KEAM049700T

D61EX,PX-15
BULLDOZER
SERIAL NUMBERS B40001 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 maintain-
ing 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
2004 Komatsu has Operation & Maintenance Manuals written in
All Right Reserved some other languages. If a foreign language manual is
Printed in Brazz il 07-04 0 necessary, contact your local distributor for availability.
FOREWORD

11
FOREWORD FOREWORD

FOREWORD 1
This manual provides rules and guidelines which will help you use this machine safely and effectively. The pre-
cautions in this manual must be followed at all times when performing operation and maintenance. Most accidents
are caused by the failure to follow fundamental safety rules for the operation and maintenance of machines. Acci-
dents can be prevented by knowing beforehand conditions that may cause a hazard when performing operation
and maintenance.

WARNING
Before beginning operation or maintenance, operators and maintenance personnel must always observe
the following points.

Read this manual thoroughly and understand its contents fully.

Read the safety messages and safety labels given in this manual carefully so that they should be under-
stood fully.

Keep this manual at the storage location for the Operation and Maintenance Manual given below so that
all personnel involved in working on the machine can consult it periodically.

In case this manual should be lost or damaged, immediately contact Komatsu or your Komatsu distributor
to obtain a new copy.

When you sell the machine, make sure that this manual should be provided to the new owner together
with the machine.

In this manual, measurements are expressed in international standard units (SI). For the reference pur-
pose, weight units used in the past are also displayed in { }.

Storage location for the Operation and Maintenance Manual:

If machine is equipped with a cab.

Inside of right and left doors

If machine is not equipped with cab.

Rear face of floor

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FOREWORD FOREWORD

1-3
FOREWORD FOREWORD

1-4
FOREWORD SAFETY INFORMATION

SAFETY INFORMATION 1
To enable you to use this machine safely, safety precautions and labels are given in this manual and affixed to the
machine to give explanations of situations involving potential hazards and of the methods of avoiding such situa-
tions.

Signal words

The following signal words are used to inform you that there is a potential hazardous situation that may lead to per-
sonal injury or damage.

In this manual and on machine labels, the following signal words are used to express the potential level of hazard.

Indicates an imminently hazardous situation which, if not avoided, will result in death or seri-
ous injury.

Indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.

Indicates a potentially hazardous situation which, if not avoided, may result in minor or mod-
erate injury. This word is used also to alert against unsafe practices that may cause prop-
erty damage.

Example of safety message using signal word

WARNING
When standing up from the operator's seat, always place the work equipment lock lever in the LOCK posi-
tion.
If you accidentally touch the control levers when they are not locked, this may cause a serious injury or
death.

Other signal words

In addition to the above, the following signal words are used to indicate precautions that should be followed to pro-
tect the machine or to give information that is useful to know.

This word is used for precautions that must be taken to avoid actions which could shorten
the life of the machine.

This word is used for information that is useful to know.

1-5
SAFETY INFORMATION FOREWORD

q Safety labels

Safety labels are affixed to the machine to inform the operator or maintenance worker on the spot when carrying
out operation or maintenance of the machine that may involve hazard.

This machine uses “Safety labels using words“ and “Safety labels using pictograms“ to indicate safety procedures.

Example of safety label using words

Safety labels using pictogram

Safety pictograms use a picture to express a level of hazard-

ous condition equivalent to the signal word. These safety picto-
grams use pictures in order to let the operator or maintenance
worker understand the level and type of hazardous condition at
all times. Safety pictograms show the type of hazardous condi-
tion at the top or left side, and the method of avoiding the haz-
ardous condition at the bottom or right side. In addition, the
type of hazardous condition is displayed inside a triangle and
the method of avoiding the hazardous condition is shown
inside a circle.

Komatsu cannot predict every circumstance that might involve a potential hazard in operation and maintenance.
Therefore, the safety messages in this manual and on the machine may not include all possible safety precau-
tions.

If any procedures or actions not specifically recommended or allowed in this manual are used, it is your responsi-
bility to take the necessary steps to ensure safety.

In no event should you engage in prohibited uses or actions described in this manual.

The explanations, values, and illustrations in this manual were prepared based on the latest information available
at that time. Continuing improvements in the design of this machine can lead to changes in detail which may not
be reflected in this manual. Consult Komatsu or your Komatsu distributor for the latest available information of
your machine or for questions regarding information in this manual.

The numbers in circles in the illustrations correspond to the numbers in ( ) in the text. (For example: 1 -> (1))

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FOREWORD INTRODUCTION

INTRODUCTION 1
This Komatsu machine is designed to be used mainly for the following work:

q Dozing

q Smoothing

q Cutting into hard or frozen ground or ditching

q Felling trees, removing stumps

See the section “WORK POSSIBLE USING BULLDOZER (3-110)“ for further details.

FRONT/REAR, LEFT/RIGHT DIRECTIONS OF MACHINE 1

(A) Front (E) Operator's seat

(B) Rear (F) Sprocket
(C) Left
(D) Right

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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NECESSARY INFORMATION FOREWORD

NECESSARY INFORMATION 1
When requesting service or ordering replacement parts, please inform your Komatsu distributor of the following
items.

PRODUCT IDENTIFICATION NUMBER (PIN)/MACHINE SERIAL NO. PLATE 1

This is at the front bottom right of the operator's seat.
The design of the nameplate differs according to the territory.

ENGINE SERIAL NO. PLATE 1

This is at the front top of the engine on the left side machine.

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FOREWORD NECESSARY INFORMATION

EMISSION CONTROL INFORMATION LABEL 1

This is at the top on the side face of the engine on the left side of the machine.

POSITION OF SERVICE METER 1

The service meter is provided at the lower part of the monitor
panel.

TABLE OF ENTER SERIAL NO. AND DISTRIBUTOR 1

Machine serial No.

Engine serial No.
Product identification number (PIN)
Distributor name
Address

Service Personnel
Phone/Fax

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CONTENTS

CONTENTS

FOREWORD
FOREWORD......................................................................................................................................................... 1-2

SAFETY INFORMATION...................................................................................................................................... 1-5

INTRODUCTION................................................................................................................................................... 1-7
FRONT/REAR, LEFT/RIGHT DIRECTIONS OF MACHINE ....................................................................... 1-7

NECESSARY INFORMATION ............................................................................................................................. 1-8

PRODUCT IDENTIFICATION NUMBER (PIN)/MACHINE SERIAL NO. PLATE........................................ 1-8
ENGINE SERIAL NO. PLATE..................................................................................................................... 1-8
EMISSION CONTROL INFORMATION LABEL ......................................................................................... 1-9
POSITION OF SERVICE METER .............................................................................................................. 1-9
TABLE OF ENTER SERIAL NO. AND DISTRIBUTOR .............................................................................. 1-9

CONTENTS ........................................................................................................................................................ 1-10

SAFETY
SAFETY ................................................................................................................................................................ 2-2

SAFETY LABELS................................................................................................................................................. 2-4

POSITIONS OF SAFETY PICTOGRAMS .................................................................................................. 2-4
SAFETY LABELS ....................................................................................................................................... 2-5

GENERAL PRECAUTIONS ................................................................................................................................. 2-9

PRECAUTIONS FOR OPERATION ................................................................................................................... 2-18

STARTING ENGINE ................................................................................................................................. 2-18
OPERATION............................................................................................................................................. 2-20
TRANSPORTATION................................................................................................................................. 2-23
BATTERY ................................................................................................................................................. 2-24
TOWING ................................................................................................................................................... 2-26

PRECAUTIONS FOR MAINTENANCE .............................................................................................................. 2-27

OPERATION
GENERAL VIEW .................................................................................................................................................. 3-2
GENERAL VIEW OF MACHINE ................................................................................................................. 3-2
GENERAL VIEW OF CONTROLS AND GAUGES..................................................................................... 3-3

EXPLANATION OF COMPONENTS.................................................................................................................... 3-6

FRONT PANEL........................................................................................................................................... 3-6

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 CONTENTS

CHECK MONITOR SYSTEM ............................................................................................................ 3-7

EMERGENCY CAUTION ITEMS ...................................................................................................... 3-8
CAUTION ITEMS............................................................................................................................. 3-10
METER GROUP .............................................................................................................................. 3-12
LAMPS............................................................................................................................................. 3-17
SWITCHES...................................................................................................................................... 3-19
METHOD OF USING MAINTENANCE MODE................................................................................ 3-24
SWITCHES ............................................................................................................................................... 3-33
CONTROL LEVERS AND PEDALS ......................................................................................................... 3-37
CIRCUIT BREAKER ................................................................................................................................. 3-44
FUSE ........................................................................................................................................................ 3-45
FUSIBLE LINK .......................................................................................................................................... 3-47
ELECTRIC POWER TAKE-OUT ADAPTER ............................................................................................ 3-48
MACHINE EQUIPPED WITH CAB .................................................................................................. 3-48
MACHINE EQUIPPED WITH CANOPY .......................................................................................... 3-48
DOOR - OPEN LOCK ............................................................................................................................... 3-49
SASH GLASS INTERMEDIATE LOCK..................................................................................................... 3-49
CAP, COVER WITH LOCK....................................................................................................................... 3-50
METHOD OF OPENING AND CLOSING CAP WITH LOCK .......................................................... 3-50
METHOD OF OPENING AND CLOSING COVER WITH LOCK ..................................................... 3-51
DOOR POCKET ....................................................................................................................................... 3-52
OPENING AND CLOSING ENGINE SIDE COVER.................................................................................. 3-52
ASHTRAY ................................................................................................................................................. 3-53
TOOL BOX................................................................................................................................................ 3-53
CAR STEREO, HANDLING ...................................................................................................................... 3-54
EXPLANATION OF COMPONENTS............................................................................................... 3-54
METHOD OF OPERATION ............................................................................................................. 3-60
PRECAUTION WHEN USING......................................................................................................... 3-62
AIR CONDITIONER, HANDLING ............................................................................................................. 3-63
GENERAL LOCATIONS AND FUNCTION OF CONTROL PANEL ................................................ 3-63
METHOD OF OPERATION ............................................................................................................. 3-66
PRECAUTION WHEN USING AIR CONDITIONER........................................................................ 3-67
SET SO THAT COLD AIR DOES NOT DIRECTLY BLOW ONTO THE GLASS SURFACE .......... 3-67
INSPECTION DURING OFF-SEASON ........................................................................................... 3-67
PROCEDURE FOR REPLACING RECEIVER ................................................................................ 3-67
CHECK COMPRESSOR BELT TENSION AND REFRIGERANT (GAS) LEVEL............................ 3-67
CLEANING AIR FILTER .................................................................................................................. 3-68
ACCUMULATOR, HANDLING.................................................................................................................. 3-69
METHOD OF RELEASING PRESSURE IN OPERATING CIRCUIT ON MACHINE EQUIPPED WITH
ACCUMULATOR ............................................................................................................................. 3-69

OPERATION....................................................................................................................................................... 3-72
CHECK BEFORE STARTING ENGINE, ADJUST.................................................................................... 3-72
WALK-AROUND CHECK ................................................................................................................ 3-72
CHECK BEFORE STARTING ......................................................................................................... 3-74

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CONTENTS

ADJUSTMENT................................................................................................................................. 3-82
OPERATION AND CHECK BEFORE STARTING ENGINE............................................................ 3-87
STARTING ENGINE ................................................................................................................................. 3-89
NORMAL STARTING ...................................................................................................................... 3-89
STARTING IN COLD WEATHER .................................................................................................... 3-91
OPERATIONS AND CHECKS AFTER STARTING ENGINE ................................................................... 3-94
BREAKING IN THE NEW MACHINE .............................................................................................. 3-94
WARMING UP OPERATIONS ........................................................................................................ 3-94
STARTING IN COLD WEATHER .................................................................................................... 3-95
STOPPING ENGINE................................................................................................................................. 3-97
MACHINE OPERATION ........................................................................................................................... 3-98
MOVING MACHINE......................................................................................................................... 3-98
STOPPING MACHINE................................................................................................................... 3-100
SHIFTING GEARS.................................................................................................................................. 3-101
GEARSHIFTING OPERATION...................................................................................................... 3-101
GEARSHIFTING OPERATION USING PRESET MODE FUNCTION........................................... 3-102
AUTO DOWN SHIFT OPERATION ............................................................................................... 3-103
SHIFTING BETWEEN FORWARD AND REVERSE .............................................................................. 3-104
STEERING MACHINE ............................................................................................................................ 3-106
NORMAL TURNING ...................................................................................................................... 3-106
PRECAUTIONS FOR OPERATION ....................................................................................................... 3-108
PAY ATTENTION TO GAUGES .................................................................................................... 3-108
PERMISSIBLE WATER DEPTH.................................................................................................... 3-108
PRECAUTIONS WHEN TRAVELING UP OR DOWN HILLS........................................................ 3-108
PRECAUTIONS ON SLOPES ....................................................................................................... 3-108
METHOD OF USING BRAKES ..................................................................................................... 3-109
IT IS PROHIBITED TO KEEP THE DOOR OPEN DURING OPERATIONS................................. 3-109
IT IS PROHIBITED TO MODIFY THE CAB GLASS IN ANY WAY THAT WILL OBSTRUCT THE VIEW
3-109
PRECAUTIONS FOR BLIND SPOTS CAUSED BY CAB AND ROPS STRUCTURES ................ 3-109
WORK POSSIBLE USING BULLDOZER ............................................................................................... 3-110
DOZING ......................................................................................................................................... 3-110
SMOOTHING................................................................................................................................. 3-110
CUTTING INTO HARD OR FROZEN GROUND OR DITCHING .................................................. 3-111
FELLING TREES, REMOVING STUMPS ..................................................................................... 3-111
ADUSTING POSTURE OF WORK EQUIPMENT .................................................................................. 3-112
ADJUST ANGLE OF BLADE EDGE.............................................................................................. 3-112
ADJUST AMOUNT OF TILT POWER TILT ................................................................................... 3-113
PARKING MACHINE .............................................................................................................................. 3-114
CHECK AFTER FINISHING WORK ....................................................................................................... 3-115
BEFORE STARTING ENGINE ...................................................................................................... 3-115
AFTER STARTING ENGINE ......................................................................................................... 3-115
LOCKING ................................................................................................................................................ 3-116
TIPS FOR LONGER UNDERCARRIAGE LIFE ...................................................................................... 3-117
OPERATION METHOD ................................................................................................................. 3-117

TRANSPORTATION......................................................................................................................................... 3-118
TRANSPORTATION MEANS ................................................................................................................. 3-118

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 CONTENTS

REMOVING CAB .................................................................................................................................... 3-118

PRECAUTIONS WHEN REMOVING WORK EQUIPMENT................................................................... 3-118
POWER ANGLE, POWER TILTDOZER ....................................................................................... 3-118
POWER TILTDOZER .................................................................................................................... 3-118
PRECAUTIONS WHEN REMOVING ROPS .......................................................................................... 3-119
LOADING, UNLOADING WORK ............................................................................................................ 3-120
LIFTING MACHINE................................................................................................................................. 3-124

COLD WEATHER OPERATION ...................................................................................................................... 3-128

PRECAUTIONS FOR LOW TEMPERATURE ........................................................................................ 3-128
AFTER COMPLETION OF WORK ......................................................................................................... 3-130
AFTER COLD WEATHER ...................................................................................................................... 3-130

LONG-TERM STORAGE.................................................................................................................................. 3-131

BEFORE STORAGE............................................................................................................................... 3-131
DURING STORAGE ............................................................................................................................... 3-131
AFTER STORAGE.................................................................................................................................. 3-131

TROUBLESHOOTING...................................................................................................................................... 3-132
AFTER RUNNING OUT OF FUEL.......................................................................................................... 3-132
MACHINE TOWING METHOD ............................................................................................................... 3-132
WHEN IT IS POSSIBLE TO START ENGINE............................................................................... 3-133
WHEN ENGINE DOES NOT START ............................................................................................ 3-134
IF BATTERY IS DISCHARGED.............................................................................................................. 3-138
REMOVE AND INSTALL BATTERY ............................................................................................. 3-138
PRECAUTIONS FOR BATTERY CHARGING .............................................................................. 3-139
STARTING ENGINE WITH BOOSTER CABLE ............................................................................ 3-139
OTHER TROUBLE ................................................................................................................................. 3-142
ELECTRICAL SYSTEM................................................................................................................. 3-142
MONITOR PANEL ......................................................................................................................... 3-143
CHASSIS ....................................................................................................................................... 3-144
ENGINE ......................................................................................................................................... 3-145

MAINTENANCE
GUIDE TO MAINTENANCE ................................................................................................................................. 4-2

OUTLINE OF SERVICE........................................................................................................................................ 4-5

OUTLINE OF OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC .................................................. 4-5
OIL ..................................................................................................................................................... 4-5
FUEL.................................................................................................................................................. 4-5
COOLANT ......................................................................................................................................... 4-6
GREASE............................................................................................................................................ 4-6
CARRYING OUT KOWA (Komatsu Oil Wear Analysis) .................................................................... 4-6
STORING OIL AND FUEL................................................................................................................. 4-7
FILTERS ............................................................................................................................................ 4-7
RELATING TO ELECTRIC SYSTEM ......................................................................................................... 4-8

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CONTENTS

WEAR PARTS LIST ............................................................................................................................................. 4-9

WEAR PARTS LIST.................................................................................................................................... 4-9

USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE..................... 4-10

PROPER SELECTION OF FUEL, COOLANT AND LUBRICANTS ......................................................... 4-10

STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS..................................................................... 4-14

TORQUE LIST .......................................................................................................................................... 4-14

PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS .......................................................................... 4-15

SAFETY CRITICAL PARTS...................................................................................................................... 4-15

MAINTENANCE SCHEDULE CHART ............................................................................................................... 4-17

MAINTENANCE SCHEDULE CHART ...................................................................................................... 4-17
WHEN REQUIRED.......................................................................................................................... 4-17
CHECK BEFORE STARTING ......................................................................................................... 4-17
EVERY 50 HOURS SERVICE ......................................................................................................... 4-17
EVERY 250 HOURS SERVICE ....................................................................................................... 4-17
EVERY 500 HOURS SERVICE ....................................................................................................... 4-17
EVERY 1000 HOURS SERVICE ..................................................................................................... 4-18
EVERY 2000 HOURS SERVICE ..................................................................................................... 4-18
EVERY 4000 HOURS SERVICE ..................................................................................................... 4-18

SERVICE PROCEDURE .................................................................................................................................... 4-19

WHEN REQUIRED ................................................................................................................................... 4-19
CHECK, CLEAN AND REPLACE AIR CLEANER ELEMENT ......................................................... 4-19
CLEAN INSIDE OF COOLING SYSTEM ........................................................................................ 4-23
CHECK TRACK SHOE TENSION, ADJUST ................................................................................... 4-26
CHECK AND TIGHTEN TRACK SHOE BOLTS.............................................................................. 4-28
CHECK ELECTRICAL INTAKE AIR HEATER ................................................................................ 4-28
REVERSE AND REPLACE END BITS AND CUTTING EDGES..................................................... 4-29
CLEAN, CHECK RADIATOR FINS ................................................................................................. 4-31
CHECK, ADJUST AIR CONDITIONER ........................................................................................... 4-33
GREASE DOOR HINGE.................................................................................................................. 4-34
CHECK DOOR LOCK STRIKER ..................................................................................................... 4-34
REPLACE DOOR DAMPER ............................................................................................................ 4-34
CHECK DOOR LATCH.................................................................................................................... 4-35
CHECK WINDOW WASHER FLUID LEVEL, ADD FLUID .............................................................. 4-35
REPLACE WIPER BLADE .............................................................................................................. 4-36
CHECK IDLER OIL LEVEL, ADD OIL ............................................................................................. 4-37
ADJUST IDLER CLEARANCE ........................................................................................................ 4-38
CHECK LINK PITCH ....................................................................................................................... 4-38
CHECK OUTSIDE DIAMETER OF TRACK ROLLER ..................................................................... 4-39
CHECK HEIGHT OF GROUSER .................................................................................................... 4-39
ADJUST PLAY IN CENTER BALL .................................................................................................. 4-40
LUBRICATING UNIVERSAL JOINT ................................................................................................ 4-41
PROCEDURE FOR BLEEDING AIR IN HYDRAULIC SYSTEM ..................................................... 4-42
PROCEDURE FOR RELEASING INTERNAL PRESSURE OF HYDRAULIC SYSTEM................. 4-42
CHECK BEFORE STARTING .................................................................................................................. 4-43

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 CONTENTS

EVERY 50 HOURS SERVICE .................................................................................................................. 4-44

DRAIN WATER, SEDIMENT FROM FUEL TANK........................................................................... 4-44
LUBRICATING................................................................................................................................. 4-44
EVERY 250 HOURS SERVICE ................................................................................................................ 4-45
LUBRICATING................................................................................................................................. 4-45
GREASE EQUALIZER BAR SIDE PIN............................................................................................ 4-47
GREASE EQUALIZER BAR CENTER PIN ..................................................................................... 4-47
CHECK OIL LEVEL IN FINAL DRIVE CASE, ADD OIL .................................................................. 4-48
CHECK OIL LEVEL IN HYDRAULIC TANK, ADD OIL.................................................................... 4-48
CHECK LEVEL OF BATTERY ELECTROLYTE ............................................................................. 4-49
CLEAN WATER SEPARATOR STRAINER .................................................................................... 4-51
CHECK BRAKE PERFORMANCE .................................................................................................. 4-52
CHECK AIR CONDITIONER COMPRESSOR BELT TENSION, ADJUST ..................................... 4-53
CLEAN AIR CONDITIONER AIR FILTER (FRESH/RECIRC FILTER) ........................................... 4-54
EVERY 500 HOURS SERVICE ................................................................................................................ 4-55
REPLACE FUEL FILTER CARTRIDGE .......................................................................................... 4-55
CHANGE OIL IN ENGINE OIL PAN, REPLACE ENGINE OIL FILTER CARTRIDGE .................... 4-56
REPLACE CORROSION RESISTOR CARTRIDGE ....................................................................... 4-57
REPLACE POWER TRAIN OIL FILTER ELEMENT ....................................................................... 4-57
EVERY 1000 HOURS SERVICE .............................................................................................................. 4-58
CHANGE OIL IN POWER TRAIN CASE, CLEAN STRAINERS (POWER TRAIN STRAINER,
SCAVENGING PUMP STRAINER) ................................................................................................. 4-58
CHECK OIL LEVEL IN DAMPER CASE, ADD OIL ......................................................................... 4-60
CHANGE OIL IN FINAL DRIVE CASE ............................................................................................ 4-61
CLEAN BREATHER ........................................................................................................................ 4-61
CHECK ALL TIGHTENING PARTS OF TURBOCHARGER ........................................................... 4-62
CHECK PLAY OF TURBOCHARGER ROTOR .............................................................................. 4-62
CHECK FOR LOOSE ROPS MOUNT BOLTS ................................................................................ 4-62
EVERY 2000 HOURS SERVICE .............................................................................................................. 4-63
CHANGE OIL IN HYDRAULIC TANK, REPLACE OIL FILTER ELEMENT..................................... 4-63
REPLACE HYDRAULIC TANK BREATHER ELEMENT ................................................................. 4-64
CHANGE OIL IN DAMPER CASE................................................................................................... 4-65
CLEAN, CHECK TURBOCHARGER............................................................................................... 4-66
CHECK VIBRATION DAMPER ....................................................................................................... 4-66
CHECK ALTERNATOR, STARTING MOTOR ................................................................................ 4-66
CHECK ENGINE VALVE CLEARANCE, ADJUST.......................................................................... 4-66
EVERY 4000 HOURS SERVICE .............................................................................................................. 4-67
CHECK WATER PUMP................................................................................................................... 4-67

SPECIFICATIONS
SPECIFICATIONS ................................................................................................................................................ 5-2

ATTACHMENTS, OPTIONS
GENERAL PRECAUTIONS ................................................................................................................................. 6-2

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CONTENTS

PRECAUTIONS RELATED TO SAFETY ................................................................................................... 6-2

HANDLING HYDRAULIC RIPPER....................................................................................................................... 6-3

GENERAL VIEW......................................................................................................................................... 6-3
EXPLANATION OF COMPONENTS .......................................................................................................... 6-4
OPERATION............................................................................................................................................... 6-5
CHECK BEFORE STARTING ENGINE, ADJUST............................................................................. 6-5
PRECAUTIONS WHEN OPERATING............................................................................................... 6-5
ADJUSTING POSTURE OF WORK EQUIPMENT............................................................................ 6-5
TROUBLESHOOTING ................................................................................................................................ 6-7
OTHER TROUBLE ............................................................................................................................ 6-7
MAINTENANCE.......................................................................................................................................... 6-8
EVERY 250 HOURS SERVICE ......................................................................................................... 6-8
SPECIFICATIONS ...................................................................................................................................... 6-8

AIR SUSPENSION SEAT..................................................................................................................................... 6-9

DELUXE SEAT ................................................................................................................................................... 6-12

HEADREST ........................................................................................................................................................ 6-14

EQUIPPING FIRE EXTINGUISHER AND FIRST-AID KIT................................................................................. 6-15

INDEX

COLOPHON

1-16
SAFETY

12
SAFETY SAFETY

SAFETY 2
SAFETY LABELS................................................................................................................................................ 2-42
POSITIONS OF SAFETY PICTOGRAMS ................................................................................................... 2-42
SAFETY LABELS......................................................................................................................................... 2-52

GENERAL PRECAUTIONS

Safety rules .................................................................................................................................................. 2-92

If abnormalities are found............................................................................................................................. 2-92
Clothing and personal protective items ........................................................................................................ 2-92
Fire extinguisher and first aid kit .................................................................................................................. 2-92
Safety features ........................................................................................................................................... 2-102
Keep machine clean................................................................................................................................... 2-102
Inside operator's compartment................................................................................................................... 2-102
Always apply lock when leaving operator's seat ........................................................................................ 2-102
Handrails and steps ................................................................................................................................... 2-112
Mounting and dismounting ......................................................................................................................... 2-112
No people on attachments ......................................................................................................................... 2-122
Crushing or cutting prevention ................................................................................................................... 2-122
Prevention of burns .................................................................................................................................... 2-122
Fire prevention ........................................................................................................................................... 2-132
Action if fire occurs..................................................................................................................................... 2-142
Window washer liquid ................................................................................................................................ 2-142
Precautions when using ROPS (Roll Over Protective Structure)............................................................... 2-142
Precautions for attachments ...................................................................................................................... 2-142
Unauthorized modification.......................................................................................................................... 2-142
Safety at worksite....................................................................................................................................... 2-152
Working on loose ground ........................................................................................................................... 2-152
Do not go close to high-voltage cables ...................................................................................................... 2-152
Ensure good visibility ................................................................................................................................. 2-162
Ventilation for enclosed areas.................................................................................................................... 2-162
Checking signalman's signals and signs.................................................................................................... 2-162
Emergency exit from operator's cab .......................................................................................................... 2-162
Be careful about asbestos dust.................................................................................................................. 2-172
PRECAUTIONS FOR OPERATION ................................................................................................................. 2-182
STARTING ENGINE .................................................................................................................................. 2-182
Checks before starting engine ............................................................................................................ 2-182
Precautions when starting................................................................................................................... 2-182
Precautions in cold areas.................................................................................................................... 2-192
OPERATION .............................................................................................................................................. 2-202
Checks before operation..................................................................................................................... 2-202
Precautions for moving machine forward or in reverse....................................................................... 2-202
Precautions when traveling ................................................................................................................. 2-202
Traveling on slopes ............................................................................................................................. 2-212
Using brakes ....................................................................................................................................... 2-212
Operate carefully on snow .................................................................................................................. 2-222
Parking machine ................................................................................................................................. 2-222
TRANSPORTATION .................................................................................................................................. 2-232
Loading and unloading........................................................................................................................ 2-232
Shipping .............................................................................................................................................. 2-232
BATTERY................................................................................................................................................... 2-242
Battery hazard prevention................................................................................................................... 2-242
Starting with booster cable.................................................................................................................. 2-252
TOWING .................................................................................................................................................... 2-262
When towing ....................................................................................................................................... 2-262

2-2
SAFETY SAFETY

PRECAUTIONS FOR MAINTENANCE ............................................................................................................ 2-272

Warning tag................................................................................................................................................ 2-272
Keep work place clean and tidy ................................................................................................................. 2-272
Appoint leader when working with others .................................................................................................. 2-272
Stop engine before carrying out inspection and maintenance ................................................................... 2-272
Two workers for maintenance when engine is running.............................................................................. 2-282
Proper tools................................................................................................................................................ 2-292
No unauthorized personnel into area......................................................................................................... 2-292
Attachments ............................................................................................................................................... 2-292
Work under the machine............................................................................................................................ 2-302
Noise.......................................................................................................................................................... 2-302
Precautions when using hammer............................................................................................................... 2-302
Repair welding ........................................................................................................................................... 2-302
Removing battery terminal ......................................................................................................................... 2-302
Precautions when using high-pressure grease to adjust track tension...................................................... 2-312
Do not disassemble recoil spring ............................................................................................................... 2-312
Precaution with high-pressure oil............................................................................................................... 2-312
Handling high-pressure hoses ................................................................................................................... 2-322
Waste material ........................................................................................................................................... 2-322
Maintenance for air conditioner.................................................................................................................. 2-322
Compressed air.......................................................................................................................................... 2-322
Periodic replacement of safety critical parts .............................................................................................. 2-322

2-3
SAFETY LABELS SAFETY

SAFETY LABELS 2
The following warning signs and safety labels are used on this machine.

q Be sure that you fully understand the correct position and content of labels.

q To ensure that the content of labels can be read properly, be sure that they are in the correct place and always
keep them clean. When cleaning them, do not use organic solvents or gasoline. These may cause the labels
to peel off.
q There are also other labels in addition to the warning signs and safety labels. Handle those labels in the same
way.

q If the labels are damaged, lost, or cannot be read properly, replace them with new ones. For details of the part
numbers for the labels, see this manual or the actual label, and place an order with Komatsu distributor.

POSITIONS OF SAFETY PICTOGRAMS 2

2-4
SAFETY SAFETY LABELS

SAFETY LABELS 2
(1) Caution before operating or maintaining machine
(09651-03001)

(2) Caution before moving in reverse (09802-13000)

(3) Caution for leaving operator's seat (09654-33001)

2-5
SAFETY LABELS SAFETY

(4) Caution for high-temperature cooling water

(09668-03001)

(5) Caution for high-temperature oil (09653-03001)

(6) Caution for accumulator (09659-53000)

(7) Caution for adjusting track tension (09657-03003)

The safety label is attached to the rear side of the track adjust-
ment window cover.

2-6
SAFETY SAFETY LABELS

(8) Caution for battery cable (09808-03000)

(9) Precautions when handling battery

(10) Caution for engine running (09667-03001)

(11) Caution for approach when machine moving

(09812-13000)

2-7
SAFETY LABELS SAFETY

(12) Prohibition of jump start (09842-A0481)

(13) Caution for ROPS (09620-B2000)

(14) Caution for FOPS (09620-C2000)

2-8
SAFETY GENERAL PRECAUTIONS

GENERAL PRECAUTIONS 2
SAFETY RULES

q Only trained and authorized personnel can operate and maintain the machine.

q Follow all safety rules, precautions and instructions when operating or performing maintenance on the
machine.
q If you are under the influence of alcohol or medication, your ability to safely operate or repair your machine
may be severly impaired putting yourself and everyone else on your jobsite in danger.

q When working with another operator or with a person on worksite traffic duty, be sure that all personnel under-
stand all hand signals that are to be used.

IF PROBLEMS ARE FOUND

If you find any problems 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 person in
charge and have the necessary action taken. Do not operate the machine until the problem has been corrected.

CLOTHING AND PERSONAL PROTECTIVE ITEMS

q Do not wear loose clothing and accessories. There is a hazard that they may catch on control levers or other
protruding parts.

q If you have long hair and it hangs out from your hard hat,
there is a hazard that it may get caught up in the machine,
so tie your hair up and be careful not to let it get caught.

q Always wear a hard hat and safety shoes. If the nature of

the work requires it, wear safety glasses, mask, gloves, ear
plugs, and safety belt when operating or maintaining the
machine.

q Check that all protective equipment functions properly

before using it.

FIRE EXTINGUISHER AND FIRST AID KIT

Always follow the precautions below to prepare for action if any injury or fire should occur.

q Be sure that fire extinguishers have been provided and

read the labels to ensure that you know how to use them in
emergencies.

q Carry out periodic inspection and maintenance to ensure

that the fire extinguisher can always be used.

q Provide a first aid kit at the storage point. Carry out peri-
odic checks and add to the contents if necessary.

2-9
GENERAL PRECAUTIONS SAFETY

SAFETY FEATURES

q Be sure that all guards and covers are in their proper position. Have guards and covers repaired immediately if
they are damaged.

q Understand the method of use of safety features and use them properly.

q Never remove any safety features. Always keep them in good operating condition.

KEEP MACHINE CLEAN

q If water gets into the electrical system, there is a hazard

that it will cause malfunctions or misoperation. Do not use
water or steam to wash the electrical system (sensors,
connectors).
q If inspection and maintenance is carried out when the
machine is still dirty with mud or oil, there is a hazard that
you will slip and fall, or that dirt or mud will get into your
eyes. Always keep the machine clean.

INSIDE OPERATOR'S COMPARTMENT

q 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 serious
accident.

q Do not leave parts or tools lying around the operator's compartment.

q Do not stick suction pads to the window glass. Suction pads act as a lens and may cause fire.

q Do not use cellular telephones inside the operator's compartment when driving or operating the machine.
q Never bring any dangerous objects such as flammable or explosive items into the operator's compartment.

ALWAYS APPLY LOCK WHEN LEAVING OPERATOR'S SEAT

q Before standing up from the operator's seat (such as when

adjusting the operator's seat), lower the work equipment
completely to the ground, set work equipment lock lever (1)
and parking brake lever (2) securely to the LOCK position
(L), then stop the engine.

If you accidentally touch the levers when they are not

locked, there is a hazard that the machine may suddenly
move and cause serious injury or property damage.
q When leaving the machine, always lower the work equip-
ment completely to the ground, set work equipment lock
lever (1) and parking brake lever (2) securely to the LOCK
position (L), then stop the engine. Use the key to lock all
the equipment. Always remove the key, take it with you,
and keep it in the specified place.

2-10
SAFETY GENERAL PRECAUTIONS

HANDRAILS AND STEPS

To prevent personal injury caused by slipping or falling off the machine, always do as follows.
q Use the handrails and steps marked by arrows (A) in the diagram when getting on or off the machine.

q The handrail marked by arrow (B) in the diagram is provided to support yourself when refilling the fuel tank
with the fuel. Do not use it for getting on or off the machine.

For power angle, power tiltdozer

For power tiltdozer

q To ensure safety, always face the machine and maintain

three-point contact (both feet and one hand, or both hands
and one foot) with the handrails and steps (including the
track shoe) to ensure that you support yourself.

q Do not grip the control levers, work equipment lock lever,

or parking brake lever when getting on or off the machine.

q Never climb on the engine hood or covers where there are

no non-slip pads.

q Before getting on or off the machine, check the handrails

and steps (including the track shoe). If there is any oil,
grease, or mud on the handrails or steps (including the
track shoe), wipe it off immediately. Always keep these
parts clean. Repair any damage and tighten any loose
bolts.

q Do not get on or off the machine while holding tools in your

hand.

MOUNTING AND DISMOUNTING

q Never jump on or off the machine. Never get on or off a moving machine.

q 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.

2-11
GENERAL PRECAUTIONS SAFETY

NO PEOPLE ON ATTACHMENTS

Never let anyone ride on the work equipment, or other attachments. There is a hazard of falling and suffering seri-
ous injury.

CRUSHING OR CUTTING PREVENTION

The clearance around the work equipment will change according to the movement of the link. If you get caught,
this may lead to serious personal injury. Do not allow anyone to approach any rotating or telescoping part.

PREVENTION OF BURNS

Hot coolant

q To prevent burns from hot water or steam spurting out

when checking or draining the coolant, wait for the water to
cool to a temperature where it is possible to touch the radi-
ator cap by hand before starting the operation. Even when
the coolant has cooled down, loosen the cap slowly to
relieve the pressure inside the radiator before removing the
cap.

