive (+) terminal of battery (D) on the normal machine.
3. Connect the clip of jumper cable (B) to the negative (-) ter-
minal of battery (D) on the normal machine.
4. Turn the battery disconnect switch (S) of the failed ma-
chine to ON position.
5. Connect the other clip of jumper cable (B) to the revolving
frame (E) of the failed machine.

METHOD FOR STARTING ENGINE

1. Check both of normal machine and failed machine that the lock lever is set to LOCK position.
Check also that all the control levers are in NEUTRAL position.
2. Make sure the clips are firmly connected to the battery terminals.
3. Start the engine of the normal machine and run it at high idle (max. speed).
4. Turn the starting switch of the failed machine to START position and start the engine.
If the engine does not start, try again after at least 2 minutes.

PROCEDURE FOR REMOVING JUMPER CABLE

After the engine has started, disconnect the jumper cables in the reverse of the order in which they were con-
nected.
1. Remove the clip of jumper cable (B) from the revolving
frame (E) of the failed machine.
2. Remove the clip of jumper cable (B) from the negative (-)
terminal of battery (D) on the normal machine.
3. Remove the clip of jumper cable (A) from the positive (+)
terminal of battery (D) on the normal machine.
4. Remove the clip of jumper cable (A) from the positive (+)
terminal of battery (C) on the failed machine.

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TROUBLES AND ACTIONS OPERATION

OTHER TROUBLE
PHENOMENA AND ACTIONS FOR ELECTRICAL SYSTEM
• For the remedies indicated with (*) in the remedy column, always contact your Komatsu distributor.
• In cases of problems or causes which are not listed below, ask your Komatsu distributor for repairs.
Problem Main causes Remedy
Defective wiring, deterioration of bat- Check and repair loose terminal or
Lamp does not glow brightly even tery wire breakage, replace battery. (*)
when the engine runs at high
speeds. Loosening and damage of alternator Check alternator belt tension and re-
belt place. (*)
Defective wiring, deterioration of bat- Check and repair loose terminal or
Lamp flickers while engine is run- tery wire breakage, replace battery. (*)
ning. Loosening and damage of alternator Check alternator belt tension and re-
belt place. (*)

Charge level caution lamp does not Defective alternator Replace. (*)
go out even when engine is running. Defective wiring Check, repair. (*)
Unusual noise is generated from al- Defective alternator Replace. (*)
ternator.
Starting motor does not rotate even Defective wiring Check, repair. (*)
when starting switch is turned to
Defective starting motor Replace. (*)
START position.
Insufficient battery charge Charge battery.
Battery disconnect switch at OFF po- Turn ON.
sition
Engine shutdown secondary switch Set it to “NORMAL” position.
at “STOP ENGINE” position Apply the cover.
Pinion of starting motor repeats en- Insufficient battery charge Charge battery.
gaging and disengaging (rattles).
Defective safety relay Replace. (*)
Starting motor turns engine sluggish- Insufficient battery charge Charge battery.
ly.
Defective starting motor Replace. (*)
Starting motor disengages before Defective wiring, defective ring gear Check, repair. (*)
engine starts. and pinion
Insufficient battery charge Charge battery.
Preheating pilot lamp does not light Defective wiring Check, repair. (*)
up.
Defective heater relay Replace. (*)
Defective monitor Replace. (*)
Oil pressure caution lamp does not Defective monitor Replace. (*)
light up when engine is stopped
Defective caution lamp switch Replace. (*)
(starting switch is at ON position).
When startability at low temperature Defective wiring Check, repair. (*)
is poor, if you touch the outside of
Wire breakage in electrical intake air Replace. (*)
the electric heater by hand after pre-
heater
heating, it is not felt warm.
Defective operation of heater relay Replace. (*)
Blown fuse of the heater Replace. (*)

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OPERATION TROUBLES AND ACTIONS

Problem Main causes Remedy

Engine does not start. Damaged data in the controller Check, repair. (*)
(“L04” lights up on monitor.) Other system troubles Check, repair. (*)

PHENOMENA AND ACTIONS FOR CHASSIS

• For the remedies indicated with (*) in the remedy column, always contact your Komatsu distributor.
• In cases of problems or causes which are not listed below, ask your Komatsu distributor for repairs.
Problem Main causes Remedy
Speed of travel, swing, boom, arm, Lack of hydraulic oil Set oil to specified level. See
bucket is slow CHECKS BEFORE STARTING.
Pump generates abnormal noise. Clogged element in hydraulic tank Clean. See EVERY 2000 HOURS
(sucking in air) strainer, lack of oil MAINTENANCE.

Excessive rise in hydraulic oil temper- Dirty oil cooler Clean. See EVERY 500 HOURS
ature MAINTENANCE.
Lack of hydraulic oil Set oil to specified level. See
CHECKS BEFORE STARTING.
Adjust track tension, see WHEN RE-
Track comes off. Track too loose
QUIRED.
Adjust track tension, see WHEN RE-
Abnormal wear of sprocket Track too loose
QUIRED.
Boom rises slowly or does not rise. Lack of hydraulic oil Set oil to specified level. See
CHECKS BEFORE STARTING.
Does not swing. Swing lock switch still applied Turn swing lock switch OFF.
Swing brake system error Check, adjust. (*)
When move of machine to safe place
is required, turn the swing parking
brake cancel switch to ON position
temporarily.

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TROUBLES AND ACTIONS OPERATION

PHENOMENA AND ACTIONS FOR ENGINE RELATED PARTS

• For the remedies indicated with (*) in the remedy column, always contact your Komatsu distributor.
• In cases of problems or causes which are not listed below, ask your Komatsu distributor for repairs.
Problem Main causes Remedy
Engine oil pressure caution lamp Lowered oil level in engine oil pan Set oil to specified level. See
lights up. (sucking in air) CHECKS BEFORE STARTING.
Improper oil is used. (Viscosity is im- Replace oil. See METHOD FOR US-
proper.) ING FUEL, COOLANT AND LUBRI-
CANTS ACCORDING TO AMBIENT
TEMPERATURE.
Clogged oil filter cartridge Replace cartridge. See EVERY 500
HOURS MAINTENANCE.
Oil leakage due to improper connec- Check, repair. (*)
tion or breakage of oil pipe or pipe
joint
Defective engine oil pressure sensor Replace sensor. (*)
Defective monitor Replace monitor. (*)
Steam spurts out from top of radiator Lowered coolant level, leakage of Check, add coolant, repair. See
(pressure valve). coolant CHECKS BEFORE STARTING.
Dirt or scale accumulated in cooling Change coolant, flush inside of cool-
system ing system. See WHEN REQUIRED.
Clogged radiator fins or damaged fin Clean or repair. See EVERY 500
HOURS MAINTENANCE.
Defective thermostat Replace thermostat. (*)
Loosened radiator filler cap (in high Tighten cap or replace packing.
altitude operation)
Defective coolant level sensor Replace sensor.
Defective monitor Replace monitor.
Radiator coolant level caution lamp Lowered coolant level, leakage of Check, add coolant, repair. See
lights up. coolant CHECKS BEFORE STARTING.
Dirt or scale accumulated in cooling Change coolant, flush inside of cool-
system ing system. See WHEN REQUIRED.
Clogged radiator fins or damaged fin Clean or repair. See EVERY 500
HOURS MAINTENANCE.
Defective thermostat Replace thermostat. (*)
Loosened radiator filler cap (in high Tighten cap or replace packing.
altitude operation)
Defective coolant level sensor Replace sensor.
Defective monitor Replace monitor.

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OPERATION TROUBLES AND ACTIONS

Problem Main causes Remedy

Starting motor turns but engine does Add fuel. See CHECKS BEFORE
Lack of fuel
not start. STARTING.
Repair place where air is sucked in.
Air in fuel system See EVERY 500 HOURS MAINTE-
NANCE.
Defective fuel injection pump or de- Replace pump or nozzle. (*)
fective nozzle
Starting motor turns engine sluggish- See ELECTRICAL SYSTEM.
ly.
Preheating caution lamp does not See ELECTRICAL SYSTEM.
light up.
Defective compression Adjust valve clearance. (*)
(Defective valve clearance)
Exhaust gas color is white or bluish. Water entry in KDPF Check, repair. (*)
Broken KDPF Replace KDPF. (*)
Excessive oil in oil pan Set oil to specified level. See
CHECKS BEFORE STARTING.
Improper fuel Replace with specified fuel.
Exhaust gas turns black from time to Broken KDPF Replace KDPF. (*)
time.
Combustion makes breathing sound
Defective nozzle Replace nozzle. (*)
from time to time.
Abnormal noise is generated. Low grade fuel being used Replace with specified fuel.
(Combustion or mechanical) Overheating Refer to "Radiator coolant level cau-
tion lamp lights up" above.
KDPF broken internally Replace KDPF. (*)
Excessive valve clearance Adjust valve clearance. (*)

3-283
TROUBLES AND ACTIONS OPERATION

IF MACHINE MONITOR SHOWS WARNING DISPLAY

When the action level display (1) or caution lamp (2) is shown
on the display of the machine monitor, press switch F5 to dis-
play the Current Abnormality and check the details and reme-
dy.
For the contents of the action level display and caution lamp,
see “WARNING DISPLAY (3-19)”.

• When “DXA8KA”, “DXA8KB”, “DXA9KA”, or “DXA9KB” is

on the Current Abnormality screen, you can make it possi-
ble to perform operations temporarily by turning the pump
secondary drive switch to upper (emergency) position. For
details of the switch, see “PUMP SECONDARY DRIVE
SWITCH (3-99)”.
After that, immediately ask your Komatsu distributor for in-
spection and repair.
• When the machine has not run out of fuel, if “CA2249” or
“CA559” appears on the Current Abnormality screen, re-
place both fuel main filter and fuel prefilter immediately.
For details of replacement, see “METHOD FOR REPLACING FUEL PREFILTER CARTRIDGE (4-56)” and
“METHOD FOR REPLACING FUEL MAIN FILTER CARTRIDGE (4-68)”.
If “CA2249” or “CA559” does not disappear even after the replacement, ask your Komatsu distributor for
inspection and repair immediately, even though the machine can perform normal operation.
Telephone number for the point of contact if an error occurs
When an error screen is displayed on the monitor, press the
switch F5 to display the Current Abnormality list screen and tel-
ephone number (3) for the point of contact is displayed in the
message column at the bottom of the screen.
REMARK
If no point of contact telephone number is registered, no tele-
phone number is displayed.
Ask your Komatsu distributor for the telephone number regis-
tration if necessary.

3-284
 MAINTENANCE

Please read and make sure that you understand the SAFETY section before
reading this section.

4-1
PRECAUTIONS FOR MAINTENANCE MAINTENANCE

PRECAUTIONS FOR MAINTENANCE

Do not perform any inspection and maintenance operation that are not found in this manual.

CHECK SERVICE METER READING

Check the service meter reading every day to see if the maintenance time has come for any necessary mainte-
nance item to be performed.

KOMATSU GENUINE REPLACEMENT PARTS

Komatsu recommends using Komatsu genuine parts specified in Parts Book as replacement parts.

KOMATSU GENUINE LUBRICANTS

For lubrication of the machine, Komatsu recommends using Komatsu genuine lubricants. Moreover use oil of
the specified viscosity according to the ambient temperature.

ALWAYS USE CLEAN WASHER FLUID

Use automobile window washer fluid, and be careful not to let any dirt get into it.

FRESH AND CLEAN LUBRICANTS

Use clean oil and grease. Also, keep the containers of the oil and grease clean. Keep foreign materials away
from oil and grease.

CHECK DRAINED OIL AND USED FILTER

When replacing filters after oil is changed, check the old oil and filters for metal particles and foreign materials. If
large quantity of metal particles or foreign materials are found, always report to the person in charge, and per-
form suitable action.

PRECAUTIONS FOR REFILLING OIL OR FUEL

If your machine is equipped with a strainer, do not remove it while filling oil or fuel.

PRECAUTIONS FOR ADDING DEF

Do not remove the strainer while adding DEF.

PRECAUTIONS FOR WELDING

• When performing welding, turn the starting switch to OFF position, check that the system operating lamp is
not lit. Turn the battery disconnect switch to OFF position, and remove the key.
• Do not apply a voltage higher than 200 V continuously.
• Connect grounding cable within 1 m (3 ft 3 in) of the area to be welded. If grounding cable is connected
near instruments, connectors, etc., the instruments may malfunction.
• Prevent seals, bearings or bushings from entering the space between the weld zone and grounding point.
Seals and the like can cause damage to the nearby parts by catching fire from sparks.
• Do not use the area around the work equipment pins or the hydraulic cylinders as the grounding point.
Sparks generated there can damage the plated portion.

DO NOT DROP THINGS INSIDE MACHINE

• When opening the inspection windows or the oil filler port of the tank to perform inspection, be careful not to
drop nuts, bolts, or tools inside the machine.
If such things are dropped inside the machine, it may cause damage and/or malfunction of the machine,
and will lead to failure. If anything drops, be sure to take it out.
• Do not put unnecessary things in your pockets. Carry only things which are necessary for inspection.

PRECAUTIONS FOR KDPF

When performing inspection and maintenance during or just after regeneration, take care of the high tempera-
ture parts.
Even after the engine stops the parts around KDPF may be at high temperature.

4-2
MAINTENANCE PRECAUTIONS FOR MAINTENANCE

PRECAUTIONS FOR SCR ASSEMBLY

Be careful for the high temperature parts when performing inspection and maintenance. Even after the engine
stops the parts around SCR device may be at high temperature.

DUSTY JOBSITES
When working at dusty jobsites, observe the following.
• Clean the radiator fins and other parts of the heat exchange equipment more frequently, and take care not
to let the fins become clogged.
• Replace the fuel filter more frequently.
• Clean electrical components, especially the starting motor and alternator, to avoid accumulation of dust.
• When checking and replacing the oil or filters, move the machine to a place where there is no dust and take
care to prevent dust from entering the system.

AVOID MIXING OIL

Never mix different brand or grade of oil. If a different brand or grade of oil has to be added, drain the old oil and
replace all the oil with the new brand or grade of oil.

LOCK INSPECTION COVERS

Lock inspection cover securely into position with the lock bar, etc. If inspection or maintenance is performed with
inspection cover not locked in position, there is a danger that it may be suddenly shut by the wind and cause
personal injury.

BLEED AIR FROM HYDRAULIC CIRCUIT

When hydraulic equipment is repaired or replaced, or the hydraulic piping is disconnected, the air must be bled
from the circuit. “METHOD FOR BLEEDING AIR FROM HYDRAULIC CIRCUIT (4-44)”When bleeding air, see
“METHOD FOR BLEEDING AIR FROM HYDRAULIC CIRCUIT (4-44)”.

PRECAUTIONS WHEN INSTALLING HYDRAULIC HOSES

• When removing parts at locations where there are O-rings or gasket seals, clean the mounting surface, and
replace them with new parts.
When doing this, be careful not to forget to assemble O-rings and gaskets.
• When installing the hoses, do not twist them or bend them sharply.
If they are installed so, their service life will be extremely shortened and they may be damaged.

CHECKS AFTER INSPECTION AND MAINTENANCE

If you forget to perform the inspection and maintenance, unexpected problems may occur, and this may lead to
personal injury. Always observe the following:
Checks after operation (with engine stopped)
• Have any inspection and maintenance points been forgotten?
• Have all inspection and maintenance items been performed correctly?
• Have any tools or parts been dropped inside the machine? It is particularly dangerous if parts are dropped
inside the machine and get caught in the lever linkage mechanism.
• Are there any leakage of coolant or oil? Have all nuts and bolts been tightened?
Checks while the engine is running
• For details of the checks when the engine is running, see SAFETY, “TWO WORKERS FOR MAINTE-
NANCE WHEN ENGINE IS RUNNING (2-41)” and pay attention to safety.
• Increase the engine speed to check for the leakage of fuel or oil.
• Check if the inspected and serviced area is normally operated.

FUEL AND LUBRICANTS TO MATCH THE AMBIENT TEMPERATURE

It is necessary to select fuel or lubricant according to the ambient temperature.

4-3
PRECAUTIONS FOR MAINTENANCE MAINTENANCE

For details, see “RECOMMENDED FUEL, COOLANT, AND LUBRICANT (7-5)”.

CLOSE ENGINE HOOD SECURELY

When closing the engine hood after inspection or maintenance, make sure that the catch is securely locked.
If the engine hood catch is not locked, there is a danger that the engine hood may open.

4-4
MAINTENANCE OUTLINE OF MAINTENANCE

OUTLINE OF MAINTENANCE
• Komatsu recommends using Komatsu genuine parts for replacement parts, grease or oil.
• When changing the oil or adding oil, do not mix different types of oil. When changing the type of oil, drain all
the old oil and fill completely with the new oil. Always replace the filter at the same time. (There is no prob-
lem if the small amount of oil remaining in the piping mixes with the new oil.)
• Unless otherwise specified, when the machine is shipped from the plant, it is filled with the oil and coolant
listed in the table below.
Item Type
Engine oil pan Engine oil EO15W40-LA (Komatsu genuine)
Damper case
Swing machinery case Power train oil TO30 (Komatsu genuine)
Final drive case
Hydraulic oil system Hydraulic oil HO56-HE (Komatsu genuine)
Non-Amine Engine Coolant (AF-NAC) (Komatsu genuine)
Radiator
(density: 30% or above)

HANDLE OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC

OIL
• Oil is used in the engine and hydraulic equipment under extremely severe conditions (high temperature,
high pressure), and deteriorates with use.
Always use oil that matches the grade and maximum and minimum ambient temperatures recommended in
Operation and Maintenance Manual.
Even if the oil is not dirty, always change the oil at the specified interval.
• Oil corresponds to blood in the human body, always be careful when handling it to prevent any impurities
(water, metal particles, dirt, etc.) from getting in.
The majority of failures with the machine are caused by the entry of such impurities.
Take particular care not to let any impurities get in when storing or adding oil.
• Never mix oils of different grades or brands.
• Always add the specified amount of oil.
Having too much oil or too little oil are both causes of failures.
• If the oil in the work equipment is not clear, there is probably water or air getting into the circuit. In such
cases, consult your Komatsu distributor.
• When changing the oil, always replace the related filters at the same time.
• We recommend that you have an oil analysis periodically to check the condition of the machine. For those
who wish to use this service, consult your Komatsu distributor.
• When using commercially available oil, it may be necessary to reduce the oil change interval. We recom-
mend that you use the Komatsu oil clinic to check the characteristics of the oil in detail.
NOTICE
Komatsu recommends using Komatsu genuine engine oil for KDPF. If engine oil other than Komatsu
genuine oil for KDPF is used, it may shorten cleaning interval of KDPF filters, adversely affect the en-
gine such as deteriorated oil may reduce lubricating function, and it may cause failure, shortening of
the machine life, lowering of performance and increase of fuel consumption.

4-5
OUTLINE OF MAINTENANCE MAINTENANCE

FUEL
• To prevent the moisture in the air from condensing and forming water inside the fuel tank, always fill the fuel
tank with fuel after completing the day's work.
• The fuel pump is a precision equipment, and if fuel containing water or dirt is used, it cannot work properly.
• Be extremely careful not to let impurities get in when storing or adding fuel.
• Always use the fuel specified for the temperature that is described in Operation and Maintenance Manual.
• If the fuel is used at the temperatures lower than the specified temperature (particularly at tempera-
tures below - 15 °C {5 °F} ), the fuel will solidify.
• If the fuel is used at temperatures higher than the specified temperature, the viscosity will drop, and it
may result in troubles such as a drop of output.
• Before starting the engine, or after 10 minutes of adding fuel, drain the sediment and water from the fuel
tank.
• If the engine runs out of fuel, or if the filters are replaced, it is necessary to bleed the air from the circuit.
• If there is any foreign material in the fuel tank, wash the tank and fuel system.
NOTICE
The fuel used must be ultra low-sulfur diesel fuel.
To ensure good fuel consumption characteristics and exhaust gas characteristics, the engine mounted
on this machine uses an electronically controlled high-pressure fuel injection device and emission gas
control system (KDPF). Since the high-pressure fuel injection device requires high precision parts and
lubrication, if low viscosity fuel with low lubricating ability is used, its durability may drop considerably.
And using fuel with high sulfur content can deteriorate the engine parts and KDPF catalyzer, inducing
failures, decrease of the life and degradation in performance.
The ASTM diesel fuel recommended by Komatsu may contain 5 % or less of biofuel. The EN diesel fuel
may contain 7 % or less of it. Use the fuel which is filled into the storage tank or the fuel tank of the
machine as soon as possible.

COOLANT AND WATER FOR DILUTION

• The coolant has the important function of preventing corrosion as well as preventing freezing.
Even in the areas where freezing is not an issue, the use of coolant is essential.
Komatsu machines are supplied with Non-Amine Engine Coolant (AF-NAC). Non-Amine Engine Coolant
(AF-NAC) has excellent anti-corrosion, antifreeze and cooling properties and can be used continuously for
2 years or 4000 hours.
Komatsu recommends the use of Non-Amine Engine Coolant (AF-NAC). If you use another coolant, it may
cause serious problems, such as corrosion of the engine and aluminum parts of the cooling system.
• When using antifreeze, always observe the precautions given in Operation and Maintenance Manual.
• Non-Amine Engine Coolant (AF-NAC) is already diluted with distilled water, so it is not flammable.
• The coolant density needs to be changed according to the ambient temperature.
For details of the coolant density, see “METHOD FOR CLEANING INSIDE OF COOLING SYSTEM
(4-21)”.
Even in areas where it is not considered necessary to prevent freezing, always use Non-Amine Engine
Coolant (AF-NAC) with a density of over 30% in order to prevent corrosion of the cooling system.
Non-Amine Engine Coolant (AF-NAC) is diluted with distilled water that does not contain any ions or water-
hardening substances. Never dilute the Non-Amine Engine Coolant (AF-NAC) with ordinary water.
• If the engine overheats, wait for the engine to cool down before adding coolant.
• If the coolant level is low, it will cause overheating, and will also cause problems with corrosion due to air
entering the coolant.

4-6
MAINTENANCE OUTLINE OF MAINTENANCE

DEF
• If DEF gets on your skin, it may cause inflammation. Immediately take the contaminated clothes or shoes
off and wash it off with water. In addition, use a soap to wash it off thoroughly. If your skin becomes irritated
or begins to hurt, immediately consult a doctor for treatment.
• Do not induce vomiting if swallowed. If swallowed, thoroughly rinse mouth with water and consult a doctor
for treatment.
• Avoid contact with the eyes. If there is contact, flush with clean water for several minutes and consult a doc-
tor for treatment.
• Wear protective eyeglasses when exposed to DEF to protect from solution splashing in your eyes. Wear
rubber gloves when you perform work handling DEF to avoid skin contact.
• When opening the cap of DEF tank of the machine, the ammonia vapor may escape. Keep your face away
from the filler port.
• Do not put fluid other than DEF into DEF tank. If diesel fuel or gasoline is added into the tank, it can cause
a fire. Some fluids or agents added can create and emit a toxic gas.
• DEF is non-flammable; however, in the case of a fire it may generate an ammonia gas. Follow the instruc-
tions and precautions according to “ACTIONS IF FIRE OCCURS (2-18)”.
• If DEF is spilled, immediately wash and clean the area with water. If spilled DEF is left unattended and the
area is not washed and cleaned, it can cause corrosion to the contaminated area and emit toxic gas.
• When disposing of DEF, treat it as an industrial waste. For treatment of the waste, see “PRECAUTIONS
FOR DISPOSING OF WASTE MATERIALS (2-47)”. The container for DEF is an industrial waste as well. It
should be treated in the same way.
• Never use an iron or aluminum container when disposing DEF, because toxic gas may develop and a
chemical reaction may corrode the container. Use a container made of resin (PP, PE) or stainless steel
when handling the fluid waste of DEF.
NOTICE
If you add any additional additive agents or water to DEF, the devices in the Urea SCR system may be
detective, and conformance to the exhaust gas regulations will be lost.

GREASE
• Grease is used to prevent seizure and noises at the joints.
• This construction equipment is used under heavy-duty conditions. Komatsu recommends using the recom-
mended grease and follow the replacement intervals and recommended ambient temperatures given in this
Operation and Maintenance Manual.
• Grease fittings not included in the MAINTENANCE section are the grease fittings for overhaul, so they do
not need grease.
If any part becomes stiff after being used for long time, add grease.
• Always wipe off all of the old grease that is pushed out when greasing.
Be particularly careful to wipe off the old grease in places where sand or dirt sticking in the grease would
cause wear of the rotating parts.

4-7
OUTLINE OF MAINTENANCE MAINTENANCE

PERFORM KOWA (Komatsu Oil Wear Analysis)

KOWA is a maintenance service that makes it possible to prevent machine failures and downtime. With KOWA,
the oil is periodically sampled and analyzed. This enables early detection of wear of the machine drive parts and
other problems.
Thanks to long term experience and ample data accumulated, we can grasp condition of your machine accu-
rately and provide proper recommendation.
We strongly recommend you to use this service. The oil analysis is performed at actual cost, so the cost is low,
and results of the analysis and recommendations are reported promptly.
KOWA ANALYSIS ITEMS
Measurement of metallic powder concentration
An ICP (Inductively Coupled Plasma) analyzer is used for
measuring the concentration of iron, copper, and other metal
powder in the oil.

Measurement of quantity of iron particles

A PQI (Particle Quantifier Index) measuring instrument is used
for measuring the quantity of iron particles of 5 μm or more, en-
abling early detection of failures.

Others
Measurements are made of items such as the ratio of water, coolant, and fuel in the oil, and dynamic viscosity, if
necessary, to enable a highly precise diagnosis of the machine and the components' condition.
Oil sampling interval
500 hours
Precautions when sampling
• Make sure that the oil is well mixed before sampling.
• Perform sampling at regular fixed intervals.
• Do not perform sampling on rainy or windy days when water or dust can get into the oil.
For further details of KOWA, contact your Komatsu distributor.