Hot oil

q To prevent burns from hot oil spurting out when checking or

draining the oil, wait for the oil to cool to at temperature
where it is possible to touch the cap or plug by hand before
starting the operation. Even when the oil has cooled down,
loosen the cap or plug slowly to relieve the internal pres-
sure before removing the cap or plug.

2-12
SAFETY GENERAL PRECAUTIONS

FIRE PREVENTION

q Fire caused by fuel or oil

Fuel, oil, antifreeze, and window washer liquid are particu-

larly flammable and can be hazardous. To prevent fire,
always observe the following:

q Do not smoke or use any flame near fuel or oil.

q Stop the engine before refueling.

q Do not leave the machine while adding fuel or oil.

q Tighten all fuel and oil caps securely.

q Do not spill fuel on overheated surfaces or on parts of
the electrical system.

q Use well-ventilated areas for adding or storing oil and

fuel.

q Keep oil and fuel in the determined place and do not

allow unauthorized persons to enter.
q After adding fuel or oil, wipe up any spilled fuel or oil.

q When carrying out grinding or welding work on the

chassis, move any flammable materials to a safe place
before starting.

q When washing parts with oil, use a non-flammable oil.

Diesel oil and gasoline may catch fire, so do not use
them.

q Put greasy rags and other flammable materials into a

safe container to maintain safety at the work place.

q Do not weld or use a cutting torch to cut any pipes or

tubes that contain flammable liquids.

q Fire caused by accumulation of flammable material.

Remove any dry leaves, chips, pieces of paper, dust, or any other flammable materials accumulated or affixed
around the engine, exhaust manifold, muffler, or battery, or inside the undercovers.

q Fire coming from electric wiring

Short circuits in the electrical system can cause fire.

q Always keep electric wiring connections clean and securely tightened.

q Check the wiring every day for looseness or damage. Tighten any loose connectors or wiring clamps.
Repair or replace any damaged wiring.

q Fire coming from hydraulic line

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. This may lead to damage to
the hoses, and cause high-pressure oil to spurt out, leading to fire damage or serious injury.

2-13
GENERAL PRECAUTIONS SAFETY

q Explosion caused by lighting equipment

q When checking fuel, oil, battery electrolyte, window washer fluid, or coolant, always use lighting with anti-
explosion specifications. If such lighting equipment is not used, there is danger of explosion that may
cause serious injury.

q When taking the electrical power for the lighting from the machine itself, follow the instructions in this man-
ual.

ACTION IF FIRE OCCURS

If a fire occurs, escape from the machine as follows.

q Turn the start switch OFF to stop the engine.

q Use the handrails and steps to get off the machine.

WINDOW WASHER LIQUID

Use an ethyl alcohol base washer liquid.

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

PRECAUTIONS WHEN USING ROPS

Install ROPS when working in places where there is danger of

falling rocks, such as in mines and quarries, or in places where
there is danger of rolling over.

q If ROPS is installed, do not remove it when operating the

machine.

q ROPS is installed to protect the operator when machine

rolls over. When machine rolls over, ROPS supports its
weight and absorbs its impact energy.

q If ROPS is modified, its strength may be reduced. When

modifying, consult your Komatsu distributor.

q If ROPS 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 Komatsu contact your distributor for advice of the
method of repair.

Even if ROPS is installed, always fasten your seat belt properly when operating the machine. If you do not use
your fasten your seat belt properly, it cannot display its effect.

PRECAUTIONS FOR ATTACHMENTS

q When installing optional parts or attachments, there may be problems with safety or legal restrictions. There-
fore contact your Komatsu distributor for advice.

q Any injuries, accidents, or product failures resulting from the use of unauthorized attachments or parts will not
be the responsibility of Komatsu.

q When installing and using optional attachments, read the instruction manual for the attachment, and the gen-
eral information related to attachments in this manual.

UNAUTHORIZED MODIFICATION

Any modification made without authorization from Komatsu can create hazards. Before making a modification,
consult your Komatsu distributor.

q Komatsu will not be responsible for any injuries, accidents, product failures or other property damages result-
ing from modifications made without authorization from Komatsu.

2-14
SAFETY GENERAL PRECAUTIONS

SAFETY AT WORKSITE

Before starting operations, thoroughly check the area for any unusual conditions that could be dangerous.
q When carrying out operations near combustible materials such as thatched roofs, dry leaves or dry grass,
there is a hazard of fire, so be careful when operating.

q Check the terrain and condition of the ground at the worksite, and determine the safest method of operation.
Do not carry out operations at places where there is a hazard of landslides or falling rocks.

q If water lines, gas lines, or high-voltage electrical lines may

be buried under the worksite, contact each utility and iden-
tify their locations. Be careful not to sever or damage any
of these lines.

q Take action to prevent unauthorized people from approach-

ing the jobsite.

When working on public roads, position flagmen and erect

barriers to ensure the safety of passing traffic and pedestri-
ans.

q When traveling or operating in shallow water or on soft

ground, check the shape and condition of the bedrock, and
the depth and speed of flow of the water before starting
operations.

WORKING ON LOOSE GROUND

q Avoid traveling or operating your machine too close to the edge of cliffs, overhangs, 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 after heavy rain or blasting or
after earthquakes is weak in these areas.

q 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.

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 injury or property damage. On jobsites where the machine may go close to electric cables, always do as
follows.

q 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.

q Even going close to high-voltage cables can cause electric

shock, which may cause serious burns or even death. Voltage of Cables Safety Distance
Always maintain a safe distance (see the table on the right) 100 V - 200 V Over 2 m (7 ft)
between the machine and the electric cable. Check with 6,600 V Over 2 m (7 ft)
the local power company about safe operating procedure 22,000 V Over 3 m (10 ft)
before starting operations.
66,000 V Over 4 m (14 ft)
q To prepare for any possible emergencies, wear rubber 154,000 V Over 5 m (17 ft)
shoes and gloves. Lay a rubber sheet on top of the seat, 187,000 V Over 6 m (20 ft)
and be careful not to touch the chassis with any exposed 275,000 V Over 7 m (23 ft)
part of your body.
500,000 V Over 11 m (36 ft)
q Use a signalman to give warning if the machine
approaches too close to the electric cables.

q When carrying out operations near high voltage cables, do

not let anyone come close to the machine.

2-15
GENERAL PRECAUTIONS SAFETY

q 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, do not let anyone come close to the machine.

ENSURE GOOD VISIBILITY

Check for any persons or obstacles in the area around the machine and check the conditions of the jobsite to
ensure that operations and travel can be carried out safely. Always do as follows.

q Position a signalman if there are areas at the rear of the machine where the visibility is not good.

q When working in dark places, turn on the working lamp and front lamps installed to the machine, and set up
additional lighting in the work area if necessary.

q Stop operations if the visibility is poor, such as in mist, snow, rain, or dust.

VENTILATION FOR ENCLOSED AREAS

Exhaust fumes from the engine can kill.

q If it is necessary to start the engine within an enclosed

area, or when handling fuel, flushing oil, or paint, open the
doors and windows to ensure that adequate ventilation is
provided to prevent gas poisoning.

CHECKING SIGNALMAN'S SIGNALS AND SIGNS

q Set up signs to inform of road shoulders and soft ground. If the visibility is not good, position a signalman if
necessary. Operators should pay careful attention to the signs and follow the instructions from the signalman.

q Only one signalman should give signals.

q Make sure that all workers understand the meaning of all signals and signs before starting work.

EMERGENCY EXIT FROM OPERATOR'S CAB

Machines equipped with a cab have doors on the left and right sides. If the door on the one side does not open,
escape from the door on the other side.

2-16
SAFETY GENERAL PRECAUTIONS

BE CAREFUL ABOUT ASBESTOS DUST

Asbestos dust in the air can cause lung cancer if it is inhaled.

There is danger of inhaling asbestos when working on jobsites
handling demolition work or work handling industrial waste.
Always observe the following.

q Spray water to keep down the dust when cleaning. Do not

use compressed air for cleaning.

q If there is danger that there may be asbestos dust in the

air, always operate the machine from an upwind position.
All workers should use an approved respirator.

q Do not allow other persons to approach during the opera-

tion.

q Always observe the rules and regulations for the work site
and environmental standards.

This machine does not use asbestos, but there is a danger that imitation parts may contain asbestos, so always
use genuine Komatsu parts.

2-17
PRECAUTIONS FOR OPERATION SAFETY

PRECAUTIONS FOR OPERATION 2

STARTING ENGINE 2
If there is a warning tag hanging from the work equipment con-
trol lever, do not start the engine or touch the levers .

CHECKS BEFORE STARTING ENGINE

Carry out the following checks before starting the engine at the beginning of the day's work.

q Remove all dirt from the surface of the window glass to ensure a good view.

q Remove all dirt from the surface of the lens of the front lamps and working lamps, and check that they light up
correctly.

q 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.

q Adjust the operator's seat to a position where it is easy to carry out operations, and check that there is no dam-
age or wear to the seat belt or mounting clamps.

q Check that the gauges work properly, check the angle of the lights and working lamps, and check that the con-
trol levers are all at the neutral position.

q Adjust the mirror to a position which gives a good view to the rear from the operator's seat.

q Check that there are no persons or obstacles above, below, or in the area around the machine.

PRECAUTIONS WHEN STARTING

q Start and operate the machine only while seated.

q Do not attempt to start the engine by short-circuiting the engine starting circuit. Such an act may cause a seri-
ous bodily injury or fire.

q When starting the engine, sound the horn as a warning.

q Do not allow anyone apart from the operator to ride on the machine.

2-18
SAFETY PRECAUTIONS FOR OPERATION

PRECAUTIONS IN COLD AREAS

q Carry out the warming-up operation thoroughly. If the machine is not thoroughly warmed up before the control
levers are operated, the reaction of the machine will be slow, and this may lead to unexpected accidents.

q 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.

2-19
PRECAUTIONS FOR OPERATION SAFETY

OPERATION 2
CHECKS BEFORE OPERATION

When carrying out the checks, move the machine to a wide area where there are no obstructions, and operate
slowly. Do not allow anyone near the machine.

q Always fasten your seat belt.

q Check the operation of travel, steering and brake systems,

and work equipment control system.

q Check for any abnormality in the sound of the machine,

vibration, heat, smell, or gauges; check also that there is
no leakage of oil or fuel.

q If any abnormality is found, carry out repairs immediately.

PRECAUTIONS FOR MOVING MACHINE FORWARD OR IN REVERSE

q Before travelling, check again that there is no one in the

surrounding area, and that there are no obstacles.
q Before travelling, sound the horn to warn people in the
area.

q Always operate the machine only when seated.

q Do not allow anyone apart from the operator to ride on the

machine.

q Check that the back-up alarm (alarm buzzer when machine

travels in reverse) works properly.

q Fix the operator's compartment doors and windows in posi-

tion securely.

q If there is an area to the rear of the machine which cannot

be seen, position a signal person. Take special care not to
hit other machines or people when turning or swinging the
machine.

Always be sure to carry out the above precautions even when the machine is equipped with mirrors.

PRECAUTIONS WHEN TRAVELING

q When traveling on level ground, keep the work equipment

at a height of 40 to 50 cm (1.6 to 2.0 in) from the ground.

q When traveling on rough ground, travel at low speed and

do not operate the steering suddenly. There is danger that
the machine may turn over. The work equipment may hit
the ground surface and cause the machine to lose its bal-
ance, or may damage the machine or structures in the
area.

2-20
SAFETY PRECAUTIONS FOR OPERATION

q Avoid traveling over obstacles when possible. If the

machine has to travel over an obstacle, keep the work
equipment close to the ground and travel at low speed.
Never travel over obstacles which make the machine tilt
strongly to one side.
q When traveling or carrying out operations, always keep a
safe distance from people, structures, or other machines to
avoid coming into contact with them.

q When passing over bridges or structures, check first that

the structure is strong enough to support the weight of the
machine. When traveling on public roads, check first with
the relevant authorities and follow their instructions.

q 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 work equip-
ment hit anything.

q Do not approach the edge of a cliff carelessly. When dropping soil over a cliff for banking or reclamation, leave
soil of one scoop at the edge of the cliff and push it with the next scoop.

q When the machine passes over the top of a hill or when a load is dumped over a cliff, the load is suddenly
reduced, and there is danger that the travel speed rises suddenly. To prevent this, lower the travel speed.

q If the machine moves with only either side of the blade loaded, its tail may swing. Take care.

TRAVELING ON SLOPES

To prevent the machine from tipping over or slipping to the side, always do as follows.

q Keep the work equipment approx. 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 the
machine.

q Always travel straight up or down a slope. Traveling at an

angle or across the slope is extremely dangerous.

q Do not turn on slopes or travel across slopes. Always go

down to a flat place to change the position of the machine,
then travel on to the slope again.

q Travel on grass, fallen leaves, or wet steel plates with low

speed. Even with slight slopes there is a hazard that the
machine may slip.

q When traveling down a slope, always place the transmis-

sion in low speed and travel down the slope slowly.

q When traveling downhill, never shift gear or place the transmission at neutral. It is dangerous not to use the
braking force of the engine. Always place the transmission in a low gear before starting to travel downhill.

USING BRAKES
q When the machine is traveling, do not rest your foot on the brake pedal. If you travel with your foot resting on
the pedal, the brake will always be applied, and this will cause the brakes to overheat and fail.

q Do not depress the brake pedal repeatedly if not necessary. If this is neglected, the brake will be overheated
and will not work when required.

q When traveling downhill, use the braking force of the engine. If necessary, use the brake pedal at the same
time.

2-21
PRECAUTIONS FOR OPERATION SAFETY

OPERATE CAREFULLY ON SNOW

q Snow-covered or frozen surfaces are slippery, so be extremely careful when traveling or operating the
machine, and do not operate the levers suddenly. Even a slight slope may cause the machine to slip, so be
particularly careful when working on slopes.

q With frozen ground surfaces, the ground becomes soft when the temperature rises, and this may cause the
machine to tip over.

q If the machine enters deep snow, there is a hazard that it may tip over or become buried in the snow. Be care-
ful not to leave the road shoulder or to get trapped in a snow drift.

q When clearing snow, the road shoulder and objects placed beside the road are buried in the snow and cannot
be seen. There is a hazard of the machine tipping over or hitting covered objects, so always carry out opera-
tions carefully.

q When traveling on snow-covered slopes, never apply the brakes suddenly. Reduce the speed and use the
engine as a brake while appling the foot brake intermittently (depress the brake intermittently several times). If
necessary, lower the blade to the ground to stop the machine.

PARKING MACHINE

q Park the machine on firm, level ground.

q Select a place where there is no hazard of falling rocks or

landslides, or of flooding if the land is low.

q Lower the work equipment completely to the ground.

q When leaving the machine, set the steering, forward-

reverse, gear shift lever in the NEUTRAL position and set
the blade control lever in the HOLD position.

Next, set both work equipment lock lever (1) and parking
brake lever (2) to LOCK position (L), then stop the engine.

q Always close the operator's cab door, and use the key to
lock all the equipment in order to prevent any unauthorized
person from moving the machine. Always remove the key,
take it with you, and leave it in the specified place.

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

as follows.

q Set the blade on the downhill side, then dig it into the
ground.
q Put blocks under the tracks to prevent the machine
from moving.

2-22
SAFETY PRECAUTIONS FOR OPERATION

TRANSPORTATION 2
The machine can be divided into parts for transportation, so when transportating the machine, please contact your
Komatsu distributor to have the work carried out.

LOADING AND UNLOADING

When loading or unloading the machine, mistaken operation

may bring the hazard of the machine tipping over or falling, so
particular care is necessary. Always do as follows.

q Perform loading and unloading on firm, level ground only.

Maintain a safe distance from the edge of the road or cliff.

q 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.

q Be sure the ramp surface is clean and free of grease, oil, (1) Blocks
ice and loose materials. Remove dirt from machine-tracks. (2) Ramp
On a rainy day, in particular, be extremely careful since the (3) Width of ramps: Same width as track
ramp surface is slippery. (4) Angle of ramps: 15°
(5) Block
q Run the engine at low speed and travel slowly.

q When on the ramps, do not touch any other parts.

q Never correct your steering on the ramps. If necessary, drive off the ramps, correct the direction, then enter
the ramps again.

q The center of gravity of the machine will change suddenly at the joint between the ramps and the track or
trailer, and there is danger of the machine losing its balance. Travel slowly over this point.

q When loading or unloading to an embankment or platform, make sure that it has suitable width, strength, and
grade.

q For machines equipped with a cab, always lock the door after boarding the machine. If this is not done, the
door may suddenly open during transportation.
Refer to “TRANSPORTATION (3-118)“.

SHIPPING
When shipping the machine on a trailer, do as follows.

q The weight, transportation height, and overall length of the machine differ according to the work equipment, so
be sure to confirm the dimensions.

q When passing over bridges or structures on private land, check first that the structure is strong enough to sup-
port the weight of the machine. When traveling on public roads, check first with the relevant authorities and fol-
low their instructions.
q For details of the shipping procedure, see “TRANSPORTATION (3-118)“ in the OPERATION section.

2-23
PRECAUTIONS FOR OPERATION SAFETY

BATTERY 2
BATTERY HAZARD PREVENTION

Battery electrolyte contains sulphuric acid, and batteries generate flammable hydrogen gas, which may explode.
Mistaken handling can lead to serious injury or fire. For this reason, always observe the following precautions.

q Do not use or charge the battery if the battery electrolyte level is below the LOWER LEVEL line. This may
cause an explosion. Check the battery electrolyte level periodically and add distilled water to bring the electro-
lyte level to the UPPER LEVEL line.

q When working with batteries, always wear safety glasses and rubber gloves.

q Never smoke or use any flame near the battery.

q If you spill acid on your clothes or skin, immediately flush

the area with large amount of water.

q If acid gets into your eyes, flush them immediately with

large amount of water and seek medical attention.

q Before working with batteries, turn the starting switch to the OFF position.

As there is a hazard that sparks will be generated, always do as follows.

q Do not let tools or other metal objects make any contact between the battery terminals. Do not leave tools or
other metal objects lying around near the battery.

q Always disconnect the negative (-) terminal (ground side) first when removing the battery; when installing the
battery, connect the positive (+) terminal first, and connect the ground last. Tighten the battery terminals
securely.

q Flammable hydrogen gas is generated when the battery is charged, so remove the battery from the chassis,
take it to a well-ventilated place, and remove the battery caps before charging it.

q Tighten the battery caps securely.

q Install the battery securely to the determined place.

2-24
SAFETY PRECAUTIONS FOR OPERATION

STARTING WITH BOOSTER CABLE

If any mistake is made in the method of connecting the booster

cables, it may cause the battery to explode, so always do as
follows.

q When starting with a booster cable, carry out the starting

operation with two workers (one worker sitting in the opera-
tor's seat and the other working with the battery).

q When starting from another machine, do not allow the two

machines to touch.
q When connecting the booster cables, turn the starting
switch OFF for both the normal machine and problem
machine. There is a hazard that the machine will move
when the power is connected.

q Be sure to connect the positive (+) cable first when install-

ing the booster cables. Disconnect the negative (-) cable
(ground side) first when removing them.

q When removing the booster cables, be careful not to let the

booster cable clips touch each other or to let the clips touch
the machine.
q Always wear safety goggles and rubber gloves when start-
ing the engine with booster cables.

q When connecting a normal machine to a problem machine

with booster cables, always use a normal machine with the
same battery voltage as the problem machine.

q For details of the starting procedure when using booster

cables, see “STARTING ENGINE WITH BOOSTER
CABLE (3-139)“ in the OPERATION section.

2-25
PRECAUTIONS FOR OPERATION SAFETY

TOWING 2
WHEN TOWING

Serious injury or death could result if a disabled machine is towed incorrectly or if there is a mistake in the selec-
tion or inspection of the wire rope.

For towing method, see section “MACHINE TOWING METHOD (3-132)“.

q Always wear leather gloves when handling wire rope.

q Connect a wire rope to the part indicated with the arrow in

the diagram at right.

q During the towing operation, never stand between the tow-

ing machine and the machine being towed.

q Never tow a machine on a slope.

q Never use a wire rope which has cut strands (A), reduced
diameter (B), or kinks (C). There is danger that the rope
may break during the towing operation.

q If the engine stops or the oil pressure in the brake circuit drops because of trouble in the hydraulic system, the
brake is applied and the machine cannot move. To move the machine, it is necessary to use a special device
to raise the oil pressure in the brake circuit to the specified level and release the brake. For details of the
method of releasing the brake, see “MACHINE TOWING METHOD (3-132)“.

2-26
SAFETY PRECAUTIONS FOR MAINTENANCE

PRECAUTIONS FOR MAINTENANCE 2

WARNING TAG

q Always attach the “DO NOT OPERATE“ warning tag to the

work equipment control lever in the operator's cab to alert
others that you are performing service or maintenance on
the machine. Attach additional warning tags around the
machine if necessary.
Warning tag Part No. 09963-03001

Keep this warning tag in the tool box while it is not used. If
there is no toolbox, keep the tag in the operation manual
pocket.

q If others start the engine, or touch or operate the work

equipment control lever while you are performing service
or maintenance, you could suffer serious injury or property
damage.

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 substances
that will cause you to slip. Always keep the work place clean the tidy to enable you to carry out operations safely.
If the work place is not kept claen and tidy, there is the danger that you will trip, slip, or fall over and injure yourself.

APPOINT LEADER WHEN WORKING WITH OTHERS

When repairing the machine or when removing and installing the work equipment, appoint a leader and follow his
instructions during the operation.
When working with others, misunderstandings between workers can lead to serious accidents.

STOP ENGINE BEFORE CARRYING OUT INSPECTION AND MAINTENANCE

q Stop the machine on firm, level ground.

q Select a place where there is no hazard of falling rocks or

landslides, or of flooding if the land is low.
q Lower the work equipment completely to the ground and
stop the engine.

2-27
PRECAUTIONS FOR MAINTENANCE SAFETY

q Set work equipment lock lever (1) and parking barke lever
(2) to the LOCK position (L).

q Put blocks under the track to prevent the machine from

moving.

TWO WORKERS FOR MAINTENANCE WHEN ENGINE IS RUNNING

To prevent injury, do not carry out maintenance with the engine running. If maintenance must be carried out with
the engine running, carry out the operation with at least two workers and do as follows.

q 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.

q When carrying out operations near the fan, fan belt, or

other rotating parts, there is a hazard of being caught in the
parts, so be careful not to come close.

q Never drop or insert tools or other objects into the fan or

fan belt. Parts may break or be sent flying.

q Set work equipment lock lever (1) and parking barke lever
(2) to the LOCK position (L).
q Do not touch any control levers. If any control lever must
be operated, give a signal to the other workers to warn
them to move to a safe place.

2-28
SAFETY PRECAUTIONS FOR MAINTENANCE

PROPER TOOLS

Use only tools suited to the task and be sure to use the tools
correctly. Using damaged, low quality, faulty, makeshift tools or
improper use of the tools could cause serious personal injury.

ACCUMULATOR

The accumulator is charged with high-pressure nitrogen gas.

When handling the accumulator, careless procedure may
cause an explosion which could lead to serious injury or prop-
erty damage. For this reason, always observe the following
precautions.

q Do not disassemble the accumulator.

q Do not bring it near flame or dispose of it in fire.

q Do not make holes in it, weld it, or use a cutting torch.

q Do not hit or roll the accumulator, or subject it to any

impact.

q When disposing of the accumulator, the gas must be

released. Please contact your Komatsu distributor to have
this work performed.

NO UNAUTHORIZED PERSONNEL INTO AREA

Only authorized personnel can service and repair the machine. Do not allow unauthorized personnel into the
area. If necessary, employ an observer.

ATTACHMENTS

q Appoint a leader before starting removal or installation

operations for attachments.

q Place attachments that have been removed from the

machine in a stable condition so that they do not fall. And
take steps to prevent unauthorized persons from entering
the storage area.

2-29
PRECAUTIONS FOR MAINTENANCE SAFETY

WORK UNDER THE MACHINE

q If it is necessary to go under the work equipment or the

machine to carry out service and maintenance, support the
work equipment and machine securely with blocks and
stands strong enough to support the weight of the work
equipment and machine.

q 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
occurring to the hydraulic piping, the work equipment or the
machine will suddenly drop. This is extremely dangerous.
Never work under the work equipment or the machine.

NOISE

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

PRECAUTIONS WHEN USING HAMMER

When using a hammer, pins may fly out or metal particles may
be scattered. This may lead to serious injury. Always do as
follows.

q If hard metal parts such as pins, bucket teeth, cutting

edges, or bearings are hit with a hammer, there is a hazard
that pieces might be scattered and cause injury. Always
wear safety goggles and gloves.

q When hitting pins or bucket teeth, there is a hazard that

broken pieces might be sent flying and injure people in the
surrounding area. Always check that there is no one in the
surrounding area.

q There is a hazard that the pin hit with strong force may fly out and injure people in the surrounding area.

REPAIR WELDING

Welding operations must always be carried out by a qualified welder and in a place equipped with proper equip-
ment. There is a hazard of gas, fire, or electrocution when carrying out welding, so never allow any unqualified
personnel to carry out welding.

REMOVING BATTERY TERMINAL

When repairing the electrical system or when carrying out electrical welding, remove the negative (-) terminal of
the battery to prevent the flow of current.

2-30
SAFETY PRECAUTIONS FOR MAINTENANCE

PRECAUTIONS WHEN USING HIGH-PRESSURE GREASE TO ADJUST TRACK TENSION

q 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 property damage.

q When loosening grease drain plug (1) to loosen the track

tension, never loosen it more than one turn. Loosen the
grease drain plug slowly.

q 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 attempt to disassemble the recoils spring assembly. It contains a spring under high pressure which serves
as a shock absorber for the idler. If it is disassembled by mistake, the spring will fly out and cause serious injury.
When it becomes necessary to disassemble it, ask your Komatsu distributor to do the work.

PRECAUTION WITH HIGH-PRESSURE OIL

The hydraulic system is always under internal pressure. When inspecting or replacing piping or hoses, always
check that the pressure in the hydraulic circuit has been released. If the circuit is still under pressure, it will lead to
serious injury, so always do as follows.

q Always release the pressure before starting any inspection or replacement operation.

q If there is any leakage from the piping or hoses, the surrounding area will be wet, so check for cracks in the
piping and hoses and for swelling in the hoses.
When carry out inspection, wear safety glasses and leather gloves.

q There is a hazard that high-pressure oil leaking from small

holes may penetrate your skin or cause blindness if it con-
tacts your eyes directly. If you are hit by a jet of high-pres-
sure oil and suffer injury to your skin or eyes, wash the
place with clean water, and consult a doctor immediately
for medical attention.

2-31
PRECAUTIONS FOR MAINTENANCE SAFETY

HANDLING HIGH-PRESSURE HOSES

q If oil or fuel leaks from high-pressure hoses, it may cause fire or defective operation, which may lead to serious
injury. If any loose bolts are found, stop work and tighten to the specified torque. If any damaged hoses are
found, stop operations immediately and contact your Komatsu distributor.

Replace the hose if any of the following problems are found.

q Damaged or leaking hydraulic fitting.

q Frayed or cut covering or exposed reinforcement wire layer.

q Covering swollen in places.

q Twisted or crushed movable portion.

q Foreign material embedded in covering.

WASTE MATERIAL

To prevent pollution, pay careful attention to the method of disposing of waste materials.

q Always put oil drained from your machine in containers.

Never drain oil directly onto the ground or dump into the
sewage system, rivers, the sea, or lakes.

q Obey appropriate laws and regulations when disposing of

harmful objects such as oil, fuel, coolant, solvent, filters,
and batteries.

MAINTENANCE FOR AIR CONDITIONER

If air conditioner refrigerant gets into your eyes, it may cause blindness; if it touches your skin, it may cause frost-
bite.

Never touch refrigerant.

COMPRESSED AIR

q When carrying out cleaning with compressed air, there is a hazard of serious injury caused by flying particles.
q When using compressed air to clean elements or the radiator, always wear safety goggles, dust mask, gloves,
and other protective equipment.

PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS

q In order for the machine to be operated safety for a long time, it is necessary to add oil and to carry out service
and maintenance at periodic intervals. In order to further increase safety, components with a strong relation-
ship to safety, such as hoses and seat belts, must be replaced at periodic intervals.

Replacement of safety critical parts: See “PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS (4-
15)“.

q 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 injury or death.
It is difficult to judge the remaining life of these components from external inspection or the feeling when oper-
ating, so always replace them at the specified interval.
q Replace or repair safety-critical parts if any defect is found, even when they have not reached the time speci-
fied interval.

2-32
OPERATION

13
GENERAL VIEW OPERATION

GENERAL VIEW 3

GENERAL VIEW OF MACHINE 3

Machine equipped with cab

Machine equipped with canopy

(1) Blade
(7) Pivot shaft
(2) Angle cylinder
(8) Track frame
(3) Cab
(9) Lift cylinder
(4) ROPS canopy
(10) Idler
(5) Track shoe
(11) Canopy
(6) Sprocket

3-2
OPERATION GENERAL VIEW

GENERAL VIEW OF CONTROLS AND GAUGES 3

Machine equipped with cab

(1) Parking brake lever (13) Starting switch

(2) Work equipment lock lever (14) Information switch
(3) Cigarette lighter (15) Buzzer cancel switch
(4) Fuel control dial (16) Brake pedal
(5) Steering, forward-reverse, gear shift lever (17) Decelerator pedal
(6) Auto shift down switch (18) Blade control lever
(7) Preset mode switch (19) Horn switch
(8) Head lamp switch (20) Ripper control lever (if equipped)
(9) Air conditioner panel or heater panel (21) Rear glass heating switch (if equipped)
(10) Monitor panel (22) Additional working lamp switch (if equipped)
(11) Rear lamp switch (23) Wiper switch
(12) Fan rotation selector switch (24) Room lamp switch

3-3
GENERAL VIEW OPERATION

Machine equipped with canopy

(1) Parking brake lever (10) Fan rotation selector switch

(2) Work equipment lock lever (11) Information switch
(3) Fuel control dial (12) Buzzer cancel switch
(4) Steering, forward-reverse, gear shift lever (13) Starting switch
(5) Auto shift down switch (14) Brake pedal
(6) Preset mode switch (15) Decelerator pedal
(7) Head lamp switch (16) Blade control lever
(8) Monitor panel (17) Horn switch
(9) Rear lamp switch (18) Ripper control lever (if equipped)

3-4
OPERATION GENERAL VIEW

MONITOR PANEL

(1) Display panel A

(9) Filter/oil replacment interval lamp
(Speed range display, Engine speed)
(10) Warning lamp
(2) Power train oil temperature gauge
(11) Engine coolant temperature caution lamp
(3) Engine coolant temperature gauge
(12) Maintenance caution lamp
(4) Hydraulic oil temperature gauge
(13) Engine preheating pilot lamp
(5) Fuel level gauge
(14) Engine oil pressure caution lamp
(6) Hydraulic oil temperature caution lamp
(15) Charge caution lamp
(7) Power train oil temperature caution lamp
(16) Display panel B (multi-information)
(8) Fan operation confirmation lamp

3-5
EXPLANATION OF COMPONENTS OPERATION

EXPLANATION OF COMPONENTS 3
The following is an explanation of devices needed for operating the machine.

To perform suitable operations correctly and safely, it is important to completely understand methods of operating
the equipment, and the meanings of the displays.

FRONT PANEL 3

(A) Emergency caution group (D) Lamp

(B) Caution group (E) Switch
(C) Meter group

3-6
OPERATION EXPLANATION OF COMPONENTS

CHECK MONITOR SYSTEM 3

MONITOR SYSTEM

NOTICE
q Stop the machine on level ground and carry out the monitor check.

q Stop the engine, then turn the starting switch to the ON position and check that the lamps light up for
approx. 2 seconds. If they do not light up, please ask your Komatsu distributor to carry out inspec-
tion.

q The monitor check cannot be carried out until at least 5 seconds has passed after the engine was
stopped.

When carrying out the checks before starting, use the monitor system check.

1. Turn the starting switch to the ON position.

2. Check that the monitor liquid-crystal display and the lamps

all light up for 2 seconds, that the alarm buzzer sounds for
2 seconds, and that “KOMATSU SYSTEM CHECK“ is dis-
played for 3 seconds on display panel B (multi-information)
(1).
q After 2 seconds, the current status of the machine is
displayed on liquid-crystal display (2).

q After 2 seconds, the lamp portion (3) goes out.

q After 3 seconds, the operating mode is displayed on

display panel B (multi-information) (1).

REMARK
The following cases do not indicate any problem.
If the preheating heater is actuated in cold weather, HEAT lamp
(4) does not go out until the preheating is completed.
If the oil or filter replacement interval has been reached, main-
tenance caution lamp (5) or filter oil replacement interval lamp
(6) light up or flash for 30 seconds, and the action code is dis-
played on display panel B (multi-information) (1).

3-7
EXPLANATION OF COMPONENTS OPERATION

EMERGENCY CAUTION ITEMS 3

CAUTION
If any of the caution lamps begins to flash, stop the engine or reduce the engine speed to low idling imme-
diately and check the trouble spot for necessary actions.

These items must be monitored when the engine is running. If there is any problem, the caution lamp for the loca-
tion of the problem and warning lamp (A) flash, and the alarm buzzer sounds intermittently. Take the necessary
action immediately.

(1) Engine oil pressure caution lamp (3) Power train oil temperature caution lamp
(2) Engine coolant temperature caution lamp (4) Hydraulic oil temperature caution lamp

ENGINE OIL PRESSURE CAUTION LAMP

This lamp (1) indicates a low engine oil pressure.

If the monitor lamp flashes, stop the engine and check it imme-
diately.

REMARK
The alarm buzzer sounds, when the starting switch is turned to
ON immediately after the engine oil has been changed. It does
not indicate an problem.

3-8
OPERATION EXPLANATION OF COMPONENTS

ENGINE COOLANT TEMPERATURE CAUTION LAMP

This lamp (2) indicates a raise in the coolant temperature.

When the monitor lamp flashes, run the engine at low idling
speed until green range of the engine coolant temperature
gauge lights.

POWER TRAIN OIL TEMPERATURE CAUTION LAMP

This lamp (3) indicates a rise in the oil temperature of the

torque converter outlet.

When the monitor lamp flashes, run the engine at the low idling
speed until the green range of the power train oil temperature
gauge lights.

HYDRAULIC OIL TEMPERATURE CAUTION LAMP

Lamp (4) indicates a rise in the hydraulic oil temperature.

When the monitor lamp flashes, stop the machine and run the
engine at the low idling speed until oil temperature falls.

3-9
EXPLANATION OF COMPONENTS OPERATION

CAUTION ITEMS 3

CAUTION
If these caution lamps item flash, check and repair the appropriate location as soon as possible.

These are items which need to be observed when the engine is running. If any problem occurs, the item needing
immediate repair is displayed. If there is any problem, the problem location on the caution lamp will flash.

(1) Battery charge circut caution lamp (2) Maintenance caution lamp

BATTERY CHARGE CIRCUIT CAUTION LAMP

This lamp (1) indicates an problem in the charging system

while the engine is running.

If the monitor lamp flashes, check the V-belt tension. If any

problem is found, see “OTHER TROUBLE (3-142)“.

REMARK
This monitor lamp lights when the starting switch is turned to
ON immediately after the engine is started or immediately
before the engine is stopped. It does not indicate an problem.

3-10
OPERATION EXPLANATION OF COMPONENTS

MAINTENANCE CAUTION LAMP

This lamp (2) lights up for approx. 30 seconds after the starting
switch is turned to the ON position if the filter or oil replacement
interval has been reached.

After replacing the indicated filter or oil displayed on display

panel B (multi-information), reset the interval. For details, see
“METHOD OF USING OIL AND FILTER MAINTENANCE
MODE (3-26)“.
The lamp goes out.

REMARK
At the same time, the filter or oil replacement interval lamp also
lights up or flashes.

3-11
EXPLANATION OF COMPONENTS OPERATION

METER GROUP 3

(1) Engine coolant temperature gauge (5) Engine preheating pilot lamp
(2) Power train oil temperature gauge (6) Display panel A
(3) Hydraulic oil temperature gauge (Speed range display, Engine speed)
(4) Fuel level gauge (7) Display panel B (multi-information)

ENGINE COOLANT TEMPERATURE GAUGE

NOTICE
If the coolant temperature gauge often enters red range (C), check the radiator for clogging.

Gauge (1) indicates temperature of the engine coolant.

If the temperature is normal during operation, green range (B)

will light.

If red range (C) lights during operation, move the fuel control
dial to lower engine speed tp approx. 3/4 of the full speed, and
run until the coolant temperature enters green range (B).
If red range (C) lights up during operation, and the engine cool-
ant temperature caution lamp flashes and the alarm buzzer
sounds, stop the machine, run the engine at low idle, and wait
for the coolant temperature to return to green range (B).

(A): White range

(B): Green range

(C): Red range

3-12
OPERATION EXPLANATION OF COMPONENTS

POWER TRAIN OIL TEMPERATURE GAUGE

NOTICE
If the power train oil temperature gauge often enters the red range (C), we recommend you to lower the
travel speed one range (for example, F2 → F1) to reduce the load on the power train when operating.

Gauge (2) indicates the torque converter outlet oil temperature.

If the temperature is normal during operation, green range (B)
will light.

If red range (C) lights up during operation, move the fuel con-
trol dial to lower engine speed to approx. 3/4 of the full speed,
reduce the load and run until the oil temperature enters green
range (B).

If red range (C) lights up during operation, and the power train
oil temperature caution lamp flashes and the alarm buzzer
sounds, stop the machine, run the engine at low idle, and wait
for the oil temperature to go down to green range (B).

(A): White range

(B): Green range

(C): Red range

HYDRAULIC OIL TEMPERATURE GAUGE

Gauge (3) indicates the hydraulic oil temperature.

If the temperature is normal during operation, green range (B)

will light.

If the red range (C) lights up during operation, move the fuel
control lever to lower the engine speed to approx. 3/4 of the full
speed, reduce the load and run until the oil temperature enters
the green range (B).

(A): White range

(B): Green range

(C): Red range

3-13
EXPLANATION OF COMPONENTS OPERATION

FUEL LEVEL GAUGE

Gauge (4) fuel level in the fuel tank.

During normal operation, the green range (B) should be lighted

up.

If red range (A) lights up during operation, add fuel immedi-

ately.
(A): Red range

(B): Green range

REMARK
The display is not proportional to the amount of fuel remaining.
If only the red range (A) lights up, there is less than 56 liters
(14.80 US gal) of fuel remaining.

ENGINE PRE-HEATING PILOT LAMP

This lamp (5) indicates that the engine is being preheated with
an electric heater in cold weather.

When the engine starting switch is turned to the ON position,

the controller detects the engine coolant temperature and auto-
matically starts to preheat the engine at low temperature.

DISPLAY PANEL A (speed range display, engine speed)

Meter (6) displays the transmission speed range being used on

the machine and engine speed.

q The travel direction (A) and speed range (B) are displayed
in the center of the speed range display.

(A) F: FORWARD
R: REVERSE

N: Neutral

P: Parking brake lever at LOCK position

(B) 1: 1st

2: 2nd

3: 3rd
Example: F1 is displayed for FORWARD 1st

q Bar graph (C) around the outside of the display shows the engine speed.
If the bar graph reaches red range (D) during operation, take action to reduce the engine speed. Always keep
the bar graph in the green range.

3-14
OPERATION EXPLANATION OF COMPONENTS

DISPLAY PANEL B (multi-information)

The top and bottom lines in display panel B (multi-information) display information related to the condition of the
machine.

The content of the display is divided into “OPERATING MODE“ and “MAINTENANCE MODE“. Use the buzzer
cancel switch to switch between the operating mode and maintenance mode.

For details of switching the mode, see “BUZZER CANCEL SWITCH (3-23)“.

OPERATING MODE (default screen)

Use this mode when operating the machine.

REMARK
When the starting switch is turned from the OFF position to the ON position, display panel B (multi-information)
always displays the operating mode.

The following information is displayed by the operating mode.

Top line (A): Action code

If any problem occurs on the machine, an action code is dis-
played. If an action code appears, take the applicable action.
For details, see “OTHER TROUBLE (3-142).

This displays various types of filter or oil replacement intervals

have been reached.

Bottom line, left (B): Preset mode

When the preset mode switch is ON, the selected preset mode
is displayed.

For details of selecting the preset mode, see “GEARSHIFTING

OPERATION USING PRESET MODE FUNCTION (3-102)“.

Bottom line, right (C): Service meter or engine speed

Use the information switch to switch the display between the service meter and engine speed. For details of
switching the display, see “INFORMATION SWITCH (3-23)“.

Service meter

This displays the total number of hours that the machine has been operated. Use the display to determine the
intervals for periodic maintenance.
While the engine is running, the service meter advances, even if the machine is not being operated.

While the engine is running, the hourglass mark at the side of the meter flashes to show that the meter is advanc-
ing.

The meter advances 0.1h for every 6 minutes that the engine is running, regardless of the engine speed.

3-15
EXPLANATION OF COMPONENTS OPERATION

Maintenance mode
This displays various types of information related to mainte-
nance of the machine.

For details, see “METHOD OF USING MAINTENANCE MODE

(3-24)“.

3-16
OPERATION EXPLANATION OF COMPONENTS

LAMPS 3

(1) Warning lamp (3) Fan operation confirmation lamp

(2) Filter/oil replacement interval lamp

WARNING LAMP

(Red)

NOTICE
If alarm buzzer sounds, stop work immediately and perform inspection and maintenance of the appropri-
ate point.

This lamp (1) flashes when the caution lamp flashes and when
an action code is displayed on display panel B (multi-informa-
tion).

When the caution lamp (A) of an emergency warning item

flashes, or when the part of an action code is displayed, the
alarm buzzer sounds continuously at the same time.

3-17
EXPLANATION OF COMPONENTS OPERATION

FILTER/OIL REPLACEMENT INTERVAL LAMP

(Yellow)

If it is time to replace a filter or change the oil, this lamp (2)

lights up or flashes for approx. 30 seconds after the starting
switch is turned ON.

REMARK
This lamp (2) lights up if there is less than 30 hours remaining
until replacement, and flashes when the replacement interval
has passed.
At the same time, maintenance caution lamp (A) also lights up.

After replacing the indicated filter or oil displayed on display

panel B (multi-information), reset the time. For details, see
“METHOD OF USING OIL AND FILTER MAINTENANCE
MODE (3-26)“.

The lamp goes out or stops flashing.

FAN OPERATION CONFIRMATION LAMP

(Orange)

This lamp (3) flashes in the following situations.

q When the direction of cooling fan rotation does not switch

even when the fan is operated to rotate in the reverse
direction.

q During the time from the point where the starting switch is
turned ON to the point where the engine starts when the
engine is started with the fan set to reverse rotation or cool-
ing.

q When the hydraulic circuit is in protected status.

For details, see “FAN ROTATION SELECTOR SWITCH (3-

22)“.

3-18
OPERATION EXPLANATION OF COMPONENTS

SWITCHES 3
Machine equipped with cab

Machine equipped with canopy

(1) Starting switch (5) Rear lamp switch

(2) Auto shift down switch (6) Fan rotation selector switch
(3) Preset mode switch (7) Information switch
(4) Head lamp switch (8) Buzzer cancel switch

3-19
EXPLANATION OF COMPONENTS OPERATION

STARTING SWITCH

This switch (1) is used to start or stop the engine.

(A): OFF position

At this position, the starting switch key can be inserted and
removed. When the switch is turned to this position, all the
electric circuits are turned off and the engine stops.

(B): ON position

In this position, electric current flows in the charging and lamp

circuits.

Keep the starting switch key at the ON position while the

engine is running.

(C): START position

This is the position to start the engine. Hold the key at this position while cranking the engine. Release the key
immediately after the engine has been started. The key will return to ON position (B) when released

AUTO SHIFT DOWN SWITCH

This switch (2) is used to actuate the auto shift down function
and shift the transmission automatically to a low speed range.

○ (OFF) position: Stopped

l (ON) position: Actuated

For details, see “AUTO DOWN SHIFT OPERATION (3-103)“.

PRESET MODE SWITCH

This switch (3) is used to actuate the preset mode function.

○ (OFF) position: Stopped

l (ON) position: Actuated

For details, see “GEARSHIFTING OPERATION USING PRE-

SET MODE FUNCTION (3-102)“.

3-20
OPERATION EXPLANATION OF COMPONENTS

HEAD LAMP SWITCH

This switch (4) lights up when the front lamp, and panel lamp
light up.

○ (OFF) position: Lights out

l (ON) position: Lights on

REAR LAMP SWITCH

This switch (5) lights up the rear lamps.

○ (OFF) position: Lights out

l (ON) position: Lights on

3-21
EXPLANATION OF COMPONENTS OPERATION

FAN ROTATION SELECTOR SWITCH

This switch (6) is used to switch the direction of rotation of the

cooling fan.

○ position : Normal rotation

Normally use this position.

The air is pushed out to the front through the radiator mask.

The speed of the fan changes to match the temperature of the

coolant in order to improve the cooling efficiency.

REV position: Reverse rotation

The fan rotates in the reverse direction.

The air is sucked into the engine room through the radiator
mask. This makes it possible to use the heat from the radiator
to warm the operator's cab.

Operating with the fan rotating in reverse may cause overheat-

ing, so use this function only during cold weather (ambient tem-
perature below 15°C).

CLN position: Cleaning

The fan rotates in the reverse direction at high speed, regard-

less of the coolant temperature.

Use this function to clean the radiator fins.

Stop the engine and turn the starting switch to the ON position before operating this switch.

REMARK
If the engine is running, the direction of rotation of the fan will
not change even when the fan rotation selector switch is oper-
ated.
The fan operation confirmation lamp will flash to inform the
operator that the direction of rotation of the fan has not
changed.
Stop the engine, then start it again. The direction of rotation of
the fan will be switched.
When the cooling fan is being operated in reverse or in the
cleaning mode, even if the starting switch is turned to the OFF
position, the hydraulic circuit protection function will be actu-
ated and the power supply will not be cut immediately.
During this time, the fan operation confirmation lamp will flash
to inform the operator that the power supply is being main-
tained.

3-22
OPERATION EXPLANATION OF COMPONENTS

INFORMATION SWITCH

This switch (7) is used to operate display panel B (multi-infor-

mation).

When the switch is released, it returns automatically to the cen-

ter position.

q When display panel B (multi-information) is in the

operation mode
turn the switch to < or > to switch the display to service
meter or engine speed.

q When display panel B (multi-information) is in the

maintenance mode
It is used to move between sub modes, between items, to
move the cursor, or to change values.

For details, see “METHOD OF USING MAINTENANCE

MODE (3-24)“.

BUZZER CANCEL SWITCH

This switch (8) is used to operate control panel B (multi-infor-

mation) or to stop the alarm buzzer.
When the switch is released, it returns automatically to the cen-
ter position.

q When display panel B (multi-information) is in operation

mode

q When the alarm buzzer is sounding, turn this switch to

the left or right to stop the buzzer.

q If the switch is held at the (a) position for at least 2.5

seconds, the display switches to the maintenance
mode.

q When display panel B (multi-information) is in the maintenance mode

„ position: Cancel or reset to operation mode

position: Confirms selection or selected item

For details, see “METHOD OF USING MAINTENANCE MODE (3-24)“.

3-23
EXPLANATION OF COMPONENTS OPERATION

METHOD OF USING MAINTENANCE MODE 3

To switch from the operation mode to the maintenance mode,

turn the buzzer switch to the „ position and hold it there for at
least 2.5 seconds. The screen will switch to the maintenance
mode.

On the first screen, the oil and filter maintenance mode is dis-
played.

EXPLANATION OF MODES AND OPERATION

The maintenance mode has the following 4 sub modes.

Sub mode Function Reference items

Oil or filter replacement time is dis- METHOD OF USING OIL AND FILTER
Oil/filter maintenance mode
played MAINTENANCE MODE (3-26)
Engine speed or hydraulic circuit METHOD OF USING PM CLINIC AUXIL-
PM clinic auxiliary mode
pressure is displayed IARY MODE (3-28)
Fault codes for electronic control METHOD OF USING FAULT CODE DIS-
Fault code display mode
related parts are displayed PLAY MODE (3-29)
METHOD OF USING USER ADJUST
Adjustment mode Adjusts monitor brightness, etc.
MODE (3-30)

Use information switch (1) and buzzer cancel switch (2) to

operate each mode.

3-24
OPERATION EXPLANATION OF COMPONENTS

METHOD OF SELECTING EACH MODE

3-25
EXPLANATION OF COMPONENTS OPERATION

METHOD OF USING OIL AND FILTER MAINTENANCE MODE

NOTICE
This function is only a guideline. If dirty oil or filters are found during daily maintenance, replace them
immediately.
If the controllers or monitor panel are replaced, the timer for this function will not work properly. Contact
your Komatsu distributor for replacement.

In the oil and filter maintenance mode, the replacement inter-

vals for oil and filters are displayed on display panel B (multi-
information).

(1) The item is displayed.

(2) The time remaining until replacement is displayed.

(3) The quantity of replacements until now is displayed.

The display items can be displayed in order by operating the

information switch to the left or right (<, >).

Replacement interval
Code Display Item 1st time 2nd and following times
(cannot be changed) (can be changed)
01 ENG OIL Engine oil 500h 500h
02 ENG FILT Engine oil filter 500h 500h
03 FUEL FILT Fuel filter 500h 500h
04 HYD FILT Hydraulic oil filter 500h 2000h
05 CORR RES Corrosion resistor 500h 500h
06 BYPS FILT Bypass filter (*) - -
07 DAMP OIL Damper oil 500h 2000h
08 FNL OIL Final drive oil 500h 1000h
09 HYD OIL Hydraulic oil 500h 2000h
10 POWL OIL Power train oil 500h 1000h
11 POWL FILT Power train oil filter 500h 500h
12 HSS FILT HSS charge filter (*) - -

q The timing of the 1st interval cannot be changed. If some special condition makes it desirable to change the
1st interval, use the maintenance mode in the operator mode to change the replacement interval as follows.
First, set so that the system thinks that the 1st maintenance has been completed, then set the 2nd and follow-
ing times.

q (*) Although the marked item is displayed, it is not used with this machine.

3-26
OPERATION EXPLANATION OF COMPONENTS

When the oil or filter has been replaced, select the applicable
item, then operate the buzzer cancel switch to .
The screen will ask if you want to display the replacement his-
tory.

Operate the information switch to select YES, then operate the

buzzer cancel switch to . The replacement quantity will
increase by 1, the replacement interval will be reset, and the
oil, filter change interval lamp will go out.

When this is done, if the maintenance caution lamp does not

go out, there is another item close to the replacement time, so
check that item.

REMARK
To return to the maintenance mode, operate the buzzer cancel
switch to „.

3-27
EXPLANATION OF COMPONENTS OPERATION

METHOD OF USING PM CLINIC AUXILIARY MODE

CAUTION
When moving the work equipment or setting the transmission to the travel position for carrying out mea-
surements, check carefully that the situation is safe.

The PM clinic auxiliary mode displays the engine speed on display panel B (multi-information).

Display panel B (Malti-information) displays the item on the top

line (1) and the measured value on the bottom line (2).

REMARK
Items such as the engine speed fluctuate and are difficult to see during the measurement. In such cases, operate
the buzzer cancel switch to . This makes it possible to hold the display of the value.
To cancel this mode, operate the buzzer cancel switch again to .
To return to the maintenance mode, operate the buzzer cancel switch to „.

3-28
OPERATION EXPLANATION OF COMPONENTS

METHOD OF USING FAULT CODE DISPLAY MODE

NOTICE
The fault items observed by this function are connected with the electronic control, so even if a fault code
is not displayed, there is probably some problem with the machine. If the operator feels any problem with
the machine, the machine should be stopped immediately and checked.

When any disconnection or short circuit in any sensor is detected, the location and fault code are displayed by a 6-
digit code on display panel B (multi-information). When contacting your Komatsu distributor, inform your distributor
of the code at the same time.

If the failure observation function has not determined the condi-

tion of the machine, the display is as shown in the diagram on
the right.

With this function, existing failures can be displayed up to a

maximum of 20 items.

If multiple failures are occurring, the display automatically

changes every 2 seconds, so check the code (1).

The display is shown repeatedly.

REMARK
To return to the maintenance mode, operate the buzzer cancel switch to „.

3-29
EXPLANATION OF COMPONENTS OPERATION

METHOD OF USING USER ADJUST MODE

With the user adjust mode, the brightness of the panel screen backlighting and the contrast of the liquid crystal
panel can be changed.

1. Adjusting backlighting of liquid crystal display

2. The diagram on the right is the mode for adjusting the

brightness of the backlighting of the liquid crystal panel.

This display will be switched to the screen brightness

adjustment display, if the alarm buzzer cancellation switch
is turned to the position.

3. The brightness can be adjusted by operating the informa-

tion switch.
The higher the number, the brighter the screen becomes;
the lower the number, the darker the screen becomes.

> position: Number increases

< position: Number decreases

4. The brightness of the backlight for the LCD gauges may be

held constant by turning the alarm buzzer cancellation
switch to the position.

REMARK
To return to the maintenance mode, operate the buzzer cancel switch to „.
The brightness of the backlighting of the monitor panel differs according to whether the front lamp is lit or not.
Entering this mode when the front lamps are lit makes it possible to adjust the brightness when the front lamps are
lit. In the same way, entering this mode when the front lamps are not lit makes it possible to adjust the brightness
when the front lamps are not lit.

3-30
OPERATION EXPLANATION OF COMPONENTS

5. Adjusting backlighting of display panel B (multi-information)

6. The diagram on the right is the mode for adjusting the

brightness of the backlighting of the display panel B (multi-
information).

On the screen, operate the buzzer cancel switch to to

switch to the screen for adjusting the brightness.

7. The brightness can be adjusted by operating the informa-

tion switch.
The higher the number, the brighter the screen becomes;
the lower the number, the darker the screen becomes.

> position: Number increases

< position: Number decreases

8. When the buzzer cancel switch is operated to , the

brightness of the display panel B (multi-information) back-
lighting is set.

REMARK
To return to the maintenance mode, operate the buzzer cancel switch to „.
The brightness of the backlighting of the monitor panel differs according to whether the front lamp is lit or not.
Entering this mode when the front lamps are lit makes it possible to adjust the brightness when the front lamps are
lit. In the same way, entering this mode when the front lamps are not lit makes it possible to adjust the brightness
when the front lamps are not lit.

3-31
EXPLANATION OF COMPONENTS OPERATION

9. Adjusting contrast of liquid crystal display panel B (multi-information)

10. The diagram on the right is the mode for adjusting the con-
trast of the liquid crystal display panel B (multi-information).

On this screen, operate the buzzer cancel switch to to

switch to the screen to adjust the contrast.

11. The contrast can be adjusted by operating the information

switch.
The higher the number, the deeper the screen becomes;
the lower the number, the lighter the screen becomes.

> position: Number increases

< position: Number decreases

12. When the buzzer cancel switch is operated to , the con-

trast of the liquid crystal display panel B (multi-information)
is set.

REMARK
To return to the maintenance mode, operate the buzzer cancel switch to „.

3-32
OPERATION EXPLANATION OF COMPONENTS

SWITCHES 3
Machine equipped with cab

Machine equipped with canopy

(1) Fuel control dial (5) Wiper switch

(2) Horn switch (6) Cigarette lighter
(3) Room lamp switch (7) Accessory socket
(4) Additional working lamp switch (if equipped) (8) Rear glass heating switch (if equipped)

3-33
EXPLANATION OF COMPONENTS OPERATION

FUEL CONTROL DIAL

Dial (1) is used to control the engine speed and output.

(a) Low idling position: Turn fully to the left

(b) High idling position: Turn fully to the right

HORN SWITCH

The horn sounds when the button (2) at the rear of the blade
control lever at the right side of the operator's seat is pressed.

ROOM LAMP SWITCH

This (3) illuminates the room lamp.

(A) ON position: Lamps light up

(B) OFF position: Lamps are out

ADDITIONAL WORKING LAMP SWITCH

(Machine equipped with cab) (If equipped)

This switch (4) lights up the additional working lamps.

(A) ON position: Lamps light up

(B) OFF position: Lamps are out

3-34
OPERATION EXPLANATION OF COMPONENTS

WIPER SWITCH

This switch (5) activates the wipers.

The wiper switches are as follows.

(A): Left door (LH)

(B): Front window (FF)

(C): Right door (RH)

(D): Rear window (RR)

(E): Wiper intermittent operation switch (INT)

This is also used as the window washer switch.

The switch is operated as follows.

q Wiper only

(J) ON position: Wiper is operated

(K) OFF position: Wiper stops

q Wiper and window washer

If this is kept pressed to the ON position (J) while the wiper

is working, water will be sprayed out.

REMARK
When the wiper intermittent operation switch is ON position (J),
if the wiper switch for each window is turned ON position (J),
the wiper will move intermittently.

3-35
EXPLANATION OF COMPONENTS OPERATION

CIGARETTE LIGHTER

This lighter (6) 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 take it out to light your cig-
arette.

If the cigarette lighter is removed, the socket can be used as a

power source.

NOTICE
This cigarette lighter is 24V. Do not use it as the power
source for 12V equipment. If it is used so, the equipment
may fail.
The capacity of the cigarette lighter is 120W (24V x 5A).

ACCESSORY SOCKET

This (7) is used as the power source for a wireless or other 12V
equipment.

Accessory socket capacity: 60W (12V x 5A)

REAR GLASS HEATING SWITCH

(If equipped)

This switch (8) is used to actuate the rear glass heater wire
defroster in order to remove the mist from the glass.
ON position (A): Actuated

At the same time, indicator (C) lights up.

OFF position (B): Stopped

3-36
OPERATION EXPLANATION OF COMPONENTS

CONTROL LEVERS AND PEDALS 3

(1) Work equipment lock lever (4) Brake pedal

(2) Parking brake lever (5) Decelerator pedal
(3) Steering, forward-reverse, gear shift lever (6) Blade control lever

WORK EQUIPMENT LOCK LEVER

WARNING
q When leaving the operator's compartment, set the work equipment lock lever securely to the LOCK
position. If the work equipment lock lever is not at the LOCK position and the control levers are
touched by mistake, it may lead to serious personal injury.

q If the work equipment lock lever is not set securely to the LOCK position, the work equipment may
move and cause serious injury. Check that it is in the position shown in the diagram.
q When parking the machine or when carrying out maintenance, always lower the work equipment to the
ground, then set the work equipment lock lever to the LOCK position.

This lever (1) is a lock device for the work equipment control
lever.

(L) LOCK position: Work equipment does not move even when
work equipment control lever is operated

(F) FREE position: Work equipment moves according to opera-

tion of work equipment control lever

REMARK
When starting the engine, to ensure safety, always set the work
equipment lock lever to the LOCK position.

3-37
EXPLANATION OF COMPONENTS OPERATION

PARKING BRAKE LEVER

WARNING
q When parking the machine, always set the parking brake lever in the LOCK position.

q If the parking brake lever is operated, the brake is applied, even when the machine is traveling.
The machine will suddenly stop, so this is dangerous. For this reason, do not operate the parking
brake lever when the machine is moving, except in emergencies.

This lever (2) is the control lever for the parking brake.

(L) LOCK position: Parking brake is applied

(F) FREE position: Parking brake is released

REMARK
Before moving the parking brake lever to the LOCK position,
return the steering, forward-reverse, gear shift lever to the
NEUTRAL position.
When starting the engine, if the parking brake lever is not in the
LOCK position, the limit switch is actuated and it is impossible
to start the engine.

STEERING, FORWARD-REVERSE, GEAR SHIFT LEVER

This control lever (3) serves to change forward or reverse direction of machine travel, steer the machine to the
right or left, change the traveling speed and make a counter-rotation.

q Forward-reverse shifting

Position (A): FORWARD

Position (B): REVERSE

Position (N): NEUTRAL

Operate the lever to the front to travel FORWARD.

Operate the lever to the rear to travel in REVERSE.

q Steering

Position (L): Left turn

Position (R): Right turn

If the lever is set in the forward or reverse travel position and moved to the left or right, the machine will turn in the
direction that the lever is moved. The turning radius changes according to the amount that the lever is moved. If
the lever is moved fully to the left or right, the turning radius will become smaller.

REMARK
When moving the joystick lever, and the lever is released, it will return to (A) or (B) and the machine will travel in a
straight line.

3-38
OPERATION EXPLANATION OF COMPONENTS

q Gear shifting

When UP switch (U) or DOWN switch (D) is pushed, the trans-

mission speed will change.
UP switch (U): Each time the switch is pressed, the transmis-
sion will up shift one speed.

DOWN switch (D): Each time the switch is pressed, the trans-
mission will down shift one speed.

There are 3 forward and 3 reverse speed ranges.

For details of the maximum speed in each speed range, see

“SPECIFICATIONS (5-2)“.

REMARK
The speed range being used is displayed on panel A on the monitor panel according to the gearshift operation.
<Example>
Neutral: N is displayed on the display panel.
FORWARD 2nd: F2 is displayed on the display panel.
REVERSE 3rd: R3 is displayed on the display panel.
When the parking brake lever is locked, P is displayed.
For details of the method of shifting gears according to the shift mode, see the “SHIFTING GEARS (3-101)“. Shift
mode selection means that the selected speed range is displayed at the NEUTRAL position (N) before starting.

q Operating counterrotation turn

WARNING
When operating the counterrotation turn, if the load on the left and right is not balanced, the machine may
make a pivot turn, so check the ground conditions and be careful not to hit any obstacles when carrying
out the operation.

With the lever at the NEUTRAL position (N), move the lever
partially in the direction of turn. The left and right tracks will
rotate in opposite directions, and the machine will make a slow
counterrotation turn. If the lever is operated further, the speed
of the counterrotation turn will increase.

(R): Right counterrotation turn

(L): Left counterrotation turn

3-39
EXPLANATION OF COMPONENTS OPERATION

BRAKE PEDAL

WARNING
Do not place your foot on this pedal unnecessarily.

Depress the pedal (4) to apply the right and left brakes.

DECELERATOR PEDAL

WARNING
q Do not place your foot on this pedal unnecessarily.

q When passing over the top of a hill or when a load is dumped over a cliff, the load is suddenly
reduced, so there is danger that the travel speed will also increase suddenly. To prevent this, depress
the decelerator pedal to reduce the travel speed.

This pedal (5) is used when reducing the engine speed or stop-
ping the machine.

When switching between forward and reverse, or when stop-

ping the machine, use this pedal to reduce speed.

3-40
OPERATION EXPLANATION OF COMPONENTS

BLADE CONTROL LEVER

POWER ANGLE, POWER TILTDOZER

This lever (6) is used to lift, tilt or angle the blade.

q Lifting control

(A) RAISE: Blade goes up

(B) HOLD: Blade is stopped and held in this position.

(C) LOWER: Blade goes down

(D) FLOAT: Blade will move freely according to external force.

REMARK
When released from FLOAT position, this lever will not return to
HOLD position, so it must be moved back by hand.
If the engine is stopped when the lever is at the FLOAT posi-
tion, the control lever will automatically return to the HOLD
position.
Before starting the engine, check that the blade control lever is
at the HOLD position.
In cold weather, it will take time for the lever to be held at the
HOLD position, so hold the lever by hand at the HOLD position
for at least 1 second.

q Tilting control

(B) HOLD: Blade is stopped and held in this position.

(E) LEFT TILT

(F) RIGHT TILT

Amount of tilt
Condition of
STD blade Wide blade
blade
D61PX D61EX D61EX
600 mm 510 mm 600 mm
Right tilt
(23.6 in) (20.1 in) (23.6 in)
600 mm 510 mm 600 mm
Left tilt
(23.6 in) (20.1 in) (23.6 in)

3-41
EXPLANATION OF COMPONENTS OPERATION

q Angling control
Turn the knob to the right or left to angle the blade.

(G) LEFT ANGLE

(B) HOLD: Blade is stopped and held in this position.

(H) RIGHT ANGLE

REMARK
When performing only angling operation, be sure to set the
lever in the HOLD position and turn the knob to the right or left.
If the angling operation is performed while the lever is not in the
HOLD position (while either or both of lifting and tilting opera-
tions are performed), all of those operations can be continued,
but the moving speed of the blade is lowered. Select the opera-
tions according to the type of the work.
If the lifting or tilting operation is performed while angling oper-
ation is performed, the machine moves similarly to the above.

3-42
OPERATION EXPLANATION OF COMPONENTS

POWER TILTDOZER

This lever (6) is used to lift or tilt the blade.

q Lifting control

(A) RAISE: Blade goes up

(B) HOLD: Blade is stopped and held in this position.

(C) LOWER: Blade goes down

(D) FLOAT: Blade will move freely according to external force.

REMARK
When released from FLOAT position, this lever will not return to
HOLD position, so it must be moved back by hand.
If the engine is stopped when the lever is at the FLOAT posi-
tion, the control lever will automatically return to the HOLD
position.
Before starting the engine, check that the blade control lever is
at the HOLD position.
In cold weather, it will take time for the lever to be held at the
HOLD position, so hold the lever by hand at the HOLD position
for at least 1 second.

q Tilting control

(B) HOLD: Blade is stopped and held in this position.

(E) LEFT TILT

(F) RIGHT TILT

Condition of Tilting distance

blade D61PX D61EX
440 mm 500 mm
Right tilt
(15.8 in) (19.7 in)
420 mm 440 mm
Left tilt
(16.5 in) (17.3 in)

3-43
EXPLANATION OF COMPONENTS OPERATION

CIRCUIT BREAKER 3
NOTICE
q When resetting the circuit breaker, always turn off the power first (turn the starting switch OFF).

q If the reset button for the circuit breaker comes out immediately when it is pushed in, it is necessary to
carry out an inspection of the electrical circuit.

If the starting switch does not work when it is turned to the ON position, the circuit has probably been cut off by the
circuit breaker.
Inspect the circuit breaker.

REMARK
The circuit breaker is a device installed in electric circuits where a large current flows. It is installed to protect the
electric circuit. It protects the electric components and wiring from damage caused by an abnormal current in the
same way as a normal fuse. After repairing and restoring the location of the abnormality, there is no need to
replace the breaker. It can be used again.

1. Open the cover at the bottom of the front panel. Circuit

breakers (1) and (2) can be seen.

(Circuit breaker (2) is installed only on machines equipped

with an air conditioner.)

2. When the circuit breaker has cut off the circuit, reset button
(3) springs out.
Push reset button (3) in.

Fuse
No Circuit
capacity
(1) 20A Starting switch
(2) 20A Air conditioner

3-44
OPERATION EXPLANATION OF COMPONENTS

FUSE 3
NOTICE
Before replacing a fuse, be sure to turn starting switch to the OFF position.

The fuses protect the electrical equipment and wiring from burning out.

If the fuse becomes corroded, or white powder can be seen, or the fuse is loose in the fuse holder, replace the
fuse.

Replace the fuse with another of the same capacity.

q Chassis
Fuse boxes (A) and (B) are installed under the battery cover.

q Cab (machines equipped with cab)

Fuse box (C) is installed in the overhead panel.

3-45
EXPLANATION OF COMPONENTS OPERATION

FUSE CAPACITY AND CIRCUIT NAME

Fuse box (A)

Fuse
NO. Circuit
capacity
(1) 20A Reserve
Horn, Heater relay
(2) 15A
Air suspension seat (OPT)
(3) 20A Front lamp, Rear lamp
(4) 20A Controller
(5) 10A Continuous power source

Fuse box (B)

Fuse
NO. Circuit
capacity
(1) 15A Monitor panel
(2) 10A PPC lock S/W
(3) 30A Air conditioner
(4) 10A Backup alarm
(5) 30A Body power source

Fuse box (C)

Fuse
NO. Circuit
capacity
(1) 10A Radio memory
(2) 20A Radio, lamp,cigarette lighter
(3) 20A Heated glass (if equipped)
(4) 10A Rear wiper
(5) 10A Front wiper
(6) 10A Left and right door wiper

3-46
OPERATION EXPLANATION OF COMPONENTS

FUSIBLE LINK 3
If the electrical equipment in the cab does not work or the battery is not charged, there is probably a disconnection
in the fusible link assembled in the wiring harness, so carry out inspection and replace if necessary.

REMARK
A fusible link refers to the large-sized fuse wiring installed in the high current flow portion of the circuit to protect
electrical components and wiring from burning, similar to an ordinary fuse.

q Fusible link (1)

Open the battery cover on the left side of the machine. Fusible
link (1) can be seen.

Capacity: 65 A

q Fusible link (2)

Open the engine side cover on the right side of the machine.
Fusible link (2) is on the right side of the starting motor.

Capacity: 65 A

3-47
EXPLANATION OF COMPONENTS OPERATION

ELECTRIC POWER TAKE-OUT ADAPTER 3

MACHINE EQUIPPED WITH CAB 3

NOTICE
The power for the cigarette lighter is 24V. Do not use it as
the power source for 12V equipment.

The cigarette lighter socket (1) can be used as a power source

for 24V equipment and the accessory socket (2) can be used
for 12V equipment.
Capacity of cigarette lighter : 120W (24V x 5A)

Capacity of accessory socket : 60W (12V x 5A)

MACHINE EQUIPPED WITH CANOPY 3

NOTICE
q Do not use as a power supply for 12V equipment.
This will cause failure of the equipment.

q When using as a power supply pickup, do not install equipment which exceeds 120W (24V x 5A).

1. Open the battery cover on the left side of the machine

body.

2. There is the connector for the spare power take-off.

(Connector CN800 (3) can be used.)

REMARK
Ground the negative wire to the body work or ROPS. Do not ground it to the rubber mounted engine or valves.
This will cause failures.
If the wire is grounded to a point where there is still paint, the electricity will not flow smoothly, so remove the paint.

3-48
OPERATION EXPLANATION OF COMPONENTS

DOOR - OPEN LOCK 3

(Machines equipped with cab)

Use this when your want to keep the door held open.

1. Push the door against the door catch (1). The door will be
held by the door catch.

2. To release the door, move lever (2) inside the cab to the
front of the cab. This will release the catch.

NOTICE
q When keeping the door open, fix it securely to the
catch.

q Always close the door when traveling or carrying out

operations. Leaving the door open will cause the door
to break.

q Keep the door locked open securely. The door may

swing closed because of the vibration.

SASH GLASS INTERMEDIATE LOCK 3

(Machines equipped with cab)

When working with the cab sash glass open, use this lock to
prevent the glass from chattering.
q When the lever is in the FREE position (F), the glass can
be opened or closed.

q When the lever is in the LOCK position (L), the glass is

held in position.

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EXPLANATION OF COMPONENTS OPERATION

CAP, COVER WITH LOCK 3

Use the starting switch key to open and close the caps and
covers.
For their locations , see “LOCKING (3-116)“.

Insert the key as far as it will go, then turn it. If the key is turned
before it is inserted fully, it may break.

METHOD OF OPENING AND CLOSING CAP WITH LOCK 3

TO OPEN THE CAP

1. Insert the key into the key slot.

2. Turn the key clockwise, align the key groove with mark (1)
on the cap, then open the cap.

Position (A): OPEN

Position (B): LOCK

TO LOCK THE CAP

1. Turn the cap until tight, then insert the key into the key slot.

2. Turn the starting switch key to LOCK position (B), then remove the key.

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OPERATION EXPLANATION OF COMPONENTS

METHOD OF OPENING AND CLOSING COVER WITH LOCK 3

TO OPEN THE COVER (LOCKED COVER)

1. Insert the key into the key slot.

2. Turn the key counterclockwise in direction (A), then pull the

cover knob to open the cover.

TO LOCK THE COVER

1. Close the cover and insert the key into the key slot.

2. Turn the key clockwise and take the key out.

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EXPLANATION OF COMPONENTS OPERATION

DOOR POCKET 3
(Machines equipped with cab)

This is inside the left and right doors. Use it for storing the
Operation and Maintenance Manual or other things.

Do not put heavy tools or other heavy objects in it.