STORE OIL AND FUEL

• Keep oil and fuel indoors to prevent any water, dirt, or other impurities from getting in.
• When keeping drum cans for a long period, lay the drums so that the filler ports of the drums are located in
the lower part of the side to prevent moisture from being sucked in. If drums have to be stored outside, cov-
er them with a waterproof sheet or take other measures to protect them.
• To prevent any change in quality during long-term storage, be sure to use in the order of first in - first out
(use the oldest oil or fuel first).

4-8
MAINTENANCE OUTLINE OF MAINTENANCE

STORE DEF
• Completely seal up its container for storage. Only open containers in a well-ventilated area.
• When storing DEF, avoid direct sunlight. Always use the original container. Make sure that transfer equip-
ment and tank must meet DEF compatible material specification. If DEF is stored in an iron or aluminum
container, toxic gas may develop and a chemical reaction may corrode the container.
• The relationship between the upper limit of storage temperature and the storage period of DEF is shown in
the table.
Temperature of storage area Storage period
Max.10 °C {50 °F}  Up to 36 months
Max.25 °C {77 °F}  Up to 18 months
Max.30 °C {86 °F}  Up to 12 months
Max.35 °C {95 °F}  Up to 6 months

*: Do not store DEF in the temperature of 35 °C {95 °F}  or above.

For the storage in cold weather, see the section about DEF in “COLD WEATHER OPERATION (3-266)”.

FILTER
• Filters are extremely important safety parts. They prevent impurities in the oil, fuel, and air circuits from en-
tering important equipment and causing problems. Replace all filters periodically. For details, see Operation
and Maintenance Manual.
However, when working in severe conditions, replace the filters at shorter intervals according to the oil and
fuel (sulfur content) being used.
• Never try to clean and use again the filters (cartridge type). Always replace them with new filters.
• When replacing oil filters, check if any metal particles are attached to the old filters.
If any metal particles are found, consult your Komatsu distributor.
• Do not open packages of spare filters until just before they are to be used.
• Komatsu recommends using Komatsu genuine filters.

4-9
OUTLINE OF MAINTENANCE MAINTENANCE

HANDLE ELECTRICAL COMPONENTS

k WARNING
• When the battery disconnect switch key is turned to OFF position for the maintenance work, always
pull out the key and keep it with you. If the key is left in the switch, someone may turn ON the power
by mistake. It is dangerous that causes an electric shock.
For the operation of the battery disconnect switch, see “BATTERY DISCONNECT SWITCH (3-120)”.
• It is extremely dangerous if the electrical component becomes wet or the covering of the wiring is
damaged. This will cause an electrical leakage and may lead to malfunction of the machine. Do not
wash the inside of the operator's cab with water. When washing the machine, be careful not to let
water get into the electrical components.

• When removing the connectors of electrical components after washing the machine or in the rain, wipe off
the water drop stuck around connectors before removing the connectors and keep the water drop away
from inside of the connectors.
• Checking and maintenance items are checking fan belt tension, checking damage of the fan belt and
checking battery fluid level.
• Never install any electrical components other than those specified by Komatsu.
• External electro-magnetic interference may cause malfunction of the control system controller. Accordingly,
consult your Komatsu distributor before installing a radio receiver or other wireless equipment to the ma-
chine.
• When working at the seashore, keep the electrical component clean to prevent corrosion.
• When installing electrical component, connect it to the special power supply connector.
Do not connect the optional power supply to the fuse or starting switch or battery relay, etc.

4-10
MAINTENANCE STANDARD TIGHTENING TORQUE FOR BOLTS AND NUTS

STANDARD TIGHTENING TORQUE FOR BOLTS AND

NUTS
Tightening torque list
k CAUTION
If nuts, bolts, or other parts are not tightened to the specified torque, it will cause looseness or damage
to the tightened parts, and this will cause failure of the machine or problems with operation. Always be
careful when tightening parts.

Unless otherwise specified, tighten the metric nuts and bolts to

the torque shown in the table below.
If it is necessary to replace any nut or bolt, Komatsu recom-
mends using Komatsu genuine part of the same size as the
part that is removed.

Thread Tightening torque

Width
diame-
across Target value Allowable range
ter of
flats “b”
bolt “a”
(mm)  Nm  kgm lbft  Nm  kgm lbft
(mm)
6 10 13.3 1.35 9.8 11.8 to 14.7 1.2 to 1.5 8.7 to 10.8
8 13 30.5 3.15 22.8 27 to 34 2.8 to 3.5 20.3 to 25.3
10 17 66.5 6.75 48.8 59 to 74 6.0 to 7.5 43.4 to 54.2
12 19 111 11.3 81.4 98 to 123 10.0 to 12.5 72.3 to 90.4
14 22 177 18 130 157 to 196 16 to 20 116 to 145
16 24 277 28.3 204 245 to 309 25 to 31.5 181 to 228
18 27 385 39.3 284 343 to 427 35 to 43.5 253 to 315
20 30 549 56 405 490 to 608 50 to 62 362 to 448
22 32 746 76 550 682 to 829 67.5 to 84.5 488 to 611
24 36 927 94.5 684 824 to 1030 84 to 105 608 to 759
27 41 1325 135 976 1180 to 1470 120 to 150 868 to 1080
30 46 1715 175 1270 1520 to 1910 155 to 195 1120 to 1410
33 50 2205 225 1630 1960 to 2450 200 to 250 1450 to 1810
36 55 2745 280 2030 2450 to 3040 250 to 310 1810 to 2240
39 60 3260 333 2400 2890 to 3630 295 to 370 2130 to 2680

4-11
STANDARD TIGHTENING TORQUE FOR BOLTS AND NUTS MAINTENANCE

Tighten the hoses by the following torque shown in the table.

Taper seal
Width Tightening torque
Threa
Nominal across
d size Target value Allowable range
No. of flats
“a”
hose “b”
(mm)  Nm  kgm lbft  Nm  kgm lbft
(mm)
02 14 19 44 4.5 32.5 34 to 63 3.5 to 6.5 25.3 to 47
03 18 22 78 8.0 57.9 59 to 98 6.0 to 10.0 43.4 to 72.3
04 22 27 103 10.5 75.9 84 to 132 8.5 to 13.5 61.5 to 97.6
05 24 32 157 16.0 116 128 to 186 13.0 to 19.0 94 to 137
06 30 36 216 22.0 159 177 to 245 18.0 to 25.0 130 to 181
10 33 41 216 22.0 159 177 to 245 18.0 to 25.0 130 to 181

Face seal
Nominal Width Tightening torque
Nominal size - across
Target value Allowable range
No. of thereads flats
hose per “b”
 Nm  kgm lbft  Nm  kgm lbft
inch“a” (mm)
9/
02 16 19 44 4.5 32.5 34 to 54 3.5 to 5.5 25.3 to 39.8
-18UN
11/
03 16 22 74 7.5 54.2 54 to 93 5.5 to 9.5 39.8 to 68.7
-16UN
13/
04 16 27 103 10.5 75.9 84 to 132 8.5 to 13.5 61.5 to 97.6
-16UN
1
05 32 157 16.0 116 128 to 186 13.0 to 19.0 94.0 to 137.4
-14UNS

1 3/16
06 36 216 22.0 159 177 to 245 18.0 to 25.0 130.2 to 180.8
-12UN

4-12
MAINTENANCE MAINTENANCE SCHEDULE

MAINTENANCE SCHEDULE
• If the machine is equipped with a hydraulic breaker, the maintenance schedule for some parts are different.
Check the maintenance interval and perform maintenance. For detail, see “MAINTENANCE INTERVAL
FOR HYDRAULIC BREAKER (4-15)”.
• When using the engine oil for cold district, the maintenance intervals of the engine oil and filter cartridge are
changed to for every 250 hours. For details, see the oil part number and note in “RECOMMENDED FUEL,
COOLANT, AND LUBRICANT (7-5)”.
• Contact your Komatsu distributor for changing the maintenance interval of the machine monitor.
MAINTENANCE SCHEDULE TABLE
WHEN REQUIRED ........................................................................................................................................ 4-16
METHOD FOR CHECKING, CLEANING AND REPLACING AIR CLEANER .......................................... 4-16
METHOD FOR CLEANING INSIDE OF COOLING SYSTEM ................................................................. 4-21
METHOD FOR CHECKING LOOSENESS AND TIGHTENING TRACK SHOE BOLTS .......................... 4-27
METHOD FOR CHECKING AND ADJUSTING TRACK TENSION ......................................................... 4-28
METHOD FOR REPLACING BUCKET TEETH (VERTICAL PIN TYPE) ................................................. 4-30
METHOD FOR REPLACING BUCKET TEETH (HORIZONTAL PIN TYPE)............................................ 4-33
METHOD FOR REPLACING BUCKET SIDE CUTTER AND SHROUD .................................................. 4-34
METHOD FOR ADJUSTING BUCKET CLEARANCE ............................................................................. 4-35
METHOD FOR CHECKING WINDOW WASHER FLUID LEVEL, ADDING FLUID ................................. 4-36
METHOD FOR CHECKING AND MAINTENANCE AIR CONDITIONER................................................. 4-37
METHOD FOR WASHING WASHABLE FLOOR .................................................................................... 4-39
METHOD FOR CHECKING GAS SPRING ............................................................................................. 4-43
METHOD FOR BLEEDING AIR FROM HYDRAULIC CIRCUIT .............................................................. 4-44
METHOD FOR CLEANING LINE FILTER AND REMOVING DIRT ......................................................... 4-46
CHECKS BEFORE STARTING...................................................................................................................... 4-47
EVERY 50 HOURS MAINTENANCE ............................................................................................................. 4-48
METHOD FOR LUBRICATING WORK EQUIPMENT ............................................................................. 4-48
EVERY 250 HOURS MAINTENANCE ........................................................................................................... 4-49
METHOD FOR CHECKING BATTERY ELECTROLYTE LEVEL ............................................................. 4-49
METHOD FOR CHECKING AND ADJUSTING AIR CONDITIONER COMPRESSOR BELT TENSION.. 4-51
METHOD FOR CHECKING LOOSENESS AND TIGHTENING CONNECTING BOLT BETWEEN CENTER
FRAME AND TRACK FRAME ............................................................................................................. 4-52
METHOD FOR LUBRICATING SWING CIRCLE .................................................................................... 4-53
EVERY 500 HOURS MAINTENANCE ........................................................................................................... 4-54
METHOD FOR LUBRICATING ............................................................................................................... 4-54
METHOD FOR CHANGING OIL IN ENGINE OIL PAN, REPLACING ENGINE OIL FILTER CARTRIDGE .....
............................................................................................................................................................ 4-55
METHOD FOR REPLACING FUEL PREFILTER CARTRIDGE............................................................... 4-56
METHOD FOR CHECKING SWING PINION GREASE LEVEL, ADD GREASE ..................................... 4-58
METHOD FOR CHECKING AND CLEANING RADIATOR FINS, OIL COOLER FINS, AFTERCOOLER
FINS, AND AIR CONDITIONER CONDENSER FINS ......................................................................... 4-59
METHOD FOR CLEANING AIR CONDITIONER FRESH/RECIRC FILTERS.......................................... 4-61
METHOD FOR CHECKING OIL LEVEL IN SWING MACHINERY CASE, ADDING OIL ......................... 4-63
METHOD FOR CHECKING OIL LEVEL IN FINAL DRIVE CASE, ADDING OIL ..................................... 4-64
EVERY 1000 HOURS MAINTENANCE ......................................................................................................... 4-65
METHOD FOR REPLACING HYDRAULIC OIL FILTER ELEMENT ........................................................ 4-65
METHOD FOR CHANGE OIL IN SWING MACHINERY CASE ............................................................... 4-66
METHOD FOR CHECKING AND ADDING OIL IN DAMPER CASE ....................................................... 4-67
METHOD FOR REPLACING FUEL MAIN FILTER CARTRIDGE ............................................................ 4-68
METHOD FOR CHECKING ALL TIGHTENING POINTS OF ENGINE INTAKE PIPE CLAMPS.............. 4-69
METHOD FOR CHECKING AND RELEASING NITROGEN GAS CHARGE PRESSURE IN ACCUMULA-
TOR (FOR BREAKER) ........................................................................................................................ 4-70
METHOD FOR REPLACING HYDRAULIC TANK BREATHER ELEMENT ............................................. 4-70
METHOD FOR REPLACING DEF TANK BREATHER ELEMENT........................................................... 4-71
METHOD FOR CHECKING ALTERNATOR BELT TENSION AND REPLACING ALTERNATOR BELT .. 4-72
EVERY 2000 HOURS MAINTENANCE ......................................................................................................... 4-73

4-13
MAINTENANCE SCHEDULE TABLE MAINTENANCE

METHOD FOR CHANGING OIL IN FINAL DRIVE CASE ....................................................................... 4-73

METHOD FOR CLEANING HYDRAULIC TANK STRAINER .................................................................. 4-74
METHOD FOR CHECKING AND RELEASING NITROGEN GAS CHARGE PRESSURE IN ACCUMULA-
TOR (FOR CONTROL CIRCUIT) ........................................................................................................ 4-75
METHOD FOR CHECKING ALTERNATOR ............................................................................................ 4-78
METHOD FOR CHECKING AND ADJUSTING ENGINE VALVE CLEARANCE ...................................... 4-78
METHOD FOR REPLACING KCCV FILTER ELEMENT ......................................................................... 4-79
METHOD FOR REPLACING DEF FILTER.............................................................................................. 4-82
EVERY 4000 HOURS MAINTENANCE ......................................................................................................... 4-85
REPLACE DEFINED LIFE PARTS.......................................................................................................... 4-85
METHOD FOR CHECKING WATER PUMP............................................................................................ 4-85
METHOD FOR CHECKING STARTING MOTOR.................................................................................... 4-85
METHOD FOR REPLACING ACCUMULATOR (FOR CONTROL CIRCUIT) .......................................... 4-86
METHOD FOR CHECKING FOR LOOSENESS OF ENGINE HIGH-PRESSURE PIPING CLAMP, HARD-
ENING OF RUBBER ........................................................................................................................... 4-87
METHOD FOR CHECKING FOR MISSING FUEL SPRAY PREVENTION CAP, HARDENING OF RUBBER.
............................................................................................................................................................ 4-87
EVERY 4500 HOURS MAINTENANCE ......................................................................................................... 4-88
METHOD FOR CLEANING KDPF .......................................................................................................... 4-88
METHOD FOR CLEANING DEF TANK................................................................................................... 4-88
METHOD FOR CLEANING FUEL DOSER ............................................................................................. 4-88
CHECK FOR MISSING FUEL SPRAY PREVENTION CAP ON FUEL DOSER PIPING, HARDENING OF
RUBBER ............................................................................................................................................. 4-88
EVERY 5000 HOURS MAINTENANCE ......................................................................................................... 4-89
METHOD FOR CHANGING OIL IN HYDRAULIC TANK ......................................................................... 4-89
EVERY 8000 HOURS MAINTENANCE ......................................................................................................... 4-91
METHOD FOR REPLACING ENGINE HIGH-PRESSURE PIPING CLAMP ........................................... 4-91
METHOD FOR REPLACING FUEL SPRAY PREVENTION CAP............................................................ 4-91
EVERY 9000 HOURS MAINTENANCE ......................................................................................................... 4-92
METHOD FOR REPLACING DEF HOSE ............................................................................................... 4-92
METHOD FOR REPLACING FUEL SPRAY PREVENTION CAP ON FUEL DOSER PIPING ................. 4-92

4-14
MAINTENANCE MAINTENANCE SCHEDULE TABLE

MAINTENANCE INTERVAL FOR HYDRAULIC BREAKER

On the machine equipped with a hydraulic breaker, the hydraulic oil and grease deteriorate faster than in normal
bucket digging operations, so set the maintenance intervals as follows.
Replace hydraulic filter element
On a new machine, replace the element after the first 100 to
150 hours, then perform further replacement of the element ac-
cording to the table.
Change oil in hydraulic tank
Change the oil according to the table.
Replace additional filter element for breaker (if equip-
ped)
Use a guideline of 250 hours for use of the breaker (operating
ratio of the breaker: 50% or more), and replace the element ac-
cording to the table.
Replace pilot filter element (if equipped)
Use a guideline of 250 hours for use of the breaker (operating
ratio of the breaker: 50% or more), and replace the element ac-
cording to the table.
X: Breaker operating ratio (%)
Y: Replacement interval (H)
(A):Hydraulic tank element, pilot filter element
(B):Hydraulic oil
(C):Element of additional filter
For detail, see “METHOD FOR REPLACING ADDITIONAL FILTER ELEMENT FOR BREAKER (6-20)” and
“METHOD FOR REPLACING ADDITIONAL PILOT FILTER ELEMENT FOR BREAKER (6-21)”.
REMARK
Breaker operating ratio 100% means that only the breaker is used
Breaker operating ratio 0% means that the breaker is not used
Lubricate
When the hydraulic breaker is equipped, lubricate the machine on 100-hour intervals. For detail, see “METHOD
FOR LUBRICATING (4-54)”.

4-15
MAINTENANCE PROCEDURE MAINTENANCE

MAINTENANCE PROCEDURE
WHEN REQUIRED
METHOD FOR CHECKING, CLEANING AND REPLACING AIR CLEANER
k WARNING
• When using compressed air, there is a danger that dirt may scatter and cause personal injury.
Always wear protective eyeglasses, dust mask, or other protective equipment.
• When removing the outer element from the air cleaner body, it is dangerous to pull it out by force.
When working in high places or where the foothold is poor, be careful not to fall because of the re-
action when pulling out the outer element.

NOTICE
• Do not clean the air cleaner element until the air cleaner clogging caution lamp on the monitor panel
lights up. If the element is cleaned frequently before the air cleaner clogging caution lamp lights up,
the air cleaner will not be able to display its performance fully, and the cleaning efficiency will also
go down.
In addition, during the cleaning operation, more dirt stuck to the element will fall inside the inner
element.
• If any dirt enters the engine, it can damage the engine. Be sure to stop the engine before checking,
cleaning, or servicing the air cleaner. Do not check, clean, or service the air cleaner when strong
wind is blowing or in a dusty place.
When replacing the inner element, take extreme care.
• Replace the outer element if it is cleaned 6 times repeatedly or used throughout a year. Replace the
inner element as well at the same time.

METHOD FOR CHECKING AIR CLEANER

The air cleaner clogging caution lamp informs when the air cleaner element should be checked.
Check that air cleaner clogging caution lamp (1) on the monitor
panel is lit.
If the air cleaner clogging caution lamp lights up, clean the air
cleaner element.

METHOD FOR CLEANING AIR CLEANER OUTER ELEMENT

NOTICE
• Never remove the inner element. If it is removed, dirt will enter and can cause an engine trouble.
• Do not use a screwdriver or other tool.
• When cleaning the element, do not hit it or hit anything with the element.
• Before and after cleaning the element, do not leave or keep it under direct sunlight.
Clean the outer element in the following procedure.

4-16
MAINTENANCE MAINTENANCE PROCEDURE

1. Open the door at the rear left side of the machine, remove
hooks (2) (6 places) and remove cover (3).

2. Hold outer element (5), rock it lightly up and down and to

the right and left, and twist to pull it out.
3. When outer element (5) is removed, check that the inner
element does not come out of position and is not at an an-
gle.
If it is at an angle, push it straight to the bottom with your
hand.
4. After removing outer element (5), cover the inner element
(6) with a clean cloth or tape to prevent dirt or dust from
entering.
5. Clean dusts in inside and on cover (3) of air cleaner body (7) by using a clean cloth or brush.
6. If any dust is attached to vacuator valve (4) installed to
cover (3), remove it.
7. When the outer element has been cleaned 6 times or used
for 1 year, replace it.
• When the element needs to be replaced
Replace the inner and outer elements with new ones.
For details, see METHOD FOR REPLACING ELE-
MENT.
• When the element does not need to be replaced
Clean the outer element. Continue the cleaning proce-
dure.
8. Blow dry compressed air (Max. 0.2 MPa {2.1 kg/cm2}  
{30.0 PSI} ) from the inside of the outer element along the
pleats.
9. Blow along the pleats from the outside, then blow again
from the inside.

10. After cleaning, illuminate the inside of the element with an

electric bulb to check.
If any holes or thin places are found, replace the inner and
outer elements.
11. Remove the cover of cloth or tape attached to inner ele-
ment (6).

4-17
MAINTENANCE PROCEDURE MAINTENANCE

NOTICE
• Do not use the element with damaged pleats or a damaged gasket or seal.
• If the element and O-ring are cleaned and used again after they are used for more than one year, it
will cause problems. Do not use them again.
12. Check the seal of the cleaned or new element for sticking of dusts and oil and wipe them off, if any.
NOTICE
• Be sure to install the air cleaner element facing in the
correct direction. Install so that the bottom of the air
cleaner element (face where no hole is drilled) (B), (C)
comes to cover (3) end. If it is installed in wrong direc-
tion, it may cause breakage of the air cleaner element
or serious damage to the engine.
• When inserting the element into the body, if the rubber
at the tip is swollen or the outer element is not pushed
in straight, and cover (3) is installed by force with
hook (2), there is a danger that the hook and air clean-
er body may be damaged, so be careful when instal-
ling.
13. Push the outer element in straight with your hand when installing it to the air cleaner body.
Hold the outer element, and rock it lightly up and down and to the right and left while pushing it in, the outer
element can be inserted easily.
14. Install cover (3) as follows.
1) Check that O-ring (8) is fitted to cover (3).
2) Align cover (3) with the element.

3) Lock the tip of hook (2) on the protrusion of the air

cleaner body.
4) Lock hooks (2) diagonally, (top and bottom, right and
left) in the same way as when tightening the bolts.

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MAINTENANCE MAINTENANCE PROCEDURE

5) Always install cover (3) so that vacuator (4) faces the

ground (A).
6) When cover (3) is installed, check that the clearance
between the air cleaner body and cover (3) is not too
large.
If the clearance is too large, remove cover (3), and
then install it again.
15. Check that air cleaner clogging caution lamp (1) on the
monitor panel.
If it light up just after cleaning of the elements has been
finished, replace the inner and outer elements.

METHOD FOR CHANGING AIR CLEANER ELEMENT

Replace the outer element in the following procedure.
1. Open the door at the rear left side of the machine, remove
hooks (2) (6 places) and remove cover (3).

2. Hold outer element (5), rock it lightly up and down and to the right and left, and twist to pull it out.
Do not remove inner element (6) at this time.
3. When outer element (5) is removed, check that the inner
element does not come out of position and is not at an an-
gle.
If it is at an angle, push it straight to the bottom with your
hand.

4. Clean dusts in inside and on cover (3) of air cleaner body

(7) by using a clean cloth or brush.
5. If any dust is attached to vacuator valve (4) installed to
cover (3), remove it.

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MAINTENANCE PROCEDURE MAINTENANCE

NOTICE
• Do not clean and reuse the inner element. When replacing the outer element, replace the inner ele-
ment with a new one at the same time.
• If the outer element and cover are installed while the inner element is not installed properly, the out-
er element may be damaged.
• The sealing portion of the improper part lacks precision, and allows the entry of dust, which leads
to damage of the engine. Do not use such improper part.
6. Remove inner element (6), then quickly install the new inner element.
Install the inner element securely so that it does not move.
7. Push new outer element (5) in straight with your hand into the air cleaner body.
Hold the element, and rock it lightly up and down and to the right and left while pushing it in, the element
can be inserted easily.
8. Install cover (3) as follows.
1) Check that O-ring (8) is fitted to cover (3).
2) Align cover (3) with the element.

3) Lock the tip of hook (2) on the protrusion of the air

cleaner body.
4) Lock hooks (2) diagonally, (top and bottom, right and
left) in the same way as when tightening bolts.

5) Always install cover (3) so that vacuator (4) faces right

below (A).
6) When cover (3) is installed, check that the clearance
between the air cleaner body and cover (3) is not too
large.
If the clearance is too large, remove cover (3), and
then install it again.

CHECK AND REPLACE VACUATOR VALVE

Check vacuator valve (4) for damage and deformation of its rubber portion.
If the vacuator is damaged or its rubber part is deformed, replace it.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR CLEANING INSIDE OF COOLING SYSTEM

k WARNING
• Immediately after the engine is stopped, the coolant is still hot and the pressure is accumulated in
the radiator. If the cap is removed under this condition and the coolant is drained, it may cause
burns. Accordingly, wait until the coolant temperature drops, then turn the cap slowly to release the
pressure.
• When starting the engine while cleaning the machine, set the lock lever in LOCK position to prevent
the machine from moving.
• When the undercover is removed, there is a danger of touching the fan.
Never enter in the rear part of the machine when the engine is running.

Place the machine on a level ground when cleaning or changing the coolant.
Clean the inside of the cooling system, change the coolant according to the table below.
Cleaning of inside of cooling system and re-
Coolant
placement of coolant
Non-Amine Engine Coolant Every 2 year or
(AF-NAC) 4000 hours, whichever comes sooner

The coolant has the important function of preventing corrosion as well as preventing freezing.
Even in the areas where freezing is not an issue, the use of coolant is essential.
Komatsu machines are supplied with Non-Amine Engine Coolant (AF-NAC). Non-Amine Engine Coolant (AF-
NAC) has excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or
4,000 hours.
Komatsu recommends the use of Non-Amine Engine Coolant (AF-NAC). If you use another coolant, it may
cause serious problems, such as corrosion of the engine and aluminum parts of the cooling system.
To maintain the anticorrosion properties of Non-Amine Engine Coolant (AF-NAC), always keep the density of
Non-Amine Engine Coolant between 30% and 64%.
Non-Amine Engine Coolant (AF-NAC) is already diluted with distilled water. When using coolant, investigate the
lowest temperature in the past and decide the density for the coolant from the coolant density table below.
When deciding the density for the coolant, set it for a temperature 10 °C 50 °F below the actual lowest tempera-
ture in the working area.
The coolant density varies according to the ambient temperature, but it must be over 30% at least.