If the pocket is dirty, turn 4 clips (1), then remove the pocket
and rinse it.

OPENING AND CLOSING ENGINE SIDE COVER 3

When opening

Pull door release lever (1) to release the lock, then pull the
cover up.

When closing

NOTICE
When closing the cover, always release the gas damper lock first.
If the gas damper lock is not released and any attempt is made to close the cover, the gas damper may
break.

Push the orange button in the center of the gas damper (1) to
release the lock, then push the cover down.

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OPERATION EXPLANATION OF COMPONENTS

ASHTRAY 3
This is on the left side of the operator's seat.
Always make sure that you extinguish the cigarette before clos-
ing the lid.

TOOL BOX 3
The tool box is inside the battery check cover at the rear left.
Keep the tools in this box.

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EXPLANATION OF COMPONENTS OPERATION

CAR STEREO, HANDLING 3

(Machine equipped with cab) (If equipped)

EXPLANATION OF COMPONENTS 3

(1) Power switch/volume (8) Cassette door

(2) Auto-store/preset scan button (9) Fast-forward, rewind buttons
(3) Bass control knob (10) Preset buttons
(4) Treble control knob (11) Metal tape button
(5) Loudness button (12) Manual tuning buttons
(6) Time/radio display selector button (13) Seek tuning buttons
(7) Tape eject button (14) Band selector button

(A) Band display (E) Tape direction display

(B) Metal tape display (F) Preset channel display
(C) FM stereo reception display (G) Time/frequency display
(D) Loudness display

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OPERATION EXPLANATION OF COMPONENTS

POWER SWITCH/VOLUME

Turn this knob (1) to the right until it clicks to turn the power on.

Turn it further to increase the volume.

AUTO-STORE/PRESET SCAN BUTTON

Use this button (2) to actuate the preset scan and auto-store
functions.

q Auto-store

Each time this button is pressed for more than 2 seconds

while in radio reception, this auto-store function automati-
cally starts to search for the desired station within a receiv-
able band, and memorize the frequency in the preset
memory. During this scanning process, the frequency
shown in the right side of display continues to change. This
indicates that each frequency is memorized in the auto-
store.

REMARK
The auto-store function cannot be used when the channel dis-
play is flashing.
When the display is flashing, the preset scan function is being
used.

q Preset scan
If this button is pressed for less than 0.5 second while in radio reception, programs from the six preset stations
in the same band will be broadcast one after another for 5 seconds each, starting from No. 1 through No. 6
stations consecutively.

When the desired station is found, press the button again. This stops the preset scan tuning process and
switches to ordinary broadcasting. The same process will be repeated continuously until the button is pressed
again.

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EXPLANATION OF COMPONENTS OPERATION

BASS CONTROL KNOB

Turn this button (3) to the left to reduce the low tones; turn it to
the right to emphasize the low tones.

Direction (a): Low tone reduced

Direction (b): Low tone emphasized

TREBLE CONTROL KNOB

Turn this button (4) to the left to reduce the low tones; turn it to
the right to emphasize the high tones.

Direction (a): High tone reduced

Direction (b): High tone emphasized

LOUDNESS BUTTON

This button (5) is used when playing at low volume. It makes it

possible to hear more easily by emphasizing the low tone when
the low tones are weak.

Push button: Actuated (ON)

Push button again: Canceled (OFF)

TIME/RADIO DISPLAY SELECTOR BUTTON

This button (6) is used to switch between the “Radio/tape dis-

play“ and the “Time display“.

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OPERATION EXPLANATION OF COMPONENTS

q Correcting the time

Press the button to set the time display.

(A) Correcting hour:

Keep the DISP button pressed and press the bottom (H) of
the TUNING button to correct the hour.

(B) Correcting minute:

Keep the DISP button pressed and press the top (M) of the
TUNING button to correct the minute.

TAPE EJECT BUTTON

This button (7) is used to stop the tape and to eject the cas-
sette.

When this button is pressed, the tape is ejected and the radio
plays.

CASSETTE DOOR

Set the cassette with the exposed portion of the tape on the
right side and insert it through the cassette door (8).

FAST FORWARD, REWIND BUTTONS

These buttons (9) are used to fast-forward or rewind the tape.

q Fast-forward/rewind

If you press the button pointing in the same direction as the

lighted arrow indicating the direction of play, the tape will
be fast-forwarded; if you press the button pointing in the
opposite direction, the tape will rewind.
To stop the tape, lightly press the button that is not locked.
The fast-forward or rewind operation will be canceled.

If the fast forward and rewind buttons are pressed at the

same time, the tape will change sides.

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EXPLANATION OF COMPONENTS OPERATION

PRESET BUTTONS

These buttons (10) are used to call up the broadcast station

frequencies preset in memory for each of buttons No. 1 to No.
6.

It is possible to preset 18 stations (FM: 12; AM: 6) with these

buttons.

METAL TAPE BUTTON

(used also for preset button No. 5)

This button (11) is used when playing a metal or chrome tape.

This button is also used for preset button No. 5. When it is
pressed, “MTL“ appears on the display.

MANUAL TUNING BUTTONS

These buttons (12) are used for manual tuning.

When “∧“ button is pressed, the frequency goes up; when “∨“
button is pressed, the frequency goes down. If the button is
pressed down and held, the frequency will change continu-
ously.

SEEK TUNING BUTTONS

These buttons (13) are used to seek tuning.

When the “SEEK UP“ button is pressed, the search automati-
cally goes up; when the “SEEK DOWN“ button is pressed, the
search automatically goes down.

When the next station that can be received is found, it automat-

ically stops.

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OPERATION EXPLANATION OF COMPONENTS

BAND SELECTOR BUTTON

When this button (14) is pressed, the band is switched between

FM1, FM2, and MW (AM). The band is shown on the display.

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EXPLANATION OF COMPONENTS OPERATION

METHOD OF OPERATION 3

METHOD OF SETTING PRESET BUTTONS

It is possible to preset 6 MW (AM) stations and 12 FM stations (FM1: 6 stations, FM2: 6 stations).

REMARK
If you are playing the cassette, press the tape eject button to stop the tape.

METHOD OF AUTO PRESET

1. Use band selector button (1) to select MW (AM), FM1 or

FM2.

2. Press auto-store/preset scan button (2) for less than 0.5

second.

3. The preset scan tuning function automatically searches for

the desired station within the same band and can memo-
rize as many as six stations in the preset memory.

METHOD OF MANUAL PRESET

1. Use band selector button (1) to select MW (AM), FM1 or

FM2.

2. Press manual tuning buttons (2) or seek tuning buttons (3).

3. Press preset button (4) of the number to be preset for 2

seconds while the frequency display is being shown on the
display. (The preset channel and frequency are displayed
and the presetting is completed).

4. Repeat the steps explained in Item 2 and 3 above to preset

other stations to the subsequent numbers.

5. If you want to preset a station in the other bands, follow the

steps explained in Item 1 through 4 above.

REMARK
Also, use Steps 2 and 3 when changing the setting of a preset
switch to another station.
When the power is disconnected, such as when the battery is
replaced, all the settings are deleted, so preset the stations
again.

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OPERATION EXPLANATION OF COMPONENTS

LISTENING TO RADIO

1. Turn the starting switch ON, then turn power switch (1) ON.

2. Use band selector button (2) to select MW (AM), FM1 or

FM2.

3. Select the station with the preset buttons (3).

REMARK
In case you do not promptly remember the number assigned to
a certain preset station, press auto-store/preset scan button (4)
for less than 0.5 second. The preset six stations will broadcast
one after another for five seconds each. When the desired sta-
tion broadcasts, press the button again and scan tuning stops.

4. If you want to tune in to a station that is not preset, use

either seek tuning button (5) or manual tuning button (6).

5. Adjust the volume, balance, and tone as desired.

6. When turning the radio OFF, turn power switch (1) to the
left until it clicks.

REMARK
To switch to the radio when listening to a cassette, press the cassette eject button to stop the tape.
If you insert a cassette when listening to the radio, the tape will start to play.

LISTENING TO A CASSETTE TAPE

1. Turn the starting switch ON, then turn power switch (1) ON.

2. Set the cassette with the exposed portion of the tape on

the right side and push it past the cassette door. The tape
will automatically start playing.

If the arrow indicating the direction of play is pointing to the

right, the top side is being played; if the arrow is pointing to
the left, the bottom side is being played.

When the tape reaches the end, it is automatically

reversed and the other side starts to play.

3. When finishing with the tape, press the cassette eject but-
ton to eject the tape and automatically switch to the radio.

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EXPLANATION OF COMPONENTS OPERATION

REVERSING TAPE

When listening to the tape, press both FAST FORWARD,

REWIND buttons (A) and (B) at the same time lightly.

When this is done, the tape direction display will be reversed.

PRECAUTION WHEN USING 3

WARNING
q If a voltage greater than the specified voltage is input, it may cause fire, electrocution, or other failure.
Never input any voltage other than the specified voltage.

q Places inside the radio are under high voltage. Do not remove the cover.

q Do not carry out any modifications. This may cause fire, electrocution, or other failure.

q If the sound cannot be heard, nothing is displayed, or any other abnormality occurs, turn off the power
switch and ask your Komatsu distributor to make repairs without delay.

q Stow the antenna when traveling in places with low overhead clearance.

q To ensure safety during operations, keep the volume at a level where it is possible to hear other machines.

q If water gets inside the speaker case or radio (auto tuning), it may cause a serious problem, take care not to let
water get in these items.

q Do not wipe the scales or buttons with benzene, thinner, or any other solvent. Wipe with a soft dry cloth. Use
a cloth soaked in alcohol if the equipment is extremely dirty.

NOTICE
Handling cassette tape
Clean the tape head approx. once a month with a commercially available head cleaning tape.
Do not leave the tape any place where it is exposed to direct sunlight, any place that is excessively dusty,
or any place where there is a magnetic field.
Do not use 120-minute tapes. The tape is thin and it easily gets caught up inside the machine.
If the tape is slack, it easily gets caught up inside the machine. Use a pencil to wind in the tape to remove
any slack.
Do not use any cassette tape if the label has started to come off. It may cause defective rotation, or it may
be impossible to get the tape out of the machine.

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OPERATION EXPLANATION OF COMPONENTS

AIR CONDITIONER, HANDLING 3

(Machine equipped with cab) (If equipped)

By taking fresh air into the cab through a filter, it is possible to raise the pressure inside the cab. This makes it pos-
sible to provide a pleasant working environment even on dusty jobsites.

GENERAL LOCATIONS AND FUNCTION OF CONTROL PANEL 3

(1) Fan switch (4) Temperature control switch

(2) Air conditioner switch (5) Defroster
(3) Fresh/recirc selector switch (6) Air flow to foot

FAN SWITCH

This switch (1) can be used to adjust the airflow in four stages.

It also acts as the main switch for the air conditioner. When the
OFF switch is pressed, the fan stops.
When the switch is pressed, the indicator lamp above the
switch lights up to display the airflow.

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EXPLANATION OF COMPONENTS OPERATION

AIR CONDITIONER SWITCH

This switch (2) is used to start or stop the cooling or dehumidi-

fying function.

When the fan switch is turned ON and the air conditioner

switch is pressed, the indicator lamp above the switch lights up.
When the switch is pressed again, the switch is turned OFF
and the indicator lamp goes out.

FRESH/RECIRC SELECTOR SWITCH

This switch (3) is used to select between recirculation of the air

inside the cab or intake of fresh air from outside.

When the switch is pressed, indicator lamp (A) at the top of the
switch lights up.

Recirculation of air inside cab

Press this switch (B) to use only the air inside the cab. Use this position to carry out rapid heating or cooling of the
cab or when the outside air is dirty.

Intake of fresh air from outside

Press this switch (C) to carry out heating or cooling with fresh air taken in from the outside. Use this position when
fresh air is taken in from outside the cab, or when removing the mist from the cab windows.

REMARK
When fresh air is taken into the cab, air pressure in the cab increases, which prevents the dust from entering.
When neither heating nor cooling is needed, bring in clean fresh air to prevent the dust from coming in with your
preferred airflow.

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OPERATION EXPLANATION OF COMPONENTS

TEMPERATURE CONTROL SWITCH

The temperature can be adjusted with this switch (4) gradually

from low temperature to high temperature.

The temperature level indicator lamps (A) light up to display the

temperature of the air coming from the vents.

The more blue lamps on, the lower the temperature is.

The color of the indicator lamp (A) changes while the switch is
being pressed.

When the temperature reaches the desired level, release the

switch to set the temperature.
The settings for each mode are retained in memory even when the starting switch is turned OFF.

However, in the following cases, the settings must be made again.

q When the machine has been out of use for more than 7 days

q When the battery voltage is extremely low

q When there has been abnormal interference from outside

q When the fan switch is turned OFF (the setting is not kept in memory with only the air conditioner switch)

If the air conditioner is used in the FRESH position, the inside of the cab will be pressurized and this will prevent
the entry of dust.

The higher the position of the fan switch, the more effective the pressurizing becomes.

3-65
EXPLANATION OF COMPONENTS OPERATION

METHOD OF OPERATION 3

SwitchsCondition of Air conditioner Temperature FRESH/RECIRC

Fan switch
use switch control switch selector switch
Rapid HI ON All blue RECIRC
Cooling More than half
Normal HI - LO ON FRESH
are blue
Dehumidifying, heat- More than half
HI - LO ON FRESH
ing are red
Rapid HI OFF All red RECIRC
Heating More than half
Normal HI - LO OFF FRESH
are red
More than half
Defroster HI ON FRESH
are red
Vetilation or pressur-
HI - LO OFF All blue FRESH
izing

When defrosting, set the temperature control switch so that all

lamps are red. This will improve defrosting and demisting.

WHEN NOT USING THE AIR CONDITIONER REGULARLY

Run the air conditioner at cooling or dehumidification + heating for several minutes from time to time to prevent the
loss of the oil film in various parts of the compressor.

REMARK
If the temperature inside the cab is low, the air conditioner may not work. In such cases, use the recirculated air to
warm up the inside of the cab, then turn the air conditioner switch on. The air conditioner will be run.

COOL BOX

When the cooling is being used, this can be used for keeping
drinks and other things cool.

When the heating is being used, it can be used to keep things

warm.

Do not use the cool box for things which smell or leak water or
break easily.

Do not use it as a holder for tools or other small objects.

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OPERATION EXPLANATION OF COMPONENTS

PRECAUTION WHEN USING AIR CONDITIONER 3

PRECAUTION WHEN USING COOLING OPERATION

q If you smoke when using the air conditioner, your eyes may start to itch or burn. Ventilate the cab ever so often
to remove the smoke.

q When using the air conditioner for a long period of time, carry out ventilation process at least once every hour.

When using the air conditioner, it is recommended for health reasons, that it should only feel slightly cooler (5 or
6°C (9 or 10.8°F) lower than the outside temperature) when you enter the cab.

Therefore, adjust the temperature to a suitable level.

SET SO THAT COLD AIR DOES NOT DIRECTLY BLOW ONTO THE GLASS SURFACE 3
q If the vents (left and right) in the middle of the dashboard are turned so that cold air plays directly on the cab
door glass, moisture may condense on the outside of the cab door glass and reduce the visibility. (This occurs
particularly in high temperatures.)

If this happens, close the louvers of the vent and change the direction to prevent the cold air from playing
directly on the surface of the glas

INSPECTION DURING OFF-SEASON 3

Even during the off-season, run the compressor at low speed for several minutes once a week to prevent the loss
of the oil film at the lubricated parts of the compressor. (Run the engine at low speed and set the temperature con-
trol lever at the central position.)

REMARK
When the ambient temperature is low, if the compressor is suddenly run at high speed, it may cause failure of the
compressor. Note that the system is set so that the compressor will not run when the cooler switch is turned on, if
the ambient temperature is less than 2 to 6.5°C (35.6 to 43.7°F).

PROCEDURE FOR REPLACING RECEIVER 3

Replace the receiver once every two years.

After replacing the receiver, add compressor oil. Turn the receiver at an angle and measure the oil remaining
inside the receiver, then add the same amount of oil (Denso Oil 6) to fill the receiver.

REMARK
The replacement interval may become shorter depending on the conditions during use.
If the receiver is used when the moisture absorption limit of the desiccant has been exceeded, the refrigerant cir-
cuit may become blocked and cause the compressor to break down.

PRECAUTIONS WHEN REPLACING RECEIVER

q If the receiver is left for more than 15 minutes with the blind cover removed, the moisture in the air will be
absorbed, and this will reduce the life of the desiccant. If you remove the blind cover, connect the piping
quickly, evacuate the system and fill with refrigerant.
q When removing the refrigerant from the refrigerant circuit, release it gradually from the low pressure side to
prevent oil from flowing out.

CHECK COMPRESSOR BELT TENSION AND REFRIGERANT (GAS) LEVEL 3

If the compressor belt is loose, or the refrigerant level is low, cooling is not carried out efficiently.

For details, see “WHEN REQUIRED (4-19)“.

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EXPLANATION OF COMPONENTS OPERATION

CLEANING AIR FILTER 3

If the air filter for the FRESH or RECIRC air intake becomes clogged, the cooling or heating capacity will drop.

To prevent this, clean the air filter with compressed air once a week.
For details of the cleaning method, see “WHEN REQUIRED (4-19)“.

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OPERATION EXPLANATION OF COMPONENTS

ACCUMULATOR, HANDLING 3
(If equipped)

WARNING
The accumulator is charged with high-pressure nitrogen gas, so mistaken operation may cause an explo-
sion, which will lead to serious injury or damage. When handling the accumulator, always do as follows.
The pressure in the control circuit cannot be completely removed. When removing the hydraulic equip-
ment, do not stand in the direction that the oil spurts out when carrying out the operation.
Loosen the bolts slowly.
Do not disassemble the accumulator.
Do not bring it near flame or dispose of it in fire.
Do not make holes in it or weld it.
Do not hit it, roll it, or subject it to any impact.
When disposing of the accumulator, the gas must be released. Please contact your Komatsu distributor to
have this work carried out.

The accumulator is a device to store the pressure in the control

circuit, and when it is installed, the control circuit can be oper-
ated for a short time even after the engine is stopped.

Therefore, if the control lever is moved in the direction to lower

the work equipment, it is possible for the work equipment to
move under its own weight.

The accumulator is installed in the position shown in the dia-

gram on the right.

METHOD OF RELEASING PRESSURE IN OPERATING CIRCUIT ON MACHINE EQUIPPED

WITH ACCUMULATOR 3
1. Lower the work equipment and stop the engine.

2. After stopping the engine, operate control lever full strokes

to the front, rear, left, and right to release pressure inside
the work equipment circuit.
However, the pressure cannot be completely released, so
if accumulator in the work equipment circuit is removed,
loosen the screws slowly, and never stand in the direction
oil spurts out.

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EXPLANATION OF COMPONENTS OPERATION

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OPERATION EXPLANATION OF COMPONENTS

3-71
OPERATION OPERATION

OPERATION 3

CHECK BEFORE STARTING ENGINE, ADJUST 3

WALK-AROUND CHECK 3
Before starting the engine, look around and under the machine to check for loose nuts and bolts, or leakage of oil,
fuel, or coolant, and check condition of the work equipment and hydraulic system. Also check for loose wiring,
play, and accumulation of dust at places which high temperatures.

WARNING
q Leakage of oil or fuel, or accumulation of flammable material around high temperature parts, such as
the engine muffler or turbocharger, may cause fire.
Check carefully, and if any problem is found, repair it or contact your Komatsu distributor.

q Do not get on or off the machine from the rear. Using this position is dangerous because it is easy to
slip and you cannot be seen from the operator's compartment. Always use the handrail and step at the
front when getting on or off the machine.

If the machine is at an angle, reposition it level before checking.

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 that there are no cracks, excessive wear, or play in the work equipment, cylinders, linkage, or 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 flammable material (dry leaves,
twigs, etc.) around the battery, engine muffler, turbocharger, or other high temperature engine parts. If any dirt
or flammable materials are found, remove them.

3. Check for coolant and oil leakage around the engine.

Check for oil leakage from the engine and coolant leaks from the cooling system. If any problem is found,
repair it.

4. Check for oil leakage of oil from power train case, final drive case, hydraulic tank, hoses, and joints
Check that there is no oil leakage. If any problem is found, repair the place where the oil is leaking.

Check for leakage of oil from the undercover. Check the ground for traces of oil leakage.

5. 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.

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OPERATION OPERATION

6. Check for problems in handrails, steps, loose bolts.

If any problem is found, repair it. Tighten any loose bolts.

7. Check for problems in gauges and monitor

Check that there is no problem in the gauges and monitor in the operator's cab. If any problem is found,
replace the parts. Clean off any dirt on the surface.

8. Seat belt and mounting clamps

Check for damage or wear to the seat belt and mounting clamps. If there is any damage, replace with new
parts.

3-73
OPERATION OPERATION

CHECK BEFORE STARTING 3

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

CHECK COOLANT LEVEL, ADD COOLANT

WARNING
q Do not open the radiator cap unless necessary. Wait for the engine to cool down before checking the
coolant in the subtank.

q Immediately after the engine is stopped, the coolant is at a high temperature and the radiator is under
high internal pressure. If the cap is removed to check the coolant level in this condition, there is a
hazard of burns. Wait for the temperature to go down, then turn the cap slowly to release the pres-
sure before removing it.

1. Open the engine side cover on the left side of the chassis,
and check that the coolant is between the FULL and LOW
marks on sub-tank (1). If the water level is low, add water
to the FULL level through the water filler port in sub-tank
(1).

REMARK
In summer, the coolant may overflow from the sub-tank drain
hose. This is no problem. It occurs because too much coolant
has been added.

2. After adding coolant, tighten the cap securely.

3. If the sub-tank is empty, check for leakage of coolant, then

add it to the radiator and sub-tank.

4. After adding coolant, close the engine side cover.

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OPERATION OPERATION

CHECK OIL LEVEL IN ENGINE OIL PAN, ADD OIL

WARNING
Parts and oil are at high temperature immediately after the engine is stopped and may cause serious
burns. Wait for the oil temperature to go down before performing this operation.

1. Open the engine side cover on the left side of the chassis.

2. Remove dipstick (G) and wipe the oil off with a cloth.

3. Fully insert dipstick (G) into filler pipe (F), then remove it.

4. The oil level should be between the MAX and MIN marks
on dipstick (G).

If the oil level is below the MIN mark, add engine oil
through oil filler (F).

5. If the oil level is above the MAX mark, remove cover (1) at
the bottom of the machine.

Loosen drain valve (P), drain the excess oil, then check the
oil level again.

6. If the oil level is correct, tighten the oil filler cap securely
and close the engine side cover.

REMARK
If the machine is at an angle, reposition it to level before checking.
When checking the oil level after the engine has been operated, allow the engine to cool for 15 minutes before
checking.

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OPERATION OPERATION

CHECK DUST INDICATOR

1. Open engine side cover on the left side of machine.

2. Check if a yellow piston in the display of dust indicator (1)

has moved into the red area (7.5 kPa).

3. If the yellow piston has already moved into the red area
(7.5 kPa), either clean the filter element or replace it with
new one immediately.
For cleaning the filter element, refer to the section,
“CHECK, CLEAN AND REPLACE AIR CLEANER ELE-
MENT (4-19)“, in this manual.

4. After checking, cleaning, and replacing, press the knob of

dust indicator (1) to return the yellow piston to its original
position.

CHECK, DRAIN WATER SEPARATOR

The water separator separates the water from the fuel.

1. Open the inspection cover (1) on the rear of the machine

2. Check that float (2) is still below water drain level (3).

If float (2) is above water drain level (3), drain the accumu-
lated water as follows.

3. Loosen drain plug (4) and drain the accumulated water

until the float (2) reaches the bottom.

4. Tighten drain plug (4).

5. If the air is sucked into fuel line when draining and water,
be sure to bleed air in the same manner as for the fuel fil-
ter. See “REPLACE FUEL FILTER CARTRIDGE (4-55)“.

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OPERATION OPERATION

CHECK OIL LEVEL IN POWER TRAIN CASE, ADD OIL

WARNING
The parts and oil are at high temperature after the engine
is stopped, and may cause serious burns. Wait for the tem-
perature to go down before starting the operation.

1. Open cover on the right side of the machine.

2. Remove dipstick (G), and wipe the oil off with a cloth.

3. Fully insert dipstick (G) into filler pipe (F), then remove it.

4. The oil level should be between the (H) and (L) marks on
dipstick (G).

If the oil level is below the (L) mark, add oil through oil filler
(F).

5. If the oil is above the (H) mark, drain the excess oil from
drain plug (P), then check the oil level again.

6. If the oil level is correct, insert dipstick (G) fully into the dip-
stick guide again.

REMARK
If the machine is at an angle, reposition it to level before check-
ing.
When checking the oil level after the engine has been oper-
ated, allow the engine to cool for 15 minutes before checking.

CHECK ELECTRIC WIRING

CAUTION
If the circuit breakers are activated and the fuses are blown frequently or there is a trace of short-circuit-
ing in the wirings, check the cause immediately and either correct it by yourself or call your Komatsu dis-
tributor for the repair.
Keep the top surface of the battery clean and check the breather hole in the battery cap. If it is clogged
with dirt or dust, wash the battery cap to clear the breather hole.

Check that the circuit breakers are in normal condition (with the red button pushed in), that the fuses have no dam-
age and fuses of the specified capacity are in use and that there is no trace of disconnection or short-circuiting in
the wirings and no damage in the covers. Moreover check the terminals for loosening and retighten loosened one,
if any.

Be particularly careful to check the wiring for the battery, starting motor, and alternator.

In addition, if any flammable material is accumulated around the battery, remove it.
For repairs or investigation of the cause, please contact your Komatsu distributor.

3-77
OPERATION OPERATION
CHECK BRAKE PEDAL TRAVEL

WARNING
If the brake pedal stroke is not 70 to 90 mm (2.8 to 3.5 in) (below 70 mm or over 90 mm), the brake and
steering force is too strong or insufficient. If the stroke is 91 mm (3.6 in) or longer, adjust it.

1. Depress the brake pedal all the way until it stops.

2. Check that the distance of travel (A) at the center of the
pedal is 70 to 90 mm (2.8 to 3.5 in).

3. When this value exceeds 91 mm (3.6 in), or the brake fails

to work, please contact your Komatsu distributor for adjust-
ment.

CHECKING WITH MACHINE MONITOR

1. Turn starting switch (1) to the ON position (B).

2. Check that all the monitors and gauges light up for approx.
2 seconds and the alarm buzzer sounds for approx. 2 sec.

REMARK
If the lamps do not light up, there may be a failure or discon-
nection in the monitor, please contact your Komatsu distributor.

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OPERATION OPERATION

CHECK FUEL LEVEL, ADD FUEL

WARNING
When adding fuel, never spill the fuel or let it overflow. It will 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 flames near fuel.

1. Turn the engine starting switch to the ON position and

check the fuel level gauge (G) on the monitor panel for fuel
level.

After checking, turn the switch back to the OFF position.

2. After completing work, fill the fuel tank through fuel filler
port (F).
Fuel capacity: 390 liters (103.04 US gal)

3. After adding fuel, tighten the cap securely.

REMARK
When dozing on a grade, make sure there is plenty of fuel in
the tank so that the engine fuel line does not become aerated.
If breather hole (1) on the cap is clogged, the pressure in the
tank will drop and fuel will not flow.
Clean the hole from time to time.

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OPERATION OPERATION

CHECK HORN SOUND

Check that the horn sounds. If it does not sound at all or the sound is extremely feeble, a defect or broken wire is
suspected, ask your Komatsu distributor for possible repairs.

1. Turn starting switch to the ON position (B).

2. Push the horn switch and check that the horn sounds.

CHECK THAT LAMPS LIGHT UP

Check that the head lamp, rear lamp, additional working lamp (if equipped), and instrument lamp light up normally
and they are free from stain and damage.

If the lamps do not light, check for a broken bulb or disconected wire, contact your Komatsu distributor for repairs.

1. Turn starting switch to the ON position (B).

2. Turn the Head lamp and Rear lamp switches to the ON ( I )

position, and check that all the lamps light up.

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OPERATION OPERATION

CHECK OF OPERATION OF BACKUP ALARM

Check that the backup alarm sounds normally. If it does not, a defect or broken wire is suspected, ask your
Komatsu distributor for possible repairs.

1. Turn starting switch to the ON position (B).

2. Set the steering, forward-reverse, gear shift lever in the

REVERSE position (R).

The alarm must sound immediately at this time. The alarm

keeps sounding until the steering, forward-reverse, gear
shift lever is set to the NEUTRAL position (N) or FOR-
WARD position (F).

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OPERATION OPERATION

ADJUSTMENT 3

ADJUST OPERATOR'S SEAT

WARNING
When adjusting the position of the operator's seat, always set the work equipment lock lever to the LOCK
position to prevent any accidental contact with the control levers.

q Always adjust the operator's seat before starting each operation or when the operators change shift.
q When adjusting the seat, put your back against the backrest and adjust to a position where the brake pedal
can be fully depressed.

(A) Fore-and-aft adjustment

Pull lever (1), set the seat to a position where it is easy to oper-
ate, then release the lever.

Fore-aft adjustment: 160 mm (6.3 in) (8 stages)

(B) Weight adjustment of seat

Turn knob (2) under the seat to match the weight adjustment
scale with your own weight.

The weight can be adjusted to 50 to 120 kg (110 to 265 lb).

REMARK
If you want to make the seat softer, turn the weight adjustment
to a lower weight; if you want to make the seat harder, adjust to
a higher weight.When operating on uneven surfaces, adjust the
seat to a harder setting.

(C) Adjust reclining angle

Pull up lever (3) and set the seat back to a position which is
comfortable for operation, then release the lever.
Sit with your back against the seat back when adjusting. If your
back is not touching the seat back, the seat back may suddenly
move forward.

REMARK
The seat can be reclined more when the seat is pushed to the front. The amount of reclining decreases as the seat
is pushed back, so when moving the seat back, return the seatback to the upright position.

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OPERATION OPERATION

(D) Seat angle adjustment

q Front angle adjustment of seat (5 stages)

To raise the front of the seat, apply your weight to the seatback, while pulling up lever (4).

To lower the front of the seat, apply your weight to the front of the seat, while pulling up lever (4).

q Rear angle adjustment of seat (5 stages)

To raise the rear of the seat, stand up on your feet a little, while pulling up lever (5).

To lower the rear of the seat, apply your weight to the rear of the seat, while pulling up lever (5).

(E) Seat height adjustment

Pull up levers (4) and (5) alternately to adjust the angle of the seat.

Then, release the levers to lock the seat.

(Height adjustment distance: 5 stages, 60 mm (2.4 in))

3-83
OPERATION OPERATION

FASTENING AND REMOVING SEAT BELT

WARNING
q Before fastening the seat belt, check that there is no problem in the securing brackets or belt. If there
is any wear or damage, replace.

q Even if there appears to be no problem in the seat belt, replace the seat belt once every 3 years. The
date of manufacture is woven on the reverse side of the belt.
q Adjust and fasten the seat belt before operating the machine.

q Always use the seat belt when operating the machine.

q Do not use the seat belt with either half of the belt twisted.

Check that the bolts of the clamp securing the belt to the chassis are not loose. Tighten them if they are loose.
The tightening torque for the mounting bolt is 24.5 ± 4.9 N·m (2.5 ± 0.5 kgf·m, 18.1 ± 3.6 lbft).

If the belt surface is scratched or frayed or if the fittings are broken or deformed, replace the seat belt unit.

FASTENING AND REMOVING SEAT BELT

1. After adjusting the seat position, adjust tether belt (1).

Tense the tether belt and install it when there is no one sit-
ting on the seat.

2. Sit on the seat and hold tongue (4) connected to wind-in

mechanism (2) and pull out the belt slowly so that the belt
will cover your abdomen sufficiently.

3. Insert tongue (4) in buckle (3) until it clicks. The belt is

pulled back into wind-in mechanism (2) until it is fitted to
your abdomen. The belt is locked under this condition and
cannot be extended anymore. Fit the belt to your abdomen
without twisting it.

REMARK
If the belt is locked before the tongue is inserted in the buckle, let it return to the wind-in mechanism, then repeat
the above procedure from the start.

4. Pull the belt to check that it is securely locked in position.

5. When removing the belt, press the red button on buckle (3).

The belt will automatically be wound in.

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OPERATION OPERATION

ADJUST MIRROR

Loosen nut (1) of the mirror and adjust the mirror to a position
where it gives the best view from the operator's seat.

In particular, be sure to adjust the mirror so that people at the

rear left or right of the machine can be seen clearly.

ADJUST LEFT CONSOLE BOX

WARNING
q Before adjusting the position of the left console box, always set the parking brake lever to the LOCK
position.

q After adjusting the position of the left console box, push and pull the console box to the front and rear
to check that it is locked and cannot move. If it is not locked properly, the console box may suddenly
move during operations, causing misoperation of the steering, forward-reverse, gear shift lever, and
resulting in failure.

The left console box can be adjusted by 90 mm (3.5 in) in 9 stages to the front or rear. Adjust it to the most suit-
able position to match the adjustment of the operator's seat.

1. Pull up lock lever (2) at the rear of console box (1) at the
left side of the operator's seat, and set the lock lever to the
FREE position.

NOTICE
Do not grip the steering, forward-reverse, gear shift lever
when removing console box (1). There is danger that the
lever may break.

2. With the lock lever (2) pulled up, use your other hand to
grip the front of console box (1), then move it to the front or
rear with your left and right hands.

3. Move console box (1) to the desired position until a click is

heard. Then pull up lock lever (2) and release it. Lock
lever (2) automatically returns to LOCK position (L).

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OPERATION OPERATION

ADJUST ARMREST

The height of the armrest on the left and right sides of the operator's seat can be adjusted to 3 positions. After
adjusting the operator's seat, adjust the armrest to a suitable height.

ADJUST ARMREST (RIGHT)

Armrest (1) on the right side of the operator's seat can be adjusted in 3 stages: up 30 mm (1.2 in), standard height
(center), or down 25 mm (1.0 in).

1. Loosen knob (2) (2 places).

2. Move the armrest on the operator's seat to the front, then

align the position of the 3 holes ((A), (B),(C)).

3. Return the armrest to the rear.

4. Tighten knob (2) securely.

ADJUST ARMREST (LEFT)

The height of the armrest on the left side of the operator's seat can be adjusted steplessly up and down 60 mm
(2.4 in) together with the console box.

Turn up/down left adjustment knob (1) to adjust the height.

Turn the knob to adjust as follows.

Turn CLOCKWISE to move DOWN

Turn COUNTERCLOCKWISE to move UP

3-86
OPERATION OPERATION

OPERATION AND CHECK BEFORE STARTING ENGINE 3

WARNING
When starting the engine, check that the work equipment lock lever are placed securely at the LOCK posi-
tion. If the work equipment control lever is touched by accident when the engine is started, the work
equipment may move unexpectedly and cause serious injury or damage.

1. Check that parking brake lever (1) is in the LOCK position

(L).

REMARK
If this parking brake lever is not in the LOCK position, the
engine will not start.

2. Check that steering, forward-reverse, gear shift lever (2) is

in the NEUTRAL position (N).

REMARK
The engine cannot be started if steering, forward-reverse, gear
shift lever (2) is not in the NEUTRAL position.
If steering, forward-reverse, gear shift lever (2) is in FORWARD
or REVERSE, the letter P on display panel A will flash.

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OPERATION OPERATION

3. Check that the blade is lowered to the ground and that

blade control lever (3) is in the HOLD position (B).

4. Check that the work equipment lock lever (4) is LOCK posi-
tion (L).

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OPERATION OPERATION

STARTING ENGINE 3

NORMAL STARTING 3

WARNING
q Sit down in the operator's seat before starting the engine.

q Do not attempt to start the engine by short-circuiting the engine starting circuit. Such an act may
cause serious bodily injury or fire.

q Check that there are no persons or obstacles in the surrounding area, then sound the horn and start
the engine.
q Exhaust gas is toxic. When starting the engine in confined spaces, be particularly careful to ensure
good ventilation.

NOTICE
q Do not continue to crank the starting motor continu-
ously for more than 60 seconds under any circum-
stances. If the engine does not start, wait for at least 2
minutes, then repeat the procedure from Step 2.

q Before starting the engine, check that the fuel control

dial is at the low idle (MIN) position.

q If the fuel control dial is in the FULL position, the

engine will accelerate suddenly and cause damage to
the engine parts, so set it to an intermediate or low
speed position.

1. Turn fuel control dial (1) from the low idle (MIN) position to
a slightly higher speed.

2. Insert the key into starting switch (2) and turn the key to the
START position (C). The engine will start.

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OPERATION OPERATION

3. When the engine starts, release the key in starting switch

(2). The key will return automatically to the ON position (B).

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OPERATION OPERATION

STARTING IN COLD WEATHER 3

WARNING
q Start the engine only after sitting down in the operator's seat.

q Do not attempt to start the engine by short-circuiting the engine starting circuit. Such an act may
cause a serious bodily injury or fire.

q Check that there are no persons or obstacles in the surrounding area, then sound the horn and start
the engine.
q Never use starting aid fluids as they may cause explosions.

q Exhaust gas is toxic. When starting the engine in confined spaces, be particularly careful to ensure
good ventilation.

NOTICE
q Do not continue to crank the starting motor continu-
ously for more than 60 seconds under any circum-
stances. If the engine does not start, wait for at least 2
minutes, then repeat the procedure from Step 2.

q Before starting the engine, check that the fuel control

dial is at the low idle (MIN) position.

q If the fuel control dial is in the FULL position, the

engine will accelerate suddenly and cause damage to
the engine parts, so set it to an intermediate or low
speed position.

1. Turn fuel control dial (1) to the center position between MIN
and MAX position.

2. Insert the key into starting switch (2) and turn the key to the
ON position (B).

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OPERATION OPERATION

3. Check that engine pre-heating pilot lamp (3) on the monitor

panel lights up.

4. Maintain the key in the on position until the preheating pilot

lamp (3) goes off.

5. When preheating pilot lamp (3) goes off, turn the key of ignition switch (2) to the START position (C) to crank
the engine.

The time that preheating pilot lamp (3) stays on changes according to the ambient temperature as shown in
the table below.

Ambient temperature Preheat time

-5°C to -10°C (23°F to 14°F) 20 to 25 seconds
-10°C to -20°C (14°F to -4°F) 25 to 40 seconds
-20°C to -30°C (-4°F to -22°F) 40 to 45 seconds

6. When the engine starts, release the key in starting switch

(2). The key will return automatically to the ON position (B).

REMARK
Immediately after starting the engine, run at idle. While running the engine, release the decelerator pedal and do
not operate the work equipment.
Guideline for idle time
Cold weather: At least 15 seconds
1st start after changing engine oil or engine oil filter: 20 seconds

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OPERATION OPERATION

7. When the engine rotation stabilizes, return to the low idle (MIN) position of fuel control dial (1) and then carry
out the warming-up operation.

REMARK
Regardless of the ambient temperature, if the key in starting
switch (2) is turned from OFF position to left, preheating pilot
lamp (3) will light up and preheating will start. (Preheating con-
tinues while the starting switch is held at the left.)
For the details of the preheating time, see the table in Step 5.
While preheating is being carried out, the preheating pilot lamp
(3) lights up to show that preheating is being carried out.
If the engine does not start with the above operation, wait for
about 2 minutes, and repeat steps 3. And 4.

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OPERATION OPERATION

OPERATIONS AND CHECKS AFTER STARTING ENGINE 3

WARNING
q If there has been any abnormal actuation or trouble, turn the starting switch key to the OFF position.

q If the work equipment is operated without warming the machine up sufficiently, the response of the
work equipment to the movement of the control lever will be slow and the work equipment may not
respond as the operator desires, so always carry out the warming-up operation. Particularly in cold
areas, be sure to carry out the warm-up operation completely.

BREAKING IN THE NEW MACHINE 3

CAUTION
Your Komatsu machine has been thoroughly adjusted and tested before shipment. However, operating the
machine under severe conditions at the beginning can adversely affect the performance and shorten the
machine life.
Be sure to break-in the machine for the initial 100 hours (as indicated by the service meter).
During break-in operations, follow the precautions described in this manual.

q Idle the engine for 5 minutes after starting it up.

q Avoid operation with heavy loads or at high speeds.

q Immediately after starting the engine, avoid sudden starts, sudden acceleration, unnecessary sudden stops,
and sudden changes in direction.

WARMING UP OPERATIONS 3

NOTICE
Avoid abrupt acceleration until warm-up run is completed.
Do not run the engine at low idle or high idle for more than
20 minutes.
If it is necessary to run the engine at idle, apply a load or
run at a medium speed from time to time.

1. Turn fuel control dial (1) to the center position between

LOW IDLE (MIN) and HIGH IDLE (MAX) and run the
engine at medium speed for about 5 minutes with no load.

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OPERATION OPERATION

2. After warm-up run is completed, check gauges and caution

lamps for proper operation. If any abnormality is found,
repair it.

Continue to run the engine under a light load until engine

coolant temperature gauge indicator (2) is within the green
range (B).

(A): White range

(B): Green range

(C): Red range

3. Check for abnormal exhaust gas color, noise, or vibration. If any abnormality is found, contact your Komatsu
distributor.

STARTING IN COLD WEATHER 3

(Ambient temperature below 10°C (50°F))

NOTICE
q When the hydraulic oil is at a low temperature, do not
carry out operations or move the levers suddenly.
Always carry out the warm-up operation. This will help
to extend the machine life.

q Do not suddenly accelerate the engine before the

warm-up operation is completed.
Do not run the engine at low idle or high idle con-tinu-
ously for more than 20 minutes. This will cause leak-
age of oil from the turbocharger oil supply piping.
If it is necessary to run the engine at idle, apply a load
from time to time or run the engine at a mid-range
speed.

1. After starting the engine, run it for approx. 10 minutes under no load (warming-up operation).

2. Blade control lever (1) to the full RAISE position, then hold
the lever in position, and operate slowly to the left tilt relief
and right tilt relief positions for 5 minutes.
3. After this, operate the blade control lever (1) fully to the
RAISE position, hold the lever in position, and relieve the
left and right tilt intermittently. Next, move the lever to the
LOWER position and lower the blade to the ground, then
move the lever to the full FLOAT position, hold the lever in
position, and relieve the left and right tilt intermittently for 5
minutes.

4. Lower the blade to the ground, move the control lever fully (A) RAISE (D) FLOAT
to the FLOAT position (lever stroke end) and hold the lever (B) HOLD (E) LEFT TILT
in position for 1 minute. Next, release the lever and check (C) LOWEW (F) RIGHT TILT
that it stays in the FLOAT position. After waiting for 3 min-
utes, return the lever to the HOLD position.

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OPERATION OPERATION

5. After warm-up run is completed, check gauges and caution

lamps for proper operation. If any abnormality is found,
repair it.

q Continue to run the engine at light load until engine

coolant temperature gauge indicator (2) and Hydraulic
oil temperature gauge (3) fall within the green range
(B).

(A): White range

(B): Green range

(C): Red range

REMARK
If the oil temperature in the power train is not raised properly, it will take longer to accelerate to the maximum
speed.

6. Check for abnormal exhaust gas color, noise, or vibration. If any abnormality is found, contact your Komatsu
distributor.

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OPERATION OPERATION

STOPPING ENGINE 3
NOTICE
If the engine is abruptly stopped before it has cooled
down, engine life may be drastically shortened. Do not
abruptly stop the engine except for an emergency.
If the engine has overheated, do not stop it abruptly, run it
at medium speed allowing the engine to gradually cool
down, then stop it.

1. Lower the work equipment to the ground.

2. Place fuel control dial (1) in the low idle (MIN) position and
run the engine at low idle speed for about 5 minutes to
allow it to gradually cool down.

3. Turn the key in ignition switch (2) to the OFF position (A).

The engine will stop

REMARK
When the key in starting switch (2) is turned to the OFF posi-
tion, the engine stops, but the machine power supply is not cut
immediately.
The power supply is maintained for several seconds to enable
the controller to save the operating condition to memory and
shuts down the system after that. The length of time that the
power supply is maintained depends on the operating condi-
tion.
Even when the cooling fan is being operated in reverse or in
the cleaning mode, the machine power supply is not cut imme-
diately when the key in starting switch (2) is turned to the OFF
position.
The power supply is maintained for seven seconds to protect
the hydraulic circuit. During that time, the fan operation confir-
mation lamp on the monitor panel flashes.

4. Remove the key from starting switch (2).

3-97
OPERATION OPERATION

MACHINE OPERATION 3

MOVING MACHINE 3

WARNING
q When moving the machine, check that the area around
the machine is safe, and sound the horn before mov-
ing.
Do not allow anyone to enter the area around the
machine.
There is a blind spot at the rear of the machine, so be
particularly careful when traveling in reverse.

q When starting the machine off on a slope, set the park-

ing brake lever to the FREE position and always keep
the brake pedal depressed until the travel lever is oper-
ated to the FORWARD or REVERSE position. If the
brake is not applied, the machine will move under its
own weight and may hit people or objects in the sur-
rounding area and cause a serious accident.

1. Set the work equipment lock lever (1) to the FREE position
(F).

2. Put blade control lever (2) in the RAISE position (R) to

raise the blade 40 to 50cm (15.8 to 19.7 in) off the ground.

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OPERATION OPERATION

3. Set parking brake lever (3) to the FREE position (F).

REMARK
When starting the machine off on a steep slope, depress brake
pedal (4) before setting parking brake lever (3) to FREE posi-
tion (F).

4. Turn fuel control dial (5) to the full speed (MAX) position,
and fully depress decelerator pedal (6).

5. Move steering, forward-reverse, gear shift lever (7) to the

FORWARD position (F) or REVERSE position (R), gradu-
ally release the decelerator pedal (6) and allow the
machine to move.

REMARK
When starting the machine off on a steep slope, release brake
pedal (4) slowly, then release the decelerator pedal gradually.
Check that the backup alarm sounds when steering, forward-
reverse, gear shift lever (6) is placed in REVERSE position. If
the alarm does not sound, please contact your Komatsu distrib-
utor.

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OPERATION OPERATION

STOPPING MACHINE 3

WARNING
Avoid stopping suddenly. Give yourself ample room when stopping.

1. Depress brake pedal (1) to stop the machine.

NOTICE
If the brake is depressed when the engine speed or travel
speed is high, the brake disc may make a slipping sound.
Normally, depress decelerator pedal (2) to reduce the
engine speed and travel speed before depressing the
brake.

2. Move steering, forward-reverse, gear shift lever (3) to the

NEUTRAL position (N), depress brake pedal (1) further,
and stop the machine.

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OPERATION OPERATION

SHIFTING GEARS 3
The machine does not have to be stopped to shift gears.
1. Move steering, forward-reverse, gear shift lever (1) to the
desired gear position to shift gears.

GEARSHIFTING OPERATION 3

When UP switch (U) or DOWN switch (D) is pushed, the trans-

mission speed will change.
UP switch (U): Each time the switch is pressed, the transmis-
sion will up shift one speed.

DOWN switch (D): Each time the switch is pressed, the trans-
mission will down shift one speed.

There are 3 forward and 3 reverse speed ranges.

For details of the maximum speed in each speed range, see

“SPECIFICATIONS (5-2)“.

REMARK
The present speed range is displayed in the center of display
panel A (2).
1st: 1 is displayed
2nd: 2 is displayed
3rd: 3 is displayed
If the machine has failed, the speed range and speed range
display may change automatically.

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OPERATION OPERATION

GEARSHIFTING OPERATION USING PRESET MODE FUNCTION 3

If the preset mode function is used, the speed ranges used when the machine travels in forward and reverse can
be preset as desired.

1. Set steering, forward-reverse, gear shift lever (1) to the

NEUTRAL position (N).

2. When preset mode switch (3) is set to the ON position (a),

the function is actuated.

3. When the preset mode function is actuated, [F1-R1] is dis-

played at the left side of the bottom line of display panel B
(multi-information) on the monitor panel, and the [F1-R1]
mode is set.

REMARK
When preset mode switch (3) is set to the ON position (a), the
default [F1-R1] mode is set.

4. If it is desired to select another mode, press UP switch (U) or DOWN switch (D) on steering, forward-reverse,
gear shift lever (1) and display the desired mode on control panel B (multi-information).

The types of mode and method of selection are as follows.

UP UP UP
→ → →
｢ F1-R1 ｣ ｢ F1-R2 ｣ ｢ F2-R2 ｣ ｢ F2-R3 ｣
← ← ←
DOWN DOWN DOWN

q Example of shift control when [F2-R2] mode is set.

When steering, forward-reverse, gear shift lever is set to F position, speed range F2 is automatically selected.

When steering, forward-reverse, gear shift lever is set to R position, speed range R2 is automatically selected.

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OPERATION OPERATION

REMARK
Even when the preset mode function is being actuated, it is possible to select the speed range by operating the UP
switch or DOWN switch when the machine is traveling forward or in reverse.
However, the preset mode remains set as it is. If the steering, forward-reverse, gear shift lever is returned to the
NEUTRAL position and then operated again to the FORWARD or REVERSE position, the set speed range is
selected.
A particular advantage is that when the auto shift down function described below is being actuated, it is possible to
save the trouble of shifting up when traveling in reverse after the transmission has shifted down during digging.

AUTO DOWN SHIFT OPERATION 3

If the travel speed drops because of the load conditions when

traveling, this function automatically down shifts to a lower
speed range.

1. The function is actuated when auto shift down switch (4) on

the front panel is set to ON position (b).

OFF position (a) : Canceled

ON position (b) : Actuated

The transmission is automatically shifted down F2→ F1, F3

→ F2, R2 → R1, R3 → R2.

REMARK
When the preset mode is being actuated, to ensure safety, the
system is set so that it does not shift up after the auto shift
down has been actuated.
If it is desired to shift up, operate the UP switch (U) manually.
However, the preset mode remains set. If the steering, for-
ward-reverse, gear shift lever is returned to the NEUTRAL
position and then operated again to the FORWARD or
REVERSE position, the preset speed range is again selected.

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OPERATION OPERATION

SHIFTING BETWEEN FORWARD AND REVERSE 3

WARNING
When switching between FORWARD and REVERSE, check first that the direction of travel is safe.

CAUTION
The travel direction can be changed without stopping the
machine. Do not change it while the engine is running at
the full speed, however, but depress the decelerator pedal
to lower the engine speed before changing the travel
direction for safety, comfort, and longer life of the power
train.

1. Depress decelerator pedal (1) to reduce the engine speed.

2. Move steering, forward-reverse, gear shift lever (2) to the

NEUTRAL position (N), reduce the speed, then depress
brake pedal (3) and stop the machine.

3. After depressing decelerator pedal (1), move steering, for-

ward-reverse, gear shift lever (2) to the desired position.

Position (F): Forward

Position (N): Neutral

Position (R): Reverse

REMARK
Check that the backup alarm sounds when steering, forward-
reverse, gear shift lever is placed in REVERSE position. If the
alarm does not sound, please contact your Komatsu distributor.

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OPERATION OPERATION

4. Release decelerator pedal (1) and raise the engine speed.

REMARK
When changing direction between forward and reverse while traveling downhill, depending on the conditions of the
machine, to ensure safety, the gear may shift automatically to 1st before shifting to the desired range.
For example, when changing from F2 to R2, depending on the conditions, the gear may shift F2 o R1 o R2.

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OPERATION OPERATION

STEERING MACHINE 3

WARNING
q Avoid as much as possible turning the machine on a slope.
The machine will tend to slip sideways. Particular care should be taken on soft or clay land.

q Never make a pivot turn at high speed.

NORMAL TURNING 3

WARNING
When performing a counterrotation turn, the feeling of operation when your head is facing the rear is dif-
ferent from the feeling if you are facing the front. Never carry out a counterroatation turn while facing the
rear.

To turn the machine while traveling, incline steering, forward-

reverse, gear shift lever (1) in the direction to turn.

TURNING LEFT WHILE TRAVELING FORWARD

NOTICE
If the lever is moved partially to the forward or reverse
position and then is moved in the direction of turn, the
machine may carry out a counterrotation turn, so operate
the lever fully to the forward or reverse position.

If steering, forward-reverse, gear shift lever (1) is moved to the

FORWARD position (F) and moved partially to the left (L), the
machine will start to turn gradually. After that, the lever can be
moved further towards the end of its travel to set the desired
turning radius.

REMARK
To turn gradually to the right while traveling forward, if the
steering, forward-reverse, gear shift lever (1) is operated to the
FORWARD position (F) and moved slowly to the right, the
machine will start to turn gradually. After that, the lever can be
moved further towards the end of its travel to set the desired
turning radius.

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OPERATION OPERATION

WHEN MAKING PIVOT TURN TO LEFT WHILE TRAVELING

NOTICE
When carrying out a counterrotation turn, if the load is not
equal on the left and right sides, the machine may carry
out a pivot turn, so check the ground conditions and be
careful not to hit any obstacles.

With steering, forward-reverse, gear shift lever (1) in the N

position, operate the lever partially to the left (L). The left and
right tracks will rotate in opposite directions, and the machine
will make a slow counterrotation turn. If the lever is moved fur-
ther, the speed of the counterrotation turn will increase.

REMARK
When making a right counterrotation turn, move the steering,
forward-reverse, gear shift lever (1) to the right (R) in the same
way.

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OPERATION OPERATION

PRECAUTIONS FOR OPERATION 3

PAY ATTENTION TO GAUGES 3

When the red range lights on the power train oil temperature gauge while operating, reduce the load and wait for
the temperature to decrease.

PERMISSIBLE WATER DEPTH 3

When operating in water, always keep the bottom of carrier roll-

ers (1) above the surface of the water. Also, be careful that the
engine cooling fan will not come in contact with water. The fan
can be damaged.

After operating the machine for a long time in water, carry out
greasing of the greasing points.

PRECAUTIONS WHEN TRAVELING UP OR DOWN HILLS 3

METHOD OF USING DECELERATOR PEDAL

When stepping on the decelerator pedal while going uphill, climbing ability will be reduced and the machine will
stop.

Furthermore, the engine may stall.

USE ENGINE AS BRAKE

When going downhill, move steering, forward-reverse, gear shift lever into low speed to run engine at slow speed
and travel down slope using the engine as a brake.

Do not move the steering, forward-reverse, gear shift lever to the NEUTRAL position.

When traveling down hills of more than 15°, shift down to 1st speed (R1 or F2).

BRAKING WHEN TRAVELING DOWNHILL

While descending a slope using the engine as a brake, also apply the brakes.

Failure to brake may result in overrunning, causing engine trouble.

PRECAUTIONS ON SLOPES 3

BE CAREFUL OF FUEL LEVEL

If the fuel level in the fuel tank becomes low when working on slopes, the engine may suck in air because of the
angle of the machine or the swaying of the machine. If this makes the engine stop, the braking effect will be
reduced, so be careful not to let the fuel level in the fuel tank become too low.

BE CAREFUL OF OIL LEVEL

When operating machine on sloped areas of more than 20°, fill all appropriate components with oil to H level.

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OPERATION OPERATION

PRECAUTIONS WHEN ENGINE STOPS ON SLOPES

If the engine stops while working or traveling on a hill, immediately depress the brake pedal to bring the machine to
a complete stop.

METHOD OF USING BRAKES 3

The following actions cause premature damage to the brakes, so avoid such operations.

q Using emergency brake at full speed

q Using brake with engine running at full speed in first gear (F1, R1) (Machine stall condition)

REMARK
Always depress the decelerator pedal to lower the engine speed before actuating the brakes.

IT IS PROHIBITED TO KEEP THE DOOR OPEN DURING OPERATIONS 3

(Machines equipped with cab)

Always keep the door closed when traveling or carrying out operations.

If the door is open, there is danger of damage from obstacles or strong vibration.

IT IS PROHIBITED TO MODIFY THE CAB GLASS IN ANY WAY THAT WILL OBSTRUCT
THE VIEW 3
(Machines equipped with cab)

q For safety reasons, do not install anything to the cab glass that will obstruct the view.
q Always keep the glass clean to ensure safety during operations.

PRECAUTIONS FOR BLIND SPOTS CAUSED BY CAB AND ROPS STRUCTURES 3

(Machines equipped with cab)

WARNING
The cab structure may cause blind spots.
When operating, always be sure to check carefully that
there is no obstacle or worker in the surrounding area.

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OPERATION OPERATION

WORK POSSIBLE USING BULLDOZER 3

In addition to the following, it is possible to further increase the range of applications by using various attachments.

DOZING 3

A bulldozer digs and transports dirt in a forward direction.

Slope excavation can always be most effectively carried out by
proceeding from the top downward.

When dozing toward one side only, operate with angled blade
(angledozer only).

SMOOTHING 3
NOTICE
Avoid smoothing on rocky or stony ground. It can damage the blade.

To finish the ground to a flat surface after digging or leveling,

put a full load of soil in front of the blade and operate the blade
up and down in small movements while traveling forward.
Finally, place the blade at FLOAT and travel at low speed in
reverse while pulling the blade over the ground surface. Before
doing this, hold the lever by hand at the FLOAT position for at
least 1 second to make sure that it stays in position. To prevent
damage to the blade, be careful not to travel over any stones or
rocks.

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OPERATION OPERATION

CUTTING INTO HARD OR FROZEN GROUND OR DITCHING 3

For digging and ditch excavation of hard or frozen ground, tilt

the blade. Even hard ground can be dug effectively by a tilted
or angled blade.

FELLING TREES, REMOVING STUMPS 3

NOTICE
Do not uproot trees or stumps or fell trees by angling or tilting the blade.

For trees with a diameter of 10 to 30 cm (3.9 to 11.8 in), raise

the blade high and push 2 or 3 times to fell the tree.

Next, travel in reverse, and dig the corner of the blade into the
ground to cut and dig up the roots.

When doing this, never hit the tree at high speed or apply
shock to fell the tree.

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OPERATION OPERATION

ADUSTING POSTURE OF WORK EQUIPMENT 3

ADJUST ANGLE OF BLADE EDGE 3

(Power tiltdozer only)

WARNING
It is dangerous if the work equipment moves by mistake when adjusting angle of the blade edge. Set the
work equipment in a stable condition, then stop the engine and lock the work equipment securely with the
work equipment lock lever.

Adjust the angle (θ) of the blade edge to match the type of soil.

The angle of the blade edge of the power angle, power tiltdozer cannot be adjusted.

POWER TILTDOZER

Turn the brace with bar handle (1) and the distance ( l )
between the joints to change the cutting angle (θ) as follows.

INCREASE distance ( l ) to INCREASE angle (θ)

DECREASE distance ( l ) to DECREASE angle (θ).

The standard for the cutting angle (θ) is 55°.

The standard distance between the joints ( l ) is as follows.

D61EX: 960 mm (37.8 in)

D61PX: 960 mm (37.8 in)

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OPERATION OPERATION

ADJUST AMOUNT OF TILT POWER TILT 3

WARNING
When adjusting the amount of tilt, it is dangerous if the work equipment is moved by mistake. Set the work
equipment in a safe condition, then stop the engine and lock the work equipment securely with the work
equipment lock lever.

POWER TILTDOZER

1. The following amount of tilt can be obtained by operating the blade control lever.

D61EX: 470 mm (18.5 in)

D61PX: 420 mm (16.5 in)

2. If it is required to tilt more than the condition obtained in

step 1 above, turn brace (1) with adjustment rod (2)
installed to it to change its length.

q Adjustment range of distance between joints ( l )

D61EX: 935 to 990 mm (36.8 to 39.0 in)

D61PX: 935 to 990 mm (36.8 to 39.0 in)

q Max. amount of tilt

D61EX: 690 mm (27.2 in)

D61PX: 600 mm (23.6 in)

NOTICE
If the brace is lengthened more than the maximum amount
of tilt, excessive forces are applied to various parts.
Accordingly, do not lengthen the brace more than the max-
imum amount of tilt.

REMARK
When adjusting the amount of tilt as explained in step 1 and 2
above, keep the blade above the ground.

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OPERATION OPERATION

PARKING MACHINE 3

WARNING
q When stopping the machine, select flat hard ground
and avoid dangerous places.
If it is unavoidably necessary to park the machine on a
slope, place the parking brake lever in the LOCK posi-
tion and insert blocks underneath the track shoes. As
an additional safety measure, thrust the blade into the
ground.

q If the work equipment control lever is touched by acci-

dent, the work equipment may move suddenly, and
this may lead to a serious accident. Before leaving the
operator's seat, always operate the work equipment
lock lever and parking brake lever to place it securely
at the LOCK position.

1. Stop the machine. For details, see “STOPPING MACHINE (3-100)“.

2. Set parking brake lever (1) to the LOCK position (L) and
apply the parking brake.

3. Move blade control lever (2) to the LOWER position (L),

and lower the blade to the ground.

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OPERATION OPERATION

4. Set work equipment lock leve (3) in the LOCK position (L).

CHECK AFTER FINISHING WORK 3

BEFORE STARTING ENGINE 3

Use the meters and caution lamps to check the engine coolant
temperature, engine oil pressure, fuel level, and Power train oil
temperature.

AFTER STARTING ENGINE 3

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 problem 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 any mud affixed to the undercarriage.

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OPERATION OPERATION

LOCKING 3
To prevent vandalism, there are locks at the following places.
Places that can be locked with the starting switch key.

q Top cover at front of chassis (1)

q Right and left engine side covers (2)

q Battery inspection cover (3)

q Inspection cover for fuel tank drain valve(4)

q Cab door opener (5) (machines equipped with cab)

q Fuel tank filler cap (6)

q Hydraulic tank filler cap (7)

q Power train filter inspection cover (8)

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OPERATION OPERATION

TIPS FOR LONGER UNDERCARRIAGE LIFE 3

Undercarriage life greatly varies depending on operation method, inspection and maintenance. For most efficient
operation, keep the following point in mind.

OPERATION METHOD 3
q Select the track shoe that best suits the type of soil to be encountered in service.

Please consult your Komatsu distributor when selecting track shoes.

q Do not allow shoe slipping to occur during operation.

If shoe slipping occurs, reduce load to the blade until slipping stops.

q Avoid sudden starts, acceleration or stops, unnecessary high speeds and sharp turns.

q Always operate machine in a straight line whenever possible. When making turns, be careful not to allow the
machine to stay to one side, so operation in both turning directions can be done properly. Make turns with the
largest possible radius.
q Prior to operation, clear boulders and obstacles to prevent machine from riding over them while operating.

q On a slope, operate the machine parallel to the inclination

of the slope. Do not operate across the slope. Also when
stopping the machine on a slope, the machine should face
toward the top of the slope.
q When ground inclines to the left or right during digging
operations, do not continue to dig with the incline. Move
the machine back to level ground and start to dig again.

q Do not force the machine to carry out work that exceeds its
working capability. Such work includes cases where the
idler or sprocket come off the ground when the machine
meets obstacles that resist the power of the machine dur-
ing dozing or ripping operations.

3-117
TRANSPORTATION OPERATION

TRANSPORTATION 3
When transporting the machine, observe all related laws and
regulations, and be careful to assure safety.

TRANSPORTATION MEANS 3
As a rule, transport the machine on a trailer.
Select a trailer according to the mass and dimensions of the machine shown in “SPECIFICATIONS (5-2)“.

Note that the mass and dimensions for transportation shown in SPECIFICATIONS depend on the types of shoe,
blade, etc.

REMOVING CAB 3
If it is necessary to remove the cab for transportation, there is danger that the seal may be damaged when remov-
ing or installing the cab, so please contact your Komatsu distributor.

When installing the cab, please contact your Komatsu distributor, too.

PRECAUTIONS WHEN REMOVING WORK EQUIPMENT 3

POWER ANGLE, POWER TILTDOZER 3

(For D61PX)

1. Lower the blade to the ground and set it horizontal to the

ground surface.

2. Remove the blade assembly.

REMARK
If the blade of D61EX is angled, its width is shorted to less than
3.0 m (9 ft 10 in). Accordingly, the blade of D61EX does not
need to be removed.

POWER TILTDOZER 3
If there is any pressure remaining in the tilt piping after the work equipment has been removed, it may be difficult to
remove the quick coupler of the tilt hose, so remove the work equipment as follows.

1. Lower the blade to the ground and set it horizontal to the

ground surface.

REMARK
If the blade is tiled, the tilt piping will be under internal pressure,
so set the blade horizontal to the ground.

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OPERATION TRANSPORTATION

2. Remove the quick coupler (1), then remove the work

equipment assembly.

3. Remove the left and right trunnions (2).

(For D61PX)

REMARK
In the case of D61PX, remove the left and right trunnions (2).
In the case of D61EX, the width including the left and right trun-
nions (2) is within 3.0 m (9 ft 10 in), so there is no need to
remove them.

4. Tie the tilt hose with a band to prevent it from being dam-
aged.

PRECAUTIONS WHEN REMOVING ROPS 3

When removing ROPS for transporting the machine, do as follows:

NOTICE
ROPS is an important safety component. Be sure to
tighten mounting bolts (1) securely to the specified torque
when installing.

Tightening torque: 785 to 980 N·m (80 to 100 kgf·m, 578.6

to 723.3 lbft)

1. Loosen bolts (1) and remove ROPS.

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TRANSPORTATION OPERATION

LOADING, UNLOADING WORK 3

WARNING
q Since loading and unloading of the machine is dangerous, be extremely careful.

q When loading or unloading the machine, operate it slowly with the engine speed low and the transmis-
sion in the 1st gear.

q Use ramps having sufficient width, length, thickness, and strength. Install them securely and set their
angle to 15° or less.
If the ramps are deflected appreciably, reinforce them with blocks.

q Perform the loading work of the machine on firm, level ground. Secure sufficient distance between the
shoulder of the road and the trailer.

q Remove mud from the undercarriage of the machine so that the machine will not slip sideways on the
ramps. In addition, remove water, snow, ice, grease, oil, etc. from the ramps.

q Never steer the machine on the ramps, since steering on the ramps can cause the machine to tip over.
If it is necessary to change the travel direction, return to the ground or to the bed of the trailer, then
change the travel direction.
q The center of gravity of the machine shifts suddenly at the border between the ramps and trailer, and
the machine is unbalanced and becomes dangerous. Accordingly, pass the border slowly.

When loading or unloading, always use ramps or a platform. Proceed as follows.

LOADING WORK

1. Load and unload on firm level ground only.

Maintain a safe distance from the edge of a road.

2. Apply the trailer brakes securely and put blocks (1) under
the tires to hold the trailer in position.Set gap (3) between
ramps (2) to match the distance between the left and right
tracks, and keep angle (4) to a maximum of 15°.

If ramps (2) bend appreciably under the weight of the

machine, put wooden block (5) under the ramps to support
them.

3. Start the engine.

In a cold weather, carry out an engine warming-up run, referring to the section, “STARTING IN COLD
WEATHER (3-95)“, in this manual.

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OPERATION TRANSPORTATION

4. Set parking brake lever to the FREE position (F).

5. Set the transmission in the 1st gear and run the engine at
low idle.

6. Set the travel direction toward the ramps and drive slowly.

7. The center of gravity of the machine shifts suddenly at the

border between the ramps and trailer, and the machine is
unbalanced and becomes dangerous. Accordingly, pass
the border slowly.
8. Stop the machine at the specified position on the trailer.

SECURING MACHINE

NOTICE
Always lower the car radio antenna to the stowing position and secure it in position (if the machine is
equipped with a cab).

Load the machine onto a trailer as follows:

1. Lower the work equipment slowly.

(When transporting with work equipment installed)

REMARK
If the edge of the blade extends outside the trailer, angle the
blade to reduce the width.

2. Set the work equipment lock leve to the LOCK position (L)
securely.

(When transporting with work equipment installed)

3. Set the parking brake lever to the LOCK position (L).

4. Stop the engine, then remove the key from the starting
switch.

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TRANSPORTATION OPERATION

5. Fix the machine as explained below so that it will not move

during transportation.
In particular, fix the machine securely to prevent it from
slipping sideways.

6. Put blocks (1) in front and behind the track shoes of both
sides.

7. Set up chain or wire, following (A) or (B).

q A: Secure chain or wire around the track shoes.

q B: Secure chain or wire through the holes of track links.

8. Protect the wire from contacting directly with angular parts

of the machine, by inserting pads.

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OPERATION TRANSPORTATION

UNLOADING WORK

1. Load and unload on firm level ground only. Maintain a safe distance from the edge of a road.

2. Apply the trailer brakes securely and put blocks (1) under
the tires to hold the trailer in position.Set gap (3) between
ramps (2) to match the distance between the left and right
tracks, and keep angle (4) to a maximum of 15°.

If ramps (2) bend appreciably under the weight of the

machine, put wooden block (5) under the ramps to support
them.
3. Remove the chains and wire ropes fastening the machine.

4. Start the engine.

In a cold weather, carry out an engine warming-up run, referring to the section, “STARTING IN COLD
WEATHER (3-95)“, in this manual.

5. Set main work equipment lock lever to FREE position (F),

and raise the work equipment.
(When transporting with work equipment installed)

6. Set parking brake lever to the FREE position (F).

7. Set the transmission in the 1st gear and run the engine at
low idle.
8. Set the travel direction toward the ramps and drive slowly.

9. The center of gravity of the machine shifts suddenly at the

border between the ramps and trailer, and the machine is
unbalanced and becomes dangerous. Accordingly, pass
the border slowly.

10. Drive down the ramps slowly and carefully until the
machine leaves the ramps perfectly.

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TRANSPORTATION OPERATION

LIFTING MACHINE 3

WARNING
q Do not lift the machine with any worker on it.

q Use wire ropes having sufficient strength for the weight of the machine.

q Lift the machine only in the position shown below. If it is lifted in another position, it may be unbal-
anced.

q Lift the machine level.

NOTICE
The lifting procedure applies to machines with standard specifications.
The method of lifting differs according to attachments and options actually installed on the machine. For
the proper lifting procedures, contact your Komatsu distributor.

For details of the weight, see “SPECIFICATIONS (5-2)“.

PROCEDURE FOR LIFTING OPERATIONS

When lifting the machine, stop it on a level place, then observe the following procedure.

1. Stop the engine and set the parking brake lever to the
LOCK position (L).

2. Install wire ropes, slings, etc. matched to the weight of the machine to the lifting points as.

NOTICE
q Use protectors, etc. so that the wire ropes will not be broken at sharp edges or narrow places.

q Use spreaders and bars having sufficient width so that they will not touch the machine.

3. After setting the wire ropes, lift up the machine and stop at 100 to 200 mm (3.9 to 7.9 in) above the ground,
and check that the wire ropes are not slack and the machine is level, then lift up slowly.

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OPERATION TRANSPORTATION

LIFTING POSITION

(For D61EX)

q Fit the wire rope at the front to the track shoe within range (A) between the center of the front idler and the rear
edge.

q Fit the wire ropes at the front to both the left and right track shoes.

q Fit protector (1) at the edge to protect the wire rope.

q Fit the wire ropes at the rear to both left and the right pivot shafts (2).

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TRANSPORTATION OPERATION

For machine equipped with ripper

q Raise ripper (3) to the maximum height and retract the ripper cylinder fully.

q Fit the wire rope at the front to the track shoe within range (A) between the center of the front idler and the rear
edge.

q Fit the wire ropes at the front to both the left and right track shoes.

q Fit protector (1) at the edge to protect the wire rope.

q Fit the wire ropes at the center to both left and the right pivot shafts (2).

q Fit the wire rope at the rear to ripper beam (4).

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OPERATION TRANSPORTATION

(For D61PX)

q Raise blade (5) height (B) 30 - 40 cm (1.2 - 1.6 in) from the ground.

q Pass the wire rope at the front within the range (A) between the center of the front idler and the rear edge,
pass it under the undercover, and bring it out to the opposite side.

q Fit protector (1) at the edge to protect the wire rope.

q Fit the wire ropes at the rear to both left and the right pivot shafts (2).

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COLD WEATHER OPERATION OPERATION

COLD WEATHER OPERATION 3

PRECAUTIONS FOR LOW TEMPERATURE 3

If the temperature becomes low, it becomes difficult to start the engine, and the coolant may freeze, so do as fol-
lows.