Coolant density table

Min. atmospheric tem- °C Min. -10 -15 -20 -25 -30 -35 -40 -45 -50
perature  °F Min. 14 5 -4 -13 -22 -31 -40 -49 -58
Density (%) 30 36 41 46 50 54 58 61 64

k WARNING
• Coolant is toxic. When opening the drain valve, be careful not to get coolant on you. If it gets in
your eyes, flush your eyes with large amount of fresh water and see a doctor immediately.
• When handling the cooling water containing coolant that has been drained during changing the
coolant or repair of radiator, contact your Komatsu distributor or request a qualified company to
perform the operation. Coolant is toxic, so never pour it into drainage ditches or drain it onto the
ground surface.

Non-Amine Engine Coolant (AF-NAC) is already diluted with distilled water, so it is not flammable.
Check the density with a coolant tester.

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MAINTENANCE PROCEDURE MAINTENANCE

Prepare a container whose capacity is larger than the specified coolant volume to catch drained coolant.
Clean the inside of the cooling system according to the following procedure.
1. Place the machine on a level ground, then stop the engine.
2. Remove bolts (A) (2 pieces), then open cover (1).

3. Check that the coolant temperature is low enough to make

it possible to touch the radiator cap surface by bare hand,
turn radiator cap (2) slowly until it hits the stopper, and re-
lease the pressure.
4. While pushing radiator cap (2), turn it until it touches to the
stopper, then remove it.

5. Remove drain valve cover (3) on the radiator side and

drain valve cover (4) on the engine side.

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MAINTENANCE MAINTENANCE PROCEDURE

6. Place containers under drain valve (5) on the radiator side

and drain valve (6) on the engine side to receive the cool-
ant.
7. Open drain valves (5) and (6) to drain the coolant.
8. After draining the coolant, close drain valves (5) and (6)
and fill with city water.
Pour water until it fills the radiator.
9. Start the engine.
For details of starting the engine, see OPERATION,
“METHOD FOR OPERATIONS AND CHECKS BEFORE
STARTING ENGINE (3-181)” and “METHOD FOR START-
ING ENGINE (3-183)”.

10. Set the swing lock switch to ON position and check that
the swing lock pilot lamp is lit.

11. To complete the warm-up operation of the hydraulic equipment more quickly, set the working mode to P
mode (heavy-duty mode).
For the details of the working mode setting procedure, see
“METHOD FOR SELECTING WORKING MODE (3-208)”.

12. Move the lock lever slowly and steadily to FREE position
(F), then raise the bucket from the ground.

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MAINTENANCE PROCEDURE MAINTENANCE

13. Turn the fuel control dial to a point midway between Low
idle (MIN) and High idle (MAX).

NOTICE
When the work equipment is operated, take care that it does not interfere with the machine or ground.
14. Operate the work equipment control levers according to
the following procedure.
1) Move the R.H. work equipment control lever slowly in
the direction to the bucket CURL side (D). Operate the
lever to the end of its travel and hold it in position for
30 seconds.
2) Move the R.H. work equipment control lever slowly in
the direction to the bucket DUMP side (C). Operate
the lever to the end of its travel and hold it in position
for 30 seconds.
3) Move the L.H. work equipment control lever slowly in
the direction to the arm IN side (B). Operate the lever to the end of its travel and hold it in position for
30 seconds.
4) Move the L.H. work equipment control lever slowly in the direction to the arm OUT side (A). Operate
the lever to the end of its travel and hold it in position for 30 seconds.
When the operations of steps 1) to 4) are repeated, the
pointer of the engine coolant temperature gauge rises. The
pointer of the engine coolant temperature gauge moves
down temporarily around the center of scale (E). Then,
continue the operation for approximately 10 minutes.

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MAINTENANCE MAINTENANCE PROCEDURE

15. Stop the engine and open drain valves (5) and (6) to drain
the coolant.

16. Open the engine hood, drain the coolant from sub-tank (7),
clean the inside of the sub-tank, then fill with Non-Amine
Engine Coolant to the middle between FULL and LOW
marks.
NOTICE
If the sub-tank is extremely dirty and it is difficult to
clean, replace it with a new one.
17. After draining the coolant, clean the sub-tank with deter-
gent liquid.
For the cleaning method, follow the instruction for the de-
tergent liquid.

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MAINTENANCE PROCEDURE MAINTENANCE

18. Close drain valves (5) and (6).

19. Install covers (3) and (4).

20. Add Non-Amine Engine Coolant through the coolant filler
port up to the mouth of the port.
For details of the coolant density, see “Coolant density ta-
ble”.

21. Run the engine at low idle for 5 minutes to remove the air from the coolant, then run at high idle for a further
5 minutes.
Keep radiator cap (2) removed during the above opera-
tions.
22. Stop the engine, wait for approximately 3 minutes, then
add Non-Amine Engine Coolant up to the bottom of the
water filler port, and tighten the radiator cap (2).

23. Close the engine hood, tighten bolts (A) (2 pieces), and in-
stall cover (1).

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR CHECKING LOOSENESS AND TIGHTENING TRACK SHOE

BOLTS
NOTICE
If the machine is used with track shoe bolts loose, they will break. If any looseness of the shoe bolt is
found, retighten it.
1. Check for looseness of the shoe bolt (1).

2. If any looseness of the bolt is found, tighten it in order

shown in the figure.
Tightening torque: 392 ± 39 Nm {40 ± 4 kgm, 289 to 29
lbft}
3. Check that the nut and shoe are in close contact with the
link contact surface.
4. After checking, tighten a further 120 ± 10 °.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR CHECKING AND ADJUSTING TRACK TENSION

The wearing of the pins and bushings in the undercarriage depends on the working condition and type of soil.
Check the track tension occasionally and keep it in the standard range.
For performing the inspection and adjustment of the track shoes, park the machine on the level and solid
ground.

METHOD FOR CHECKING TRACK TENSION

1. Run the engine at low idle, then move the machine forward for a distance equal to the track length on
ground, and slowly stop the machine.
2. Place straight wooden square bar (3) which reaches from
idler (1) to carrier roller (2) on the track.
3. Measure the maximum deflection (a) between the bottom
surface of the wooden bar and top surface of the track
shoes.
Standard deflection
Deflection "a" should be 16 to 34 mm {0.6 to 1.3 in} .

If the deflection is out of the standard value range, adjust it into the standard value range.

METHOD FOR INCREASING TRACK TENSION

Items to be prepared
Grease pump
1. Pump in grease through grease fitting (2) by using a grease pump.
Grease fitting (2) forms one part with plug (1).
2. To check if the tension is correct, run the engine at low
idle, move the machine slowly forward (by an amount
equal to the length of track on ground), then stop the ma-
chine.
3. Check the track tension again, and if the tension is not cor-
rect, adjust it again.

4. Grease can be pumped in until dimension (S) becomes

zero (0). If the track tension is still loose, the pins and
bushings are excessively worn. The pins and bushings
must be either turned or replaced. Ask your Komatsu dis-
tributor for repair.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR DECREASING TRACK TENSION

k WARNING
Never loosen plug (1) more than 1 turn.
If it is loosened more than 1 turn, there is a danger of plug
(1) flying out under the high internal pressure of the
grease.
Never loosen any part other than plug (1). Never put your
face in the mounting direction of plug (1).

1. Loosen plug (1) gradually to release the grease.

2. If the grease does not come out smoothly, move the ma-
chine forward and backward a short distance.
3. Tighten plug (1).
4. To check if the tension is correct, run the engine at low idle, move the machine slowly forward (by an
amount equal to the length of track on the ground), then stop the machine.
5. Check the track tension again, and if the tension is not correct, adjust it again.
If the track tension cannot be decreased by the above procedure, ask your Komatsu distributor for repair.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR REPLACING BUCKET TEETH (VERTICAL PIN TYPE)

Replace the bucket teeth before the adapter starts to wear.

k WARNING
It is dangerous if the work equipment moves by mistake when the tooth is being replaced.
Set the work equipment in a stable condition, set the lock lever securely to LOCK position and stop the
engine.
As the pin is driven out with strong force, it is dangerous that the pin may fly out. Check that there is no
people in the surrounding area.
Broken pieces may fly during the replacement work, so always wear the protective equipment such as
protective eyeglasses and gloves.

1. To make it possible to drive out a pin of tooth (1), put block

(5) under the bottom of the bucket, and make the bottom
of the bucket horizontal.

2. Check that the work equipment is in a stable condition,

then set the lock lever to LOCK position (L).

3. Use a hammer and drift to knock out lock pin (2).

If the drift is set against rubber pin lock (3) when it is hit,
the rubber pin lock may break. Set it against the back of
the pin.
4. After removing lock pin (2) and rubber pin lock (3), check
them.
5. If lock pin (2) and rubber pin lock (3) are used in the condi-
tion below, it will cause tooth (1) to come off during opera-
tion. Check the shape of the parts. If they have any dam-
age, replace them.
• Lock pin (2) is too short.
Dimension (B) is 1/3 or more of dimension (A) when
lock pin (2) is aligned with bottom face (C).

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MAINTENANCE MAINTENANCE PROCEDURE

• The steel ball is about to come off.

Rubber (6) of the rubber pin lock is broken.

• The steel ball sinks.

The rubber of the rubber pin lock is deteriorated and
steel ball sinks into it when you press it.
6. Remove the soil stuck to adapter (4) by using a knife.

7. Use your hand or a hammer to push rubber pin lock (3) in-
to the hole of adapter (4).
When doing this, be careful that rubber pin lock (3) does
not fly out from the adapter surface.
8. Clean the inside of teeth (1), then install it to adapter (4).
If there is mud affixed to it or if there are protrusions, the
teeth (1) will not enter adapter (4) properly, and there will
not be proper contact at the mating portion.

9. Fit tooth (1) to adapter (4), and check that when tooth (1) is pressed strongly, the rear face of the hole for
the pin of teeth (1) is at the same level as the rear face of the hole for the pin of adapter (4).
If the rear face of the pin hole of tooth (1) protrudes in front of the rear face of the pin hole of adapter (4), do
not knock the pin in.
There is sticking matter (C) which prevents tooth (1) from
fitting into adapter (4) perfectly.
Find out the sticking matter and remove it. Fit tooth (1) into
adapter (4) sufficiently, and then knock in lock pin (2).

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MAINTENANCE PROCEDURE MAINTENANCE

10. Insert lock pin (2) in the pin hole in tooth (1), and knock it
in so that the top surface of lock pin (2) is the same height
as the surface of tooth (1).

11. After replacing a bucket tooth, always check the following.

• After lock pin (2) is driven in completely, check that it
is secured by tooth (1) and surface.
• Lightly hit lock pin (2) in the reverse direction from
which it was hit in.
• Lightly hit the tip of tooth (1) from above and below,
and hit its sides from right and left.
• Confirm that rubber pin lock (6) and lock pin (2) are
set as shown in the right figure.

REMARK
If the tooth is turned, the wear will become uniform. This will extend the service life of the tooth and reduce the
frequency of replacement.
When replacing the tooth, replace the rubber pin lock and lock pin with new parts at the same time. This will
prevent the tooth from falling out.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR REPLACING BUCKET TEETH (HORIZONTAL PIN TYPE)

Replace the bucket teeth before the adapter starts to wear.

k WARNING
• It is dangerous if the work equipment moves by mistake when the tooth is being replaced.
Set the work equipment in a stable condition, set the lock lever securely to LOCK position and stop
the engine.
• As the pin is driven out with strong force, it is dangerous that the pin may fly out. Check that there
is no people in the surrounding area.
• Broken pieces may fly during the replacement work, so always wear the protective equipment such
as protective eyeglasses and gloves.

1. To pull out pin (1) of tooth (2), put block (5) under the bot-
tom of the bucket, and make the bottom surface of the
bucket horizontal.　

2. Check that the work equipment is in a stable condition,

then set the lock lever to LOCK position (L).

3. Place a bar on the head of pin (1), hit the bar with a ham-
mer to knock out the pin, then remove tooth (2).
REMARK
If it cannot be removed by this method, ask your Komatsu
distributor to have the replacement performed.

4. Clean the mounting face. Fit a new tooth (2) in the adapter,
push in pin (1) partially by hand, then lock it with a hammer
to install the tooth to the bucket.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR REPLACING BUCKET SIDE CUTTER AND SHROUD

k WARNING
It is dangerous if the work equipment moves by mistake
when replacing the side cutter and shroud of the bucket.
Set the work equipment in a stable condition, set the lock
lever securely to LOCK position (L) and stop the engine.
As the pin is driven out with strong force, it is dangerous
that the pin may fly out. Check that there is no people in
the surrounding area.
Broken pieces may fly during the replacement work, so al-
ways wear the protective equipment such as protective
eyeglasses and gloves.

METHOD FOR REPLACING BUCKET SIDE CUTTER

1. Loosen mounting bolts (2), then remove side cutter (1).
2. Replace the side cutter, bolts, and nuts with new ones.
Tightening torque of bolt: 3040 to 3630 Nm {310 to 370
kgm, 2240 to 2680 lbft}

METHOD FOR REPLACING SHROUD

1. Put a rod to pin (1) and drive out pin (1) with a hammer.
Shroud (2) can be removed.
2. Clean the mounting face and fit new shroud (2) to adapter
(3).
3. Insert pin (1) half way, then drive it in fully with a hammer.
4. Install it to the bucket.

REMARK
If it cannot be removed by this method, ask your Komatsu distributor to have the replacement performed.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR ADJUSTING BUCKET CLEARANCE

k WARNING
It is dangerous if the work equipment moves by mistake
when adjusting the bucket clearance.
Lower the work equipment to the ground stably, set the
lock lever securely to LOCK position, and stop the engine.

1. Set the work equipment in the posture shown in the figure,

set the lock lever to LOCK position (L), and stop the en-
gine.
2. Shift O-ring (1) and measure the amount of play "a".
Measurement is easier if you move the bucket to one side so that all the play can be measured at 1 place
(the right side in the figure).
Use a clearance gauge for easy and accurate measure-
ment.
3. Loosen plate mounting bolts (2) (4 pieces) and loosen
plate (3).
The shim is a split type, so the work can be performed
without removing the bolts.
4. Remove shim (4) corresponding to the amount of play "a".
For shim (4), 2 types of 1.0 mm {0.04 in}  and 0.5 mm 
{0.02 in}  are installed.
When play "a" is smaller than 1 shim, do not adjust it.
5. Tighten bolts (2) (4 pieces).
If bolts (2) are too stiff to tighten, pull out pin stopper bolt
(5) for easier tightening.
(6) Arm
(7) Bucket
[Example] In the case of play of 3 mm {0.12 in} , remove
1.0 mm {0.04 in}  (2 pieces) shims and 0.5 mm {0.02 in}  (1
piece) shim. Play becomes0.5 mm {0.02 in} .

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR CHECKING WINDOW WASHER FLUID LEVEL, ADDING FLUID

1. If air is in the window washer fluid, check the fluid level in
window washer tank (1).
2. If the level is low, add window washer fluid for automobile.
Be careful not to let dirt or dust get in when adding fluid.

Mixture ratio of pure washer fluid and water

The proper mixing proportion varies with the ambient temperature. Add washer fluid diluted with water at the
following proportion.
Area, season Mixing proportion Freezing temperature
Normal Washer fluid 1/3: water 2/3 -10 °C {14 °F} 
Winter in cold district Washer fluid 1/2: water 1/2 -20 °C {-4 °F} 
Winter in extremely cold district Pure washer fluid -30 °C {-22 °F} 

There are 2 types of -10 °C {14 °F} (for general use) and -30 °C {-22 °F}  (for cold district). Use them properly
according to the area and season.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR CHECKING AND MAINTENANCE AIR CONDITIONER

Check, maintenance items
Some maintenance items of the air conditioner are to be inspected periodically and the others are to be inspect-
ed when required. Check and maintenance the air conditioner according to the following list to use it effectively.
Check and mainte- Content of check and maintenance Guideline for maintenance interval
nance items
Refrigerant (gas) Charge amount Twice a year (spring, autumn)
Air conditioner con- Clogged fins Every 500 hours
denser
“METHOD FOR CHECKING AND CLEANING
RADIATOR FINS, OIL COOLER FINS, AFTER-
COOLER FINS, AND AIR CONDITIONER
CONDENSER FINS (4-59)”
Compressor Operating condition Every 4000 hours
V-belt Damage, tension Every 250 hours
“METHOD FOR CHECKING AND ADJUSTING
AIR CONDITIONER COMPRESSOR BELT
TENSION (4-51)”
Blower motor, fan Operating condition (Does it make ab- When required
normal noise?)
Control mechanism Operating condition (Does it function When required
normally?)
Piping mounts Mounting condition, looseness at tight- When required
ening or connecting portions, leakage
of gas, damage

Even during the off-season, operate the air conditioner for 3 to 5 minutes once a month to maintain the oil film at
all parts of the compressor.

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MAINTENANCE PROCEDURE MAINTENANCE

Check level of refrigerant (gas)

k WARNING
If the refrigerant used in the air conditioner gets into your eyes or is splashed on your hands, it may
cause loss of sight or frostbite. Never touch the refrigerant. Do not loosen any part of the refrigerant
circuit.
Do not bring any open flame close to any point where the refrigerant gas is leaking.

If the level of the refrigerant (gas) is low, the cooling effect will be reduced. Perform the check while running the
engine at full throttle and operating the air conditioner at high speed.
Check the condition of the refrigerant gas (chlorofluorocarbon
R134a) that circulates the refrigerant circuit, through sight glass
(1) (inspection window) at the refrigerant hose fitting.

(A) No bubbles in refrigerant flow: Suitable

(B) Some bubbles in refrigerant flow: Insufficient (bubbles pass
continuously)
(C) Colorless, transparent: No refrigerant

REMARK
When there are bubbles, the refrigerant gas level is low, so contact your Komatsu distributor to have refrigerant
added. If the air conditioner is run with the refrigerant gas level low, it will cause damage to the compressor.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR WASHING WASHABLE FLOOR

On the washable cab floor, it is possible to flush out the dirt directly with water.

k WARNING
If the control lever is touched by accident, the machine
may move suddenly, and this may lead to serious personal
injury or death. Always set the lock lever securely to LOCK
position (L) before leaving the operator's seat.
Select a firm flat place for work.
When setting the machine at an angle, use strong blocks
to stabilize the base of the machine and be extremely care-
ful when performing the work.

METHOD FOR CLEANING WASHABLE FLOOR MAT

1. Stop the machine on a level ground, lower the bucket to
the ground, stop the engine, and then perform the cleaning
2. When washing the floor mat, use a brush to remove the
dust, or directly water the mat to wash it with a brush.

METHOD FOR CLEANING CAB FLOOR

NOTICE
When performing this work, be careful not to splash water
onto the monitor and connectors inside the operator's cab.
Never splash water on the things above the pedestal of the
operator's seat (4).
If any water splashes on the surrounding equipment, be
sure to wipe it off.
1. Set the machine at angle.
Referring to “METHOD FOR SETTING MACHINE AT AN-
GLE (4-41)”, select a safe method, depending on the
state of the machine.
In this example, the machine is set at angle by using blocks.

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MAINTENANCE PROCEDURE MAINTENANCE

2. Swing the upper structure slowly so that water drain holes

(3) in the cab floor are at a low position.

3. Lower the work equipment to the ground and set the ma-
chine in a stable condition.

4. Set lock lever (1) to LOCK position (L) and stop the en-
gine.

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MAINTENANCE MAINTENANCE PROCEDURE

5. Pull out projections (2) (6 places) on the back of the floor

mat and remove the floor mat.
6. Remove the cap from water drain hole (3).
7. Flush out the dirt on the floor directly with water through
water drain hole (3).
8. After completing the washing work, install the cap in water
drain hole (3).

9. Fit the floor mat and secure it by inserting projections (2)

into the holes.

METHOD FOR SETTING MACHINE AT ANGLE

You can set the machine at an angle by using a slope or blocks. Consider the condition of the machine and
select the safe method.

METHOD FOR USING SLOPE

k WARNING
Select a solid and smooth slope.
Always block the tracks from movement, and thrust the work equipment into the ground.

1. Stop the machine with the work equipment on the downhill side on a slope.
2. Block the tracks from movement and thrust the work
equipment into the ground.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR USING BLOCK

k WARNING
Select a firm flat place.
Put strong blocks under the undercarriage to stabilize the machine and be extremely careful when per-
forming the operation.

1. Raise the machine off the ground by using the boom and arm.
When doing this, operate the levers slowly.
2. Place block (5) under the raised track and make sure that
the machine is stable.

3. Raise the boom slowly and lower the machine.

When doing this, check that the machine is always stable.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR CHECKING GAS SPRING

k WARNING
The gas spring is charged with high-pressure nitrogen gas, so improper handling may cause an explo-
sion resulting in serious personal injury or death. When handling, always observe the following.
• Do not disassemble.
• Do not bring open flame close to it or do not dispose of it in fire.
• Do not perform drilling, welding or flame-cutting.
• Do not hit or roll it, or subject it to any impact.
• When disposing of it, the gas must be released. Ask your Komatsu distributor to have this work per-
formed.

The gas springs are located at the engine hood (2 places on

right and left sides) and the ceiling window of cab (2 places on
right and left sides).
In the following cases, ask your Komatsu distributor for inspec-
tion, repair, and replacement.
• The engine hood or cab ceiling window is heavy to open.
• The cab ceiling window does not stay open.
• Oil or gas is leaking from the gas spring.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR BLEEDING AIR FROM HYDRAULIC CIRCUIT

When starting the engine, see “METHOD FOR STARTING ENGINE (3-183)”. If necessary, see the paragraphs
for starting the engine, and moving/steering/stopping the machine in OPERATION section.

METHOD FOR BLEEDING AIR FROM PUMP

NOTICE
If the drain hose is installed first, oil will spurt out from bleeder (1) hole.
If the pump is operated without filling the pump case with hydraulic oil, abnormal heat will be generated
and this may cause a premature damage to the pump.
1. Loosen air bleeders (1) (2 places) and check that oil oozes out from the air bleeder.
2. If the oil does not ooze out, remove drain hose (2) from the
hydraulic pump case and fill the pump case completely
with hydraulic oil through drain port.
Oil will come out when the drain hose is removed, so se-
cure the hose fitting at a position higher than the level of
the oil in the hydraulic tank.
3. After completing the air bleed operation, tighten air bleeder
(1) and install the drain hose.

METHOD FOR STARTING ENGINE

Start the engine according to “METHOD FOR STARTING ENGINE (3-183)” and run it at low idle for 10 minutes,
and then start the following work.

METHOD FOR BLEEDING AIR FROM CYLINDER

NOTICE
If the engine runs at high speed immediately after startup or a cylinder is operated to its stroke end, air
taken inside the cylinder may cause damage to the piston packing.
1. Start the engine.
2. Turn the fuel control dial to Low idle (MIN) position.
3. Move each cylinder to approximately 100 mm {3.9 in}  before the stroke end, and repeat the operation 4 to
5 times.
Take care not to move the cylinder to the stroke end.
4. Turn the fuel control dial to High idle (MAX) position.
5. Move each cylinder to approximately 100 mm {3.9 in}  before the stroke end, and repeat the operation 4 to
5 times.
Take care not to move the cylinder to the stroke end.
6. Turn the fuel control dial to Low idle (MIN) position.
7. Operate each cylinder 4 to 5 times to the end of its stroke to completely remove the air.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR BLEEDING AIR FROM SWING MOTOR

NOTICE
• When bleeding air, do not operate the swing.
• If the air is not bled from the swing motor, the motor bearings may be damaged.
1. Run the engine at low idle, loosen hose (3) at port S, and
check that oil oozes out from port S hose (3).
2. If oil does not ooze out, stop the engine, remove port S
hose (3), and fill the motor case with hydraulic oil.

When replacing the travel motor safety valve, ask your Komatsu distributor for the replacement and the air
bleeding.

METHOD FOR BLEEDING AIR FROM TRAVEL MOTOR

Bleed air only when the oil inside the travel motor case is drained.
1. Run the engine at low idle, loosen air bleeder (4), and
tighten it when oil flows out.
2. Run the engine at low idle and swing the upper structure
90 ° to bring the work equipment to the side of the track.

3. Push up the machine until the track is raised slightly from the ground. Perform idle rotation of track for 2
minutes. Repeat this procedure on both the right and left sides.
REMARK
When rotating the track at idle, rotate equally both forward
and in reverse.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR BLEEDING AIR FROM ATTACHMENT (WHEN ATTACHMENT IS

EQUIPPED)
NOTICE
• If the method of air bleeding from the attachment is specified by the manufacturer, bleed the air ac-
cording to the specified procedure.
• After completing the air bleeding operation, stop the engine, and leave the machine for 5 minutes
before starting operations. This will remove the air bubbles in the oil inside the hydraulic tank.
If a breaker or other attachment is installed, perform the air bleeding procedure until the air is completely bled
from the attachment circuit.
1. Turn the fuel control dial to Low idle (MIN) position.
2. Repeat operating the attachment approximately 10 times to bleed air.
3. Check that there is no leakage of oil and wipe off any oil that is spilled.
4. After completing the air bleeding operation, check the oil level, and if the oil level is low, add oil.

METHOD FOR CLEANING LINE FILTER AND REMOVING DIRT

(if equipped)
If any abnormality is found in hydraulic components such as pumps, remove the dirt from the line filter as fol-
lows.
Before removing the line filter, release the internal pressure in the hydraulic circuit referring to “METHOD FOR
CHECKING AND RELEASING NITROGEN GAS CHARGE PRESSURE IN ACCUMULATOR (FOR CONTROL
CIRCUIT) (4-75)”.
The line filter is at the position shown with the arrow.

1. Remove plug (2).

2. Remove filter (1).
3. Clean filter (1).
Thoroughly clean the filter to remove dirt from its side face,
as well.
4. Replace O-ring (3) with a new one.
5. Install cleaned filter (1).
Tightening torque for plugs (2): 270 ± 30 Nm {27.5 ± 3
kgm, 199 ± 22 lbft}
After assembling the line filter, bleed air. For the procedure, see “METHOD FOR BLEEDING AIR FROM HY-
DRAULIC CIRCUIT (4-44)”.

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MAINTENANCE MAINTENANCE PROCEDURE

CHECKS BEFORE STARTING

For the following items, see OPERATION, METHOD FOR CHECKING BEFORE STARTING (3-152).
• Method for draining water and sediment from fuel tank
• Method for checking water separator, draining water and sediment
• Method for checking oil level in hydraulic tank, adding oil
• Method for checking coolant level, adding coolant
• Method for checking oil level in engine oil pan, adding oil
• Method for checking electric wiring
• Method for checking fuel level, adding fuel
• Check DEF level, add DEF
• Method for checking working lamp
• Method for checking horn function

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MAINTENANCE PROCEDURE MAINTENANCE

EVERY 50 HOURS MAINTENANCE

METHOD FOR LUBRICATING WORK EQUIPMENT
NOTICE
If any abnormal noise is generated from any greasing point, perform greasing regardless of the greas-
ing interval.
Perform greasing every 10 hours for the first 50 hours operation on a new machine.
After the machine is subjected to digging work in the water, be sure to grease the wet pins.
Items to be prepared
Grease pump
1. Park the machine on a level and firm ground, lower the
work equipment to the ground in the posture shown in the
figure, and stop the engine.

2. By using a grease pump, pump in grease through the grease fittings shown by arrows.
(1) Arm-Link connection pin (1 place)
(2) Arm and Bucket connection pin (1 place)

(3) Link connection pin (2 places)

(4) Bucket cylinder rod end pin (1 place)
(5) Bucket and Link connection pin (1 place)

3. After greasing, wipe off any old grease that is pushed out.

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MAINTENANCE MAINTENANCE PROCEDURE

EVERY 250 HOURS MAINTENANCE

Maintenance for every 50 hours service should be performed at the same time.

METHOD FOR CHECKING BATTERY ELECTROLYTE LEVEL

Perform this procedure before operating the machine.
Inspect the battery electrolyte level according to the standard at least once a month.

k WARNING
Do not use the battery if the battery electrolyte level is below LOWER LEVEL line. If you do so, it will
reduce the service life of the battery. In addition, it may cause an explosion.
The battery generates flammable gas and there is a danger of explosion. Do not bring any open flame
near the battery.
Battery electrolyte is dangerous object. If it gets in your eyes or on your skin, wash it off with a large
amount of water and consult a doctor.

NOTICE
Do not add the electrolyte to the battery exceeding UPPER LEVEL line. If the electrolyte level is too
high, it may leak and cause damage to the paint surface or corrode other parts.
If there is a fear that the battery water may freeze after refilling with purified water (such as a commer-
cial battery fluid), do the replenishment before the day's work on the next day.
Open cover (1) at the right front of the machine and you find
the battery.

METHOD FOR CHECKING ELECTROLYTE LEVEL FROM SIDE OF BATTERY

If it is possible to check the electrolyte level from the side of the battery, check as follows.

k WARNING
If the battery is wiped with a dry cloth, static electricity may cause a fire or explosion.

1. Use a wet cloth to clean the area around the electrolyte

level lines and check that the electrolyte level is between
UPPER LEVEL (U.L.) and LOWER LEVEL (L.L.) lines.

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MAINTENANCE PROCEDURE MAINTENANCE

2. If the electrolyte level is below the middle between UPPER

LEVEL (U.L.) and LOWER LEVEL (L.L.) lines, immediately
remove cap (2) and add purified water (e.g. commercially
available replenishment water for a battery) to U.L. line.
3. After adding the purified water, tighten cap (2) securely.

REMARK
If the purified water is added to above UPPER LEVEL (U.L.) line, remove the fluid by using a syringe to lower
the level to UPPER LEVEL (U.L.) line. Neutralize the removed electrolyte with baking soda (sodium bicarbon-
ate), then flush it away with a large amount of water. If necessary, consult your Komatsu distributor or a battery
manufacturer.

METHOD FOR CHECKING ELECTROLYTE LEVEL WHEN IT IS IMPOSSIBLE TO

CHECK FROM SIDE OF BATTERY
If it is impossible to check the electrolyte level from the side of the battery, or there is no UPPER LEVEL line on
the side of the battery, check as follows.
1. Remove cap (2) at the top of the battery and check the
electrolyte level through electrolyte filler port (3).

2. If the electrolyte does not reach the sleeve (4), always add
the purified water (e.g. commercially available replenish-
ment water for a battery) so that the level reaches the bot-
tom of the sleeve (UPPER LEVEL line).
(A) Correct level: Electrolyte level is up to bottom of
sleeve, so surface tension causes electrolyte surface to
bulge and pole plate appears to be warped.
(B) Low level: Electrolyte level does not reach the bottom
of sleeve, so pole plate appears straight and not to be
warped.

METHOD FOR CHECKING ELECTROLYTE LEVEL ON INDICATOR ETC

If it is possible to use an indicator to check the electrolyte level, follow the instructions given.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR CHECKING AND ADJUSTING AIR CONDITIONER COMPRESSOR

BELT TENSION
The followings are the periodic maintenance items for the air conditioner. Perform inspection and maintenance
to use the air conditioner effectively.

METHOD FOR CHECKING AIR CONDITIONER COMPRESSOR BELT

1. Open cover (1).

2. Open the engine food and remove guard (2).

3. Press the center between crankshaft pulley (A) and com-

pressor pulley (B) with a finger (approximately 58.8 N 
{6.0 kg} ).
If deflection (C) is 14 to 16 mm {0.55 to 0.61 in} , the belt
tension is normal.
If the deflection is out of the standard, adjust it to the
standard value.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR ADJUSTING AIR CONDITIONER COMPRESSOR BELT

1. Loosen bolt (3) and nut (4).
2. Rotate nut (5) clockwise to move compressor (6).

3. Press the center between crankshaft pulley (A) and com-

pressor pulley (B) with a finger (approximately 58.8 N 
{6.0 kg} ).
If deflection (C) is 14 to 16 mm {0.55 to 0.61 in} , the belt
tension is the standard.
If the deflection is out of the standard, adjust it to the
standard value by repeating steps 2 and 3.
4. When the position of the compressor is determined, tight-
en nut (4) and bolt (3),and hold it in position.
5. Check each pulley for damage, wear of the V-groove, and
the wear of the V-belt. In particular, be sure to check that the V-belt is not touching the bottom of the V-
groove.
6. Replace the belt with a new one if the belt is stretched and has no allowance for adjustment, or has slipping
sound or squeak because of cuts or cracks of the belt.
NOTICE
When the new V-belt is installed, readjust it after operating for 1 hour.

METHOD FOR CHECKING LOOSENESS AND TIGHTENING CONNECTING BOLT

BETWEEN CENTER FRAME AND TRACK FRAME
NOTICE
If the machine is used with loose bolts connecting the center frame and track frame, the bolts will break.
If any looseness of connecting bolt is found, retighten it.
1. Check for looseness of the bolts (1) connecting the center
frame and track frame.
2. If any looseness of the bolt is found, tighten it.
Tightening torque: 1715 ± 195 Nm {175 ± 20 kgm, 1270 ±
145 lbft}

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR LUBRICATING SWING CIRCLE

Items to be prepared
Grease pump
1. Lower the work equipment to the ground.

2. By using a grease pump, apply grease to the grease fit-

tings marked by arrows (2 places).
3. After greasing, wipe off any old grease that is pushed out.

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MAINTENANCE PROCEDURE MAINTENANCE

EVERY 500 HOURS MAINTENANCE

Maintenance for every 50 and 250 hours should be performed at the same time.

METHOD FOR LUBRICATING

NOTICE
• If any unusual noise is generated from any greasing point, perform greasing regardless of the
greasing interval.
• Perform greasing every 10 hours for the first 50 hours of operation on a new machine.
• After the machine is subjected to digging work in the water, be sure to grease the wet pins.
• When performing heavy-duty operations, such as hydraulic breaker operations, perform the greas-
ing every 100 hours.
1. Set the work equipment on the level and firm ground in the
maintenance posture as shown in the figure, then lower it
to the ground and stop the engine.

2. By using a grease pump, pump in grease through the grease fittings shown by arrows.
(1) Boom cylinder rod pin (2 places)
(2) Arm cylinder foot pin (1 place)

(3) Boom and arm connection pin (1 place)

(4) Arm cylinder rod end (1 place)
(5) Bucket cylinder foot pin (1 place)

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MAINTENANCE MAINTENANCE PROCEDURE

(6) Boom cylinder foot pin (2 places)

(7) Boom foot pin (2 places)

3. After greasing, wipe off any old grease that is pushed out.

METHOD FOR CHANGING OIL IN ENGINE OIL PAN, REPLACING ENGINE OIL
FILTER CARTRIDGE
k WARNING
Immediately after the engine is stopped, its parts and oil are still very hot, and may cause burn injury.
Accordingly, wait until they have cooled down before starting the work.

Refill capacity of oil pan: 37 ℓ {9.78 U.S.Gal} 

Items to be prepared
• Container to receive drained oil
• Filter wrench
1. Remove cover (1) under the machine and put a container
under drain valve (P) to receive the drained oil.
2. To prevent getting oil on yourself, lower the lever of drain
valve (P) slowly, drain the oil, then raise the lever to close
the valve.

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MAINTENANCE PROCEDURE MAINTENANCE

3. Open the engine hood.

4. Turn filter cartridge (2) counterclockwise by using the filter
wrench, and remove it.
5. Clean the filter holder, fill the new filter cartridge with clean
engine oil, coat the thread and packing surface of the new
filter cartridge with clean engine oil (or thinly apply the
grease), then install it to the filter holder.
REMARK
Check that there is no old packing stuck to filter holder (2).
If there is any old packing stuck to it, it will cause leakage
of oil.
6. When installing, tighten until the packing surface contacts the seal surface of filter holder (2), then tighten it
further 3/4 to 1 turn.
7. After replacing the filter cartridge, open the engine hood
and fill with engine oil through oil filler port (F) to the mid-
point between H and L marks on dipstick (G).
8. Run the engine at idle for a time, then stop the engine and
check that the oil level is between H and L marks on the
dipstick. For details, see “METHOD FOR CHECKING OIL
LEVEL IN ENGINE OIL PAN, ADDING OIL (3-157)”.
9. Install cover (1).

REMARK
When the ambient temperature is low, water or emulsified matter may stick to the dipstick, oil filler cap, etc. or
the drained oil may be milky white because of water vapor in the blowby gas. However, if the coolant level is
normal, it is not a problem.
There is no problem even if the emulsified matter cannot be removed completely after changing oil.

METHOD FOR REPLACING FUEL PREFILTER CARTRIDGE

k WARNING
• After the engine stops, all parts are still very hot, so do not replace the filter immediately. Wait until
all of the parts to cool down before starting the work.
• While the engine is running, high-pressure is generated in the engine fuel piping.
When replacing the filter, wait for at least 30 seconds after stopping the engine to let the internal
pressure go down before replacing the filter.
• Do not bring any open flame close.

NOTICE
• Komatsu genuine fuel filter cartridges use a special filter that has highly efficient filtering ability.
When replacing parts, Komatsu recommends using Komatsu genuine parts.
• The common rail fuel injection system used on this machine consists of more precise parts than
those in the conventional injection pump and nozzles. If any cartridge other than a Komatsu genu-
ine filter cartridge is used, dust or dirt may get in and cause problems with the injection system.
Never use a substitute.
• When performing inspection and maintenance of the fuel system, be careful not to let any dirt or
dust get in, more than ever before. If dust sticks to the fuel system, wash it off thoroughly with fuel.
Items to be prepared
• Container to receive drained oil
• Filter wrench

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MAINTENANCE MAINTENANCE PROCEDURE

1. Turn valve (1) at the bottom of the fuel tank to CLOSE po-
sition (S).
2. Open the engine hood.

3. Place a container under fuel prefilter cartridge (2) to re-

ceive the fuel.
4. Loosen drain valve (3) and drain water and sediments
from transparent cup (4), and also drain all the fuel from fil-
ter cartridge (4).
5. Remove drain hose.

6. Turn filter cartridge (2) counterclockwise by using the filter

wrench, and remove it.
7. Make sure that drain valve (3), which is provided in the
lower part of transparent cup (4) of the new filter cartridge,
is firmly tightened.
Tightening torque: 2.5 to 3.4 Nm {0.25 to 0.35 kgm, 1.81 to
2.53 lbft}

8. Clean the filter head, fill the new filter cartridge with clean fuel, thinly apply oil to the packing surface, then
install it to the filter head.
NOTICE
• When filling the filter cartridge with fuel, do not re-
move cap (B). Always fill with fuel from small
holes (A) (8 places) on the dirty side.
• After filling with fuel, remove cap (B) and install
the fuel filter.
• Always fill with clean fuel. Be careful not to let any
dirt or dust get into the fuel. In particular, center
portion is the clean side, so do not remove cap (B)
when filling with fuel. Be careful not to let dirt or
dust get into the center portion on the clean side.
9. When installing the cartridge, tighten it until the packing surface contacts the sealing surface of the filter
head, then tighten it 1/2 to 3/4 turn.
REMARK
If the filter cartridge is fastened too much, the packing will be damaged and this leads to leakage of fuel. If
the filter cartridge is too loose, fuel will also leak from the packing. Therefore, be sure to observe the fasten-
ing angle.
When tightening with a filter wrench, be extremely careful not to dent or damage the filter.
10. Install drain hose.

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MAINTENANCE PROCEDURE MAINTENANCE

11. Turn valve (1) at the bottom of the fuel tank to OPEN position (O).
12. After replacing the filter cartridge, start the engine and run it at low idle for 10 minutes.
13. Check for leakage of oil from the filter seal surface and transparent cup mounting face.
If the leakage is noticed, check the filter cartridge for its tightening condition.
If there is still fuel leakage, repeat steps 1 to 6 and remove the filter cartridge. If any damage or pinched foreign
material on the packing surface is found, replace it with a new cartridge, and repeat steps 7 to 12 to install it.

METHOD FOR CHECKING SWING PINION GREASE LEVEL, ADD GREASE

Items to be prepared
Scale
1. Swing 3 times each to the right and left, and stop the machine.
2. Remove bolts (1) (2 pieces) on the top of the revolving
frame, and remove cover (2).

3. Insert ruler (3) into the grease through inspection and ad-
justment hole (A). Check that the height of grease (S) in
the area where the pinion passes is at least 25 mm {1 in} .
Add the grease if the grease amount (S) is less than
25 mm {1 in} .
4. Check that the grease is not milky white.
Total amount of grease: 33 ℓ {8.7 U.S.Gal}  (29.7 kg 
{65.5 lb} )
If the grease is milky white, it needs to be replaced. Ask
your Komatsu distributor to replace it.
5. Install cover (2) with bolt (1).

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR CHECKING AND CLEANING RADIATOR FINS, OIL COOLER FINS,
AFTERCOOLER FINS, AND AIR CONDITIONER CONDENSER FINS
k WARNING
If compressed air, high-pressure water, or steam hits your body directly or dirt is scattered by the com-
pressed air, high-pressure water, or steam, there is a danger of personal injury. Always wear protective
equipment such as protective eyeglasses and dust mask.

NOTICE
When using compressed air for cleaning, blow it keeping some distance to avoid damaging the fins.
Damage on the fins can cause water leakage and overheating. In a dusty job site, check the fins every
day, regardless of the maintenance interval.
1. Open cover (1).

2. Loosen screw (2) and pull up net (3).

3. Clean net (3) that you pulled up.

4. Remove bolts (4) (6 places) and move bracket (5) to make

clearance between radiator fin (6) and oil cooler fin (7).

5. Check the front and rear sides of radiator fins (6), oil cooler
fins (7), aftercooler fins (8), and condenser fins (9). If there
is any mud, dirt, leaves, etc. stuck to the fins, blow it off
with compressed air.

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MAINTENANCE PROCEDURE MAINTENANCE

NOTICE
Steam or water may be used instead of the compressed air. However, when performing powerful
steam cleaning (high-pressure machine wash) of the heat exchange equipment (radiator, oil cooler,
aftercooler, fuel cooler, air conditioner condenser), maintain sufficient distance from the machine
when performing the work. If steam cleaning (high-pressure machine wash) is performed at close
distance, there is a danger that the internal fins of the heat exchange equipment may be deformed,
and this will cause early clogging and breakage of the equipment.
6. Visually check the rubber hose connected to the heat exchange equipment. Check the hose clamp for
looseness as well.
If the rubber hose is cracked or become fragile, ask your Komatsu distributor for replacement.
If the hose clamp is loose, tighten it.
7. Remove undercover (10) and blow out the mud, dirt, and
leaves to the outside.
8. Push in cleaned net (3) back to the original place and in-
stall it with screw (2).
9. Install bracket (5) with bolt (4).
10. Install cover (1) and undercover (10).

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR CLEANING AIR CONDITIONER FRESH/RECIRC FILTERS

k WARNING
When using compressed air, there is a danger that dirt may scatter and cause personal injury. Always
wear protective equipment such as protective eyeglasses and dust mask.

NOTICE
The cleaning interval of 500 hours is a rough standard. Clean at shorter intervals in dusty jobsites.
REMARK
If the element becomes clogged, the air flow will be reduced, and there will be a rumbling sound from the air
conditioner unit.

METHOD FOR CLEANING RECIRCULATION AIR FILTER

1. Remove wing bolts (1) from the inspection window at the
bottom rear left inside the operator's cab.
2. Take out the recirculation air filter.
3. Clean the filter with compressed air.
If there is oil on the filter, or if the filter is extremely dirty,
wash it in a neutral detergent. After rinsing it in water, dry it
thoroughly before using it again.
Replace the filter with a new one every year. If the clog-
ging of the filter cannot be removed by blowing with air or
washing in water, replace the filter immediately.
REMARK
• The recirculation air filter must be installed in the correct direction.
• Install the filter so that protrusion (A) of filter (2) matches the groove of holder (3).
4. Install the recirculation air filter.

METHOD FOR CLEANING FRESH AIR FILTER

1. Unlock cover (4) at the rear left of the operator's cab with the starting switch key.
2. While holding cover (4) open, remove filter (5) inside it.

REMARK
• When removing, insert your finger into dent (D) of duct
(6) and pull it toward you.
If you grasp the filter with excessive force, it may be
deformed or damaged.
• If the filter is damaged or deformed, replace it with
new one.

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MAINTENANCE PROCEDURE MAINTENANCE

3. Clean the filter (5) with compressed air.

Set the compressed air pressure below 0.49 MPa
{5 kg/cm2,71 PSI} and blow it in the arrow direction.
If there is oil on the filter, or if the filter is extremely dirty,
wash it in a neutral detergent. After rinsing it in water, dry it
thoroughly before using it again.
Replace the filter with a new one every year. If the clog-
ging of the filter cannot be removed by blowing with air or
washing in water, replace the filter immediately.
If the filter is damaged or deformed, replace it with new
one.
4. After cleaning, return filter (5).
REMARK
• The fresh air filter must be installed facing it in the cor-
rect direction.
• When installing, insert long end (L) of filter (5) into
duct (6) first. If short end (S) is inserted first, filter (5)
will get stuck with protrusion (B) of the sheet metal
• Keep the filter away from protrusion (B) of the sheet
metal and insert it from the top first.
If the insertion is not enough or the filter is forcibly in-
serted from bottom, it may be deformed or broken.
After inserting it, pull it to the inside of protrusion (C) of
duct (6).
5. Close the cover (4) and lock with the starting switch key.
Do not forget to remove the starting switch key after lock-
ing.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR CHECKING OIL LEVEL IN SWING MACHINERY CASE, ADDING

OIL
k WARNING
Immediately after the engine is stopped, its parts and oil are still very hot, and may cause burn injury.
Accordingly, wait until they have cooled down before starting the work.

1. Open the cover.

2. Remove dipstick (G) and wipe off oil on it with a cloth.
3. Insert dipstick (G) fully into the guide.

4. Pull out dipstick (G) and check that the oil level is between
the (H) and (L) marks on the dipstick.
5. If the oil does not reach the (L) mark on dipstick (G), add
oil through the hole for the dipstick.
When adding oil, remove air bleeding plug (1).

6. If the oil level is above line (H) of dipstick (G), loosen drain
valve (P) to drain the excessive oil.
When draining the oil, take hose (2) out of inspection hole
(B) and place an oil container under hose (2), then “open”
the drain valve.
7. After checking oil level or adding oil, insert dipstick (G) into
the hole and install air bleeding plug (1).

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR CHECKING OIL LEVEL IN FINAL DRIVE CASE, ADDING OIL
k WARNING
• Immediately after the engine is stopped, its parts and oil are still very hot and may cause burn in-
jury. Accordingly, wait until they have cooled down before starting the work.
• If there is remaining pressure inside the case, the oil or plug may jump out. Loosen the plug slowly
to release the pressure.
• Do not stand in front of the plug when you loosen the plug.

Items to be prepared
Handle
1. Set the TOP mark at the top with the line running on TOP
mark and plug (P) perpendicular to the ground surface.
2. Remove plug (F) by using the handle.
When the oil level reaches a point 10 mm {0.4 in}  below
the bottom of the plug hole, the oil level is appropriate.
If the oil level is low, check it again according to the follow-
ing procedure.
1) Install plug (F).
2) Operate the travel lever to move the machine forward
or reverse and rotate the sprocket by 1 turn.
3) Check in the procedure of 2.
3. If the oil is insufficient, add oil through plug (F) hole.
Add oil until oil overflows from the hole of plug (F).
4. After the inspection, install plug (F).
Tightening torque of plugs (P) and (F): 68.6 ± 9.8 Nm {7 ±
1 kgm, 51 ± 7 lbft}
REMARK
Plug (F) is installed at 2 places. Add oil through the one
with which it is easier to add oil and through which no in-
ternal gears are seen.

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MAINTENANCE MAINTENANCE PROCEDURE

EVERY 1000 HOURS MAINTENANCE

Maintenance for every 50, 250 and 500 hours should be performed at the same time.

METHOD FOR REPLACING HYDRAULIC OIL FILTER ELEMENT

k WARNING
• Immediately after the engine is stopped, its parts and oil are still very hot and may cause burn in-
jury. Accordingly, wait until they have cooled down before starting the work.
• When removing the oil filler cap, the oil may spout out. Turn it slowly to release the internal pres-
sure, then remove it.

NOTICE
If the machine is equipped with a hydraulic breaker, the hydraulic oil deteriorates faster than in the nor-
mal bucket digging operation. Accordingly, perform maintenance referring to “MAINTENANCE INTER-
VAL FOR HYDRAULIC BREAKER (4-15)”.
Items to be prepared
Container to receive drained oil
1. Park the machine on a level and firm ground, lower the
work equipment to the ground in the posture shown in the
figure, and stop the engine.

2. Remove the cap for oil filler (F), and release the internal
pressure.

3. Loosen the bolts (4 pieces) to remove cover (1).

The cover may be jumped out by spring (2). While pressing down the cover, remove the bolts.
REMARK
If cover (1) is left approximately 5 minutes with the mount-
ing bolts loosened, the internal pressure of the case is re-
leased and the oil in the element is drained, and accord-
ingly less oil drips when the element is removed.
4. After removing spring (2), valve (3) and strainer (4), take
out element (5).
5. Check the bottom of the filter case for dirt or other materi-
al, and remove any if found.
Take extreme care that the dirt does not fall into the hy-
draulic tank.

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MAINTENANCE PROCEDURE MAINTENANCE

6. Clean the removed parts by using cleaning oil.

7. Install the new element in the place where old element (5) was installed.
8. Place strainer (4), valve (3) and spring (2) onto the element.
9. Set cover (1) in position, press it down by hand, and install the cover with the mounting bolts.
10. Install the oil filler cap.
For details, see“METHOD FOR INSTALLING HYDRAULIC TANK OIL FILLER CAP (3-155)”.
11. Start the engine and run it at low idle for 10 minutes to bleed air. For details, see “METHOD FOR START-
ING ENGINE (3-183)”.
12. Stop the engine.
REMARK
Operate the machine after halting for more than 5 minutes. This will remove the air bubbles in the oil inside
the tank.
13. Check that there is no leakage of oil and wipe off any oil that is spilled.

METHOD FOR CHANGE OIL IN SWING MACHINERY CASE

k WARNING
Immediately after the engine is stopped, its parts and oil are still very hot, and may cause burn injury.
Accordingly, wait until they have cooled down before starting the work.

Refill capacity: 20 ℓ {5.3 U.S.Gal} 

Items to be prepared
Container to receive drained oil
1. Remove cover (A) of the inspection hole.
(Only demolition specification machines)
2. Place a container under drain plug (P) on the underside of
the machine to receive the oil.

3. Loosen drain valve (P) under the machine, drain the oil,
then tighten the drain valve again.
When draining the oil, take hose (2) out of inspection hole
(B), then open the drain valve.

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MAINTENANCE MAINTENANCE PROCEDURE

4. Remove dipstick (G) and air bleeding plug (1).

5. Add oil through the pipe for dipstick (G) by the refill capaci-
ty.
6. Check the oil level. For the procedure, see “METHOD FOR
CHECKING OIL LEVEL IN SWING MACHINERY CASE,
ADDING OIL (4-63)”.
7. Install air bleeding plug (1).

METHOD FOR CHECKING AND ADDING OIL IN DAMPER CASE

k WARNING
Immediately after the engine is stopped, its parts and oil are still very hot, and may cause burn injury.
Accordingly, wait until they have cooled down before starting the work.

NOTICE
Park the machine on flat ground and stop the engine. When more than 30 minutes elapse after stopping
the engine, check the oil level.
1. Open the door on the left side of the machine.
2. Remove plug (P).
If the oil is insufficient, add it according to the following pro-
cedure.

1) Remove cap (F).