FUEL AND LUBRICANTS

Change the fuel and oil for each component to those of lower viscosity. For the specific viscosity, see “USE OF
FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE (4-10)“.

COOLANT

WARNING
q Antifreeze 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 amounts of fresh water and see a doctor at once.

q When changing the coolant or when handling coolant containing antifreeze that has been drained
when repairing the radiator, please contact your Komatsu distributor. Antifreeze is toxic. Do not let it
flow into drainage ditches or spray it on to the ground surface.

q Antifreeze is flammable. Do not bring any flame close. Do not smoke when handling antifreeze.

NOTICE
q Never use methanol, ethanol, or propanol-based antifreeze.

q Never use any water-leakage prevention agent or any antifreeze containing such an agent.

q Do not mix different types of antifreeze.

For details on the amount of antifreeze mixture and on when to change the coolant, see “CLEAN INSIDE OF
COOLING SYSTEM (4-23)“.

Use a Permanent Antifreeze (ethylene glycol mixed with corrosion inhibitor, antifoam agent, etc.) meeting the stan-
dard requirements as shown below. With permanent antifreeze, no change of coolant is required for a year. If it is
doubtful that an available antifreeze meets the standard requirements, ask the supplier of that antifreeze for infor-
mation.

Standard requirements for permanent antifreeze

q SAE J1034

q FEDERAL STANDARD O-A-548D

REMARK
In areas where permanent antifreeze is not available, it is possible to use antifreeze whose main component is
ethylene glycol and does not contain any corrosion inhibitor. (Such antifreeze can be used for the winter season
only.) However, in such a case, the coolant must be changed twice a year (spring and autumn), so use permanent
antifreeze when possible.

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OPERATION COLD WEATHER OPERATION

BATTERY

WARNING
q The battery generates flammable gas. Do not bring fire or sparks near the battery.

q Battery electrolyte is dangerous. If it gets in your eyes or on your skin, wash it off with a large amount
of water and consult a doctor.

q Battery electrolyte dissolves paint. If it gets on the bodywork, wash it off immediately with water.

q If the battery electrolyte is frozen, do not charge the battery or start the engine with a different power
source. There is danger that the battery may explode.

q Battery electrolyte is toxic. Do not let it flow into drainage ditches or spray it on to the ground surface.

When the ambient temperature drops, the capacity of the battery will also drop. If the battery charge ratio is low,
the battery electrolyte may freeze. Maintain the battery charge as close as possible to 100%. Insulate it against
cold temperature to ensure the machine can be started easily the next morning.

REMARK
Measure the specific gravity and calculate the rate of charge from the following conversion table.

Temperature(°C)
20 0 -10 -20
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

q As the battery capacity drastically drops in low temperatures, cover or remove the battery from the machine,
store the battery in a warm place, and install it again the next morning.
q If the electrolyte level is low, add distilled water in the morning before beginning work. Do not add water after
the day's work to prevent diluted electrolyte in the battery from freezing during the night.

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COLD WEATHER OPERATION OPERATION

AFTER COMPLETION OF WORK 3

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.

q Remove all the mud and water from the machine body. In particular, wipe the hydraulic cylinder rod clean to
prevent damage to the seal caused by mud or dirt on the rod surface getting inside the seal together with
drops of water.
q Park the machine on hard, dry ground.

If this is impossible, park the machine on wooden boards.

The boards help protect the tracks from being frozen in the soil and allow the machine can be moved the next
morning.

q Open the drain valve and drain any water collected in the fuel system to prevent it from freezing.

q Fill the fuel tank to capacity. This minimizes moisture condensation in the tank when the temperature drops.

AFTER COLD WEATHER 3

When the season changes and the weather becomes warmer, do as follows.

q Replace all fuel and oil with the specified fuel and oil.

For details, see “USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERA-
TURE (4-10)“.

q If for any reason permanent antifreeze cannot be used, and an ethylene glycol base antifreeze (winter, one
season type) is used instead, or if no antifreeze is used, drain the cooling system completely. Thoroughly flush
out the cooling system and fill it with fresh coolant.

3-130
OPERATION LONG-TERM STORAGE

LONG-TERM STORAGE 3

BEFORE STORAGE 3
When keeping in long-term storage (more than one month), store as follows.

q Clean and wash all parts, then store the machine indoors. If the machine has to be stored outdoors, select
level ground and cover the machine with a sheet.

q Fill the fuel tank to prevent moisture from accumulating.

q Completely fill the fuel tank, lubricate and change the oil before storage.

q Apply a thin coat of grease to metal surface of the hydraulic piston rods and the idler adjusting rods.

q Disconnect the negative terminals of the battery and cover it or remove it from the machine and store it sepa-
rately.

q Place all control levers in the neutral position, set the work equipment lock lever and parking brake lever in the
LOCK position, and set the fuel control lever to the low idle position.

DURING STORAGE 3

WARNING
When it is necessary to perform the rust-preventive operation while the machine is indoors, open the
doors and windows to improve ventilation and prevent gas poisoning.

q During storage, operate and move the machine for a short distance once a month so a new film of oil will coat
movable parts and component surfaces. At the same time, also charge the battery.

q When operating the work equipment, wipe off all the grease from hydraulic cylinder rods.

q If the machine is equipped with an air conditioner, operate it for 3 to 5 minutes once a month to lubricate each
portion of its compressor. Be sure to idle the engine at low speed for this purpose. Also, check the quantity of
refrigerant twice a year.

AFTER STORAGE 3
NOTICE
If the machine has been stored without the monthly rust prevention operation, consult your Komatsu dis-
tributor for service.

When using the machine after long-term storage, do as follows before using it.

q Wipe off the grease from the hydraulic cylinder rods.

q Add oil and grease at all lubrication points.

q When the machine is stored for a long period, moisture in the air can contaminate the oil over time. Check the
oil for presence of water before and after starting the engine. If there is water in the oil, change the oil.

3-131
TROUBLESHOOTING OPERATION

TROUBLESHOOTING 3

AFTER RUNNING OUT OF FUEL 3

When restarting the machine after running out of fuel, fill with fuel and bleed the air from the fuel system before
starting.

For details of bleeding the air, see “REPLACE FUEL FILTER CARTRIDGE (4-55)“.

MACHINE TOWING METHOD 3

WARNING
q If the engine does not start, put blocks under the tracks to prevent the machine from moving, then
release the brake. If blocks are not put under the tracks, the machine may suddenly move.

q Be sure to use a wire rope sufficiently strong for the towing weight.

q When using the towing hook, be sure to use a shackle.

q Set the wire rope horizontally and align it with the track frame.

q Tow the machine slowly.

q When returning a towed machine to the jobsite, first check that the necessary repairs and adjustments
have been made.

For details of the method of towing, please contact your Komatsu distributor.

q With this machine, if the engine stops or there is an problem in the hydraulic system and the oil pressure in the
brake circuit drops, the brake is actuated and it becomes impossible to move the machine. To move the
machine, it is necessary to use a special device to set the oil pressure in the brake circuit to above the speci-
fied pressure, so see the section “WHEN ENGINE DOES NOT START (3-134)“ to release the brake, or con-
tact your Komatsu distributor.

q Moving a machine by towing is only used to move it to a place where it is possible to carry out inspection and
maintenance. It is not intended for moving the machine long distances. Do not use this method for towing the
machine for long distances.
q Before towing, check that the tow rope or bar are in good condition, and that they have ample strength for the
towing operation. If the machine being towed may get stuck in mud or may have to be towed uphill, the tow
rope or bar must be of a strength of at least 1.5 times greater than the weight of the machine being towed.

q If it is impossible to operate the steering and brakes of the machine being towed, do not let anyone ride on the
machine.

q To protect the operator if the towing rope or bar should break, fit a shield to the machine being towed.

q When towing a machine, travel slowly. If the machine is suddenly pulled, the towing rope may break. Before
starting to move the towed machine, remove any slack in the rope, and keep the rope taut during the towing
operation.

q Keep the angle of the towing line to the minimum. Operate the machine so that the angle does not become
greater than 30° from the straight line.

3-132
OPERATION TROUBLESHOOTING

If the machine gets stuck in the mud or a heavy thing needs to

be towed, install a towing wire rope to the draw bar pin.

WHEN IT IS POSSIBLE TO START ENGINE 3

CAUTION
The operator of the machine being towed should always operate the steering so that the machine faces in
the direction of the towing line.

NOTICE
The maximum towing capacity for this machine is 14,275 kg (140,000 N). Always carry out towing opera-
tions within the maximum towing capacity.

If the steering or brake system are actuated and the engine is running, it is possible to pull the machine out of mud,
move it to the side of the road, or tow it for short distances.

Always read the section “MACHINE TOWING METHOD (3-132)“ and carry out the operation extremely carefully.

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TROUBLESHOOTING OPERATION

WHEN ENGINE DOES NOT START 3

WARNING
q If action has been taken to release the brakes, the brakes cannot be used, so never let anyone travel
on the machine when it is being towed.

q When towing a machine downhill, connect another machine behind the machine being towed and use
the brakes on this machine to control the braking.

q When carrying out the towing operation, do not let any person enter the area around the machine
being towed.

If the engine does not work and the machine is to be moved, it is necessary to carry out preparatory work to install
a pump to release the brakes.
For details of the equipment needed to tow a machine when the engine does not work, please contact your
Komatsu distributor.

To release the brakes, install a brake release pump on the machine to be towed and connect the hose at the pres-
sure side of the pump to the brake. Use the pressure of the pump to apply pressure to the brake and release the
brake. For details, see the next page. Follow the procedure and carry out the operation correctly.

CONNECTING BRAKE RELEASE PUMP

It is possible to use a service hydraulic pump to release the brakes on the problem machine and tow it.

q Part number of hydraulic pump: 790-190-2000

Main specifications of hydraulic pump

Discharge amount: 6.8 liters/minute 3.9MPa(40kg/cm2)

Discharge pressure: 13.7MPa(140kg/cm2)

Tank capacity: 20 liters (5.28 US gal)

Rated horsepower: DC24V 750W

Oil used: SAE10W

Weight: 9.5 kg (20.95 lb)

Hose length: 1.5 m (59.1 in)

3-134
OPERATION TROUBLESHOOTING

PUMP TEST

CAUTION
If the operation is carried out without inspecting the hydraulic pump, it may lead to damage of the brake
system seal. Always inspect the hydraulic pump before connecting it.

1. Install tee (1) to the discharge portion of the pump, then

install oil pressure gauge (2) and accumlator (3), rubber
hose (4).

Install quick coupler (5) to the end of rubber hose (6) that is
mounted to the machine.

2. Pump handle (6) and check that the pressure gauge

becomes 2.7 to 3.1 MPa (28 to 32 kg/cm2, 298 to 454
PSI).

3-135
TROUBLESHOOTING OPERATION

CONNECTING PUMP TO MACHINE

WARNING
q Fit blocks under the tracks to prevent the machine from moving, then release the brake.

q Immediately after the engine is stopped, all parts are at high temperature, so do not carry out the oper-
ation to install the brake release pump immediately. Wait for the temperature to go down until it is pos-
sible to touch the steering case by hand.

1. Fit blocks securely under the tracks to prevent the machine from moving.

2. Remove cover (1) of the central pressure detection port in

the right fender.

3. Remove plug (2) from the brake pressure detection port.

4. After removing the plug, install adapter (3).

Install an adapter that fits the mouthpiece of the brake

release pump.

5. Connect the hose of the brake release pump to adapter (3)

in the brake pressure detection port.

3-136
OPERATION TROUBLESHOOTING

RELEASING BRAKE

CAUTION
When a machine is towed, the brakes must be fully released. If the brakes are partially applied, this may
lead to overheating and damage to the brakes.
To release the brakes, set the pump pressure to 2.7 to 3.1 MPa (28 to 32 kg/cm2, 398 to 454 PSI).
If the pump pressure exceeds 3.1 MPa (32 kg/cm2, 454 PSI), the components of the brake may be dam-
aged.
When towing, leakage from the oil pressure circuit will cause the pump pressure to go down with time.
Always keep the pump pressure above 1.8 MPa (18 kg/cm2, 213 PSI) when towing. If the pressure goes
below 1.8 MPa (18 kg/cm2, 213 PSI) during the towing
operation, stop the operation, pump the handle of the brake release pump, and raise the pump pressure to
2.7 to 3.1 MPa (28 to 32 kg/cm2, 398 to 454 PSI).
When towing, do not use the brakes to control the travel speed of the machine. This will further damage
the brakes and there may be defective operation of the brake system.

1. Operate handle (1) of the brake release pump and send

pressure oil to the brake circuit until it reaches the specified
pressure.

Specified pump pressure: 2.75 to 3.14 MPa (28.0 to 32.0

kg/cm2, 398 to 454 PSI)

REMARK
If it is necessary to move the brake release pump during the
operation, hold lever (2) under handle (1) and move the pump.

2. It is now possible to tow the machine.

Remove the blocks, and tow the machine at a speed of

less than 2 km/h (1.2 MPH).

OPERATING BRAKE

After completion of the towing operation, apply the brake to prevent the machine from moving.

To apply the brake, turn relief handle (1) of the brake release
pump to release the pressure.

3-137
TROUBLESHOOTING OPERATION

IF BATTERY IS DISCHARGED 3

WARNING
q It is dangerous to charge a battery when mounted on a
machine. Make sure that it is dismounted before
charging.

q When checking or handling the battery, stop the

engine and turn the starting switch key to the OFF
position.

q The battery generates hydrogen gas, so there is a haz-

ard of explosion. Do not bring lighted cigarettes near
the battery, or do anything that will cause sparks.

q Battery electrolyte is dilute sulfuric acid, and it will

attack your clothes and skin. If it gets on your clothes
or on your skin, immediately wash it off with a large
amount of water. If it gets in your eyes, wash it out with
fresh water and consult a doctor.

q When handling batteries, always wear protective gog-

gles and rubber gloves.

q When removing the battery, first disconnect the cable

from the ground (normally the negative (-) terminal).
When installing, install the positive (+) terminal first.
If a tool touches the positive terminal and the chassis,
there is danger that it will cause a spark, so be
extremely careful.

q If the terminals are loose, there is danger that the

defective contact may generate sparks that will cause
an explosion.
q When removing or installing the terminals, check
which is the positive (+) terminal and which is the neg-
ative (-) terminal.

REMOVE AND INSTALL BATTERY 3

1. Open the battery cover.

2. Before removing battery, remove the ground cable (normally connected to the negetive (-) terminal). If any tool
touches between the positive terminal and the chassis, there is danger of sparks being generated. Loosen the
nuts of the terminal and remove the wires from the battery.

3. After installing the battery, fix it with the battery hold down.
Tightening torque: 1.47 to 1.96 N·m (0.15 to 0.2 kgf·m, 1.1 to 1.4 lbft)

4. When installing the battery, connect the ground cable last.

Insert the hole of the terminal on the battery and tighten the nut.

Tightening torque: 5.9 to 9.8 N·m

(0.6 to 1.0 kgf·m, 4.3 to 7.2 lbft)

3-138
OPERATION TROUBLESHOOTING

PRECAUTIONS FOR BATTERY CHARGING 3

If the battery is charged improperly, it may explode. Accord-

ingly, charge it according to “IF BATTERY IS DISCHARGED
(3-138)“ and the instruction manual attached to the charger,
and observe the following items.

q 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 explosion.

q Connect the positive (+) charger clip of the charger to the

positive (+) terminal of the battery, then connect the nega-
tive (-) charger clip of the charger to the negative (-) termi-
nal of the battery. Be sure to fix the clips securely.

q Set the charging current to 1/10 of the value of the rated battery capacity; when carrying out rapid charging,
set it to less than the rated battery capacity.
If the charger current is too high, the electrolyte will leak or dry up, and this may cause the battery to catch fire
and explode.

q If the battery electrolyte is frozen, do not charge the battery or start the engine with a different power source.
There is a danger that this will ignite the battery electrolyte and cause the battery to explode.

q Do not use or charge the battery if the battery electrolyte level is below the LOWER LEVEL line. This may
cause an explosion. Check the battery electrolyte level periodically and add distilled water to bring the electro-
lyte level to the UPPER LEVEL line.

STARTING ENGINE WITH BOOSTER CABLE 3

When starting the engine with a booster cable, do as follows:

PRECAUTIONS WHEN CONNECTING AND DISCONNECTING BOOSTER CABLE

WARNING
q When connecting the cables, never contact the posi-
tive (+) and negative (-) terminals.

q When starting the engine with a booster cable, wear

safety glasses and rubber gloves.
q Be careful not to let the normal machine and problem
machine contact each other. This prevents sparks from
generating near the battery which could ignite the
hydrogen gas given off by the battery.

q Make sure that there is no mistake in the booster cable

connections. The final connection is to the engine
block of the problem machine, but sparks will be gen-
erated when this is done, so connect to a place as far
as possible from the battery.

q When disconnecting the booster cable, take care not

to bring the clips in contact with each other or with the
machine body.

3-139
TROUBLESHOOTING OPERATION

NOTICE
q The starting system for this machine uses 24V. For the normal machine, also use a 24V battery.

q The size of the booster cable and clip should be suitable for the battry size.

q The battery of the normal machine must be the same capacity as that of the engine to be started.

q Check the cables and clips for damage or corrosion.

q Make sure that the cables and clips are firmly connected.

q Check that the work equipment lock levers and parking brake levers of both machine are in the LOCK
position.

q Check that each lever is in the NEUTRAL position.

CONNECTING THE BOOSTER CABLE

Keep the starting switch of the normal machine and problem machine in the OFF position.
Connect the booster cable as follows, in the order of the numbers marked in the diagram.

1. Connect the clip of booster cable (A) to the positive (+) ter-
minal of battery (C) on the problem machine.
2. Connect the clip at the other end of booster cable (A) to the
positive (+) terminal of battery (D) on the normal machine.

3. Connect the clip of booster cable (B) to the negative (-) ter-
minal of battery (D) on the normal machine.

4. Connect the clip at the other end of booster cable (B) to

engine block (E) on the problem machine.

STARTING ENGINE

WARNING
Always check that the work equipment lock lever is set to the LOCK position, regardless of whether the
machine is working normally or has failed. Check also that all the control levers are in the HOLD or NEU-
TRAL position.

1. Make sure the clips are firmly connected to the battery terminals.

2. Start engine of the normal machine and run it at high idling speed.
3. Turn the starting switch of the problem machine to the START position and start the engine.

If the engine doesn't start at first, try again after 2 minutes or so.

3-140
OPERATION TROUBLESHOOTING

DISCONNECTING THE BOOSTER CABLE

After the engine has started, disconnect booster cables in the reverse order in which they were connected.

1. Remove the clip of booster cable (B) from engine block (E)
on the problem machine.

2. Remove the clip of booster cable (B) from the negative (-)
terminal of battery (D) on the normal machine.

3. Remove the clip of booster cable (A) from the positive (+)
terminal of battery (D) on the normal machine.

4. Remove the clip of booster cable (A) from the positive (+)
terminal of battery (C) on the problem machine.

3-141
TROUBLESHOOTING OPERATION

OTHER TROUBLE 3

ELECTRICAL SYSTEM 3
q ( ): Always contact your Komatsu distributor when dealing with these items.

q In cases of problem or causes which are not listed below, contact your Komatsu distributor for repairs.

Problem Main cause Remedy

Lamp does not glow brightly even •Defective wiring (•Check, repair loose terminals, dis-
when the engine runs at high speed connections
Check fuses and diodes in fuse
box)
Lamp flickers while engine is run- •Defective adjustment of fan belt •Adjust fan belt tension
ning tension For details, see EVERY 250
HOURS SERVICE
Battery charge circut caution lamp •Defective°belt •Replace
dose not go out even when engine is •Defective alternator (•Replace)
running •Defective wiring (•Check, repair
Check fuse, diode in fuse box)
Abnormal noise is generated from •Defective alternator (•Replace)
alternator
Starting motor does not turn when •Defective wiring (•Check, repair)
starting switch is turned to ON •Insufficient battery charge •Charge
Pinion of starting motor keeps going •Insufficient battery charge •Charge
in and out
Starting motor turns engine slug- •Insufficient battery charge •Charge
gishly •Defective starting motor (•Replace)
Starting motor disengages before •Defective wiring (•Check, repair)
engine starts •Insufficient battery charge •Charge
Engine preheating pilot lamp does •Defective wiring (•Check, repair)
not light up •Defective timer (•Replace)
(When the temperature of the •Defective monitor (•Replace)
engine coolant exceed 20°C (68°F), •Disconnection in glow plug (•Replace)
this condition is normal)
•Blown fuse (•Check, repair)
Air conditioner operation is defective
•Insufficient battery charge •Charge
•Defective air conditioner switch (•Replace air conditioner switch)
•Defective blower switch (•Replace blower switch)
•Defective compressor (•Replace)

3-142
OPERATION TROUBLESHOOTING

MONITOR PANEL 3

When an error code appears on the display panel B (multi-

information), take appropriate remedies based upon the table
below.

(1): Display panel B

(2): Warning lamp (red)

REMARK
If different kinds of failures occur at the same time, their failure
codes are arranged in the order of seriousness in the display.
The order of seriousness in this case is E04, E03, E02 and
E01, starting from the most serious one.

Action Warning Alarm

Display panel B Remedy
code lamp buzzer
Failure in part of function, stops. When con-
Top line: Displays E01 tinuing operations, be extremely careful of
E01 - -
Bottom line: Displays service meter location of failure. After completing opera-
tions, contact Komatsu distributor for repairs
Serious failure in part of function, stops.
When continuing operations, be extremely
Top line: Displays E02
E02 Flashes Sounds careful of location of failure. After completing
Bottom line: Displays service meter
operations, contact Komatsu distributor for
repairs
Top line: Displays E03
Bottom line: After moving to safe place, stop machine
E03 Displays telephone number Flashes Sounds immediately. Contact Komatsu distributor for
(If no telephone number is set, dis- repairs
plays 0)
Top line: Displays E04
Bottom line: Displays telephone
Stop machine immediately.
E04 number Flashes Sounds
Contact Komatsu distributor for repairs
(If no telephone number is set, dis-
plays 0)

Note: If an abnormality display appears on display panel B, check the fault code. For details, see “METHOD OF
USING FAULT CODE DISPLAY MODE (3-29)“.

When contacting your Komatsu distributor, please give the fault code also.

3-143
TROUBLESHOOTING OPERATION

CHASSIS 3
q ( ): Always contact your Komatsu distributor when dealing with these items.

q In cases of problem or causes which are not listed below, contact your Komatsu distributor for repairs.

Problem Main causes Remedy

•Improper tightening of oil pipe, pipe •Check, repair
joint, air leaking in or oil leaking out
because of damage
•Wear, scuffing of gear pump (•Check, replace)
Oil pressure in torque converter fails
•Insufficient oil in power train case •Add oil to the specified level. For
to rise
details, see CHECK BEFORE
STARTING
•Clogged oil filter element strainer in •Clean. For details, see EVERY 500
power train case HOURS SERVICE
•Clean radiator core
•Clogged radiator
•See ENGINE related parts
•Engine coolant temperature is high
•Clogged oil cooler
(•Clean or repalce)
Torque converter is overheated •Oil pressure too low
•Go to “Oil pressure in torque con-
verter fails to rise“
•Lack of flow of lubricant caused by
(•Replace gear pump)
wear of power train gear pump
Torque converter oil temperature •Defective oil temperature gauge (•Replace oil temperature gauge)
gauge does not work •Defective contact in wiring connec- (•Check, repair)
tion
•Lack of engine horsepower •See ENGINE related parts
Lacks drawbar pull (machine does
•Oil pressure in torque converter is •Go to “ Oil pressure in torque con-
not pick up speed)
too low verter fails to rise“
•Insufficient oil in power train case •Add oil to specified level. For
details, see CHECK BEFORE
•Transmission oil pressure does not STARTING
Machine will not move when steer-
rise •Go to oil pressure in torque con-
ing, forward-reverse, gear shift lever
•Defective Brake verter fails to rise
is placed in FORWARD
•Defective lever wiring (•Adjust linkage)
•Parking brake lever is in LOCK (•Check, repair)
position •Set to FREE position
•Defective lever wiring (•Check, repair)
Does not steer even when steering
•Abnormal HSS pump (•Check, replace)
is operated
•Abnormal HSS motor (•Check, replace)
Machine doesn't stop when brake •Defective brake adjustment (•Adjust linkage)
pedal are depressed (•Check brake pressure)
•Track is too loose •Adjust track tension. For details,
Track comes off
see WHEN REQUIRED
•Track is too loose or too tight •Adjust track tension. For details,
Sprocket develops abnormal wear
see WHEN REQUIRED
•Defective adjustment of HSS con- (•Adjust)
Machine does not travel in straight
troller
line
•Abnormal HSS pump (•Replace)
•Lack of hydraulic oil •Add oil to specified level. For
Blade rises too slowly or does not details, see EVERY 250 HOURS
rise at all •Defective hydraulic pump SERVICE
(or blade tilts too slowly) •Work equipment lock lever is in •Check
LOCK position •Set to FREE position

3-144
OPERATION TROUBLESHOOTING

ENGINE 3
q ( ): Always contact your Komatsu distributor when dealing with these items.

q In cases of problem or causes which are not listed below, contact your Komatsu distributor for repairs.

Problem Main causes Remedy

•Add oil to specified level, see
•Engine oil pan oil level is low (suck-
CHECK BEFORE STARTING
ing in air)
•Replace cartridge, see EVERY
Engine oil pressure caution lamp •Clogged oil filter cartridge
500 HOURS SERVICE
flashes when engine speed is raised
(•Check, repair)
after completion of warm-up •Defective tightening of oil pipe joint,
oil leakage from damaged part
•Defective monitor panel
(•Replace)
Steam is emitted from top part of •Add coolant, repair, see
•Coolant level low, water leakage
radiator (pressure valve) CHECK BEFORE STARTING
•Dirt or scale accumulated in cooling
•Change coolant, clean
system
inside of cooling system, see
WHEN REQUIRED
•Clogged radiator fins or damaged
•Clean or repair, see WHEN
Engine coolant temperature caution fins
REQUIRED
lamp flashes •Defective thermostat
(•Replace thermostat)
•Loose radiator filler cap (high alti-
•Tighten cap or replace packing
tude operation)
•Defective monitor panel
(•Replace)
•Lack of fuel •Add fuel, see CHECK BEFORE
STARTING
•Air in fuel system •Repair place where air is sucked
Engine does not start when starting in
motor is turned •No fuel in fuel filter (•Replace pump or nozzle)
•Starting motor cranks engine slug- •See ELECTRICAL SYSTEM
gishly
•Defective valve compression (•Adjust valve clearance)
•Too much oil in oil pan •Add oil to specified level, see
Exhaust gas is white or blue CHECK BEFORE STARTING
•Improper fuel •Change to specified fuel
•Clogged air cleaner element •Clean or replace, see WHEN
REQUIRED
Exhaust gas occasionally turns
•Defective nozzle (•Replace nozzle)
black
•Defective compression (•Adjust valve clearance)
•Defective turbocharger (•Clean or replace, turbocharger)
Combustion noise occasionally •Defective nozzle (•Replace nozzle)
makes breathing sound •Lack of fuel (in Air) •Add fuel
•Low grade fuel being used •Change to specified fuel
•Overheating •See item “Indicator of water
Abnormal noise generated (combus- temperature gauge is in red
tion or mechanical) range on right side of gauge“.
•Damage inside muffler (•Replace muffler)
•Excessive valve clearance (•Adjust valve clearance)

3-145
TROUBLESHOOTING OPERATION

3-146
MAINTENANCE

14
GUIDE TO MAINTENANCE MAINTENANCE

GUIDE TO MAINTENANCE 4
Do not perform any inspection and maintenance operation that is not found in this manual.

CHECK SERVICE METER:

Check the service meter reading every day to see if the time has come for any necessary maintenance to be per-
formed.

KOMATSU GENUINE REPLACEMENT PARTS:

Use Komatsu genuine parts specified in the Parts Book as replacement parts.

KOMATSU GENUINE OILS:

Use Komatsu genuine oils and grease. Choose oils and grease with proper viscosities specified for ambient tem-
perature.

ALWAYS USE CLEAN WASHER FLUID:

Use automobile window washer fluid, and be careful not to let any dirt get into it.

CLEAN OIL AND GREASE:

Use clean oil and grease. Also, keep the containers of the oil and grease clean. Keep foreign materials away from
oil and grease.

CHECKING FOREIGN MATERIALS IN DRAINED OIL:

After oil is changed or filters are replaced, 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 carry out
suitable action.

FUEL STRAINER:

Do not remove the strainer from the filler port when adding fuel.

WELDING INSTRUCTIONS:
q Turn off the engine starting switch.

q Do not apply more than 200 V continuously.

q Connect grounding cable within 1 m (3.3 ft) of the area to be welded. If grounding cable is connected near
instruments, connectors, etc., the instruments may malfunction.
q If a seal or bearing happens to come between the part being welded and grounding point, change the ground-
ing point to avoid such parts.

q Do not use the area around the work equipment pins or the hydraulic cylinders as the grounding point.

DO NOT DROP THINGS INSIDE MACHINE:

q When opening inspection windows or the oil filler port of the tank to carry out 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 you drop anything inside the machine, always remove it immediately.
q Do not put unnecessary things in your pockets. Carry only things which are necessary for inspection.

4-2
MAINTENANCE GUIDE TO MAINTENANCE

DUSTY WORKSITES:

When working at dusty worksites, do as follows:

q Inspect the dust indicator frequently to see if the air cleaner is dirty or clogged.

q Clean the radiator core frequently to avoid clogging.

q Clean and replace the fuel filter frequently.

q Clean electrical components, especially the starting motor and alternator, to avoid accumulation of dust.

q When inspecting or changing the oil, move the machine to a place that is free of dust to prevent dirt from get-
ting into the oil.

AVOID MIXING OILS:

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. Never mix different brand or grade of oil.

PRECAUTIONS FOR OPENING AND CLOSING ENGINE SIDE COVER:

q Open the engine side cover all the way and ensure that it is
locked open before letting go.

q When standing on the track to open the engine side cover,

bend at the knees and open the cover in a standing posi-
tion to avoid back strain.

q Before opening the cab door, always close the engine side
cover.

If the lock for the engine side cover is not released, it will
not close. If any attempt is made to close it without releas-
ing the lock, the gas damper may break.
When closing the cover, push the orange button in the cen-
ter of the gas damper (1) to release the lock, then close the
cover.

LOCKING THE INSPECTION COVER:

Lock inspection cover securely into position with the lock bar. If inspection or maintenance is performed with
inspection cover not locked in position, there is a danger that it may be suddenly blown shut by the wind and cause
injury to the worker.

HYDRAULIC SYSTEM-AIR BLEEDING:

After repairing or replacing hydraulic equipment or after removing the hydraulic piping, it is necessary to bleed the
air from the circuit. For details, see “PROCEDURE FOR BLEEDING AIR IN HYDRAULIC SYSTEM (4-42)“.

4-3
GUIDE TO MAINTENANCE MAINTENANCE

PRECAUTIONS WHEN INSTALLING HYDRAULIC HOSES:

q When removing parts at locations where there are O-rings or gasket seals, clean the mounting surface, and
replace with new parts.

When doing this, be careful not to forget to assemble the O-rings and gaskets.

q When installing the hoses, do not twist or bend them into loops with a small radius.

This will cause damage to the hose and drastically reduce its service life.

CHECKS AFTER INSPECTION AND MAINTENANCE WORK:

If you forget to perform the checks after inspection and maintenance, unexpected problems may occur, and this
may lead to serious injury or property damage. Always do the following:

q Checks after operation (with engine stopped)

q Have any inspection and maintenance points been forgotten?

q Have all inspection and maintenance items been performed correctly?

q 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.

q Is there any leakage of coolant or oil? Have all nuts and bolts been tightened?

q Checks when engine is running

q For the checks when the engine is running, see “TWO WORKERS FOR MAINTENANCE WHEN ENGINE
IS RUNNING (2-28)“ in the SAFETY section, and take care of safety sufficiently.

q Check that the inspected and maintained parts work normally.

q Raise the engine speed and check for fuel leakage and oil leakage.

4-4
MAINTENANCE OUTLINE OF SERVICE

OUTLINE OF SERVICE 4

OUTLINE OF OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC 4

OIL 4
q 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
the Operation and Maintenance Manual. Even if the oil is not dirty, always change the oil after the specified
interval.
q Oil corresponds to blood in the human body, so always be careful when handling it to prevent any impurities
(water, metal particles, dirt, etc.) from getting in.

The majority of problems with machines are caused by the entry of such impurities.

Take particular care not to let any impurities get in when storing or adding oil.

q Never mix oils of different grades or brands.

q Always add the specified amount of oil.

Having too much oil or too little oil are both causes of problems.

q If the oil in the work equipment is not clear, there is probably water or air getting into the circuit. In such cases,
please contact your Komatsu distributor.

q When changing the oil, always replace the related filters at the same time.

q We recommend you have an analysis made of the oil periodically to check the condition of the machine. For
those who wish to use this service, please contact your Komatsu distributor.

FUEL 4
q After completing the day's operations, fill the fuel tank to force out any air containing moisture. This will pre-
vent the moisture from condensing and mixing with the fuel.

q The fuel pump is a precision instrument, and if fuel containing water or dirt is used, it cannot work properly.
q Be extremely careful not to let impurities get in when storing or adding fuel.

q Always use the fuel specified in the Operation and Maintenance Manual.

Fuel may congeal depending on the temperature when it is used (particularly in low temperature below -15°C
(5°F)). It is necessary to use the fuel that is suitable for the temperature.
q Before starting the engine, or when 10 minutes have passed after adding fuel, drain the sediment and water
from the fuel tank.

q If the engine runs out of fuel, or if the filters have been replaced, it is necessary to bleed the air from the circuit.

4-5
OUTLINE OF SERVICE MAINTENANCE

COOLANT 4
q River water contains large amount of calcium and other impurities, so if it is used, scale will stick to the engine
and radiator, and this will cause defective heat exchange and overheating.

Do not use water that is not suitable for drinking.

q When using antifreeze, always observe the precautions given in the Operation and Maintenance Manual.

q Antifreeze is also effective in preventing corrosion on the parts of the engine cooling system. It may be contin-
uously used for two years or 4000 hours of operation, therefore it may be used throughout the year.

q Antifreeze is flammable, so be extremely careful not to expose it to flame or fire.

q The proper mixing proportion of the antifreeze depends on the ambient temperature. For the mixing propor-
tion, see “CLEAN INSIDE OF COOLING SYSTEM (4-23)“.

q If the engine overheats, wait for the engine to cool before adding coolant.

q If the coolant level is low, it will cause overheating and will also cause problems with corrosion from the air in
the coolant.

GREASE 4
q Grease is used to prevent twisting and noise at the joints.

q The nipples not included in the maintenance section are nipples for overhaul, so they do not need grease.
If any part becomes stiff after being used for long time, add grease.

q 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.

CARRYING OUT KOWA (Komatsu Oil Wear Analysis) 4

The oil clinic samples the oil periodically and analyzes it. This is a preventive maintenance service, which pro-
vides early discovery of abnormal parts and wear of the drive parts of the machine. This then makes it possible to
ensure prevention of failures and reduction in downtime.

Komatsu's long years of experience and rich supply of accumulated data make it possible to accurately determine
the condition of your machine. This enables us to locate the problems and to recommend suitable and timely
repair methods.

The oil clinic charges the customer only the actual costs, and provides an immediate report of the results of the
analysis and recommendations for action to take. This low-cost service can save you high costs and inconve-
nience in the future, so we strongly recommend you to avail yourself of this service.

KOWA ANALYSIS ITEMS

q Analysis of metal wear particles

This uses an ICP (Inductively Coupled Plasma) analyzer to

measure the density of metal wear particles in the oil.

4-6
MAINTENANCE OUTLINE OF SERVICE

q Measurement of particle quantity

This uses a PQI (Particle Quantifier Index) machine to
measure the quantity of large iron particles in the oil.

q Others

Measurements are made of items such as the ratio of water or fuel in the oil, and the dynamic viscosity.

OIL SAMPLING

q Sampling interval

250 hours: Engine

500 hours: Other components

q Precautions when sampling

q Make sure that the oil is well mixed before sampling.

q Perform sampling at regular fixed intervals.

q Do not perform sampling on rainy or windy days when water or dust can get into the oil.

For further details of KOWA, please contact your Komatsu distributor.

STORING OIL AND FUEL 4

q Keep indoors to prevent any water, dirt, or other impurities from getting in.

q When keeping drum cans for a long period, put the drum on its side so that the filler port of the drums is at the
side to prevent moisture from being sucked in.
If drums have to be stored outside, cover them with a waterproof sheet or take other measures to protect
them.

q 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).

FILTERS 4
q Filters are extremely important safety parts. They prevent impurities in the fuel and air circuits from entering
important equipment and causing problems.

Replace all filters periodically. For details, see the 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.
q Never try to clean the filters (cartridge type) and use them again. Always replace with new filters.

q When replacing oil filters, check if any metal particles are affixed to the old filter. If any metal particles are
found, contact your Komatsu distributor.

q Do not open packs of spare filters until just before they are to be used.

q Always use Komatsu genuine filters.

4-7
OUTLINE OF SERVICE MAINTENANCE

RELATING TO ELECTRIC SYSTEM 4

q It is extremely dangerous if the electrical equipment becomes wet or the covering of the wiring is damaged.
This will cause an electrical short circuit 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.

q Service relating to the electric system is checking fan belt tension, checking damage or wear to the fan belt
and checking battery fluid level.
q Never install any electric components other than those specified by Komatsu.

q External electro-magnetic interference may cause malfunction of the control system controller, so before
installing a radio receiver or other wireless equipment, contact your Komatsu distributor.

q When working at the seashore, carefully clean the electric system to prevent corrosion.

q When installing electrical equipment, connect it to the special power source connector.

Do not connect the optional power source to the fuse, starting switch, or battery relay.

4-8
MAINTENANCE WEAR PARTS LIST

WEAR PARTS LIST 4

Replace wear parts such as the filter element or air cleaner element at the time of periodic maintenance or before
they reach the wear limit. The wear parts should be replaced correctly in order to ensure more economic use of
the machine. When replacing parts, always use Komatsu genuine parts.

As a result of our continuous efforts to improve product quality, the part number may change, so inform your
Komatsu distributor of the machine serial number and check for the latest part number when ordering parts.

WEAR PARTS LIST 4

The parts in parentheses are to be replaced at the same time.

Replacement
Item Part No. Part Name Weight (kg) Q'ty
frequency
07063-01054 Element - 1
Power train filter
(07000-72100) (O-ring) - (1)
Fuel filter 6732-71-6112 Cartridge - 1 Every 500
hours service
Engine oil filter 6742-01-4120 Cartridge - 1
Corrosion resistor 6742-01-3970 Cartridge - 1
21W-60-41121
Hydraulic oil filter Cartridge - 1
(07000-12135) Every 2000
Hydraulic tank hours service
20Y-60-21470 Element - 1
breather element
Element Ass'y
Air cleaner 600-185-4100 - 1 -
(outer and inner)
Air condi- Fresh filter 14X-911-7750 Filter - 2
-
tioner Recirc filter 20y-979-6261 Filter - 1
13G-72-61420 Cutting edge (out) 2
24.3
13G-72-61410 Cutting edge (in) 1
D61PX Power 39.0
134-72-61450 End bit (left) 1
angle, power - -
134-72-61460 End bit (right) 1
tiltdozer -
(02090-11265) (Bolt) (32)
-
(02290-11219) (Nut) (32)
134-72-61420 Cutting edge (left) 1
36.8
134-72-61410 Cutting edge (right) 1
D61EX Power 24.3
134-72-61450 End bit (left) 1
Blade angle, power - -
134-72-61460 End bit (right) 1
tiltdozer -
(02090-11265) (Bolt) (27)
-
(02290-11219) (Nut) (27)
14Y-71-11210 Cutting edge (left) 45.5 1
13G-71-61410 Cutting edge (right) 39.0 1
D61PX Power 14Y-71-11330 End bit (left) - 1
-
tiltdozer 14Y-71-11340 End bit (right) - 1
(02090-11270) (Bolt) - (32)
(02290-11219) (Nut) - (32)

NOTICE
When handling parts that weigh more than 25 kg (55 lb), remember that they are heavy objects, and take
the necessary care.

4-9
USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE MAINTENANCE

USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING

TO AMBIENT TEMPERATURE 4

PROPER SELECTION OF FUEL, COOLANT AND LUBRICANTS 4

*1: ASTM D975 No.1

4-10
MAINTENANCE USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE

Final drive
Engine Damper Idler Hydraulic Power Fuel Cooling system
case
oil pan case (each) system train case tank (incl. sub-tank)
(each)
Specified Liter 23 1.3 0.22 95 100 32 390 44
capacity US gal 6.08 0.34 0.06 25.10 26.42 8.45 103.04 11.62
Refill Liter 19 1.3 0.22 55 69 28.5 - -
capacity US gal 5.02 0.34 0.06 14.53 18.23 7.52 - -

REMARK
When fuel sulphur content is less than 0.5%, change oil in the oil pan according to the periodic maintenance hours
described in this manual.
Change oil according to the following table if fuel sulfur content is above 0.5%.

When starting the engine with an atmospheric temperature of lower than 0°C (32°F), be sure to use engine oil of
SAE10W, SAE10W-30 and SAE15W-40, even though the atmospheric temperature goes up to 10°C (50°F) more
or less during the day.

Use API classification CD as engine oil and if API classification CC, reduce the engine oil change interval to half.

There is no problem if single grade oil is mixed with multigrade oil (SAE10W-30, 15W-40), but be sure to add sin-
gle grade oil that matches the temperature range in the table.

We recommend Komatsu genuine oil which has been specifically formulated and approved for use in engine and
hydraulic work equipment applications.

Specified capacity: Total amount of oil including oil for components and oil in piping.

Refill capacity: Amount of oil needed to refill system during normal inspection and maintenance.

ASTM: American Society of Testing and Material

SAE: Society of Automotive Engineers
API: American Petroleum Institute

Change interval of oil in

Fuel sulfur content
engine oil pan
0.5 to 1.0% 1/2 of regular interval
Above 1.0% 1/4 of regular interval

4-11
USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE MAINTENANCE

Engine Oil
Anti-freeze
[CD or CE]
Gear Oil Grease Coolant
SAE10W, 30, 40
No. Supplier [GL-4 or GL-5] [Lithium-Base] [Ethylene Glycol
10W30, 15W40
SAE80, 90, 140 NLGI No.2 Base]
(The 15W40 oil
Permanent Type
marked * is CE.)
EO10-CD AF-ACL
EO30-CD GO90 G2-LI AF-PTL
1 KOMATSU
EO10-30CD GO140 G2-LI-S AF-PT(Winter, one
EO15-40CD season type)
Diesel sigma S
super dieselmulti-
2 AGIP Rotra MP GR MU/EP -
grade
*Sigma turbo
Multi-purpose gear PYKON premium
3 AMOCO *Amoco 300 -
oil grease
Litholine HEP 2
4 ARCO *Arcofleet S3 pius Arco HD gear oil -
Arco EP moly D
Gear oil EP
5 BP Vanellus C3 Energrease LS-EP2 Antifreeze
Hypogear EP
*RPM delo 400 Universal thuban Marfak all purpose 2
6 CALTEX AF engine coolant
RPM delo 450 Universal thuban EP Ultra-duty grease 2
EP
*Turbomax EPX
MS3
7 CASTROL *RX super Hypoy Anti-freeze
Spheerol EPL2
CRD Hypoy B
Hypoy C
8 CHEVRON *Delo 400 Universal gear Ultra-duty grease 2 -
Universal gear
9 CONOCO *Fleet motor oil Super-sta grease -
lubricant
Multiperformance 3C Tranself EP
10 ELF - Glacelf
Performance 3C Tranself EP type 2
Essolube D3
*Essolube XD-3
EXXON Gear oil GP
11 *Essolube XD-3 Extra Beacon EP2 All season coolant
(ESSO) Gear oil GX
*Esso heavy duty
Exxon heavy duty
Super duty motor oil Multi-purpose gear Gulfcrown EP2 Antifeeze and cool-
12 GULF
*Super duty plus lubricant Gulfcrown EP special ant
Delvac 1300 Mobilux EP2
Mobilube GX
13 MOBIL *Delvac super Mobilgease 77 -
Mobilube HD
10W-30, 15W-40 Mobilgrease special

4-12
MAINTENANCE USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE

Engine Oil
Anti-freeze
[CD or CE]
Gear Oil Grease Coolant
SAE10W, 30, 40
No. Supplier [GL-4 or GL-5] [Lithium-Base] [Ethylene Glycol
10W30, 15W40
SAE80, 90, 140 NLGI No.2 Base]
(The 15W40 oil
Permanent Type
marked * is CE.)
Multi-purpose white
*Supreme duty Multi-purpose 4092 grease 705 Anti-freeze and
14 PENNZOIL
fleet motor oil Multi-purpose 4140 707L White-bearing summer coolant
grease
PETRO- FINA potonic N
15 FINA kappa TD FINA marson EPL2 FINA tamidor
FINA FINA potonic NE
Spirax EP
16 SHELL Rimura X Albania EP grease -
Spirax heavy duty
Sunoco ultra prestige Sunoco antifreeze
Sunoco GL5
17 SUN - 2EP and summer cool-
gear oil
Sun prestige 742 ant
*Ursa super plus Multifak EP2 Coda 2055 startex
18 TEXACO Multigear
Ursa premium Starplex 2 antifreeze coolant
Total EP
Rubia S
19 TOTAL Total Transmission Multis EP2 Antigal/antifreeze
*Rubia X
TM
20 UNION *Guardol MP gear lube LS Unoba EP -
*Turbostar Multigear
21 VEEDOL *Diesel star Multigear B - Antifreeze
MDC Multigear C

4-13
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS MAINTENANCE

STANDARD TIGHTENING TORQUES FOR BOLTS AND

NUTS 4

TORQUE LIST 4

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 pay careful attention 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, always use a Komatsu genuine part of the same size as the part that
was replaced.

Thread Width Tightening torque

diameter across Target value Service limit
of bolt flats
(a)(mm) (b)(mm) N·m kgf·m lbft N·m kgf·m lbft
6 10 13.2 1.35 9.8 11.8-14.7 1.2-1.5 8.7-10.8
8 13 31 3.2 23.1 27-34 2.8-3.5 20.3-25.3
10 17 66 6.7 48.5 59-74 6.0-7.5 43.4-54.2
12 19 113 11.5 83.2 98-123 10.0-12.5 72.3-90.4
14 22 172 17.5 126.6 153-190 15.5-19.5 112.1-141
16 24 260 26.5 191.7 235-285 23.5-29.5 170.0-213.4
18 27 360 37 267.6 320-400 33.0-41.0 238.7-296.6
20 30 510 52.3 378.3 455-565 46.5-58.0 336.3-419.5
22 32 688 70.3 508.5 610-765 62.5-78.0 452.1-564.2
24 36 883 90 651 785-980 80.0-100.0 578.6-723.3
27 41 1295 132.5 958.4 1150-1440 118.0-147.0 853.5-1063.3
30 46 1720 175.0 1265.8 1520-1910 155.0-195.0 1121.1-1410.4
33 50 2210 225.0 1627.4 1960-2450 200.0-250.0 1446.6-1808.3
36 55 2750 280.0 2025.2 2450-3040 250.0-310.0 1808.3-2242.2
39 60 3280 335.0 2423.1 2890-3630 295.0-370.0 2133.7-2676.2

Apply the following table for Hydraulic Hose.

Width Tightening torque

Nominal - No. across Target value Permissible range
of threads (a) flats (b)
(mm) N·m kgf·m lbft N·m kgf·m lbft
9/16 -18UNF 19 44 4.5 32.5 35 - 63 3.5 - 6.5 25.3 - 47.0
11/16 -16UN 22 74 7.5 54.2 54 - 93 5.5 - 9.5 39.8 - 68.7
13/16 -16UN 27 103 10.5 75.9 84 - 132 8.5 - 13.5 61.5 - 97.6
1 -14UNS 32 157 16.0 115.7 128 - 186 13.0 - 19.0 94.0 - 137.4
13/16 -12UN 36 216 22.0 159.1 177 - 245 18.0 - 25.0 130.2 - 180.8

4-14
MAINTENANCE PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS

PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS 4

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 important parts.

Material quality of these parts can change as time passes and they are likely to wear out or deteriorate. However,
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 impor-
tant 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 peri-
odic 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 to be replaced periodically. Tighten all loose
clamps 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 critical parts.

SAFETY CRITICAL PARTS 4

No. Safety critical parts for periodic replacement Q'ty Replacement interval
1 Fuel hose (fuel tank - injection pump) 1
2 Fuel hose (injection pump - fuel filter) 2
3 Fuel return hose (injection pump - fuel tank) 1
4 Fuel return hose (injection nozzle - fuel tank) 1
5 Hose (PPC charge valve - PPC valve) 1
6 Hose (hydraulic tank - PPC valve) 1
7 Hose (PPC valve - main valve) 2
8 PPC pressure detection hose 1
9 Hose (PPC charge valve - hydraulic tank) 1
10 Hose (power train strainer - power train pump) 1
11 Hose (power train pump - power train filter) 1
12 Hose (power train filter - transmission case) 1
13 Hose (transmission case - steering case) 1 Every 2 years or 4000
hours, whichever comes
14 Hose (power train lubrication pump - steering case) 1
sooner
15 Hose (Scavenging pump - Steering case) 1
16 Hose (torque converter case - transmission oil cooler) 1
17 Hose (transmission oil cooler - transmission case) 1
18 Brake pressure detection hose 1
19 Torque converter inlet post pressure detection hose 1
20 Torque converter outlet post pressure detection hose 1
21 Transmission modulation pressure detection hose 1
22 Hose (hydraulic oil tank - HSS pump) 2
23 Hose (HSS pump - PPC pump) 1
24 Hose (HSS pump - main valve) 1
25 Hose (main valve - HSS motor) 2
26 Hose (HSS motor - hydraulic tank) 2
27 Seat belt 1 Replace 3 years

4-15
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS MAINTENANCE

4-16
MAINTENANCE MAINTENANCE SCHEDULE CHART

MAINTENANCE SCHEDULE CHART 4

MAINTENANCE SCHEDULE CHART 4

WHEN REQUIRED 4
Check, clean and replace air cleaner element .................................................................................................. 4-194
Clean inside of cooling system.......................................................................................................................... 4-234
Check track shoe tension, adjust ...................................................................................................................... 4-264
Check and tighten track shoe bolts ................................................................................................................... 4-284
Check electrical intake air heater ...................................................................................................................... 4-284
Reverse and replace end bits and cutting edges .............................................................................................. 4-294
Clean, check radiator fins.................................................................................................................................. 4-314
Check, adjust air conditioner............................................................................................................................. 4-334
Grease door hinge ............................................................................................................................................ 4-344
Check door lock striker...................................................................................................................................... 4-344
Replace door damper........................................................................................................................................ 4-344
Check door latch ............................................................................................................................................... 4-354
Check window washer fluid level, add fluid....................................................................................................... 4-354
Replace wiper blade.......................................................................................................................................... 4-364
Check idler oil level, add oil............................................................................................................................... 4-374
Adjust idler clearance........................................................................................................................................ 4-384
Check link pitch ................................................................................................................................................. 4-384
Check outside diameter of track roller............................................................................................................... 4-394
Check height of grouser .................................................................................................................................... 4-394
Adjust play in center ball ................................................................................................................................... 4-404
Lubricating universal joint.................................................................................................................................. 4-414
Procedure for bleeding air in hydraulic system ................................................................................................. 4-424

CHECK BEFORE STARTING 4

EVERY 50 HOURS SERVICE 4

Drain water, sediment from fuel tank ................................................................................................................ 4-444

EVERY 250 HOURS SERVICE 4

Lubricating......................................................................................................................................................... 4-454
Grease equalizer bar side pin ........................................................................................................................... 4-474
Grease equalizer bar center pin........................................................................................................................ 4-474
Check oil level in final drive case, add oil.......................................................................................................... 4-484
Check oil level in hydraulic tank, add oil ........................................................................................................... 4-484
Check level of battery electrolyte ...................................................................................................................... 4-494
Clean water separator strainer.......................................................................................................................... 4-514
Check brake performance................................................................................................................................. 4-524
Check air conditioner compressor belt tension, adjust...................................................................................... 4-534
Clean air conditioner air filter (fresh/recirc filter) ............................................................................................... 4-544

EVERY 500 HOURS SERVICE 4

Replace fuel filter cartridge ............................................................................................................................... 4-554
Change oil in engine oil pan, replace engine oil filter cartridge......................................................................... 4-564
Replace corrosion resistor cartridge ................................................................................................................. 4-574
Replace power train oil filter element ................................................................................................................ 4-574

4-17
MAINTENANCE SCHEDULE CHART MAINTENANCE

EVERY 1000 HOURS SERVICE 4

Change oil in power train case, clean strainers (power train strainer, scavenging pump strainer) ................... 4-584
Check oil level in damper case, add oil ............................................................................................................. 4-604
Change oil in final drive case ............................................................................................................................ 4-614
Clean breather .................................................................................................................................................. 4-614
Check all tightening parts of turbocharger ........................................................................................................ 4-624
Check play of turbocharger rotor....................................................................................................................... 4-624
Check for loose ROPS mount bolts .................................................................................................................. 4-624

EVERY 2000 HOURS SERVICE 4

Change oil in hydraulic tank, replace oil filter element ...................................................................................... 4-634
Replace hydraulic tank breather element.......................................................................................................... 4-644
Change oil in damper case ............................................................................................................................... 4-654
Clean, check turbocharger ................................................................................................................................ 4-664
Check vibration damper .................................................................................................................................... 4-664
Check alternator, starting motor........................................................................................................................ 4-664
Check engine valve clearance, adjust............................................................................................................... 4-664

EVERY 4000 HOURS SERVICE 4

Check water pump ............................................................................................................................................ 4-674

4-18
MAINTENANCE SERVICE PROCEDURE

SERVICE PROCEDURE 4

WHEN REQUIRED 4

CHECK, CLEAN AND REPLACE AIR CLEANER ELEMENT 4

WARNING
q If inspection, cleaning, or maintenance is carried out with the engine running, dirt will get into the
engine and damage it. Always stop the engine before carrying out these operations.

q When using compressed air, there is danger that dirt may be blown around and cause serious injury.
Always use protective glasses, dust mask, and other protective equipment.

CHECKING

If the yellow piston at the display portion of dust indicator (1)

becomes red (7.5 kPa), clean the outer element.

NOTICE
Do not clean the filter element until after a yellow piston in
the dust indicator display has come in the red area (7.5
kPa).
If the filter element is cleaned frequently before the yellow
piston in the dust indicator display comes in the red area
(7.5 kPa), the air cleaner cannot exert its inherent cleaning
capability, reducing its cleaning effect.
In addition, dust sticking to the element falls into the inner
element each time the element is cleaned.

CLEANING OR REPLACING OUTER ELEMENT

1. Open the left engine side cover.

2. Remove four clips (2), then remove cover (3).

NOTICE
Never remove inner element (5). If it is removed, dust will
enter and cause engine trouble.

3. Remove outer element (4).

4-19
SERVICE PROCEDURE MAINTENANCE

4. Clean the interior of the air cleaner body, cover (3) and evacuator valve (6).

NOTICE
The inner element must not be used again even after
cleaning. When replacing the outer element, replace the
inner element at the same time.

5. Direct dry compressed air (Max. 0.69 MPa (7 kgf/cm2, 99.4

PSI)) from the inside of the outer element along its folds.
Then direct the compressed air from the outside along the
folds, and again from the inside.
6. Replace any outer element which has been cleaned 6
times or used for one year. Replace the inner element at
the same time.

7. Even if the outer element has not been cleaned 6 times, if

the yellow piston in the dust indicator goes to the 5 kPa
position immediately after cleaning (when the engine is
running at high idling, replace both the inner and the outer
element.

REMARK
On machines equipped with a high suction resistance precleaner or rain cap, if the yellow piston goes above the
7.5 kPa position immediately after cleaning, replace both the inner and the outer element.

8. If small holes or thinner parts are found on the element

when it is checked by shining a light through it after clean-
ing, replace the element.

NOTICE
When cleaning the element, do not hit or beat it against
anything.
Do not use an element whose folds, gasket or seal are
damaged.

9. Before installing the outer element, check that the inner

element is fitted securely. If the inner element is not fitted
securely, push it in properly.

CAUTION
When installing the cover (3), check O-ring (7) and replace
it if there are any scratches or damage.

10. Set the cleaned outer element in position, then secure

cover (3) with mounting clips (2).

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MAINTENANCE SERVICE PROCEDURE

11. Push the button of dust indicator (1) and return the yellow
piston to its original position.
12. Close the left engine side cover.

REPLACING ELEMENT

1. Open the left engine side cover.

2. Remove four clips (2), then remove cover (3).

3. Remove outer element (4).

Do not remove inner element (5) at this time, however.

4. Clean the interior of the air cleaner body, cover (3) and
evacuator valve (6).

NOTICE
If the outer element and cover are installed when the inner
element is not installed properly, the outer element may
break.
When installation is correct, protrusion “a“ of the inner
element from the air cleaner body is 35 mm.

5. Remove inner element (5), then quickly install the new inner element.

Push the inner element in properly and check that it is fitted securely.

6. Set the new outer element (4) in position.

7. Replace O-ring (7) for cover (3) with new one.

8. Set the arrow mark on cover (3) at the top, install to the air
cleaner body, then secure with clip (2).

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SERVICE PROCEDURE MAINTENANCE

9. Push the button of dust indicator (1) and return the yellow
piston to its original position.

REMARK
The yellow piston in the dust indicator may go to a position
between 3.7 kPa - 5.0 kPa immediately after the element has
been replaced with a new element, but this does not indicate
any abnormality.
On machines equipped with a high suction resistance pre-
cleaner or rain cap, the yellow piston in the dust indicator may
go to a position between 5.0 kPa - 6.2 kPa immediately after
the element has been replaced with a new element, but this
does not indicate any abnormality.

10. Close the left engine side cover.

4-22
MAINTENANCE SERVICE PROCEDURE

CLEAN INSIDE OF COOLING SYSTEM 4

WARNING
q Just after the engine is stopped, the coolant is still hot and the internal pressure in the radiator is still
high. If the radiator cap is removed under this condition, you may scald yourself. Accordingly, wait
until the temperature goes down, then loosen the cap slowly to release the pressure.

q Start the engine to clean the cooling system. When standing up from the operator's seat or leaving the
machine, set the work equipment lock lever and parking brake lock lever to the LOCK positions.

q For the starting method of the engine, see “CHECK BEFORE STARTING ENGINE, ADJUST (3-72)“ and
“STARTING ENGINE (3-89)“ in the OPERATION section of the manual.

q Never go under the machine body while the engine is running. It is very dangerous since the machine
may move suddenly.

Stop the machine on level ground when cleaning or changing the coolant.

When flushing the inside of the cooling system, do as follows.

Cleaning inside of cooling system

Kind of coolant Replace corrosion resistor
and changing coolant
Permanent type antifreeze Every year (autumn) or every 2000
(All season type) hours whichever comes first
Non permanent type antifreeze con- Every 6 months (spring, autumn) Every 500 hours and when cleaning
taining ethylene glycol (Drain antifreeze in spring, add anti- the inside of the cooling system and
(Winter, one season type) freeze in autumn) when changing coolant
Every 6 months or every 1000 hours
When not using antifreeze
whichever comes first

Use a permanent type of antifreeze.

If, for some reason, it is impossible to use permanent type antifreeze, use an antifreeze containing ethylene glycol.

The ratio of antifreeze to water depends on the ambient temperature, but to obtain the corrosion resistance effect,
a minimum ratio of 30% by volume is necessary.

When deciding the ratio of antifreeze to water, check the lowest temperature in the past, and decide from the mix-
ing rate table given below.

It is actually better to estimate a temperature about 10°C (18°F) lower when deciding the mixing rate.

Mixing rate of water and antifreeze

Min. °C Above -10 -15 -20 -25 -30

atmospheric
temperature °F Above 14 5 -4 -13 -22
Amount of Liters 13.2 15.8 18.0 20.2 22.0
antifreeze US gal 3.49 4.17 4.76 5.34 5.81
Amount of Liters 30.8 28.2 26.0 23.8 22.0
water US gal 8.13 7.45 6.86 6.28 5.81

4-23
SERVICE PROCEDURE MAINTENANCE

WARNING
Antifreeze is flammable, so keep it away from flame.
Antifreeze is toxic. When removing the drain plug, be careful not to get water containing antifreeze on
you. If it gets in your eyes, flush your eyes with large amount of fresh water and see a doctor at once.

Use city water for the coolant.

If river water, well water or other such water supply must be used, contact your Komatsu distributor.

We recommend use of an antifreeze density gauge to control the mixing proportions.

q Prepare a container having capacity of at least 45 liters (11.89 US gal)to receive the antifreeze solution.

1. Stop the engine.

2. Open cover (1), then turn the radiator cap (2) slowly until it
contacts the stopper to relieve the pressure.

3. Following this, push radiator cap (2), turn it until it contacts

the stopper, then remove it.

4. Remove cover (3), set a container under the radiator, open

drain valve (4) at the bottom of the radiator, and drain the
coolant into the container.

5. Open the side cover on the right side of the engine, remove
cover (5), then open drain valve (6) in the side face of the
cylinder block and drain the coolant.

6. After draining the antifreeze solution, close drain valve (4),

(6), then fill with clean water. After the radiator is filled with
water, start and run the engine at low idling speed. After
the water temperature rises above 90°C (194°F), run the
engine for about 10 minutes.

7. Stop the engine and open drain valve (4), (6) to drain the
water.

8. After draining the water, clean the cooling system with

cleaning agent.

For the cleaning method, see the instructions for the clean-
ing agent.

9. Add coolant until it overflows from the water filler.

Decide the proportions of antifreeze and water according to the table for the mixing rate of water and anti-
freeze.

10. To remove air in the cooling system, run the engine for 5 minutes at low idle, then for 5 minutes at high idle.
(While doing this, leave the radiator cap removed.)

4-24
MAINTENANCE SERVICE PROCEDURE

11. Open the engine side cover on the left side of the chassis.
12. Drain the cooling water inside sub-tank (7), clean the inside
of the sub-tank, then fill again with cooling water to a point
midway between the FULL and LOW marks.

13. Stop the engine and tighten the cap. Check the coolant
level, and add water if the level is low.

4-25
SERVICE PROCEDURE MAINTENANCE

CHECK TRACK SHOE TENSION, ADJUST 4

The wear of pins and bushings on the undercarriage will vary with the working conditions and types of soil. It is
thus necessary to continually inspect the track tension so as to maintain the standard tension.

Carry out the check and adjustment under the same conditions as when operating (on jobsites where the track
becomes clogged with mud, measure with the track clogged with mud).

INSPECTION

Stop the machine on level ground (stop with the transmission in

FORWARD without applying the brake). Then place a straight
bar on the track shoes between the carrier roller and the idler
as shown in the figure, and measure the clearance between
the bar and the grouser at the midpoint. If the clearance (a) is
20 to 30 mm (0.79 to 1.18 in), the tension is standard.

If the track tension is not at the standard value, adjust it in the

following manner.

ADJUSTMENT

WARNING
There is danger of plug (1) flying out under the high inter-
nal pressure of the grease. Never loosen plug (1) more
than 1 turn.
Never loosen any part other than plug (1). Never put your
face in the mounting direction of plug (1).
If the track tension cannot be loosened with the procedure
given here, please contact your Komatsu distributor.

WHEN INCREASING TENSION

Prepare a grease gun.

1. Pump in grease through grease fitting (2) with a grease

pump.
2. To check that the correct tension has been achieved, move
the machine backwards and forwards.

3. Check the track tension again, and if the tension is not cor-
rect, adjust it again.

4-26
MAINTENANCE SERVICE PROCEDURE

4. Continue to pump in grease until S becomes 0 mm. If the

tension is still loose, the pin and bushing are excessively
worn, so they must be either turned or replaced. Please
contact your Komatsu distributor.

WHEN LOOSENING TENSION

WARNING
It is extremely dangerous to release the grease by any method except the procedure given below. If the
track tension is not relieved by this procedure, please contact your Komatsu distributor.

1. Loosen plug (1) gradually to release the grease.

2. When loosening plug (1), turn it a maximum of one turn.

3. If the grease does not come out smoothly, move the

machine forwards and backwards a short distance.

4. Tighten plug (1).

5. To check that the correct tension has been achieved, move

the machine backwards and forwards.

6. Check the track tension again, and if the tension is not cor-
rect, adjust it again.

4-27
SERVICE PROCEDURE MAINTENANCE

CHECK AND TIGHTEN TRACK SHOE BOLTS 4

If the machine is used with track shoe bolts (1) loose, they will
break, so tighten any loose bolts immediately.

METHOD OF TIGHTENING (TRACK SHOE BOLTS)

1. Torque the track shoe bolts to 539 ± 49 N·m (55 ± 5 kg·m, 398 ± 36.2 lb ft). Then ensure the nut and shoes are
in close contact with the link contact surface.
2. After checking, tighten a further. 120° ± 10°.

METHOD OF TIGHTENING (MASTER CONNECTING BOLT)

1. First tighten to a tightening torque of 343 ± 39 N·m (35 ± 4 kgf·m, 253 ± 29 lbft) then check that the link contact
surfaces are in close contact.

2. After checking the link contact surfaces, tighten the bolt by 180° (Allowable range: 0° - 20°).

ORDER FOR TIGHTENING

Tighten the bolts in the order shown in the diagram on the right.

CHECK ELECTRICAL INTAKE AIR HEATER 4

Before the start of the cold season (once a year), contact your Komatsu distributor to have the electrical intake air
heater repaired or checked for dirt or disconnections.

4-28
MAINTENANCE SERVICE PROCEDURE

REVERSE AND REPLACE END BITS AND CUTTING EDGES 4

WARNING
When carrying out this operation, it is extremely dangerous if the work equipment is moved by mistake.
Set the work equipment in a stable condition, stop the engine, and set the work equipment lock lever
securely to the LOCK position.

Reverse or replace the end bits and cutting edges before it is worn out to the blade end.

1. Raise the blade to a proper height, apply a block under the frame to prevent the blade from falling.
2. Set the work equipment lock lever to the LOCK position and stop the engine.

3. Measure the wear of the end bit and cutting edge in accordance with the wear standards given below.

Wear standards

Wear standards Unit [mm (in)]

Item Judgement standard
Work Standard
No. Measurement point Repair limit
equipment dimension
A 237 (9.3) 204 (8.0)
Height of outside of
1 B 237 (9.3) 204 (8.0)
end bit
C 237 (9.3) 204 (8.0)
A 325 (12.8) 300 (11.8)
2 Width of end bit B 325 (12.8) 300 (11.8)
C 325 (12.8) 300 (11.8)
A 204 (8.0) 187 (7.4)
Height of inside of
3 B 204 (8.0) 187 (7.4)
end bit
C 204 (8.0) 187 (7.4)
Height of cutting edge A 102 (4.0) 85 (3.3)
(from center of bolt B 102 (4.0) 85 (3.3)
4
mounting hole to end
face) C 102 (4.0) 85 (3.3)

The symbols in the work equipment column have the following meaning.

A: Power angle, powertilt dozer (D61EX)

B: Power angle, powertilt dozer (D61PX)

C: Powertilt dozer (D61PX)

D: Semi-U blade (D61EX)

REMARK
If the cutting edge and the end bit on both sides are worn out, replace with new one.
If it has been worn out up to the fitting surface, repair the fitting surface and then reverse or replace.

4. Remove the cutting edge and the end bit and clean the mounting surface.

5. Reverse or replace the cutting edge and the end bit when worn out.

4-29
SERVICE PROCEDURE MAINTENANCE

6. Remove nut (1) and bolt (2), then replace or reverse the
cutting edge and the end bit.
7. Install the cutting edge to the blade and tighten the bolt
temporarily. Press the blade against the ground to elimi-
nate the play of bolt (2), then tighten the bolt to the speci-
fied torque.

Nut tightening torque:

Power angle, powertilt dozer (EX,PX): 461 ± 69 N·m (47 ± 7 kgf·m, 340 ± 51 lbft)
Powertilt dozer(PX): 461 ± 69 N·m (47 ± 7 kgf·m, 340 ± 51 lbft)

Semi-U dozer (EX) (cutting edge): 461 ± 69 N·m (47 ± 7 kgf·m, 340 ± 51 lbft)

Semi-U dozer (EX) (end bit): 745 ± 108 N·m (76 ± 11 kgf·m, 549.7 ± 79.6 lbft)
If bolt (2) and nut (1) are damaged, replace them with new ones at the same time.

8. After several hours of running, retourque the nuts.

4-30
MAINTENANCE SERVICE PROCEDURE

CLEAN, CHECK RADIATOR FINS 4

If the radiator fins are clogged or dirty, clean and inspect them.

CLEANING BY ROTATING COOLING FAN IN REVERSE DIRECTION

NOTICE
When rotating the cooling fan in the reverse direction, be
extremely careful of flying dust.
When stopping the engine when the cooling fan is rotating
in the reverse direction, first run the engine at low idling,
then stop it.

The dust and dirt stuck to the radiator and cooler can be blown
out by rotating the cooling fan in the reverse direction.
1. Turn starting switch (1) to the OFF position and stop the engine.

2. Turn starting switch (1) to the ON position.

3. Set fan rotation selector switch (2) to the cleaning position

(CLN:(C)).

REMARK
If the engine is running, the direction of rotation of the fan will
not change even when the fan rotation selector switch is oper-
ated.
Fan operation confirmation lamp (3) will flash to inform the
operator that the direction of rotation of the fan has not been
switched.
Stop the engine, then start it again. The direction of rotation of
the fan will be switched.

4. Turn starting switch (1) to the START position and start the engine. The cooling fan will rotate in the reverse
direction.

5. Run the engine at high idling.

Select the time for running the engine at high idling as follows according to the condition of clogging.

Normal clogging: 1 to 2 minutes

Excessive clogging: 2 to 3 minutes

6. After completing the cleaning, run the engine at low idling for approx. 10 seconds.

7. Turn starting switch (1) to the OFF position and stop the engine.

8. Turn starting switch (1) to the ON position.

4-31
SERVICE PROCEDURE MAINTENANCE

9. Turn the fan rotation selector switch (2) to the normal rotation position (a) and cancel the reverse rotation.

10. After cleaning, inspect the engine room and remove any dirt.

CLEANING WITH COMPRESSED AIR

WARNING
q Directing compressed air, pressurized water, or steam directly at your body, or using these and caus-
ing dust to fly may cause personal injury. Always wear protective glasses, anti-dust mask, and other
protective equipment.

q When carrying out cleaning, always stop the engine and check that the fan is not rotating. If you touch
the fan when it is rotating, it will cause serious personal injury.

If there is severe clogging of the radiator fins with dust, use compressed air to clean.

1. Remove bolts (1) (6 bolts).

2. Open the radiator mask (2).

3. Clean the radiator fins clogged with mud, dust and leaves
with compressed air. Steam or water may be used instead
of compressed air.

4. Remove bolt (3), then remove cover (4).

5. After removing cover (4) remove bolts (5) inside the cover.

6. Swing hydraulic cooler (6) to the rear to make a gap

between the cooler and the radiator.

7. Using compressed air, blow out all mud, dirt, or leaves

clogging the hydraulic cooler. It is also possible to use
steam or water instead of compressed air.

REMARK
Check the hydraulic cooler hoses. If any hose is cracked or
hardened by age, replace with a new hose. Also check and
tighten all loose hose clamps.

8. After completing the cleaning operation, return hydraulic

cooler (6), radiator mask (2), and cover (4) to their original
positions.