2) Add oil through oil filler port until it reaches to the low-
er edge of the hole of plug (P).
NOTICE
If excess oil is supplied, drain it to the specified
amount. It will cause overheat.
If the oil level is near the lower edge of the hole of plug (P),
the oil amount is proper.
3. Install plug (P) and cap (F).
4. Close the door.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR REPLACING FUEL MAIN FILTER CARTRIDGE

k WARNING
• After the engine stops, all parts are still very hot, so do not replace the filter immediately. Wait until
all of parts cool down before starting the work.
• High pressure is generated inside the engine fuel piping system when the engine is running.
When replacing the filter, wait for at least 30 seconds after stopping the engine to let the internal
pressure go down before replacing the filter.
• Do not bring any open flame close.
• When opening the air bleeding plug of the fuel filter head, take care. There may be remaining pres-
sure and fuel may spout out.

NOTICE
• Komatsu genuine fuel filter cartridges use a special filter that has highly efficient filtering ability.
When replacing parts, Komatsu recommends using Komatsu genuine parts.
• The common rail fuel injection system used on this machine consists of more precise parts than
those in the conventional injection pump and nozzles. If any cartridge other than a Komatsu genu-
ine filter cartridge is used, dust or dirt may get in and cause problems with the injection system.
Never use a substitute.
• When performing inspection and maintenance of the fuel system, be careful not to let any dirt or
dust get in, more than ever before. If dust sticks to the fuel system, wash it off thoroughly with fuel.
Items to be prepared
• Container to receive drained fuel
• Filter wrench
1. Turn valve (1) at the bottom of the fuel tank to “CLOSE”
position (S).
2. Open the engine hood.
3. Place a container under the filter cartridge (2) to receive
the fuel.

4. Turn filter cartridge (2) counterclockwise by using the filter

wrench, and remove it.
After removing the filter cartridge, fuel drops fall down from
the filter head.
In order to prevent flow out of the fuel, be sure not to leave
the machine without the filter cartridge.

5. Clean the filter head. Thinly apply oil to the packing of the new filter cartridge and install the cartridge to the
filter head.

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MAINTENANCE MAINTENANCE PROCEDURE

NOTICE
• Do not fill the new filter cartridge with fuel.
• Remove cap (B) at center and install the filter car-
tridge.
6. When installing the cartridge, tighten it until the packing
surface contacts the sealing surface of the filter head, then
tighten it 3/4 of a turn.
If the filter cartridge is fastened too much, the packing will
be damaged and this leads to leakage of fuel. If the filter
cartridge is too loose, fuel will also leak from the packing.
Therefore, be sure to observe the tightening angle.
When tightening with a filter wrench, be extremely careful not to dent or damage the filter.
7. Turn valve (1) at the bottom of the fuel tank to “OPEN” po-
sition (O).

8. After completing the replacement of filter cartridge (2),

bleed air from the fuel line.
For the procedure to bleed air, see“PROCEDURES FOR
BLEEDING AIR FROM FUEL CIRCUIT (3-271)”

METHOD FOR STARTING ENGINE USING FUEL FEED PUMP

1. Move the switch for fuel feed pump (3) to ON position.
2. Start the engine while the fuel feed pump is in operation.
If the engine does not start, repeat steps 1 and 2.
Keep away from the engine while it is being started and
running.
3. After the engine starts, run it for approximately 5 minutes
to bleed all air from the fuel circuit.
4. After approximately 5 minutes, stop the engine. Then, start
the engine as usual.

METHOD FOR CHECKING ALL TIGHTENING POINTS OF ENGINE INTAKE PIPE

CLAMPS
Ask your Komatsu distributor for checking the tightening of the clamps between the air cleaner - turbocharger -
aftercooler - engine.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR CHECKING AND RELEASING NITROGEN GAS CHARGE PRES-

SURE IN ACCUMULATOR (FOR BREAKER)
(if equipped)
A special tool is needed for checking and charging of nitrogen gas. Ask your Komatsu distributor to perform this
work.

METHOD FOR REPLACING HYDRAULIC TANK BREATHER ELEMENT

k WARNING
• Immediately after the engine is stopped, its parts and oil are still very hot and may cause burn in-
jury. Accordingly, wait until they have cooled down before starting the work.
• When removing the oil filler cap, the oil may spout out. Turn it slowly to release the internal pres-
sure, then remove it.

1. Remove nut (2) of breather assembly (1) at the top of the

hydraulic tank, then remove cover (3).

2. Replace filter element (4) with a new one.

3. Install cover (3) and nut (2).
In order not to damage the threaded portion of nut, tighten
nut (2) by hand until it is seated, then tighten it 15 to 30° by
using a tool.
NOTICE
If breather assembly (1) is removed for replacement,
apply a tool to bolt (5) and tighten it.
Tightening torque: 68 to 78 Nm{6.9 to 8.0 kgm,50 to
58 lbft}

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR REPLACING DEF TANK BREATHER ELEMENT

k WARNING
Do not replace the element immediately after engine is stopped.

NOTICE
• Komatsu recommends using Komatsu genuine parts for replacement parts.
• If the machine is operated without DEF tank breather element attached, or with the element other
than Komatsu genuine parts, foreign materials may enter into DEF pump and DEF injector which
will cause failure of the machine. Never operate the machine without DEF tank breather element at-
tached, nor use the element other than Komatsu genuine parts.
• Do not flush DEF tank breather element. Flushing or regenerating of it will degrade the performance
of element, and will cause the breakage of DEF tank. Never reuse the DEF element.
• Always stop the engine and clean around DEF tank before replacing.
• After the engine is stopped, DEF system devices automatically purge DEF in DEF injector and DEF
pump and return it to DEF tank to prevent malfunction of the devices caused by freezing of DEF or
deposition of urea.
After the engine is stopped, the devices are operated for a few minutes. Replace the element after
DEF system devices stop.
• Improper assembly of DEF tank breather element may cause leakage of DEF. Replace the element in
the correct procedure.
1. Open DEF tank cover at the right of the machine upward.

2. Remove nut (2) of breather assembly (1) at the top of DEF

tank, then remove cover (3).
3. Replace breather (4) with a new one.
4. Install cover (3) and nut (2).
In order not to damage the threaded portion of nut, tighten
nut (2) by hand until it is seated, then tighten it 15 to 25° by
using a tool.
NOTICE
If breather assembly (1) is removed for replacement,
apply a tool to bolt (5) and tighten it.
Tightening torque: 6.5 to 8.5 Nm{0.66 to 0.87 kgm,4.8
to 6.3 lbft}
5. Close DEF tank cover at the right of the machine.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR CHECKING ALTERNATOR BELT TENSION AND REPLACING AL-

TERNATOR BELT
Special tools are required for inspection and replacement of the alternator belt. Ask your Komatsu distributors
for inspection and replacement.
REMARK
As the auto alternator belt tensioner is installed, no belt tension adjustment is required.

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MAINTENANCE MAINTENANCE PROCEDURE

EVERY 2000 HOURS MAINTENANCE

Maintenance for every 50, 250, 500 and 1000 hours service should be performed at the same time.

METHOD FOR CHANGING OIL IN FINAL DRIVE CASE

k WARNING
• Immediately after the engine is stopped, its parts and oil are still very hot and may cause burn in-
jury. Accordingly, wait until they have cooled down before starting the work.
• If there is remaining pressure inside the case, the oil or plug may jump out. Loosen the plug slowly
to release the pressure.
• Do not stand in front of the plug when you loosen the plug.

Refill capacity (each of right and left): 11 ℓ {2.9 U.S.Gal} 

Items to be prepared
• Container to receive drained oil
• Handle
1. Set the TOP mark at the top with the line running on TOP
mark and plug (P) perpendicular to the ground surface.
2. Place the oil container to receive oil under plug (P).
3. Remove plugs (P) and (F) by using the handle, and drain
oil.
Check O-rings attached to the plugs for damage. If neces-
sary, replace them with new ones.
4. Tighten plug (P).
5. Refill oil through plug (F) hole.
Plug (F) is installed at 2 places. Add oil through the one
with which it is easier to add oil and through which no in-
ternal gears are seen.
6. When oil begins to overflow from the plug (F) hole, install
plug (F).
Tightening torque of plugs (P) and (F): 68.6 ± 9.8 Nm {7 ±
1 kgm, 51 ± 7 lbft}

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR CLEANING HYDRAULIC TANK STRAINER

k WARNING
• Immediately after the engine is stopped, its parts and oil are still very hot and may cause burn in-
jury. Accordingly, wait until they have cooled down before starting the work.
• When removing the oil filler cap, the oil may spout out. Turn it slowly to release the internal pres-
sure, then remove it.

1. Remove the cap for oil filler (F), and release the internal
pressure.

2. Remove the bolts (4 pieces), and remove cover (1). The

cover (1) may be jumped out by spring (2). While pressing
down the cover, remove the bolts.
3. Hold the top of rod (3), pull it up, and remove spring (2)
and strainer (4).
4. Remove any dirt stuck to strainer (4), then wash it in flush-
ing oil. If strainer (4) is damaged, replace it with a new
one.
5. Insert and set strainer (4) in projected portion (5) of the
tank.
6. Install cover (1) so that the protruding part at the bottom of cover (1) holds spring (2), then fasten the cover
with the bolts.
7. Install the cap of oil filler port.
For details, see“METHOD FOR INSTALLING HYDRAULIC TANK OIL FILLER CAP (3-155)”.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR CHECKING AND RELEASING NITROGEN GAS CHARGE PRES-

SURE IN ACCUMULATOR (FOR CONTROL CIRCUIT)
k WARNING
The accumulator is charged with high-pressure nitrogen gas, so improper operation may cause an ex-
plosion, which will lead to serious injury or death. For handling, always observe the following.
• The pressure in the hydraulic circuit cannot be completely removed. When removing the hydraulic
equipment, do not stand in the direction that the oil spurts out when performing the operation. In
addition, loosen the bolts slowly when performing the work.
• Do not disassemble it.
• Do not bring open flame close to it or do not dispose of it in fire.
• Do not perform drilling, welding or flame-cutting.
• Do not hit or roll it, or subject it to any impact.
• When disposing of it, the gas must be released. Ask your Komatsu distributor to have this work per-
formed.

NOTICE
If the nitrogen gas charge pressure in the accumulator is low and operations are continued, it becomes
impossible to release the remaining pressure inside the hydraulic circuit if a failure occurs on the ma-
chine.

FUNCTION OF ACCUMULATOR
The accumulator has function of storing the pressure of the control circuit in it. Even after the engine is stopped,
the control circuit can be operated as long as the accumulator functions normally, so the following actions are
possible.
• When the control lever is operated in the direction to lower the work equipment, the work equipment goes
down under its own weight.
• Release the pressure from the hydraulic circuit.
The accumulator is installed to the position shown in the figure.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR CHECKING ACCUMULATOR FUNCTION

k CAUTION
When performing the inspection, check first that there is no person or obstacle in the surrounding area.

Check the nitrogen gas charge pressure as follows.

1. Place the machine on a flat ground.
2. Hold the work equipment in the maximum reach posture
(arm fully OUT, bucket fully DUMP) at height (A) 1.5 m (4 ft
11 in) from the ground.
3. Perform the following procedure within 15 seconds.
After the engine stops, the accumulator pressure decreas-
es gradually. You can check only just after the engine
stops.

1) Keep the work equipment at the maximum reach pos-

ture, turn the starting switch to OFF position (A), and
stop the engine.

2) Turn the starting switch to ON position (B).

3) With the lock lever at FREE position (F), operate the

work equipment control levers fully in LOWER direc-
tion and check that the work equipment is lowered to
the ground.

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MAINTENANCE MAINTENANCE PROCEDURE

If the work equipment goes down under its own weight and
contacts the ground, the accumulator is normal.
If the work equipment does not go down or stops in midway,
the charged pressure of the gas in the accumulator for the hy-
draulic circuit has probably dropped. Ask your Komatsu distrib-
utor for inspection.

This completes the inspection. After completion of the inspection, set the lock lever to LOCK position and turn
the starting switch to OFF position.

METHOD FOR RELEASING PRESSURE IN ACCUMULATOR

1. Lower the work equipment to the ground.
Keep the crusher attachment jaws, etc. closed.
2. Set the lock lever to LOCK position (L).

If an attachment is installed, set the lock pin of the attach-

ment control pedal to position (c) where you can operate
the pedal.
3. Perform the following procedure within 15 seconds.
After the engine stops, the accumulator pressure decreas-
es gradually. You can check only just after the engine
stops.

1) Turn the starting switch to OFF position (A), and then

stop the engine.

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MAINTENANCE PROCEDURE MAINTENANCE

2) Turn the starting switch to ON position (B).

3) Set lock lever to FREE position (F), then operate the

work equipment control levers and the attachment
control pedal (if equipped) fully to forward, backward,
right, and left to release the pressure in the control cir-
cuit.

4. Set the lock lever to LOCK position, then turn the starting switch to OFF position.
If an attachment is installed, set the lock pin to position (a)
so that you cannot operate the attachment control pedal.

METHOD FOR CHECKING ALTERNATOR

Ask your Komatsu distributor to have the alternator checked.
If the engine is started frequently, have this inspection performed every 1000 hours.

METHOD FOR CHECKING AND ADJUSTING ENGINE VALVE CLEARANCE

Special tools are necessary for inspection and maintenance. Ask your Komatsu distributor to perform this work.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR REPLACING KCCV FILTER ELEMENT

k WARNING
After the engine has been operated, all of the parts are still very hot. Do not replace the filter element
immediately. Wait until all of parts cool down before starting the work.

NOTICE
• If the engine is operated without the filter element, the turbocharger and aftercooler become dirty
and their performance will lower and that can cause engine problems such as overrun caused by
suction of oil. Therefore, do not start the engine without the filter element.
• The filter element cannot be flushed. Flushing or regenerating of the filter element will degrade per-
formance of the filter. As a result, the turbocharger and aftercooler become dirty and the perform-
ance lowers or the crankcase pressure increases. Never reuse the filter element since it can cause
an engine failure.
• After the filter element is replaced, if KCCV is not assembled correctly, oil or blowby gas may leak.
Replace the filter element in the correct procedure.
Items to be prepared
• Container to receive drained oil
• Special wrench for KCCV
The KCCV ventilator is located in the positions shown in the
figure.

For the use of the special wrench, see the figure.

1. By using the special wrench, loosen ring (3) of KCCV ven-

tilator (1).

2. After ring (3) comes off, remove case (4) from body (2) and remove element (5).

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MAINTENANCE PROCEDURE MAINTENANCE

There may be oil accumulated or sticking in the case and

element. Take care not to spill the oil when replacing the
element.
REMARK
When the ambient temperature is low, water or emulsified
matter may stick to the inside of KCCV because of con-
densation of water vapor in the blowby gas. However, if
the coolant level is normal, it is not a problem.

3. Remove used O-ring (6) sticking to case (4) and install a new O-ring contained in the service kit.
Apply engine oil to the new O-ring.

4. While matching ◇ marks (7) of the new element with ◇

mark (8) of the body label, insert the element firmly into the
end of the body.

The element can be installed only when its claws (9) are
correctly inserted in grooves (10) of the filter body. Bases
(11) and (12) are oval. When inserting, take extreme care
so that those bases are matched with each other.

5. Align the position of ◇ mark (13) on the case with that of ◇

mark (8) of the filter body label, then install the case to the
filter body.

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MAINTENANCE MAINTENANCE PROCEDURE

The case can be installed only when its claws (14) are cor-
rectly inserted in grooves (10) of the filter body. When in-
serting, take extreme care so that protrusion (15) in the
case is joined together with rubber lip (16) of the element.

6. Fit ring (3) to the threaded part of the body and tighten it
with the hand firmly until it stops.

7. By using the special wrench, further tighten the ring 1/15 to

2/15 turns (1 to 2 ridges of the ring).
If the engine is operated with the ring tightened insufficient-
ly, oil and blowby gas may leak.

Check the KCCV hose for leakage, crack, and loose clamp, and replace it if necessary.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR REPLACING DEF FILTER

k WARNING
Immediately after the engine is stopped, the parts are still very hot. Do not replace the filter immediately.
Wait until all of parts cool down before starting the work.

NOTICE
• Komatsu recommends using Komatsu genuine parts for replacement parts.
• If the machine is operated without DEF filter attached, or with the filter other than Komatsu genuine
parts, foreign materials may enter into DEF pump and DEF injector which will cause failure of the
machine. Never operate the machine without DEF filter attached, nor use the filter other than Komat-
su genuine parts.
• DEF filter cannot be flushed. Flushing or regenerating of it will degrade the performance of filter,
and will cause the breakage of equipment. Never reuse the filter.
• Improper assembly of DEF filter may cause leakage of DEF. Replace the DEF filter in the correct pro-
cedure.
After the engine is stopped, DEF system devices automatically purge DEF in DEF injector and DEF pump and
return it to DEF tank to prevent malfunction of the devices caused by freezing of DEF or deposition of urea.
After the engine is stopped, the devices are operated for a few minutes. Before replacing the filter, clean around
the DEF pump first after DEF system devices stop.
Items to be prepared
• DEF filter removal tool
The DEF filter is located at the positions shown in the figure on
the right.

1. Remove filter cap (1) at the bottom of DEF pump, and re-
move element (2).

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MAINTENANCE MAINTENANCE PROCEDURE

2. Turn cap (4) of filter removal tool (3) and remove it.
3. Check the installation of spacer (5).

4. Insert filter removal tool (3) into the bottom of the DEF
pump and thrust in with hand.

5. Check that filter removal tool (3) is fully inserted to the end.
Insert the filter removal tool to the end where you cannot
thrust it in any further.

6. Turn filter removal tool (3) in reverse, and remove filter (6).
Filter (6) is removed and you can take it out together with
filter removal tool (3).
If filter (6) cannot be removed from DEF pump, grip filter
removal tool (3), pull it down, then it will be removed.

7. Slide filter (6) down, and remove spacer (5) from filter re-
moval tool (3).

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MAINTENANCE PROCEDURE MAINTENANCE

8. Pull filter (6) up while pushing in the tip of filter removal

tool (3), and remove it.
9. Return the removed spacer (5) to filter removal tool (3),
and keep them.
10. Insert a new filter and a new element into the bottom of
DEF pump, and lightly tighten them with hand.

11. Tighten filter cap (1).

Tightening torque: 20 to 25 Nm {2.0 to 2.5 kgm, 14.5 to
18.1 lbft}

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MAINTENANCE MAINTENANCE PROCEDURE

EVERY 4000 HOURS MAINTENANCE

Maintenance for every 50, 250, 500, 1000 and 2000 hours service should be performed at the same time.

REPLACE DEFINED LIFE PARTS

These parts change in material, wear, and deteriorate as they are aged.
Replace them every 2 years or every 4000 hours, whichever comes sooner.

DEFINED LIFE PARTS LIST

No. Parts for periodic replacement Replacement interval
1 Fuel system Fuel hose
Spill hose
2 Engine lubrication system Turbocharger lubrication hose
Engine oil filter hose
3 Work equipment hydraulic Main pump delivery hose
system Pump delivery hose
Pump branch hose
Main pump LS hose
Hydraulic drive fan hose (Intake fan)
Swing line hose Ask your Komatsu distributor
Main suction hose for replacement.
External work equipment hose
• Boom foot connection hose
• Boom cylinder hose
• Arm connection hose
• Arm cylinder hose
• Bucket cylinder hose
• Line hose for additional attachment
4 Others PPC accumulator
Accumulator for additional attachment

METHOD FOR CHECKING WATER PUMP

Check for leakage of water and oil around the water pump. If any problem is found, ask your Komatsu distributor
to perform disassembly, repair, or replacement.

METHOD FOR CHECKING STARTING MOTOR

Ask your Komatsu distributor to have the starting motor checked.
If the engine is started frequently, have this inspection performed every 1000 hours.

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MAINTENANCE PROCEDURE MAINTENANCE

METHOD FOR REPLACING ACCUMULATOR (FOR CONTROL CIRCUIT)

k WARNING
The accumulator is charged with high-pressure nitrogen gas, so improper operation may cause an ex-
plosion, which will lead to serious injury or death. When handling, always observe the following.
• The pressure in the hydraulic circuit cannot be completely removed. When removing the hydraulic
equipment, do not stand in the direction that the oil spurts out when performing the operation. In
addition, loosen the bolts slowly when performing the work.
• Do not disassemble it.
• Do not bring open flame close to it or do not dispose of it in fire.
• Do not perform drilling, welding or flame-cutting.
• Do not hit or roll it, or subject it to any impact.
• When disposing of it, the gas must be released. Ask your Komatsu distributor to have this work per-
formed.

NOTICE
If the nitrogen gas charge pressure in the accumulator is low and operations are continued, it becomes
impossible to release the remaining pressure inside the hydraulic circuit if a failure occurs on the ma-
chine.
Replace the accumulator every 2 years or every 4000 hours, whichever comes sooner. Ask your Komatsu dis-
tributor for replacement.
The accumulator is installed to the position shown in the figure.

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MAINTENANCE MAINTENANCE PROCEDURE

METHOD FOR CHECKING FOR LOOSENESS OF ENGINE HIGH-PRESSURE PIP-

ING CLAMP, HARDENING OF RUBBER

Check clamps (1) to (14) visually and with your fingers that there are no loose bolts or hardening of the rubber.
If there is any problem, the replacement must be performed. Ask your Komatsu distributor for replacement.

METHOD FOR CHECKING FOR MISSING FUEL SPRAY PREVENTION CAP,

HARDENING OF RUBBER

Check fuel spray prevention caps (1) to (11) and fuel spray prevention cover (12) visually or with a finger to see
if any of them has slipped off, or the rubber portion is hardened.
If there is any problem, the replacement must be performed. Ask your Komatsu distributor for replacement.

4-87
MAINTENANCE PROCEDURE MAINTENANCE

EVERY 4500 HOURS MAINTENANCE

Maintenance for every 50, 250 and 500 hours should be performed at the same time.

METHOD FOR CLEANING KDPF

Contact your Komatsu distributor for cleaning of the KDPF.

METHOD FOR CLEANING DEF TANK

Ask your Komatsu distributor for cleaning of the DEF tank.

METHOD FOR CLEANING FUEL DOSER

For cleaning the fuel doser, ask your Komatsu distributor.

CHECK FOR MISSING FUEL SPRAY PREVENTION CAP ON FUEL DOSER PIP-
ING, HARDENING OF RUBBER

Check fuel spray prevention caps (1) and (2) visually or with a finger to see if any of them has slipped off, or the
rubber portion is hardened.
If there is any problem, the replacement must be performed. Ask your Komatsu distributor for replacement.

4-88
MAINTENANCE MAINTENANCE PROCEDURE

EVERY 5000 HOURS MAINTENANCE

Maintenance for every 50, 250, 500 and 1000 hours service should be performed at the same time.

METHOD FOR CHANGING OIL IN HYDRAULIC TANK

k WARNING
• Immediately after the engine is stopped, its parts and oil are still very hot and may cause burn in-
jury. Accordingly, wait until they have cooled down before starting the work.
• When removing the oil filler cap, the oil may spout out. Turn it slowly to release the internal pres-
sure, then remove it carefully.

NOTICE
If the machine is equipped with a hydraulic breaker, the hydraulic oil deteriorates faster than in the nor-
mal bucket digging operation. Accordingly, perform maintenance referring to “MAINTENANCE INTER-
VAL FOR HYDRAULIC BREAKER (4-15)”.
Refill capacity: 248 ℓ {65.5 U.S.Gal} 
Items to be prepared
• Container to receive drained oil
• Socket wrench handle
1. Swing the upper structure so that drain plug (P) of the hy-
draulic tank and drain plug (A) at the bottom of the pump
suction tube are placed in between the right and left
tracks.
2. Retract the arm and bucket cylinder rods, then lower the
boom to lower the tooth to the ground.

3. Set the lock lever to LOCK (L) position and stop the en-
gine.

4. Remove the cap of oil filler port (F).

4-89
MAINTENANCE PROCEDURE MAINTENANCE

5. Remove undercovers (1) and (2).

6. Place the oil container under the drain plug under the ma-
chine.
When removing drain plugs (P) and (A), be careful not to
get oil on yourself.
Almost the same amount of oil can be drained from 2 pla-
ces, by removing plug (P) from the tank bottom first and
then plug (A) from the suction tube.
7. Remove drain plug (P) from the tank bottom to drain the
oil.
Check the installed O-ring for damage. Replace O-ring with a new one if necessary.
8. Remove drain plug (P) from the suction tube to drain the oil.
Check the installed O-ring for damage. Replace O-ring with a new one if necessary.
9. After draining the oil, tighten drain plugs (A) and (P).
Tightening: 58.8 to 78.5 Nm {6 to 8 kgm, 43.4 to 57.9 lbft}
10. Add the refill capacity of oil through oil filler port (F).
11. Check that the oil level is between H and L lines on sight gauge (G).
For applicable oils, see “USE OF FUEL, COOLANT AND LUBRICANTS TO ACCORDING TO AMBIENT
TEMPERATURE (7-7)”.
For the check of oil level and the installation procedure of the oil filler cap, see “METHOD FOR CHECKING
OIL LEVEL IN HYDRAULIC TANK, ADDING OIL (3-154)”.
12. Bleed air from the hydraulic circuit.
For the air bleeding procedure of hydraulic circuit, see “METHOD FOR BLEEDING AIR FROM HYDRAUL-
IC CIRCUIT (4-44)”.
13. Install undercovers (1) and (2).

4-90
MAINTENANCE MAINTENANCE PROCEDURE

EVERY 8000 HOURS MAINTENANCE

Maintenance for every 50, 250, 500, 1000, 2000 and 4000 hours service should be performed at the same time.

METHOD FOR REPLACING ENGINE HIGH-PRESSURE PIPING CLAMP

Special techniques and tools are required for this work.
Ask your Komatsu distributor for replacement of the engine high-pressure piping.

METHOD FOR REPLACING FUEL SPRAY PREVENTION CAP

Ask your Komatsu distributor for replacement of the fuel spray prevention caps.

4-91
MAINTENANCE PROCEDURE MAINTENANCE

EVERY 9000 HOURS MAINTENANCE

Maintenance for every 50, 250, 500, 1000 and 4500 hours service should be performed at the same time.

METHOD FOR REPLACING DEF HOSE

Ask your Komatsu distributor for replacement of the DEF hose.

METHOD FOR REPLACING FUEL SPRAY PREVENTION CAP ON FUEL DOSER

PIPING
Special techniques and tools are required for this work.
Ask your Komatsu distributor for replacement of the fuel spray prevention cap on fuel doser.

4-92
SPECIFICATIONS

5-1
SPECIFICATIONS SPECIFICATIONS

SPECIFICATIONS
SPECIFICATIONS: PC490LC-11
Item Unit PC490LC-11
Operating weight  kg {lb} 47420 {404561}
 m3
Bucket capacity 1.9 (2.5)
{cu/yd}
Engine model － KOMATSU SAA6D125E-6 diesel engine

Rated SAE J1995 (gross) kW {HP} / 270 {362} / 1900 {1900}

horse- ISO 9249 /SAE J1349 min-1
power {rpm} 268 {359} / 1900 {1900}
(net)
A Overall length  mm {ft in} 11930 {39' 2"}
B Overall height (work equipment)  mm {ft in} 3635 {11' 11"}
C Overall width  mm {ft in} 3440 {11' 3"}
D Shoe width  mm {ft in} 700 {2' 4"}
E Cab height  mm {ft in} 3360 {11' 0"}
F Tail swing radius  mm {ft in} 3645 {12' 0"}
G Overall length of track  mm {ft in} 5385 {17' 8"}
H Distance between tumbler centers  mm {ft in} 4350 {14' 3"}
I Height of handrail  mm {ft in} 3450 {11' 4"}
Min. ground clearance  mm {ft in} 570 {1' 10"}
 km/h
Travel speed (Lo/Mi/Hi) 3.0 / 4.2 / 5.5 {1.9 / 2.6 / 3.4}
{MPH}

min-1
Swing speed 9.1 {9.1}
{rpm}

5-2
SPECIFICATIONS SPECIFICATIONS

Working ranges Unit PC490LC-11

A Max. digging reach  mm (ft in) 12030 {39' 6"}
B Max. digging depth  mm (ft in) 7755 {25' 5"}
C Max. digging height  mm (ft in) 10980 {36' 0"}
D Max. vertical wall digging depth  mm (ft in) 6805 {22' 4"}
E Max. dumping height  mm (ft in) 7630 {25' 0"}
F Min. dumping height  mm (ft in) 2970 {9' 9"}
G Max. reach at ground level  mm (ft in) 11810 {38' 9"}

5-3
 ATTACHMENTS AND
OPTIONS

Please read and make sure that you understand the SAFETY section before
reading this section.

6-1
PRECAUTIONS FOR USING ATTACHMENT AND OPTIONS ATTACHMENTS AND OPTIONS

PRECAUTIONS FOR USING ATTACHMENT AND OPTIONS

k WARNING
Install only attachments or options authorized by Komatsu. Komatsu cannot accept any responsibility
for any not authorized by Komatsu. Any personal injury, failure, or property damage caused by the use
of unauthorized attachments or options will not be the responsibility of Komatsu.

When installing attachments or options to the machine, it is necessary to pay attention to safety. Observe the
following precautions strictly when selecting, installing or removing, or using attachments or options.

PRECAUTIONS WHEN SELECTING

Consult your Komatsu distributor before installing attachments or options to the machine. Depending on the
type of attachment or option, it may be necessary to install a front guard, overhead guard, or other safety struc-
ture to the machine. There may also be problems of the attachment or option hitting the operator's cab.

READ THE OPERATION AND MAINTENANCE MANUAL THOROUGHLY

Before installing or using any attachment or option, make sure that you thoroughly read and understand the in-
struction manuals for the machine and the attachment or option.
If you lose the instruction manual or it is damaged, obtain a new copy from the attachment manufacturer or your
Komatsu distributor.

PRECAUTIONS WHEN REMOVING AND INSTALLING

When removing or installing the attachment or option, observe the following precautions, and take care to en-
sure safety during the operation.
• Perform the removal and installation operation on a level and firm ground surface.
• When the operation is performed by 2 or more workers, choose the leader and follow his/her instructions.
• Use a crane when handling heavy objects (25 kg or more {55.1 lb or more} ).
(The crane must be operated by a qualified operator.)
• Never go under a load raised by the crane.
• Do not perform operations with the load kept raised by the crane. Always use a stand to prevent the load
from falling.
• When removing a heavy part, consider the machine balance after it is removed. To prevent the machine
from tipping over, set a support in position if necessary before removing the part.
• Before installing or after removing the attachment or option, set it in a stable condition to prevent it from
falling over.
• For details of the removal or installation operation, consult your Komatsu distributor.

PRECAUTIONS FOR USING

Keep the following precautions in your mind when long or heavy work equipment is installed. Before starting
operations, move the machine to a safe place and perform a test operation to make sure that you fully under-
stand the movement, center of gravity, and working range of the machine.
• Do not perform the swing operation if the machine is at an angle. If the swing is performed with the machine
at an angle, there is a danger that the machine may tip over.
• Always allow extra space to the position you want to stop swinging when performing the swing.
If long work equipment is installed, the working range becomes larger. So be more careful to maintain a
safe distance from the surroundings.
• If heavy work equipment is installed, pay attention to the following precautions.
• The swing overrun (the distance the work equipment moves before completely stopping after the swing
brake is applied) will be greater. It is dangerous if a lifted load hits any person or structure. Always
maintain a safe distance to the swing stop position when operating.

6-2
ATTACHMENTS AND OPTIONS PRECAUTIONS FOR USING ATTACHMENT AND OPTIONS

• The hydraulic drift of the work equipment (the amount of the work equipment moves down under its
own weight when it is stopped in a raised position) also becomes greater. Do not stop the work equip-
ment in air.
• Do not suddenly swing, lower, or stop the work equipment. It is dangerous that the machine may tip
over.
• Do not suddenly extend or retract the boom cylinder rod. The shocks may cause the machine to tip
over.

6-3
HANDLE BUCKET WITH HOOK ATTACHMENTS AND OPTIONS

HANDLE BUCKET WITH HOOK

When using the bucket with hook, check that there is no damage to the hook, stopper, or hook mount. If there is
any problem, ask your Komatsu distributor.

PRECAUTIONS FOR OPERATION

PRECAUTIONS FOR LIFTING OPERATIONS
If lifted load largely swings, it is dangerous. During lifting operations, reduce the engine speed and perform the
operation in L mode.
The wire or sling may come off the hook, depending on the
working posture. Pay sufficient attention to the hook angle so
that the sling does not come off.
Never drive the machine while lifting a load.
If the bucket with hook is turned 180 ° and used for operations,
it will hit the arm during the bucket DUMP operation. Be careful
when using it.
If you are planning to newly install a hook, ask your Komatsu
distributor for installation.

6-4
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT

HANDLE MACHINE READY FOR INSTALLATION OF AT-

TACHMENT
EXPLANATION OF COMPONENTS ON MACHINE EQUIPPED WITH AT-
TACHMENT

(1) Stop valve (4) Lock pin

(2) Selector valve (5) Additional filter for breaker
(3) Attachment control pedal (6) Accumulator

STOP VALVE
The stop valve stops the flow of the hydraulic oil.
(F) FREE
Hydraulic oil flows.
(L) LOCK
Hydraulic oil stops.
When removing or installing attachments, set this valve to
LOCK position.

6-5
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT ATTACHMENTS AND OPTIONS

SELECTOR VALVE
The selector valve switches the flow of the hydraulic oil.
It is automatically switched according to the selected working
mode. It is necessary to switch the working mode to match the
attachment that is installed. When changing the working mode,
see “METHOD FOR CHANGE-OVER AND CONNECT HY-
DRAULIC CIRCUIT FOR MACHINE READY FOR INSTALLA-
TION OF ATTACHMENT (6-9)”.
NOTICE
If a service circuit from the attachment manufacturer is
added, the return circuit may not switch automatically.

CONTROL PEDAL
k WARNING
If you perform operations with your foot on the pedal, the attachment may suddenly move if you de-
press the pedal by mistake, and this may lead to serious personal injury or death. Lock the pedal with
the lock pin when pedal operation is not necessary.

Control pedal is used to control the attachment.

When the front, center (neutral), and rear of the pedal are depressed, the movement of the attachment is as
follows.
Hydraulic breaker
Front of pedal (A)
Actuated
Center of pedal (N)
Stop
Rear of pedal (B)
Stop
REMARK
Regarding other attachments, discuss how the pedal and at-
tachment operate with the attachment manufacturer at the time
of installation before using it. Confirm how they operate before
starting use.

6-6
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT

LOCK PIN
NOTICE
Before changing the position of the lock pin, stop the engine.
If you depress the pedal to (D) side with lock pin at (c) position when using the breaker, it may cause
malfunction and breakage of breaker. Always put the lock pin at (b) position when using the breaker.
The lock pin locks the control pedal.
Position (a)
Lock
Position (b)
Only front of pedal can be operated to full travel position (rear
is locked)
Position (c)
Both front and rear of pedal can be operated to full travel posi-
tion
REMARK
Set the lock pin to (a) position except when using the attach-
ment.
When using the breaker, use the working mode selector switch
on the monitor switch portion to set the working mode to B
mode, and set the lock pin to position (b) when using the pedal.
When using the crusher, use the working mode selector switch
on the monitor switch portion to set the working mode to ATT
mode, and set the lock pin to position (c) when using the pedal.

ADDITIONAL FILTER FOR BREAKER

NOTICE
Always install an additional filter in the return circuit on machines equipped with a hydraulic breaker.
The additional filter for breaker prevents deterioration of the hy-
draulic oil when using a breaker.
REMARK
Oil flows only when B mode is selected on the monitor.

6-7
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT ATTACHMENTS AND OPTIONS

ACCUMULATOR
k WARNING
The accumulator is charged with high-pressure nitrogen gas, so mistaken operation may cause an ex-
plosion, which will lead to serious injury or death or damage. For handling, always observe the follow-
ing.
• The pressure in the hydraulic circuit cannot be completely removed. When removing the hydraulic
equipment, do not stand in the direction that the oil spurts out when performing the operation. In
addition, loosen the bolts slowly when performing the work.
• Do not disassemble it.
• Do not bring open flame close to it or do not dispose of it in fire.
• Do not perform drilling, welding or flame-cutting.
• Do not hit or roll it, or subject it to any impact.
• When disposing of it, the gas must be released. Ask your Komatsu distributor to have this work per-
formed.

NOTICE
To the machine equipped with a breaker you need to install an accumulator whose model number
matches to that of the breaker manufacturer to the breaker piping . If breaker operation is performed
without having an accumulator installed, the service life of the machine will be reduced. Contact your
Komatsu distributor for further information regarding the breaker.
This accumulator is installed to reduce the peak pressure in the
hydraulic circuit when the breaker is used. Do not touch it usu-
ally.
When inspecting the accumulator, see “METHOD FOR
CHECKING AND RELEASING NITROGEN GAS CHARGE
PRESSURE IN ACCUMULATOR (FOR BREAKER) (4-70)”.

6-8
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT

METHOD FOR CHANGE-OVER AND CONNECT HYDRAULIC CIRCUIT FOR

MACHINE READY FOR INSTALLATION OF ATTACHMENT
NOTICE
When a breaker is installed, it is necessary for the return circuit to return directly to the return filter. Do
not use it in the working mode other than B mode.
The standard set pressure for the safety valve of service valve may be necessary to adjust depending
on the attachment. For adjustment, ask your Komatsu distributor.

METHOD FOR CONNECTING HYDRAULIC CIRCUIT

When installing the attachment, connect the hydraulic circuit as follows.
1. Remove plug (1) (2 places on right and left sides) at the tip
of the stop valve piping.
Be careful not to lose or damage the removed parts.

2. Connect the attachment piping (2) provided by the attach-

ment manufacturer to the part from where the plug is re-
moved.
REMARK
Method of connection varies depending on the attachment
manufacturer because size of the fitting, added accumula-
tor, etc. are different. Consult your Komatsu distributor.

6-9
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT ATTACHMENTS AND OPTIONS

PEDAL OPERATION AND OIL FLOW OF MACHINE EQUIPPED WITH ATTACH-

MENT
The direction of operation of the pedal and the path of the oil flow is as shown in the figure.

• Depress the front side of pedal.

The oil flows into piping of the left side of the work equipment.
• Depress the rear side of pedal.
The oil flows into piping of the right side of the work equipment.
REMARK
When a breaker is installed, depress only the front side of pedal.

METHOD FOR SWITCHING HYDAULIC CIRCUIT

Depending on the type of attachment, set the working mode on the monitor as follows.
The hydraulic circuit and the set pressure of the safety valve in the service valve switch according to the select-
ed working mode.
Depending on the attachment, it is necessary to change the oil flow in the service circuit.
For setting of the flow, see “METHOD FOR OPERATING ATTACHMENT (6-15)”.

Switching method of breaker and general attachment

Install an optional attachment and set the working mode to B mode.
Hydraulic oil flowing through breaker circuit passes through additional filter for breaker. Relief valve is set to low
pressure. Maximum oil flow can be adjusted in user mode.
Set pressure of safety valve of service valve (when shipped from plant): 21.6 MPa {220 kg/cm2, 3130 PSI}
Breaker circuit (one-way circuit) is formed.

Crusher or other attachment with 2-way circuit

Install an optional attachment and set the working mode to ATT/P or ATT/E mode.

6-10
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT

Hydraulic oil flowing through crusher circuit does not pass through additional filter for breaker. Relief valve is set
to high pressure. Maximum oil flow can be adjusted in user mode.
Set pressure of safety valve of service valve (when shipped from plant): 24.5 MPa {250 kg/cm2, 3560 PSI}
Crusher circuit (2-way circuit) is formed.

METHOD FOR REMOVING AND INSTALLING ATTACHMENT

k WARNING
Lower the attachment to the ground and stop the engine.

METHOD FOR REMOVING ATTACHMENT

1. Turn the starting switch to ON (B) position.

2. Set the lock lever to FREE position (F).

3. Operate each work equipment control lever and attach-

ment control pedal fully to the front, rear, right, and left a
few times within 15 seconds to release the internal pres-
sure in the hydraulic circuit.

6-11
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT ATTACHMENTS AND OPTIONS

4. Loosen oil filler cap (F) slowly on the top of the hydraulic
tank to release the internal pressure in the hydraulic tank.
5. Check that the hydraulic oil temperature is low.

6. Turn the rotor of the stop valve installed to the piping for
the inlet port and the outlet port on the side face of the arm
to LOCK position (L).
7. Remove the hoses on the attachment side. Install the
plugs to outlets (2 places).
The plugs are used to prevent the attachment from making
incorrect operation caused by mixing in of foreign matter.
After the plugs are correctly installed, store the attach-
ment.

8. Pull out the mounting pins (2 places), remove the attach-

ment, then install the bucket.
For the installation procedure of the bucket, see “METHOD
FOR REPLACING AND INVERTING BUCKET (3-220)”.
9. Check oil level in hydraulic tank.
For details, see “METHOD FOR CHECKING OIL LEVEL
IN HYDRAULIC TANK, ADDING OIL (3-154)”.

METHOD FOR INSTALLING ATTACHMENT

1. Remove the bucket.
For the removal procedure of the bucket, see “METHOD FOR REPLACING AND INVERTING BUCKET
(3-220)”.
2. Place the attachment on a horizontal place, install pin (A)
and then pin (B) in this order to the arm.
3. Lower the attachment to the ground and stop the engine.

6-12
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT

4. Turn the starting switch to ON (B) position.

5. Set the lock lever to FREE position (F).

6. Operate each work equipment control lever and attach-

ment control pedal fully to the front, rear, right, and left a
few times within 15 seconds to release the internal pres-
sure in the hydraulic circuit.

7. Set the lock lever to LOCK position (L).

6-13
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT ATTACHMENTS AND OPTIONS

8. Loosen oil filler cap (F) slowly on the top of the hydraulic
tank to release the internal pressure in the hydraulic tank.
9. Check that the hydraulic oil temperature is low.
10. Remove the 2 plugs at the outlet and inlet.
Be careful not to get any dirt or mud on the hose fitting.
If an O-ring is damaged, replace it with a new one.
11. Connect the hose on the attachment side.
Check the direction of flow of the oil and be careful not to
make any mistake.
12. Rotate the rotor of the stop valve installed to the piping for
the inlet port and the outlet port on the side face of the arm
to FREE position (F).
13. Check the oil level in the hydraulic tank.
For details, see “METHOD FOR CHECKING OIL LEVEL
IN HYDRAULIC TANK, ADDING OIL (3-154)”.

6-14
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT

METHOD FOR OPERATING ATTACHMENT

k WARNING
If the travel pedals are operated when the engine speed is decreased by the auto-deceleration function,
the engine speed will suddenly increase. Be careful.
If you perform operations with your foot on the pedal, the attachment may suddenly move if you de-
press the pedal by mistake, and this may lead to serious personal injury or death. Do not rest your foot
on the pedal except when you need to operate the pedal.
When the attachment is not used, set the lock pin of the pedal to LOCK position to prevent the pedal
from being operated.

For the change of the flow setting for the breaker mode and attachment mode for the crusher, etc., see “MA-
CHINE SETTINGS (3-72)”.

METHOD FOR OPERATING BREAKER

NOTICE
When performing breaker operations, use the breaker mode. If the breaker is used without using the
breaker mode, the breaker may be damaged.
1. Set the working mode to B mode.
2. Set only the front part of the lock pin to FREE position (b).
3. Depress the front part of the pedal.

The breaker operates.

6-15
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT ATTACHMENTS AND OPTIONS

METHOD FOR OPERATING MACHINE WHEN WORKING MODE IS NOT IN

BREAKER MODE
Change the working mode and enter the breaker mode.
1. Press the working mode selector switch (1).
The screen changes to the working mode selection
screen.

2. Press the working mode selector switch (1) or press

switches F3 or F4 to select breaker mode B.
3. With breaker mode B highlighted in yellow, do one of the
following to enter the selection.
1) To keep working mode selector switch (1) pressed.
2) To press switch F6.
3) To leave as it is for 5 seconds.

If you enter the selection of the breaker mode, the confir-

mation message is displayed.

k WARNING
When a special attachment is installed, if the mode is switched to the breaker mode by mistake, it may
lead to serious danger, such as sudden drop of the work equipment.

4. Press switch F6 to enter the breaker mode.

6-16
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT

CHECK POINTS WHEN USING BREAKER

• Is the stop valve in FREE position?
• Is the working mode set to B mode?
For the oil passage route, see “METHOD FOR CHANGE-OVER AND CONNECT HYDRAULIC CIRCUIT
FOR MACHINE READY FOR INSTALLATION OF ATTACHMENT (6-9)”.
• Do you replace the hydraulic oil and its filter element at intervals shorter than the standard?
The deterioration of the hydraulic oil when using the breaker is much faster than in the normal operations,
so check the maintenance time with “MAINTENANCE SCHEDULE (4-13)”.
When considering whether it is necessary to install an accumulator for the attachment circuit, contact the
attachment manufacturer and then decide.
When handling the breaker, follow the instruction manual from the breaker manufacturer and use the break-
er correctly.

METHOD FOR OPERATING GENERAL ATTACHMENT SUCH AS CRUSHER ETC

1. Set the working mode to ATT/P or ATT/E mode.
2. Set both front and rear lock pins to FREE position (c).
3. Depress the front or rear side of the pedal.

The attachment operates.

6-17
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT ATTACHMENTS AND OPTIONS

METHOD FOR OPERATING WHEN WORK MODE PILOT DISPLAY DOES NOT
SHOW EITHER ATT/P OR ATT/E OF ATTACHMENT MODE
Change the working mode and enter the Attachment Mode.
1. Press the working mode selector switch (1).
The screen changes to working mode selection screen.

2. Press working mode selector switch (1) or switch F3 or F4

to select attachment mode ATT/P or ATT/E.
3. With Attachment Mode ATT/P or ATT/E highlighted in yel-
low, enter the selection by either of the following opera-
tions.
1) Keep working mode selector switch (1) pressed.
2) Leave as it is for 5 seconds.
3) Press switch F6.
REMARK
Even if P, E, or L mode is selected, the attachment is not
operated.
When using the Attachment Mode, check that the Attach-
ment Mode is active before starting operations.
On “Attachment Setting” of the user menu, it is possible to
make the attachment mode inactive.

CHECK POINTS WHEN USING GENERAL ATTACHMENT SUCH AS CRUSHER

ETC
• Is the stop valve in FREE position?
• Is the working mode ATT/P or ATT/E?
For the oil passage route, see “METHOD FOR CHANGE-OVER AND CONNECT HYDRAULIC CIRCUIT
FOR MACHINE READY FOR INSTALLATION OF ATTACHMENT (6-9)”.
When handling the attachment, follow the instruction manual from the manufacturer and use the attachment
correctly.

6-18
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT

LONG-TERM STORAGE
NOTICE
If there is no breaker or general attachment installed, operating the pedal may cause overheating and
other problems.
If the equipment is not to be used for a long time, do as follows.
• Set the stop valve in LOCK condition.
• Install the plugs to the piping end of the stop valve.
• Set the lock pin in LOCK position.

MAINTENANCE OF ADDITIONAL FILTER FOR BREAKER

k WARNING
• Immediately after the engine is stopped, its parts and oil are still very hot, and may cause burn in-
jury. Accordingly, wait until they have cooled down before starting the work.
• When using compressed air, there is a danger that dirt may scatter and cause personal injury.
Always wear protective equipment such as protective eyeglasses and dust mask.

NOTICE
For the element replacement interval, see “MAINTENANCE INTERVAL FOR HYDRAULIC BREAKER
(4-15)”.
Items to be prepared
Container to receive drained oil
Prepare for the maintenance so that it can be performed as follows.
1. Lower the work equipment to the ground and stop the en-
gine.

2. Turn the starting switch to ON (B) position.

6-19
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT ATTACHMENTS AND OPTIONS

3. Set the lock lever to FREE position (F).

4. Operate each work equipment control lever and attach-

ment control pedal fully to the front, rear, right, and left a
few times within 15 seconds to release the internal pres-
sure in the hydraulic circuit.

5. Set the lock lever to LOCK position (L).

After preparation is completed, replace the additional filter for breaker according to the following procedure.

METHOD FOR REPLACING ADDITIONAL FILTER ELEMENT FOR BREAKER

1. Loosen oil filler cap (F) slowly on the top of the hydraulic
tank to release the internal pressure in the hydraulic tank.

6-20
ATTACHMENTS AND OPTIONS HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT

2. Set a container to receive the oil under the additional filter

at the position pointed with the arrow.

3. Remove plug (1) and drain the hydraulic oil accumulated in

filter case (2) into the prepared oil container.
4. After checking that the hydraulic oil temperature has drop-
ped, turn filter case (2) counterclockwise, remove it, then
remove element (3).
5. Clean the removed parts, then install new element (3).
REMARK
Element (3) must be installed facing in the correct direc-
tion. Set direction (Y) with the holes in it up, and fit the hole
in element (3) on the protruding part inside filter head (4).
6. Fit new O-ring (5) to filter case (2) and screw filter case (2)
into filter head (4).
7. After the top of filter case (2) touches the filter head, tight-
en it further at least 1/2 turn.
8. Clean the removed plug (1) and fit a new O-ring (6) to plug
(1).
9. Install plug (1) to filter case (2).

METHOD FOR REPLACING ADDITIONAL PILOT FILTER ELEMENT FOR BREAK-

ER
1. Loosen oil filler cap (F) slowly on the top of the hydraulic
tank to release the internal pressure in the hydraulic tank.

2. Set a container to receive the oil under additional pilot filter

(1).

6-21
HANDLE MACHINE READY FOR INSTALLATION OF ATTACHMENT ATTACHMENTS AND OPTIONS

3. After checking that the hydraulic oil temperature has drop-

ped, turn filter case (1) counterclockwise, remove it, then
remove element (2).

4. Clean the removed parts, then install new element (2).

REMARK
Element (2) must be installed facing in the correct direc-
tion. Set direction (Y) with the holes in it up, and fit the hole
in element (2) on the protruding part inside filter head (4).
5. Install a new O-ring (3) to filter case (1), then tighten filter
case (1).
Tightening torque: 25 to 35 Nm {2.6 to 3.6 kgm, 18.8 to
26.0 lbft}

SPECIFICATIONS
Hydraulic specifications
• Max. flow when merged: 275×2 ℓ/min
• Safety valve relief set pressure of service valve
Port A: 21.6 MPa {220 kg/cm2, 3130 PSI} (other than mode B)
Port B: 24.5 MPa {250 kg/cm2, 3560 PSI} (other than mode B)
• Safety valve cracking pressure of service valve
Port A: 17.2 MPa {175 kg/cm2, 2490 PSI} (other than mode B)
Port B: 20.1 MPa {205 kg/cm2, 2920 PSI} (other than mode B)
• Safety valve relief set pressure of service valve: 21.6 MPa {220 kg/cm2, 3130 PSI} (mode B)
• Safety valve cracking pressure of service valve: 17.2 MPa {175 kg/cm2, 2490 PSI} (mode B)

6-22
ATTACHMENTS AND OPTIONS METHOD FOR CHANGING CONTROL PATTERNS

METHOD FOR CHANGING CONTROL PATTERNS

k WARNING
• When operating the machine, check that the display of the control pattern card is matched to the
operation of the machine to prevent personal injury by malfunction.
If it does not match, replace it immediately with the correct control pattern card.
• When checking the movement of the machine, operate slowly while paying attention to the safety
around the machine.
• When changing the control pattern of the machine, stop the engine and check that the lock lever is
in LOCK position.

1. Set the machine in the parking posture, stop the engine,

and set the lock lever to LOCK position (L).

2. Loosen wing bolt (1).

The change-over valve is located at the rear of operator's
cab.
3. Change the position of handle (2) to the desired control
pattern.
(A): ISO pattern
(B): Backhoe pattern
4. After changing the control pattern, tighten wing bolt (1) se-
curely.

5. Replace the control pattern card (case-in type) according

to the selected pattern.

6-23
METHOD FOR CHANGING CONTROL PATTERNS ATTACHMENTS AND OPTIONS

6. Start the engine and set the lock lever in FREE position
(F).
7. Operate the work equipment control levers slowly to check
that the pattern has been changed.

CONTROL PATTERNS OTHER THAN STANDARD CONTROL METHOD

k WARNING
• When operating the machine, check that the display of
the control pattern card is matched to the operation of
the machine to prevent personal injury by malfunction.
If it does not match, replace it immediately with the
correct control pattern card.
• When checking the movement of the machine, operate
slowly while paying attention to the safety around the
machine.
• When changing the control pattern of the machine,
stop the engine and check that the lock lever is in
LOCK position.

REMARK
The control pattern cards are replaceable. If the control pattern is changed, replace the control pattern card with
the one for the new control pattern.
If the pattern selector valve is installed, you can change the control pattern of the work equipment control lever
as you like.
ISO pattern Backhoe pattern

6-24
ATTACHMENTS AND OPTIONS ATTACHMENTS AND OPTIONS

ATTACHMENTS AND OPTIONS

k WARNING
• Read the instruction manual for the attachment and the sections of this manual related to attach-
ments and options.
• Installing any attachment or optional equipment is related to the safety issue. Contact your Komat-
su distributor before installing.
• Installing attachments or optional equipment without consulting your Komatsu distributor may not
only cause problems with safety, but may also have an adverse effect on the operation of the ma-
chine and the life of the equipment.
• Any personal injuries, product failures, physical loss or damage resulting from the use of unauthor-
ized attachments or parts will not be the responsibility of Komatsu.

INSTALL ATTACHMENT
k WARNING
Depending on the type or combination of work equipment, there is a danger that the work equipment
may hit the cab or machine body.
When using unfamiliar work equipment for the first time, check before starting if there is any danger of
interference, and operate it with care.

Categories of use
Select a proper attachment for each use.
General digging
Digging or loading sand, gravel, clay etc.
Light duty digging
Digging and loading dry and loose sandy soil, or muddy soil.
Loading
Loading of dry and loose earth.
REMARK
For digging or loading hard soil or soft rock, it is recommended that the strengthened bucket with high durability
and high wear resistance be employed.
Combination of attachments
NOTICE
When the long arm is equipped, if the bucket is drawn to the machine body, the arm interferes with the
body. Operate the long arm carefully.
When the boom is fully lowered during oblique digging, the boom interferes with the undercarriage. Op-
erate the boom carefully.

6-25
ATTACHMENTS AND OPTIONS ATTACHMENTS AND OPTIONS

This table lists the combination of attachments which can be installed to the long arm (standard) and
short arm.
○: Can be used, △: Can be used only for light duty work, ×: Cannot be used Mark: Equipped with side
cutter
7000
7000  mm standard boom  mm HD
Capaci- Opening boom
ty width
Model Use Standard Ultra short Semi- Long
 m3  mm Short arm HD arm
arm arm long arm arm
{cu.yd} {ft in} 2.9  m 3.4  m
3.4  m 2.4  m 4.0  m 4.8  m
{9' 6"} {11' 2"}
{11' 2"} {7' 10"} {13' 1"} {15' 9"}
1.3 1,120 Narrow
* Narrow bucket ○ ○ ○ ○ ○ ×
{1.7} {3' 8"} digging

1.6 1,270 Narrow

* Narrow bucket ○ ○ ○ △ △ ×
{2.1} {4' 2"} digging

1.9 1,475 General

* Standard bucket ○ ○ ○ × × ×
{2.5} {4' 10"} digging

* Light duty bucket 2.1 1,565 Loading △ △ ○ × × ×

{2.7} {5' 2"}
2.2 1,715
Light duty bucket Loading △ △ △ × × ×
{2.9} {5' 8"}

1.9 1,625 For dig-

* Rock bucket ging soft ○ ○ ○ × × ○
{2.5} {5' 4"} rock

2.1 1,745 For dig-

* Rock bucket ging soft △ △ △ × × △
{2.7} {5' 9"} rock
1.1 1,250 Digging
Ripper bucket ○ ○ ○ × × ○
{1.4} {4' 1"} rocks

Digging,
Single-shank rip-
- - removing ○ ○ ○ × × ○
per
rocks

Combination of attachments
NOTICE
When the boom is fully lowered during oblique digging, the boom interferes with the undercarriage. Op-
erate the boom carefully.

This table lists the combination of attachments which can be installed to the standard HD arm.
○: Can be used, △: Can be used only for light duty work, ×: Cannot be used Mark: Equipped with side
cutter
Capaci- Opening Standard
ty width arm
Model Use
 m3  mm 3.4 m
{cu.yd} {ft in} {11' 2"}

* Rock (standard) 1.9 1,625

General digging ○
bucket {2.5} {5' 4"}

6-26
ATTACHMENTS AND OPTIONS ATTACHMENTS AND OPTIONS

Capaci- Opening Standard

ty width arm
Model Use
 m3  mm 3.4 m
{cu.yd} {ft in} {11' 2"}

* Rock (large- 2.1 1,745

Large-sized from digging ○
sized) bucket {2.7} {5' 9"}
1.1 1,250
Ripper bucket Digging rocks ○
{1.4} {4' 1"}
Single-shank rip-
- - Digging, removing rocks ○
per

TRACK SHOES SELECTION

Select the appropriate track shoe to match the operating conditions.
Track shoe selection
1. Check the ground to work in Use column of Classification by use table, and then check Classification col-
umn.

Classification by use
Use Precautions when using
These shoes cannot be used on rough ground where there are large obstacles such as boulders or
Normal soil fallen trees.
Soft ground Use high-speed (Hi) and mid-range speed (Mi) on only flat roads. If it is obliged to travel over an
obstacle, travel slowly at approximately 1/2 of low-speed (Lo).
2. Check Classification column in List of shoe specifications and select a suitable shoe for the use.

List of shoe specifications

PC490
Specification
Standard 700 mm {2 ft 4 in} Triple
(if equipped) 600 mm {2 ft 0 in} Triple
(if equipped) 800 mm {2 ft 7 in} Triple
(if equipped) 900 mm {2 ft 11 in} Triple

Precaution for track shoe selection

• Since these are wide shoes, their use is limited.
Check the precautions for use and the using condition, and then use a suitable shoe.
• When selecting the shoe width, choose the narrowest shoes possible to bring the machine within the range
where there is no problem regarding the machine flotation and ground contact pressure.
If wider shoes than necessary are used, the load on the shoe will increase. It may cause problems such as
bending of the shoe, cracking of the link, damage of the pin, and looseness of the shoe bolts.

6-27
RECOMMENDED ATTACHMENT OPERATIONS ATTACHMENTS AND OPTIONS

RECOMMENDED ATTACHMENT OPERATIONS

The following descriptions are the precautions which must be followed when operating the hydraulic excavator
equipped with an attachment.
NOTICE
Select the optimum attachment model for the hydraulic excavator body.
The attachments and models ready for installation differ according to the machine body. For details of
the selection of the attachments or the models, consult your Komatsu distributor.

HYDRAULIC BREAKER
Applicable work
Major works suitable to the hydraulic breaker are as follows.
• Demolition work
• Crushing rock
• Road construction
This attachment can be used for a wide range of applications
including demolition of buildings, breaking up road surfaces or
slag, tunnel work, rock crushing and breaking operations in
quarries.

Precautions when performing breaking operations

Keep the chisel pushed perpendicularly against the impact sur-
face when performing breaking operations.
Push the chisel against the impact surface and operate so that
the chassis rises approximately 5 cm {2 in}  off the ground.

6-28
ATTACHMENTS AND OPTIONS RECOMMENDED ATTACHMENT OPERATIONS

Do not let the machine come further off the ground than this
amount.

When the chisel does not penetrate or break the surface by

continuous impact to the same impact surface for 1 minute,
change the point of impact and perform breaking operations by
scraping from the edge.

The direction of penetration of the chisel and the direction of

the breaker body will gradually move out of line with each oth-
er, always adjust the bucket cylinder to keep them aligned.

Always keep the chisel pressed against the impact surface

properly not to strike at the air.

Prohibited operations
To ensure that the machine has a long life, and to ensure that operations are performed in safety, do not operate
the machine in any of the following ways.
Do not operate all cylinders to the end of their strokes. Always leave approximately 5 cm {2 in}  to spare.

6-29
RECOMMENDED ATTACHMENT OPERATIONS ATTACHMENTS AND OPTIONS

Do not use the mount to gather in pieces of rock.

Do not work by using the swing force.

Do not move the chisel while performing breaking operation.

Do not perform breaker operation in horizontal or upward direc-

tion.

Do not work under water.

6-30
ATTACHMENTS AND OPTIONS RECOMMENDED ATTACHMENT OPERATIONS

Do not pry the ground or rock with the chisel penetrated.

Do not perform pick work.

Extending the bucket cylinder rod fully and thrusting to raise

the machine off the ground

Do not perform the breaker work with any cylinder at the stroke
end.

When greasing the hydraulic breaker, set it in the specified posture.

NOTICE
If the breaker is greased in an improper posture, it is filled with more grease than necessary.
As a result, dirt will enter the hydraulic circuit and can damage the hydraulic components while the
breaker is in use.
Be sure to grease the breaker, keeping it in the right posture.
Grease the breaker while holding it in the right posture shown below.

6-31
RECOMMENDED ATTACHMENT OPERATIONS ATTACHMENTS AND OPTIONS

1. Lower the chisel to the ground perpendicularly.

2. Insert the grease pump perpendicularly to the greasing
point.

Wrong posture
Do not perform greasing when the hydraulic breaker is lowered
to the ground.

Do not perform greasing when the chisel is not lowered to the

ground.

6-32
REPLACEMENT PARTS

7-1
PERIODIC REPLACEMENT OF DEFINED LIFE PARTS REPLACEMENT PARTS

PERIODIC REPLACEMENT OF DEFINED LIFE PARTS

For using the machine safely for an extended period of time, you must periodically replace the safety critical and
fire prevention-related parts listed in the table of the defined life parts.
Material quality of these parts can change as time passes and they are likely to wear out or deteriorate. Howev-
er, it is difficult to determine the extent of wear or deterioration at the time of periodic maintenance. Hence, it is
required to replace them with new ones regardless of their condition after a certain period of usage. This is im-
portant to ensure that these parts maintain their full performance at all times.
Furthermore, should anything abnormal be found on any of these parts, replace it with a new one even if the
periodic replacement time for the part has not yet arrived.
If any of the hose clamps show deterioration like deformation or cracking, replace the clamps at the same time
as the hoses.
Also perform the following checks with hydraulic hoses which need not to be replaced periodically. Tighten all
loose hoses and replace defective hoses, as required.
When replacing hoses, always replace O-rings, gaskets, and other such parts at the same time.
Have your Komatsu distributor replace the defined life parts.

DEFINED LIFE PARTS LIST

No. Parts for periodic replacement Replacement interval
1 Fuel system Fuel hose
Spill hose
2 Engine lubrication system Turbocharger lubrication hose
Engine oil filter hose
3 Work equipment hydraulic Main pump delivery hose
system Pump delivery hose
Pump branch hose
Main pump LS hose
Hydraulic drive fan hose (Intake fan)
Swing line hose Every 2 years or 4000 hours,
Main suction hose whichever comes sooner
External work equipment hose
• Boom foot connection hose
• Boom cylinder hose
• Arm connection hose
• Arm cylinder hose
• Bucket cylinder hose
• Line hose for additional attachment
4 Others PPC accumulator
Accumulator for additional attachment
Every 3 years from start of us-
age or 5 years after manufac-
Seat belt
turing of seat belt, whichever
comes sooner.

7-2
REPLACEMENT PARTS CONSUMABLE PARTS

CONSUMABLE PARTS
Replace consumable parts such as the filter element or air cleaner element at the time of periodic maintenance
or before they reach the wear limit. The consumable parts should be replaced correctly in order to ensure more
economic use of the machine. When replacing parts, Komatsu recommends using Komatsu genuine parts.
As a result of our continuous efforts to improve product quality, the part number may change. Inform your Ko-
matsu distributor of the machine serial number and check the latest part number when ordering parts.

CONSUMABLE PARTS
The parts in parentheses are to be replaced at the same time.
Replacement in-
Item Part No. Part Name Q'ty
terval
Engine oil filter 600-211-1340 Cartridge 1 Every 500 hours
Cartridge
Fuel prefilter 600-319-4800 1 Every 500 hours
(including O-ring)
208-60-71124 Element 1 Every 1000
Hydraulic oil filter
(07000-15210) (O-ring) (1) hours

Every 1000
Breather of hydraulic tank 421-60-35170 Element 1
hours
Every 1000
Fuel main filter 600-319-3841 Cartridge 1
hours
Every 1000
DEF tank breather 421-60-35170 Element 1
hours
Every 2000
KCCV filter 600-331-1900 Element 1
hours
Every 2000
DEF filter 6540-71-2320 Element 1
hours
Air conditioner RECIRC air filter 2A5-979-1551 Filter 1 Every 1 year
Air conditioner FRESH air filter 17M-911-3530 Element 1 Every 1 year
Air cleaner 600-185-6100 Element assembly 1 -
207-970-5121 Element 1
Additional filter for breaker
(07000-12011) (O-ring) (1) -
(if equipped)
(07000-12125) (O-ring) (1)

7-3
CONSUMABLE PARTS REPLACEMENT PARTS

Replacement in-
Item Part No. Part Name Q'ty
terval
Vertical pin type
208-70-34211 Tooth 5
(208-70-34220) (Pin) (5)
(208-70-34191) (Lock) (5)
Horizontal pin type
208-70-14152 Tooth 5
(09244-03036) (Pin) (5)
Bucket Side cutter type -
208-70-34160 Side cutter (left) 1
208-70-34170 Side cutter (right) 1
Shroud type
208-934-7132 Shroud 4
113-78-21170 Pin 8
209-939-7110 Shim 16
209-939-7120 Shim 8

7-4
REPLACEMENT PARTS RECOMMENDED FUEL, COOLANT, AND LUBRICANT

RECOMMENDED FUEL, COOLANT, AND LUBRICANT

NOTICE
• Komatsu genuine oils are conditioned to maintain the reliability and durability of Komatsu construc-
tion equipment and components.
In order to keep your machine in the best condition for long period of time, it is essential to follow
the instructions in this Operation and Maintenance Manual.
• Failure to follow these recommendations may result in shortened life or excessive wear of the en-
gine, power train, cooling system, and/or other components.
• Commercially available lubricant additives may be good or bad for the machine. Komatsu does not
recommend any commercially available lubricant additive.
• Komatsu recommends using Komatsu genuine engine oil for KDPF. If engine oil other than Komat-
su genuine oil for KDPF is used, it may shorten cleaning interval of KDPF filters, adversely affect
the engine such as deteriorated oil may reduce lubricating function, and it may cause failure, short-
ening of the machine life, lowering of performance and increase of fuel consumption.
• Use the fuel, the oil and the lubricant according to the ambient temperature as recommended.
• If the machine is operated at a temperature of -20 °C {-4 °F}  and below, separate devices are need-
ed, so consult your Komatsu distributor.
NOTICE
The fuel used must be ultra low-sulfur diesel fuel.
To ensure good fuel consumption characteristics and ex-
haust gas characteristics, the engine mounted on this ma-
chine uses an electronically controlled high-pressure fuel
injection device and emission gas control system (KDPF).
Since the high-pressure fuel injection device requires high
precision parts and lubrication, if low viscosity fuel with
low lubricating ability is used, its durability may drop con-
siderably. And using fuel with high sulfur content can dete-
riorate the engine parts and KDPF catalyzer, inducing fail-
ures, decrease of the life and degradation in performance.
The ASTM diesel fuel recommended by Komatsu may con-
tain 5 % or less of biofuel. The EN diesel fuel may contain
7 % or less of it. Use the fuel which is filled into the storage
tank or the fuel tank of the machine as soon as possible.
The use of metallic fuel additives is strictly prohibited.
Metallic components in the additives will not be burnt dur-
ing the KDPF regeneration, and may cause abnormal con-
ditions in the exhaust gas after treatment devices.
NOTICE
Use DEF as the aqueous urea solution for SCR system.
DEF is a colorless transparent 32.5 % aqueous urea solution.
The quality of DEF is prescribed in ISO22241-1. Always use DEF that conforms to this quality standard.
In North America, use DEF (Diesel Exhaust Fluid) which is
certified by API (American Petroleum Institute). The certi-
fied DEF has the API DEF Certification Mark shown as fol-
lows. Look for the API DEF Certification Mark when pur-
chasing DEF.
API Diesel Exhaust Fluid Certification Mark is the trade
mark of API (American Petroleum Institute).

7-5
RECOMMENDED FUEL, COOLANT, AND LUBRICANT REPLACEMENT PARTS

LUBRICATION CHART
• The lubrication standard chart uses symbols to show the lubrication points and types of lubricant by each
lubrication interval.
Keep this standard chart in the magazine box inside the cab so that the people concerned can reference it
any time during lubrication.
• Even if the same symbol is used in the lubrication standard chart, the recommended genuine oil may differ
according to the lubricated location and the ambient temperature. For details, see “USE OF FUEL, COOL-
ANT AND LUBRICANTS TO ACCORDING TO AMBIENT TEMPERATURE (7-7)”.
• For details of lubrication, see “MAINTENANCE SCHEDULE (4-13)”.

7-6
REPLACEMENT PARTS RECOMMENDED FUEL, COOLANT, AND LUBRICANT

USE OF FUEL, COOLANT AND LUBRICANTS TO ACCORDING TO AMBI-

ENT TEMPERATURE

ASTM: American Society of Testing and Material

Final drive
Swing case Hydraulic
Engine oil Damper Cooling Fuel DEF
machi- (each of oil sys-
pan case system Tank tank
nery case right and tem
left)
Speci- Liter 46.0 20.0 11.0 1.6 472 47.0 650 60.5
fied ca-
pacity US gal 12.20 5.3 2.9 0.4 125 12.4 172 16.0

Refill ca- Liter 37.0 20.0 11.0 1.6 248 44.0 - -

pacity
US gal 9.78 5.3 2.9 0.4 65.5 11.6 - -

REMARK
Specified capacity means the total amount of oil including the oil in the tank and the piping. Refill capacity
means the amount of oil needed to refill the system during inspection and maintenance.

7-7
RECOMMENDED FUEL, COOLANT, AND LUBRICANT REPLACEMENT PARTS

Note 1: KDPF engine oil for cold district is deteriorated easily than that for normal area (replace every 500
hours), so replace oil and filter cartridge every 250 hours. For changing maintenance time of machine monitor,
ask your Komatsu distributor to perform the work.
Note 2: Power train oil has different properties from engine oil. Be sure to use the recommended oils.
Note 3: Hyper white grease (G2-T, G2-TE) has a high performance.
When it is necessary to improve the lubricating ability of the grease in order to prevent squeaking of pins and
bushings, the use of G2-T or G2-TE is recommended.
Note 4: Non-Amine Engine Coolant (AF-NAC)
1. The coolant has the important function of an anticorrosive as well as freeze proofing.
Even in the areas where freezing is not an issue, the use of coolant is essential.
Komatsu recommends the use of Non-Amine Engine Coolant (AF-NAC). If you use another coolant, it may
cause serious problems in the cooling system, including the engine.
Komatsu machines are supplied with Non-Amine Engine Coolant (AF-NAC). Non-Amine Engine Coolant
(AF-NAC) has excellent anti-corrosion, antifreeze and cooling properties and can be used continuously for
2 years or 4000 hours.
Non-Amine Engine Coolant (AF-NAC) is strongly recommended wherever available.
2. For details of the density of Non-Amine Engine Coolant (AF-NAC), see “METHOD FOR CLEANING INSIDE
OF COOLING SYSTEM (4-21)”.
Non-Amine Engine Coolant (AF-NAC) is supplied already diluted. In this case, fill up the tank with pre-dilut-
ed fluid. (Never dilute the Non-Amine Engine Coolant with ordinary water.)
Note 5: If this oil is used for hydraulic system, fuel consumption increases.
We strongly recommend HO56-HE for hydraulic oil.
Note 6: DEF freezes at -11 °C {12 °F} . If thawing is necessary, DEF system is automatically heated and thawed
after the engine is started.

RECOMMENDED BRANDS AND QUALITIES OTHER THAN KOMATSU

GENUINE OILS
When using commercially available oils other than Komatsu genuine oil, consult your Komatsu distributor.

7-8
INDEX

INDEX
Symbols Attachment - Operate............................................6-15
Attachment - Remove........................................... 6-11
12H24H display mode - Switch.............................3-89 Attachment - Remove / Install............................... 6-11
Attachment - Set................................................... 3-75
A Attachment if equipped - Bleed air........................4-46
Attachments and options...................................... 6-25
Accumulator............................................................ 6-8 Auto idle stop timer - Set.......................................3-81
Accumulator - Function......................................... 4-75 Auto switch..........................................................3-234
Accumulator for control circuit - Check / Release ni- Auto-deceleration pilot lamp................................. 3-36
trogen gas charge pressure...........................4-75 Auto-deceleration switch.......................................3-50
Accumulator for control circuit - Replace.............. 4-86 Automatic operation - Start................................. 3-236
Accumulator function - Check............................... 4-76 Automatic operation - Stop................................. 3-237
Action Level Display..............................................3-21 Automatic warm-up operation - Cancel...............3-190
Actions if fire occurs..............................................2-18 AUX.....................................................................3-246
Actions when running out of fuel.........................3-271 Avoid mixing oil....................................................... 4-3
Additional filter element for breaker - Replace......6-20
Additional filter for breaker - Maintain................... 6-19
Additional pilot filter element for breaker - Replace.....
B
.......................................................................6-21 Backhoe work..................................................... 3-218
After cold weather season.................................. 3-268 Band/AUX selector button...................................3-244
After finishing work - Check................................ 3-224 Basic operation of machine monitor......................3-11
Aftertreatment devices regeneration.....................3-82 Battery.................................................................3-267
Aftertreatment devices regeneration disable - Cancel. Battery - Check electrolyte level from side............4-49
.....................................................................3-132 Battery - Check electrolyte level impossible from side.
Aftertreatment devices regeneration disable - Set....... .......................................................................4-50
.....................................................................3-129 Battery - Handle.................................................... 2-43
Aftertreatment devices regeneration pilot lamp.... 3-39 Battery - Precautions for removal and installation........
Air cleaner - Check............................................... 4-16 .....................................................................3-276
Air cleaner - Check / Clean / Replace...................4-16 Battery disconnect switch................................... 3-120
Air cleaner clogging caution lamp......................... 3-32 Battery electrolyte level - Check........................... 4-49
Air cleaner element - Replace...............................4-19 Before reading this manual..................................... 1-2
Air cleaner outer element - Clean......................... 4-16 Beware of asbestos dust.......................................2-26
Air conditioner - Check / Maintain......................... 4-37 Bleed air from hydraulic circuit................................4-3
Air conditioner - Handle...................................... 3-230 Breaker - Check points when using ..................... 6-17
Air conditioner - Operate.....................................3-236 Breaker - Operate................................................. 6-15
Air conditioner - Start manual operation............. 3-238 Breaker - Set.........................................................3-73
Air conditioner compressor belt - Check............... 4-51 Bucket - Invert.....................................................3-221
Air conditioner compressor belt tension - Adjust...4-52 Bucket - Replace.................................................3-220
Air conditioner compressor belt tension - Check / Ad- Bucket - Replace / Invert.....................................3-220
just................................................................. 4-51 Bucket clearance - Adjust..................................... 4-35
Air conditioner fresh air filter - Clean.....................4-61 Bucket side cutter / shroud - Replace................... 4-34
Air conditioner fresh/recirc filter - Clean................4-61 Bucket tooth (horizontal pin type) - Replace......... 4-33
Air conditioner pilot lamp.......................................3-38 Bucket tooth (vertical pin type) - Replace............. 4-30
Air conditioner recirculation air filter - Clean......... 4-61 Bucket with hook - Handle...................................... 6-4
Air conditioner switch..................................3-54,3-235 Buzzer cancel switch............................................ 3-54
Air conditioner system caution lamp..................... 3-32
Air suspension seat hardness - Adjust................3-167 C
Alternator - Check................................................. 4-78
Alternator belt tension - Check / Replace............. 4-72 Cab door - Lock / Unlock.................................... 3-229
Always use clean washer fluid................................ 4-2 Cab door hinge....................................................3-115
Antenna - Stow................................................... 3-249 Cab equipment names............................................3-4
Appoint leader when working with others............. 2-39 Cab floor - Clean...................................................4-39
Armrest angle - Adjust........................................ 3-166 Cab front window - Open / Close........................ 3-109
Armrest height - Adjust....................................... 3-166 Calendar - Set.......................................................3-87
Ashtray................................................................ 3-116 Camera image selector switch - Select.................3-55
Attachment - Install....................................... 6-12,6-25 Cap and cover with lock...................................... 3-115

8-1
 INDEX

Cap with lock - Lock............................................3-225 DEF tank - Clean.................................................. 4-88

Cap with lock - Open...........................................3-225 DEF tank breather element - Replace.................. 4-71
Cap with lock - Open / Close.............................. 3-225 DEF tank filler cap cover - Lock.......................... 3-229
Caution lamp for sudden engine stop by automatic DEF tank filler cap cover - Open / Close.............3-228
idle stop......................................................... 3-30 DEF tank filler cap cover - Unlock.......................3-228
Caution lamp list................................................... 3-21 Defined life parts list....................................... 4-85,7-2
Ceiling window - Open / Close............................3-109 Defroster - Operate............................................. 3-242
Ceiling window wiper switch............................... 3-102 Digging work....................................................... 3-218
Center frame / track frame connecting bolt - Check Directions of machine............................................. 1-4
looseness / Retighten.................................... 4-52 Display................................................................ 3-245
Charge level caution lamp.................................... 3-32 Display monitor................................................... 3-234
Check and maintenance items..............................4-37 Display selector button........................................3-245
Check drained oil and used filter.............................4-2 Display setting - Change.......................................3-66
Check service meter reading.................................. 4-2 Display warning tag during inspection and mainte-
Check signs and signalman's signals................... 2-26 nance............................................................. 2-39
Checks and adjustment before starting engine............ Display/non-display of ECO gauge - Switch......... 3-68
.............................................................2-27,3-150 Display/non-display of ECO guidance - Switch.....3-70
Checks before starting..................................2-29,4-47 Display/non-display of guidance when key is OFF -
Cigarette lighter.....................................................3-97 Switch............................................................ 3-71
Clock - Adjust..............................................3-86,3-249 Ditching work...................................................... 3-219
Cold weather operation.......................................3-266 Do not disassemble recoil spring.......................... 2-46
Cold weather operation information.................... 3-266 Do not drop things inside machine..........................4-2
Consumable parts...................................................7-3 Do not get caught in work equipment................... 2-21
Consumable parts list............................................. 7-3 Do not go close to high-voltage cables................. 2-25
Contents of safety labels.........................................2-7 Do not travel long time continuously................... 3-214
Control levers and pedals................................... 3-105 Door lock - Use................................................... 3-114
Control pattern change-over valve - Change control Drain valve - Adjust.............................................3-153
patterns..........................................................6-23 Drink box............................................................. 3-115
Control patterns other than standard control method... Dusty jobsite........................................................... 4-3
.......................................................................6-24
Control pedals.........................................................6-6 E
Controls and gauges names................................... 3-5
Coolant................................................................3-266 ECO gauge........................................................... 3-44
Coolant - Check level / Add................................ 3-156 ECO guidance.......................................................3-40
Coolant and water for dilution................................. 4-6 ECO guidance record - Check.............................. 3-63
Cooling system - Clean inside.............................. 4-21 Economy mode - Adjust........................................3-72
Counter-rotation turn...........................................3-204 Effective use of hydraulic excavator................... 3-219
Cover with lock - Lock.........................................3-226 Electric wiring - Check........................................ 3-158
Cover with lock - Open........................................3-226 Electrical components - Handle............................ 4-10
Cover with lock - Open / Close........................... 3-226 Emergency escape hammer............................... 3-114
Cup holder...........................................................3-116 Emergency exit from operator's cab..................... 2-21
Current Abnormality display switch.......................3-24 Energy saving guidance........................................3-63
Cylinder - Bleed air............................................... 4-44 Engine - Check low-speed run and acceleration 3-187
Engine - Check starting condition and unusual noise..
.....................................................................3-187
D Engine - Operate / Check after starting.............. 3-187
Damper case - Check oil level / Add oil................ 4-67 Engine - Operate / Check before starting........... 3-181
Daylight saving time - Set..................................... 3-89 Engine - Preheat manually..................................3-186
DEF...............................................................3-266,4-7 Engine - Start....................................3-183,3-279,4-44
DEF - Check level / Add......................................3-160 Engine - Start using fuel feed pump......................4-69
DEF - Store............................................................. 4-9 Engine - Start with jumper cables....................... 3-278
DEF filter............................................................. 3-147 Engine - Stop...................................................... 3-198
DEF filter - Replace...............................................4-82 Engine - Warm-up operation............................... 3-188
DEF hose - Replace..............................................4-92 Engine coolant temperature caution lamp............ 3-25
DEF level caution lamp......................................... 3-28 Engine coolant temperature gauge.......................3-42
DEF level gauge................................................... 3-45 Engine high-pressure piping - Replace.................4-91
DEF system caution lamp..................................... 3-29 Engine high-pressure piping clamp - Check for loose-
DEF system high temperature stop caution lamp. 3-29 ness and hardening of rubber........................4-87

8-2
INDEX

Engine hood - Close securely................................. 4-4 Fuel doser - Clean................................................ 4-88

Engine hood - Lock / Unlock............................... 3-227 Fuel gauge............................................................ 3-43
Engine hood lock - Lock......................................3-227 Fuel level caution lamp......................................... 3-26
Engine hood lock - Open.................................... 3-227 Fuel main filter cartridge - Replace....................... 4-68
Engine intake pipe clamps - Check all tightening Fuel prefilter cartridge - Replace...........................4-56
points............................................................. 4-69 Fuel spray prevention cap - Check for missing and
Engine oil pan - Change oil / Engine oil filter cartridge hardening of rubber....................................... 4-87
- Replace....................................................... 4-55 Fuel spray prevention cap - Replace.................... 4-91
Engine oil pan - Check oil level / Add oil.............3-157 Fuel spray prevention cap on fuel doser piping -
Engine oil pressure caution lamp..........................3-31 Check for missing and hardening of rubber...4-88
Engine overrun caution lamp................................ 3-31 Fuel spray prevention cap on fuel doser piping - Re-
Engine related parts - Act for phenomena.......... 3-282 place.............................................................. 4-92
Engine shutdown secondary switch....................3-103 Fuel tank - Drain water and sediment................. 3-152
Engine stop pilot lamp...........................................3-38 Fuel, coolant and lubricants according to ambient
Engine system caution lamp................................. 3-30 temperature - Use............................................7-7
Engine technology to conform exhaust gas emission . Function switches................................................. 3-55
.........................................................................1-6 Function switches and guidance icons................. 3-46
Engine valve clearance - Check / Adjust.............. 4-78 Fuse.................................................................... 3-117
Ensure good visibility............................................ 2-25 Fusible link.......................................................... 3-119
Ensuring safe operation........................................ 2-16
Every 1000 hours maintenance............................ 4-65 G
Every 2000 hours maintenance............................ 4-73
Every 250 hours maintenance.............................. 4-49 Gas spring - Check............................................... 4-43
Every 4000 hours maintenance............................ 4-85 General attachment such as crusher - Operate....6-17
Every 4500 hours maintenance............................ 4-88 General attachment such as crusher etc - Check
Every 50 hours maintenance................................ 4-48 points when using.......................................... 6-18
Every 500 hours maintenance.............................. 4-54 General character and precautions for handling...2-49
Every 5000 hours maintenance............................ 4-89 General precautions common to operation and main-
Every 8000 hours maintenance............................ 4-91 tenance.......................................................... 2-16
Every 9000 hours maintenance............................ 4-92 General view........................................................... 3-2
Explanation of air conditioner equipment............3-231 GPS synchronization - Set....................................3-87
Explanation of components.....................................3-9 Grease.................................................................... 4-7
Explanation of components on machine equipped Grease pump holder........................................... 3-119
with attachment................................................6-5
Explanation of machine monitor equipment............3-9 H
Explanation of radio equipment.......................... 3-244
Handle - Install.................................................... 3-260
Handle - Remove................................................ 3-260
F Handle - Remove / Install....................................3-260
Fan switch...........................................................3-231 Handle oil, fuel, coolant, and performing oil clinic...4-5
Filter........................................................................ 4-9 Handrail - Install.................................................. 3-259
Final drive case - Change oil................................ 4-73 Handrail - Remove.............................................. 3-258
Final drive case - Check oil level / Add oil............ 4-64 Handrail - Remove / Install..................................3-258
Fire extinguisher................................................. 3-120 Headrest - Adjust in vertical direction................. 3-165
Frequency - Adjust..............................................3-247 Headrest - Install.................................................3-168
Frequency - Auto-preset..................................... 3-247 Headrest - Remove.............................................3-168
Fresh and clean lubricants......................................4-2 Headrest - Remove / Install................................ 3-168
Freshrecirc air changeover switch...................... 3-234 High register range (treble) - Adjust....................3-248
Fuel......................................................................... 4-6 High-pressure hoses and pipings - Handle...........2-45
Fuel - Check level / Add......................................3-159 Horn - Check.......................................................3-163
Fuel and lubricants..............................................3-266 Horn switch........................................................... 3-98
Fuel and lubricants to match the ambient temperature Hydraulic breaker..................................................6-28
.........................................................................4-3 Hydraulic circuit - Bleed air................................... 4-44
Fuel circuit - Bleed air......................................... 3-271 Hydraulic circuit - Connect...................................... 6-9
Fuel consumption gauge.......................................3-45 Hydraulic circuit - Release internal pressure........ 4-77
Fuel consumption gauge - Set display..................3-67 Hydraulic circuit - Switch.......................................6-10
Fuel consumption record - Check......................... 3-64 Hydraulic circuit for machine ready for installation of
Fuel control dial.....................................................3-97 attachment - Change-over / Connect...............6-9

8-3
 INDEX

Hydraulic cooling fan - Rotate in reverse.............. 3-77 Lock lever automatic lock cancel switch............. 3-101
Hydraulic oil filter element - Replace.................... 4-65 Lock lever pilot lamp............................................. 3-39
Hydraulic oil temperature caution lamp.................3-25 Lock pin...................................................................6-7
Hydraulic oil temperature gauge........................... 3-42 Long-term storage.................................................6-19
Hydraulic system - Warm-up operation...............3-191 Low register range (bass) - Adjust...................... 3-248
Hydraulic system caution lamp............................. 3-26 Lubrication chart..................................................... 7-6
Hydraulic tank - Change oil...................................4-89
Hydraulic tank - Check oil level / Add oil.............3-154 M
Hydraulic tank additional breather element - Replace.
.......................................................................4-70 Machine - Change direction during straight travel........
Hydraulic tank strainer - Clean..............................4-74 .....................................................................3-204
Machine - Check walk-around............................ 3-150
Machine - Escape from mud............................... 3-217
I Machine - Lift...................................................... 3-262
If any problem is found..........................................2-17 Machine - Load................................................... 3-252
If machine monitor shows warning display......... 3-284 Machine - Lubricate.............................................. 4-54
Indicator - Check electrolyte level......................... 4-50 Machine - Operation after warm-up operation.... 3-196
Inside operator's compartment............................. 2-17 Machine - Park....................................................3-223
Inspecting machine............................................... 2-16 Machine - Raise using block ................................ 4-42
Introduction............................................................. 1-4 Machine - Raise using slope.................................4-41
Investigate and confirm jobsite conditions............ 2-24 Machine - Running-in the new machine..............3-188
Machine - Secure................................................3-254
J Machine - Secure with tie down point................. 3-255
Machine - Secure without tie down point............ 3-255
Jumper cable - Connect......................................3-279 Machine - Set at angle.......................................... 4-41
Jumper cable - Disconnect................................. 3-279 Machine - Start (Travel forward and reverse) / Stop....
.....................................................................3-200
K Machine - Start after long-term storage.............. 3-270
Machine - Steer (Change the direction).............. 3-203
KCCV filter element - Replace.............................. 4-79 Machine - Stop....................................................3-202
KDPF - Clean........................................................4-88 Machine - Swing................................................. 3-205
KDPF - Handle....................................................3-122 Machine - Travel forward.................................... 3-201
KDPF soot accumulation caution lamp................. 3-27 Machine - Travel reverse.................................... 3-201
KDPF system caution lamp...................................3-27 Machine - Unload................................................3-261
Keep machine clean............................................. 2-17 Machine equipment name.......................................3-2
Keep work place clean and tidy............................ 2-39 Machine monitor - Operate when operator identifica-
Komatsu Closed Crankcase Ventilation (KCCV) 3-133 tion function is available with skip..................3-91
Komatsu genuine lubricants....................................4-2 Machine monitor - Operate when operator identifica-
Komatsu genuine replacement parts...................... 4-2 tion function is available without skip.............3-92
KOMTRAX.......................................................... 3-148 Machine monitor - Operate when starting engine in
abnormal situation......................................... 3-15
L Machine monitor - Operate when starting engine in
normal situation..............................................3-11
Lamp switch.......................................................... 3-98
Machine monitor - Operate when starting engine
Language - Set..................................................... 3-90
while engine shutdown secondary switch is ON...
Left front mirror - Adjust...................................... 3-170
.......................................................................3-12
Left front mirror (A) - Adjust to the regular position......
Machine monitor - Operate when starting switch is
.....................................................................3-171
ON while operator ID input is set................... 3-13
Lifting operation by using bucket with hook.......... 2-38
Machine monitor - Operate when trouble occurs while
Line filter - Clean / Remove dirt............................ 4-46
operating machine......................................... 3-17
Loading and unloading with trailer...................... 3-251
Machine monitor equipment name..........................3-6
Loading work.......................................................3-219
Machine monitor Operate when stopping engine in
Location of engine number plate.............................1-7
normal situation............................................. 3-12
Location of product identification number (PIN)/
Machine operations and controls........................ 3-150
machine serial No. plate.................................. 1-7
Machine push-up switch..................................... 3-104
Location of safety labels......................................... 2-5
Machine ready for installation of attachment.......... 6-5
Lock.................................................................... 3-225
Machine settings................................................... 3-72
Lock inspection cover............................................. 4-3
Magazine box......................................................3-116
Lock lever............................................................3-105

8-4
INDEX

Main use of machine...............................................1-4 Periodic replacement of defined life parts.............2-48

Maintenance during long-term storage............... 3-269 Permissible depth of water soil and dirt.............. 3-215
Maintenance interval for hydraulic breaker........... 4-15 Phenomena and actions for chassis................... 3-281
Maintenance of air conditioner..............................2-47 Phenomena and actions for electrical system.... 3-280
Maintenance procedure........................................ 4-16 Phenomena that are not failures.........................3-272
Maintenance schedule.......................................... 4-13 Pilot display...........................................................3-35
Maintenance schedule table................................. 4-13 Pilot display and meter display............................. 3-34
Maintenance screen - Set..................................... 3-83 Pilot display of working mode does not display ATT/P
Maintenance time caution lamp............................ 3-33 ATT/E of attachment mode - Operate............ 6-18
Manual operation - Stop......................................3-239 Pilot display of working mode does not display Break-
Manual stationary regeneration - Operate.......... 3-126 er mode - Operate......................................... 6-16
Message - Check.................................................. 3-95 Pivot turn - Operate.............................................3-203
Message - Reply................................................... 3-95 Power button.......................................................3-244
Message display........................................... 3-38,3-94 Power supply outlet.............................................3-117
Meter display.........................................................3-42 Precautions after daily work completion............. 3-268
Method for adjusting........................................... 3-164 Precautions before starting inspection and mainte-
Method for checking before starting....................3-152 nance............................................................. 2-39
Method for steering machine.............................. 3-203 Precautions before starting operation................... 2-16
Mirror - Install...................................................... 3-257 Precautions for adding.......................................... 2-49
Mirror - Remove.................................................. 3-256 Precautions for adding DEF....................................4-2
Mirror - Remove / Install......................................3-256 Precautions for charging battery......................... 3-277
Mirrors - Adjust....................................................3-169 Precautions for check and maintenance...............2-43
Monitor settings.....................................................3-85 Precautions for cold weather................................ 2-28
Monitor switches................................................... 3-46 Precautions for compressed air............................ 2-47
Precautions for DEF..............................................2-49
N Precautions for discharged battery..................... 3-275
Precautions for disposing of waste materials........2-47
Nitrogen gas charge pressure (for breaker) - Check / Precautions for fire hazard and leakage............... 2-49
Release..........................................................4-70 Precautions for getting on or off machine............. 2-20
No jumping on or off machine............................... 2-20 Precautions for high speed travel....................... 3-214
No people on attachments.................................... 2-20 Precautions for high voltage................................. 2-46
Precautions for high-pressure fuel........................ 2-45
O Precautions for high-pressure grease when adjusting
track tension.................................................. 2-46
Observance of the applicable laws and regulations, Precautions for high-pressure oil.......................... 2-45
exemption.................................................... 3-149 Precautions for high-temperature coolant.............2-44
OFF switch..........................................................3-231 Precautions for high-temperature oil.....................2-44
Oil............................................................................4-5 Precautions for high-temperature parts................ 2-45
Oil filler cap - Install.............................................3-155 Precautions for installing, removing, or storing attach-
One-touch power maximizing function - Use...... 3-209 ments............................................................. 2-41
One-touch power maximizing pilot lamp............... 3-37 Precautions for jobsite.......................................... 2-24
One-touch power maximizing switch.................... 3-98 Precautions for KDPF............................................. 4-2
Only authorized personnel.................................... 2-39 Precautions for lifting operations.................... 2-38,6-4
Operation record - Check......................................3-63 Precautions for loading and unloading with trailer.......
Operation with cold air to face and warm air to feet - .....................................................................3-251
Start............................................................. 3-240 Precautions for long-term storage.......................3-269
Operator ID........................................................... 3-91 Precautions for maintenance....................2-39,4-2,4-3
Operator's seat - Adjust...................................... 3-164 Precautions for noise............................................ 2-46
Other equipment................................................. 3-109 Precautions for operation............. 2-24,2-29,3-214,6-4
Other precautions................................................. 2-49 Precautions for refilling oil or fuel............................4-2
Other trouble....................................................... 3-280 Precautions for SCR assembly............................... 4-3
Outline of KOMTRAX..........................................3-148 Precautions for severe job condition...................3-274
Outline of maintenance........................................... 4-5 Precautions for spreading and narrowing track frame
gauge...........................................................3-264
P Precautions for storing.......................................... 2-49
Precautions for towing and being towed............... 2-37
Pedal - Operate / oil flow of machine equipped with
Precautions for towing machine..........................3-273
attachment..................................................... 6-10
Precautions for transportation...............................2-36
Perform KOWA (Komatsu Oil Wear Analysis)........ 4-8

8-5
 INDEX

Precautions for transporting machine................. 3-250 Prohibition of operations using travel force.........3-210
Precautions for traveling..................................... 3-214 Prohibition of operations when machine is not stable..
Precautions for traveling in forward or reverse and .....................................................................3-212
swinging.........................................................2-29 Prohibition of sudden lever or pedal shift during high
Precautions for traveling on slopes.......................2-31 speed travel................................................. 3-213
Precautions for using.............................................. 6-2 Prohibition of swinging or traveling when rock is on
Precautions for using attachment and options........6-2 top of track assembly...................................3-213
Precautions for using KOMTRAX....................... 3-148 Protection against falling, flying or intruding objects....
Precautions for using lightweight towing hole..... 3-274 .......................................................................2-22
Precautions for welding.................................. 2-43,4-2 Provide fire extinguisher and first aid kit............... 2-17
Precautions for working at high places................. 2-41 Pump - Bleed air................................................... 4-44
Precautions for working on slope........................3-216 Pump secondary drive switch............................... 3-99
Precautions for working under machine or work
equipment...................................................... 2-42 R
Precautions related to attachments and options...2-23
Precautions related to cab glass...........................2-23 Radiator coolant level caution lamp...................... 3-31
Precautions related to protective structure........... 2-22 Radiator fin / Oil cooler fin / Aftercooler fin / Air condi-
Precautions to prevent fire.................................... 2-18 tioner condenser fin - Check / Clean............. 4-59
Precautions when installing hydraulic hoses.......... 4-3 Radio - Control....................................................3-247
Precautions when leaving machine...................... 2-21 Radio - Handle.................................................... 3-244
Precautions when loading and unloading............. 2-36 Read the operation and maintenance manual thor-
Precautions when operating on snow or frozen surfa- oughly.............................................................. 6-2
ces................................................................. 2-34 Rearview camera angle - Adjust......................... 3-177
Precautions when parking machine...................... 2-35 Recommended applications................................3-218
Precautions when removing and installing..............6-2 Recommended attachment operations................. 6-28
Precautions when running engine inside building.2-23 Recommended brands and qualities other than ko-
Precautions when selecting.................................... 6-2 matsu genuine oils...........................................7-8
Precautions when standing up from operator's seat.... Recommended fuel, coolant, and lubricant.............7-5
.......................................................................2-21 Refrigerant (gas) - Check level............................. 4-38
Precautions when starting engine.........................2-28 Replace defined life parts..................................... 4-85
Precautions when traveling...................................2-30 Revolving lamp switch........................................ 3-101
Precautions when using hammer..........................2-44 Right front mirror (A) - Adjust to the regular position....
Precautions when working on loose ground......... 2-24 .....................................................................3-174
Precautions when working on machine................ 2-42 Right front mirror (B) - Adjust.............................. 3-173
Preheating pilot lamp............................................ 3-35 Right side mirror (C) - Adjust.............................. 3-176
Preparation for long-term storage....................... 3-269 Room lamp switch.................................................3-99
Preparations for moving machine....................... 3-200
Preparations for safe operation.............................2-16 S
Preset - Call up................................................... 3-247
Preset - Register................................................. 3-248 Safety......................................................................2-2
Preset button.......................................................3-245 Safety information................................................... 1-3
Prevent fire............................................................2-18 Safety labels........................................................... 2-4
Product information.................................................1-7 Safety-related equipment......................................2-16
Prohibited operations..................................2-32,3-210 SCR information....................................................3-83
Prohibition of digging operation at an angle without Screen - Adjust..................................................... 3-85
engaging teeth............................................. 3-212 Seat - Adjust in fore-and aft................................ 3-164
Prohibition of digging operation on hard rocky ground. Seat - Heat..........................................................3-167
.....................................................................3-212 Seat belt - Fasten................................................3-180
Prohibition of high-speed travel operations on rough Seat belt - Fasten / Unfasten.............................. 3-180
ground..........................................................3-213 Seat belt - Unfasten............................................ 3-180
Prohibition of operations using bucket as lever...3-211 Seat heater switch.............................................. 3-104
Prohibition of operations using bucket dropping force. Seat height - Adjust.............................................3-165
..................................................................... 3-211 Seat reclining - Adjust......................................... 3-164
Prohibition of operations using hydraulic cylinders to Seat tilt - Adjust...................................................3-165
stroke end.................................................... 3-210 Seat unit fore-and-aft direction - Adjust.............. 3-167
Prohibition of operations using machine dropping Seatbelt caution lamp........................................... 3-33
force............................................................. 3-211 Select suitable place for inspection and maintenance.
Prohibition of operations using swing force........ 3-210 .......................................................................2-39

8-6
INDEX

Selector valve......................................................... 6-6 Turn battery disconnect switch to off position....... 2-43
Service meter / Clock............................................3-43 Two workers for maintenance when engine is running
Service meter location............................................ 1-8 .......................................................................2-41
Shovel work........................................................ 3-219
Shroud - Replace.................................................. 4-34 U
Side cutter - Replace............................................ 4-34
Sound balance - Adjust.......................................3-248 Unauthorized modification.................................... 2-23
Sound control button...........................................3-245 Understanding the machine.................................. 2-16
Specifications..................................................5-2,6-22 Urea SCR system - Handle.................................3-134
Spread and narrow track frame gauge............... 3-264 Use handrails and steps when getting on or off ma-
Standard tightening torque for bolts and nuts....... 4-11 chine.............................................................. 2-20
Start engine...........................................................2-27 Use proper tools....................................................2-42
Start engine with jumper cables............................2-28 Use warning tags.................................................. 2-27
Starting motor - Check.......................................... 4-85 User menu............................................................ 3-60
Starting switch.......................................................3-97 User menu display switch..................................... 3-60
Stop engine before performing inspection and main-
tenance.......................................................... 2-39 V
Stop valve............................................................... 6-5
Store oil and fuel..................................................... 4-8 Vacuator valve - Check /Replace..........................4-20
Sunlight sensor................................................... 3-235 Vent selector switch - Select............................... 3-233
Swing circle - Lubricate.........................................4-53 Visibility from operator's seat.................................. 1-5
Swing lock pilot lamp............................................ 3-36 Volume control button......................................... 3-244
Swing lock switch..................................................3-98
Swing machinery case - Change oil......................4-66 W
Swing machinery case - Check oil level / Add oil..4-63
Warning display.....................................................3-19
Swing motor - Bleed air.........................................4-45
Washable floor - Wash..........................................4-39
Swing parking brake cancel switch..................... 3-100
Washable floor mat - Clean...................................4-39
Swing pinion - Check grease level / Add grease.. 4-58
Water pump - Check............................................. 4-85
Switches................................................................3-96
Water separator - Check / Drain water and sediment..
System caution lamp.............................................3-26
.....................................................................3-152
System operating lamp....................................... 3-121
Wear well-fitting clothes and protective equipment......
.......................................................................2-16
T When handling accumulator and gas spring.........2-47
Target fuel consumption value displayed in ECO When operating on slopes.................................... 2-32
gauge - Set.................................................... 3-69 When required...................................................... 4-16
Temperature set switch....................................... 3-232 Window washer fluid - Check level / Add..............4-36
The additional filter for breaker............................... 6-7 Window washer fluid - select................................ 2-47
Time - Set..............................................................3-88 Window washer switch..........................................3-53
Tool box...............................................................3-119 Wiper pilot lamp.................................................... 3-36
Towing and being towed....................................... 2-37 Wiper switch..........................................................3-52
Track frame gauge - Narrow............................... 3-264 Work equipment - Lubricate..................................4-48
Track frame gauge - Spread............................... 3-264 Work equipment - Operate..................................3-206
Track shoe bolt - Check looseness / Tighten........ 4-27 Work equipment control lever............................. 3-107
Track shoes - Select............................................. 6-27 Working lamp - Check.........................................3-162
Track tension - Check........................................... 4-28 Working mode.....................................................3-208
Track tension - Check / Adjust.............................. 4-28 Working mode - Operate.....................................3-208
Track tension - Decrease...................................... 4-29 Working mode display...........................................3-37
Track tension - Increase........................................4-28 Working mode selector switch - Select................. 3-48
Transportation..................................................... 3-250
Transportation method - Select...........................3-250 Y
Travel lever......................................................... 3-107
Your machine serial numbers and distributor..........1-8
Travel motor - Bleed air.........................................4-45
Travel speed display............................................. 3-37
Travel speed selector switch.................................3-51
Troubles and actions...........................................3-271
Tuningtime adjustment button.............................3-244
Turbocharger protection function........................ 3-186

8-7
PC490LC-11 HYDRAULIC EXCAVATOR
Form No. TEN00695-00

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All Right Reserved
Printed in Japan 04-2015