4-32
MAINTENANCE SERVICE PROCEDURE

CHECK, ADJUST AIR CONDITIONER 4

(Machines equipped with cab)

CHECK LEVEL OF REFRIGERANT

WARNING
If the refrigerant used in the air conditioner gets into your eyes or on your hands, it may cause loss of
sight or frostbite. Do not touch the refrigerant. Never loosen any part of the refrigerant circuit.
Do not bring any 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. Run the engine at high idling, and check the flow
of the refrigerant gas (freon 134a) in the refrigerant circuit
through the sight glass (2) (inspection window) of the receiver
(1) when the cooler is running at high speed.
q (A) Correct: No bubbles are included in the flow

q (B) Low: Bubbles are included in the flow

(bubbles pass continuously)

q (C) None: Colorless, transparent

REMARK
When there are bubbles, the refrigerant gas level is low, so
contact your Komatsu distributors to have refrigerant added. If
the air conditioner is run with the refrigerant gas level low, it will
cause damage to the compressor.

OPERATING AIR CONDITIONER OFF-SEASON

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.

4-33
SERVICE PROCEDURE MAINTENANCE

GREASE DOOR HINGE 4

(Machines equipped with cab)

If the door makes a squeaking noise when it is opened or

closed, spray lubricant in through the split in the hinge bushing.

If the bushing is worn, replace the hinge.

CHECK DOOR LOCK STRIKER 4

(Machines equipped with cab)

If wear (A) of the door of lock striker exceeds 0.5 mm (0.02 in),
replace the striker. If it is used as it is, the play will increase
and this may result in breakage of the hinge or door lock.

REPLACE DOOR DAMPER 4

(Machines equipped with cab)

If depth (A) of the groove of door damper rubber (1) is less than
2 mm (0.08 in), replace the damper.

There are 4 dampers: 1 each at the top and bottom on the left
and right doors.

4-34
MAINTENANCE SERVICE PROCEDURE

CHECK DOOR LATCH 4

(Machines equipped with cab)

Hold the door open and check that there is still grease inside
the latch. If the amount of grease is low or there is no more
grease, coat the inside of the latch with grease from portion (1).

REMARK
If there is no more grease inside the latch, the movement will
become poor because of dust inside the latch, and the handle
may be stiff when opening the door.

CHECK WINDOW WASHER FLUID LEVEL, ADD FLUID 4

(Machines equipped with cab)

If there is air in the window washer fluid, check the level and
add fluid.

Open the engine side cover on the left side, check the level of
the fluid in window washer tank (1), and if it is low, add automo-
bile window washer fluid.

When adding fluid, be careful not to let any dust get in.

PROPORTION FOR MIXING FLUID WITH WATER

The proportion differs according to the ambient temperature, so dilute the washer fluid with water to the following
proportions before adding.

Area, season Proportions Freezing temperature

Washer fluid 1/3: -10°C
Normal
water 2/3 (14°F)
Washer fluid 1/2 : -20°C
Winter in cold area
water 1/2 (-4°F)
Winter in extremely -30°C
Pure washer fluid
cold area (-22°F)

There are two types depending on the freezing temperature:

-10°C (14°F) (general use) and -30°C (-22°F) (cold area use), so select according to the area and season.

4-35
SERVICE PROCEDURE MAINTENANCE

REPLACE WIPER BLADE 4

(Machines equipped with cab)

If the blade is damaged, it will not wipe the window clean, so

replace the blade.

REPLACEMENT

FRONT, DOOR WIPER

1. It is hooked at portion (A), so move the blade in the direc-

tion of the arrow to remove it.

2. Install the new blade and hook it securely.

REAR WIPER

1. Remove E-ring (1).

The blade can then be removed.

2. Install a new blade, then install securely with E-ring (1).

4-36
MAINTENANCE SERVICE PROCEDURE

CHECK IDLER OIL LEVEL, ADD OIL 4

WARNING
If the oil level in the idler is low, new oil must be added, and the machine body must be inclined in this
case. Since this work is dangerous, ask your Komatsu distributor.

If the oil level in the idler is low, noise will be generated and there will be seizure, so check the oil level and add oil
as follows.

INSPECTION

1. Remove bolt (1), then remove guide plate (2) and shim (3).

REMARK
When removing shim (3) keep it in a safe place and be careful
not to lose it.

2. Loosen plug (4) slowly. If oil oozes through the threads at

this time, the quantity of oil is sufficient. Tighten plug (4).

3. If any oil does not flow out when plug (4) is removed, the
quantity of oil is insufficient. In this case, ask your Komatsu
distributor for add oil.

4. Install guide plate (2) and shim (3) with bolt (1).

REMARK
When installing guide plate (2), install the same number and
thickness of shim (3) as removed in Step 1.
The optimum clearance may be obtained, if the adjustment is
made at the same time. For details of adjusting the shim thick-
ness, see “ADJUST IDLER CLEARANCE (4-38)“.

4-37
SERVICE PROCEDURE MAINTENANCE

ADJUST IDLER CLEARANCE 4

Since the idlers are forced to move forward and backward by an external force guide plates will be worn out.

Wear of these plates will cause the vibration of idlers from side to side or inclination of the idlers, and running off of
track links from the idlers or unevenly worn idler and links may result.

Therefore, adjust the idlers according to the following procedure.

ADJUSTMENT

1. Travel for 1 or 2 meters on flat ground, then measure clear-

ance (A) between track frame (1) and guide plate (2) (4
places: left, right, inside, outside).

2. If the clearance (A) exceeds 4.0 mm (0.16 in), loosen bolt

(3), and pull out the shim to adjust the clearance at one
end to 0.5 to 1.0 mm (0.02 to 0.04 in).
Thickness of one shim is 1.0 mm (0.04 in).

CHECK LINK PITCH 4

If the measured value comes close to the repair limit, please contact your Komatsu distributor.

1. Insert a wooden block between track shoe and sprocket to

take up the slack in track shoes.

2. Measure the pitch length (L) of 4 links at a straight portion

at least 2 links from master pin (A). Divide this measure-
ment by four to obtain the link pitch.

q Basic link pitch (P): 190 mm (7.5 in)

q Link pitch limit for turning: 193 mm (7.6 in)

There is no link window on the master link.

REMARK
The measured value under decimal of link pitch is different
from the basic value depending upon the precision of measure
or the tolerance of product even if it isn't worn out.
Don't judge it's worn out too soon, do it with the trend of mea-
sured value after that.

4-38
MAINTENANCE SERVICE PROCEDURE

CHECK OUTSIDE DIAMETER OF TRACK ROLLER 4

If the measured value comes close to the repair limit, please contact your Komatsu distributor.

1. Measure the height (dimension C) of the link tread as

shown in the diagram.

2. Stop machine at position where link tread, whose size C

has been measured completely, contacts roller tread. Then
measure size B.

3. Calculate outside diameter of tread (size A):

A = (B - C) x 2

q Standard size (A): 200 mm (7.9 in)

q Repair limits: 164 mm (6.5 in)

CHECK HEIGHT OF GROUSER 4

If the measured value comes close to the repair limit, please

contact your Komatsu distributor.

After taking up slack in track shoes, measure height at center

of shoe as shown below.
q Standard height (h): 55.5 mm (2.2 in)

q Repair limits: 16.5 mm (0.7 in)

4-39
SERVICE PROCEDURE MAINTENANCE

ADJUST PLAY IN CENTER BALL 4

(Power angle, power tiltdozer only)

WARNING
When adjusting, always set the work equipment lock lever to the LOCK position except when operating
the blade.

It is necessary to adjust the shim at the center ball in the following cases.
q When there is play at the center ball.

q When assembling the blade again after it has been removed for transportation of the machine.

If the adjustment is not carried out, the operating response will become poor. In addition, sand and soil will enter
the ball portion and cause damage or premature wear of the ball.
Adjust as follows.

Adjust with shims so that the play at the center ball is 0.2 - 0.7
mm (0.008 - 0.028 in).

1. Remove bolt (1), then loosen bolt (2).

2. Remove excess shims (3) (1 or 2 pieces), then tighten

bolts (1) and (2) temporarily.
3. Angle and tilt the blade.

q If the blade moves smoothly without making any

squeaking sound, the adjustment is complete.

q If there is a squeaking sound or the blade does not

move smoothly, add shims.

q If the play at the ball is still excessive, remove more

shims.

4. If the work equipment moves smoothly, tighten bolts (1)

and (2).

Tightening torque: 588 - 1030Nm (60 - 105kgm, 434-

759lbft)

Standard shim thickness (A): 6 - 8 mm (0.2 - 0.3 in)

Thickness of shims: 0.5 mm (0.02 in), 1.0 mm (0.04 in)

4-40
MAINTENANCE SERVICE PROCEDURE

LUBRICATING UNIVERSAL JOINT 4

WARNING
The undercover is heavy. Never try to open or close the cover when directly beneath it. When removing
bolts(2), carry out the work from the rear of the cover so that you can easily get out of the way.

1. Remove the undercover from the rear bottom of the

machine body as follows.
2. Remove two bolts (1) from the front side of the machine
body.

3. Holding the cover, remove two bolts (2) from the rear side
of the machine body.

4. Lower and open the cover gradually.

Weight of undercover: 21 kg (46 lb)

(A) Front of machine

(B) Dangerous place

5. Apply grease to the grease fittings (2 places) shown by

arrows.

4-41
SERVICE PROCEDURE MAINTENANCE

PROCEDURE FOR BLEEDING AIR IN HYDRAULIC SYSTEM 4

See “STARTING ENGINE (3-89)“.

Since the engine must be started and the blade must be operated, see OPERATION.

NOTICE
If the engine is run at high speed immediately after startup or a cylinder is pushed up to its stroke end, air
taken inside the cylinder may cause damage to the piston packing.

1. Bleeding air from cylinders

2. Run the engine at low idling, and extend and retract each
cylinder 4 to 5 times, taking care so that a cylinder may not
be brought up to its stroke end. (Stop the cylinder approx.
100 mm (3.9 in) short of its stroke end)

3. Next, operate each cylinder 3 to 4 times to the end of its

stroke.

4. Finally, operate each cylinder 4 to 5 times to the end of its

stroke to completely remove the air.

PROCEDURE FOR RELEASING INTERNAL PRESSURE OF HYDRAULIC SYSTEM 4

WARNING
q The hydraulic system is always under internal pressure, so when inspecting or replacing the piping or
hoses, always release the pressure in the circuit before starting. If the pressure is not released, high
pressure oil may spurt out and cause serious personal injury.

q The parts and oil are at high temperature after the engine is stopped, and may cause serious burns.
Wait for the temperature to go down before starting the operation.

q When the oil filler cap is removed, oil may spurt out, so turn the cap slowly to release the pressure
before removing the cap.

1. Stop the machine on firm level ground.

2. Lower the blade to the ground, then stop the engine.

3. After stopping the engine, operate the blade control lever

fully in all directions to release the internal pressure.

4. Loosen oil filler cap (F) at the top of the hydraulic tank
slowly to release the internal pressure.

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MAINTENANCE SERVICE PROCEDURE

CHECK BEFORE STARTING 4

For details of the following items, see “CHECK BEFORE STARTING (3-74)“ in the OPERATION section.

q Check coolant level, add coolant

q Check oil level in engine oil pan, add oil

q Check dust indicator

q Check, drain water separator

q Check oil level in power train case, add oil

q Check electric wiring

q Check KOMTRAX antena and cable

q Check brake pedal travel

q Checking with machine monitor

q Check fuel level, add fuel

q Check horn sound

q Check that lamps light up

q Check backup alarm sound

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SERVICE PROCEDURE MAINTENANCE

EVERY 50 HOURS SERVICE 4

DRAIN WATER, SEDIMENT FROM FUEL TANK 4

Carry out this check before operating the machine.

q Prepare a container to catch the fuel that is drained.

1. Open cover (1).

2. Open valve (2) at the bottom of the tank and drain the sed-
iment and water that has accumulated at the tank bottom
together with fuel.

When doing this, be careful not to get fuel on yourself.

3. When clean fuel comes out, close drain valve (2).

LUBRICATING 4

POWER ANGLE, POWER TILTDOZER

(1) Frame center ball (1 place)

4-44
MAINTENANCE SERVICE PROCEDURE

EVERY 250 HOURS SERVICE 4

Maintenance for every 50 hours service should be carried out at the same time.

LUBRICATING 4
1. Lower the blade to the ground, then stop the engine.

2. Using a grease pump, pump in grease through the grease fittings shown by arrows.

3. After greasing, wipe off any old grease that was pushed out.

POWER ANGLE, POWER TILTDOZER

(1) Lift cylinder bottom pin (2 places)

(2) Lift cylinder head pin (2 places)

(3) Angle cylinder bottom pin (2 places)

(4) Rod pin (2 places)

(5) Rod pin (2 places)

(6) Angle cylinder head pin (2 places)

(7) Tilt cylinder head pin (1 place)

(8) Tilt cylinder bottom pin (1 place)

(9) Frame mounting pin (2 places)

4-45
SERVICE PROCEDURE MAINTENANCE

POWER TILTDOZER

(1) Lift cylinder bottom pin (2 places)

(2) Lift cylinder head pin (2 places)

(3) Lift rod (4 places)

(4) Center brace ball joint (2 places)

(5) Tilt brace ball joint (1 place)

(6) Tilt brace thread (1 place)

(7) Lift lever mounting pin (4 places)

(8) Tilt cylinder ball joint (1 place)

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MAINTENANCE SERVICE PROCEDURE

GREASE EQUALIZER BAR SIDE PIN 4

Greasing points
Grease fitting (1): Front of carrier roller support on left side of
machine

Grease fitting (2): Rear of carrier roller support on right side of

machine

1. Remove all dirt from the top of the track frame and cover.

2. Clean the grease fitting, then supply grease to that fitting

with a grease pump.

REMARK
Supply 3 shots of grease (Operate the grease pump lever 3 times) to each grease fitting, and check that grease is
newly discharged through the seal lip.
If grease is not newly discharged through the lip, continue supplying grease until it is discharged.

GREASE EQUALIZER BAR CENTER PIN 4

(1 place)

1. Open the engine side cover on the left side of the chassis.

2. Clean the grease fitting indicated with the arrow, then sup-
ply grease to that fitting with a grease pump.

4-47
SERVICE PROCEDURE MAINTENANCE

CHECK OIL LEVEL IN FINAL DRIVE CASE, ADD OIL 4

WARNING
The parts and oil are at high temperature after the engine is stopped, and may cause serious burns. Wait
for the temperature to go down before starting the operation.

1. Remove oil level plug (1) and check whether the final drive
case is filled with oil to lower edge of the plug hole.
2. If the oil level is too low, add engine oil through the plug
hole until the oil overflows.

CHECK OIL LEVEL IN HYDRAULIC TANK, ADD OIL 4

WARNING
q The parts and oil are at high temperature immediately after the engine is stopped, and may cause
burns. Wait for the temperature to go down before starting the work.

q When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.

NOTICE
q Do not add oil if the level is above the H line. This will
damage the hydraulic equipment and cause the oil to
spurt out.

q Always lock the cap with the key.

1. Lower blade to the ground and stop the engine. Wait for 5
minutes before checking oil level. Oil level should be
between the H and L in sight gauge (G).

2. If the level is below the L mark, add oil through oil filler (F).

3. After adding oil, be sure to screw on the oil filler cap and
lock it with the key.

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MAINTENANCE SERVICE PROCEDURE

CHECK LEVEL OF BATTERY ELECTROLYTE 4

Perform this check before operating the machine.

WARNING
q Do not use the battery if the battery electrolyte level is below the LOWER LEVEL line. This will acceler-
ate deterioration of the inside of the battery and reduce the service life of the battery. In addition, it
may cause an explosion.

q The battery generates flammable gas and there is danger of explosion, so do not bring fire or sparks
near the battery.
q Battery electrolyte is dangerous. If it gets in your eyes or on your skin, wash it off with a large amount
of water and consult a doctor.

q When adding distilled water to the battery, do not allow the battery electrolyte to go above the UPPER
LEVEL line. If the electrolyte level is too high, it may leak and cause damage to the paint surface or
corrode other parts.

NOTICE
When adding distilled water in cold weather, add it before starting operations in the morning to prevent
the electrolyte from freezing.

Inspect the battery electrolyte level at least once a month and follow the basic safety procedures given below.

WHEN 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.

1. Open the battery cover on the left side of the machine body.

2. Use a wet cloth to clean the area around the electrolyte

level lines and check that the electrolyte level is between
the UPPER LEVEL (U.L.) and LOWER LEVEL (L.L.) lines.

If the battery is wiped with a dry cloth, static electricity may

cause a fire or explosion.

3. If the electrolyte level is below the midway point between

the UPPER LEVEL (U.L.) and LOWER LEVEL (L.L.) lines,
remove cap (1) and add distilled water to the U.L. line.

4. After adding distilled water, tighten cap (1) securely.

REMARK
If distilled water is added to above the UPPER LEVEL (U.L.)
line, use a syringe to lower the level to the UPPER LEVEL
(U.L.) line. Neutralize the removed fluid with baking soda
(sodium bicarbonate), then flush it away with a large amount of
water or consult your Komatsu distributor or battery maker.

4-49
SERVICE PROCEDURE MAINTENANCE

WHEN IT IS IMPOSSIBLE TO CHECK ELECTROLYTE LEVEL FROM SIDE OF BATTERY

If it is impossible to check the electrolyte level from the side of the battery, or there is no display of the UPPER
LEVEL line on the side of the battery, check as follows.

1. Open the battery cover on the left side of the machine body.

2. Remove cap (1) at the top of the battery, look through the
water filler port (2), and check the electrolyte surface. If the
electrolyte does not reach the sleeve (3), add distilled
water so that the level reaches the bottom of the sleeve
(UPPER LEVEL line) without fail.
q (A) Suitable level: Electrolyte level is up to bottom of
sleeve, so surface tension causes electrolyte surface
to bulge and poles appear bent.

q (B) Low: Electrolyte level is not up to bottom of sleeve,

so poles appear straight and not bent.

3. After adding distilled water, tighten cap (1) securely.

REMARK
If distilled water is added to above the bottom of the sleeve,
use a syringe to lower the level to the bottom of the sleeve.
Neutralize the removed fluid with baking soda (sodium bicar-
bonate), then flush it away with a large amount of water or con-
sult your Komatsu distributor or battery maker.

WHEN IT IS POSSIBLE TO USE INDICATOR TO CHECK ELECTROLYTE LEVEL

If it is possible to use and indicator to check the electrolyte level, follow the instructions given.

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MAINTENANCE SERVICE PROCEDURE

CLEAN WATER SEPARATOR STRAINER 4

WARNING
q The engine is at high temperature immediately after the machine has been operated. Wait for the
engine to cool down before replacing the filter.

q Do not bring fire or sparks near the fuel.

1. Open the inspection cover (1) on the rear of the machine

2. Prepare a container to catch the drained fuel and set it

under the water separator.

3. Set handle (2) to position (A) to stop fuel from flowing in.
4. Loosen plug (3).

5. Loosen drain valve (4) at the bottom of the water separator,

and drain the water and fuel into the container.

After draining, tighten plug (3).

6. Loosen ring nut (5), then remove cup (6).

7. Remove strainer (7) from the separator base.

REMARK
Be careful not to lose the O-ring, float, or spring. Be sure to
assemble them after washing.

8. Wash the interior of cup (6), strainer (7), spring (8), and
float (9) with clean fuel.
9. Check strainer (7) and replace it if it is damaged.

10. Clean the separator base and wash strainer (7), then install the strainer to the separator base.

11. Coat the threaded portion of ring nut (5) thinly with grease.

12. Fit spring (8) and float (9) in cup (6), fill with clean fuel, install separator base, then tighten with ring nut (5).

The specified tightening torque of ring nut (4): 37 to 43 N·m (3.8 to 4.4 kgf·m, 27.5 to 31.8 lbft)

If the ring is loose, it will cause leakage of fuel, so always tighten it to the specified torque.
13. Set handle (2) to position (B).

14. After washing the water separator, bleed the air from the fuel circuit. For details of the procedure for bleeding
the air, see “REPLACE FUEL FILTER CARTRIDGE (4-55)“.

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SERVICE PROCEDURE MAINTENANCE

CHECK BRAKE PERFORMANCE 4

WARNING
If the machine moves during the following operation, please contact your Komatsu distributor for repairs
immediately.

NOTICE
Do not place the gear shift lever in 1st under any circumstances. The machine will be damaged.

Before starting the engine, check that the area around the machine is safe, then do as follows.

1. Start the engine.

2. Set work equipment lock lever (1) to the FREE position (F)
then operate blade control lever (2) to raise the blade.

Leave the work equipment lock lever(1) to the FREE posi-

tion (F).

3. Set parking brake lever (3) to the FREE position (F).

4. Depress brake pedal (4), set steering, forward-reverse,

gear shift lever (5) in FORWARD, then press the shift up
button to enter 2nd speed.

5. Operate fuel control dial (6) and gradually raise the engine
speed to full throttle. (Keep the brake pedal depressed.)
6. Check that the machine does not move. This indicates that
brake performance is normal.

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MAINTENANCE SERVICE PROCEDURE

CHECK AIR CONDITIONER COMPRESSOR BELT TENSION, ADJUST 4

(Machines equipped with cab)

If the belt is loose, it will slip and the cooling effect will be reduced.
When the belt is new, there will be initial elongation, so always adjust again after 2 or 3 days.

CHECKING

1. Open the engine side cover on the right side of the chassis.

2. Press a point midway between the drive pulley (1) and

compressor pulley (2) with your finger (approx. 98 N (10
kgf)) and check that the tension is 15 to 18 mm (0.59 to
0.71 in).

ADJUSTING

1. Open the engine side cover on the left side of the chassis.

2. Loosen 4 bolts (3) and locknut (4).

3. Turn adjustment bolt (5) to move compressor (6) so that

deflection (A) of the belt is 15 - 18 mm (0.6 - 0.7 in) (at a
finger force of approx. 98 N (10 kg)).

4. After adjusting, tighten bolts (3) and locknut (4)

NOTICE
q Check each pulley for damage, wear of the V-groove, and wear of the V-belt. In particular, be sure to
check that the V-belt is not touching the bottom of the V-groove.

q In case any of the following occurs, ask the Komatsu distributor in your territory to replace the belts
with new ones.
● The fan belt has elongated, leaving little allowance for adjustment.
● A cut or crack is found on the belt.
● Slipping or creaking sound is heard coming from the belt.

q When the new V-belt is set, readjust it after one hour of operation.

4-53
SERVICE PROCEDURE MAINTENANCE

CLEAN AIR CONDITIONER AIR FILTER (FRESH/RECIRC FILTER) 4

(Machines equipped with cab)

Clean the air conditioner air filter if it becomes clogged or if there is dirt or oil stuck to it.
In places where there is a lot of dust, clean the air filter once a week. In addition, clean the air conditioner air filter
at the same time, when cleaning the engine air cleaner.

1. Loosen mounting bolts (1), pull up inspection cover (2) to

the rear, and remove it.
2. Remove inside cover (3), then remove FRESH filter (4).

3. Remove the filter box, then brush out the dirt accumulated
inside the box through the cleaning hole (5) in the hood.

When doing this, be careful not to let any dirt or dust get
into the fresh air intake port (6) leading to the cab.

4. Open inspection cover (7) under the front panel, then pull
up RECIRC filter (8) and remove it.

5. Clean filters(4) and (8) with compressed air.

If the filters are stained with oil or extremely dirty, wash

them in neutral detergent.

After washing the filters, dry them up, then install them.

REMARK
If the filters cannot be cleaned with air or in water, replace them
with new ones.

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MAINTENANCE SERVICE PROCEDURE

EVERY 500 HOURS SERVICE 4

Maintenance for every 50 and 250 hours service should be carried out at the same time.

REPLACE FUEL FILTER CARTRIDGE 4

WARNING
q The engine is at high temperature immediately after the machine has been operated. Wait for the
engine to cool down before replacing the filter.

q Do not bring fire or sparks near the fuel.

Prepare a filter wrench and a container to catch the fuel.

1. Open the engine side cover on the left side of the chassis.
2. Set the container to catch the fuel under the filter cartridge.

3. Using a filter wrench, turn filter cartridge (1) counterclock-

wise to remove it.

4. Clean the filter holder, fill a new filter cartridge with clean
fuel, coat the packing surface with engine oil, then install it
to the filter holder.
5. When installing, tighten until the packing surface contacts
the seal surface of the filter holder, then tighten it up 1/2 to
3/4 of a turn.

If the filter cartridge is tightened too far, the packing will be

damaged and this will lead to leakage of fuel. If the filter
cartridge is too loose, fuel will also leak from the packing,
so always tighten to the correct amount.

6. Remove cover (2).

7. Loosen the knob of feed pump (3) and operate it 50 to 60

times up and down. This will bleed the air.

8. Push in the knob of feed pump (3) and tighten it.

9. After replacing the filter cartridge, start the engine and check that there is no leakage of fuel from the filter seal
surface. If there is any leakage of fuel, check the tightening of the filter cartridge. Whenever there is leakage of
fuel, follow Steps 1 and 2 to remove the filter cartridge, then check the packing surface for damage or foreign
material.

If any damage or foreign material is found in the packing, replace the packing with a new part, then repeat
Steps 3 to 6 to install the filter cartridge.

4-55
SERVICE PROCEDURE MAINTENANCE

CHANGE OIL IN ENGINE OIL PAN, REPLACE ENGINE OIL FILTER CARTRIDGE 4

WARNING
Parts and oil are at high temperature immediately after the engine is stopped and may cause serious
burns. Wait for the oil temperature to go down before performing this operation.

q Refill capacity: 19 liters (5.02 US gal)

q Prepare a socket wrench and filter wrench.

1. Remove inspection cover (1) at the front of the machine.

2. Set a container under the drain hose to catch the oil, then
loosen drain valve (P) slowly and drain the oil. When doing
this, be careful not to get oil over yourself.

3. Check the drained oil, and if there are excessive metal par-
ticles or foreign material, please contact your Komatsu dis-
tributor.

4. Tighten drain valve (P).

5. Open the engine side cover on the right side of the

machine body, and remove filter cover (2) from the lower
section.

6. Using a filter wrench, turn filter cartridge (3) counterclock-

wise to remove it.

7. Clean the filter holder, fill the new filter cartridge with clean oil, coat the thread and packing portion of the new
filter cartridge with oil (or coat thinly with grease), then install.

8. When installing the filter cartridge, bring the packing surface into contact with the filter holder, then tighten a
further 3/4 to 1 turn.

9. After replacing the filter cartridge, add engine oil through oil
filler port (F) so that the oil level is between the MAX and
MIN marks on dipstick (G).

10. Run the engine at idling for a short time, then stop the
engine, and check that the oil level is between the H and L
marks on the dipstick. For details, see “CHECK OIL LEVEL
IN ENGINE OIL PAN, ADD OIL (3-75)“.

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MAINTENANCE SERVICE PROCEDURE

REPLACE CORROSION RESISTOR CARTRIDGE 4

1. Open the engine side cover on the right side of the

machine body, and remove filter cover (1) from the lower
section.

2. Screw in valve (2) at the top of the corrosion resistor.

3. Using the filter wrench, turn cartridge (3) counterclockwise

to remove it.

4. Apply engine oil to the sealing surface of a new cartridge,

then install it to the filter holder.

5. When installing, screw in cartridge until seal comes in contact with sealing surface, then tighten approx. 2/3
turn.

6. Open valve (1).

Use Komatsu genuine cartridge.

REPLACE POWER TRAIN OIL FILTER ELEMENT 4

WARNING
The parts and oil are at high temperature after the engine is stopped, and may cause serious burns. Wait
for the temperature to go down before starting the operation.

1. Open cover on the right side of the machine.

2. Remove mounting bolts (2) of filter (1), then remove cover

(3).

3. Remove the cover (4) under the fender, loosen drain plug
(P), and drain the oil inside the filter case.

4. Take out element (5).

5. Clean the removed parts and the inside of the case, then
install a new element.

Use Komatsu genuine element.

6. Set so that the side hole of cover (3) is in the direction to

match hole (A) of filter case (1), then tighten with bolts (2).
7. Install drain plug (P).

8. Loosen air bleed plug (6), start the engine, and when oil
spurts out, tighten the plug.

9. Close the cover at right side of machine.

4-57
SERVICE PROCEDURE MAINTENANCE

EVERY 1000 HOURS SERVICE 4

Maintenance for every 50, 250 and 500 hours should be carried out at the same time.

CHANGE OIL IN POWER TRAIN CASE, CLEAN STRAINERS (POWER TRAIN STRAINER,
SCAVENGING PUMP STRAINER) 4

WARNING
q The oil is at high temperature immediately after the machine has been operated. Wait for the oil to cool
down before starting the operation.

q The undercover is heavy. Never try to open or close the cover when directly beneath it. When remov-
ing bolts(2), carry out the work from the rear of the cover so that you can easily get out of the way.

q Refill, capacity: 69 liters (18.22 US gal)

1. Loosen drain plug (P) (with a slit), drain the oil, then tighten
drain plug (P) again.

Do not remove drain plug (P).

2. Remove the undercover from the rear bottom of the

machine body as follows.

3. Remove two bolts (1) from the front side of the machine
body.

4. Holding the cover, remove two bolts (2) from the rear side
of the machine body.

5. Lower and open the cover gradually.

Weight of undercover: 21 kg (46 lb)

(A) Front of machine

(B) Dangerous place

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MAINTENANCE SERVICE PROCEDURE

6. Loosen mounting bolt (3) of the power train strainer, then

remove cover (4).
7. Take out spring (5), then take out strainer (6).

8. Remove all dirt from strainer (6), then wash in clean diesel
oil or flushing oil. Clean the case interior and the removed
parts.

9. Loosen mounting bolt (7) of the scavenging pump strainer,

then remove cover (8).

10. Take out spring (9), then take out strainer (10).

11. Remove all dirt from strainer (10), then wash in clean die-
sel oil or flushing oil. Clean the case interior and the
removed parts.

If the spring or strainer are damaged, replace them.

12. Install the strainers to their original position.

13. After installing, replace the element in the power train oil filter. For details, see “REPLACE POWER TRAIN OIL
FILTER ELEMENT (4-57)“.

14. Open cover on the right side of the machine.

15. Refill the specified quantity of oil through oil filler (F).

16. Check that the oil is at the specified level. For details, see
“CHECK OIL LEVEL IN POWER TRAIN CASE, ADD OIL
(3-77)“.
17. Close the cover at right side of machine.

4-59
SERVICE PROCEDURE MAINTENANCE

CHECK OIL LEVEL IN DAMPER CASE, ADD OIL 4

WARNING
q The oil is at high temperature immediately after the
machine has been operated. Wait for the oil to cool
down before starting the operation.

q The undercover is heavy. Never try to open or close

the cover when directly beneath it. When removing
bolts(2), carry out the work from the rear of the cover
so that you can easily get out of the way.

If the quantity of the oil in the damper is insufficient, the damper may be seized. Accordingly, check, and add or
replace the oil according to the following procedure.

1. Remove the undercover from the rear bottom of the

machine body as follows.
2. Remove two bolts (1) from the front side of the machine
body.

3. Holding the cover, remove two bolts (2) from the rear side
of the machine body.

4. Lower and open the cover gradually.

(A) Front of machine

(B) Dangerous place

5. Remove oil level plug (3) and check the oil level. The
proper oil level is the bottom edge of the plug hole.

Tighten plug (3).

REMARK
Check the oil level while the engine is stopped.
If the machine is inclined, set it in a level position before check-
ing the oil level.

6. If the oil level is below the bottom edge of the plug hole,
remove oil filler plug (4) and add new oil.

Add new oil until the oil level reaches the bottom edge of oil
level plug (3).

7. After adding the oil, tighten plugs (3) and (4).

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MAINTENANCE SERVICE PROCEDURE

CHANGE OIL IN FINAL DRIVE CASE 4

WARNING
The oil is at high temperature immediately after the machine has been operated. Wait for the oil to cool
down before starting the operation.

q Refill capacity

D61EX: (each) 24 liters (6.34 US gal)

D61PX: (each) 27 liters (7.13 US gal)

1. Remove oil level plug (1) , then remove drain plugs (2), and
drain the oil. After draining the oil, tighten the plugs.
2. Add engine oil to the refill level through the hole in oil level
plug (1).

3. Check that the oil is at the specified level. For details, see
“CHECK OIL LEVEL IN FINAL DRIVE CASE, ADD OIL (4-
48)“.

CLEAN BREATHER 4

1. Open cover (1).

2. Remove the breather (2) and wash out dust remaining

inside with diesel oil and flushing oil.

4-61
SERVICE PROCEDURE MAINTENANCE

CHECK ALL TIGHTENING PARTS OF TURBOCHARGER 4

Contact your Komatsu distributor to have the tightening portions checked.

CHECK PLAY OF TURBOCHARGER ROTOR 4

Contact your Komatsu distributor to have the rotor play checked.

CHECK FOR LOOSE ROPS MOUNT BOLTS 4

Check that the bolts are not loose and that there is no damage.
If any bolt is loose, tighten it to the following torque.

If there is any damage, replace the bolt with a genuine Komatsu part.

Tightening torque: 785 to 980 N·m (80 to 100 kgf·m, 578.6 to 723.3 lbft)

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MAINTENANCE SERVICE PROCEDURE

EVERY 2000 HOURS SERVICE 4

Maintenance for every 50, 250, 500 and 1000 hours service should be carried out at the same time.

CHANGE OIL IN HYDRAULIC TANK, REPLACE OIL FILTER ELEMENT 4

WARNING
q The parts and oil are at high temperature immediately after the engine is stopped, and may cause
burns. Wait for the temperature to go down before starting the work.

q When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.

q Refill capacity: 44 liters (11.62 US gal)

1. Lower the work equipment to the ground, then stop the

engine.

2. Turn the cap of oil filler (F) slowly to release the internal
pressure, then remove the cap.

3. Remove the cover (1) at the bottom of the hydraulic tank.

4. Loosen drain valve (2), drain the oil, tighten drain valve (2)
again, then install cover (1). When loosening drain valve
(2), be careful not to get oil on yourself.

5. Remove bolt (3), then remove cover (4).

6. Take out spring (5), valve (6), and element (7).

7. Clean the inside of the case, then wash spring (5) and
valve (6).
8. Install new element (7), valve (6), and spring (5).

9. Install cover (4) with bolt (3).

10. Refill the specified quantity of oil through oil filler (F).
11. Check that the oil is at the specified level. For details, see
“CHECK OIL LEVEL IN HYDRAULIC TANK, ADD OIL (4-
48)“.

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SERVICE PROCEDURE MAINTENANCE

REPLACE HYDRAULIC TANK BREATHER ELEMENT 4

WARNING
q The parts and oil are at high temperature immediately after the engine is stopped, and may cause
burns. Wait for the temperature to go down before starting the work.

q When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.

1. Remove the cap of oil filler (F) at the top of the hydraulic
tank.

2. Replace element (1) inside the cap.

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MAINTENANCE SERVICE PROCEDURE

CHANGE OIL IN DAMPER CASE 4

WARNING
q The parts and oil is very hot just after the operation.
Wait until the oil temperature drops, then start the
work.

q The undercover is heavy. Never try to open or close

the cover when directly beneath it. When removing
bolts(2), carry out the work from the rear of the cover
so that you can easily get out of the way.

q When removing drain plug (5) of the damper case, take

care not to get oil over yourself.

q Quantity of replacement oil: 1.3 liters (0.34 US gal)

1. Remove the undercover from the rear bottom of the

machine body as follows.

2. Remove two bolts (1) from the front side of the machine
body.

3. Holding the cover, remove two bolts (2) from the rear side
of the machine body.
4. Lower and open the cover gradually.

Weight of undercover: 21 kg (46 lb)

(A) Front of machine

(B) Dangerous place

5. Remove oil level plug (3) and oil filler plug (4), then remove
drain plug 5 to drain the oil. After the all oil is drained,
tighten plug (5).

6. Add oil through the hole of oil filler plug (4) until the oil level
reaches the bottom edge of the hole of oil level plug (3).

7. After refilling the oil, tighten plugs (3) and (4).

4-65
SERVICE PROCEDURE MAINTENANCE

CLEAN, CHECK TURBOCHARGER 4

Contact your Komatsu distributor for cleaning and inspection.

CHECK VIBRATION DAMPER 4

Check that there are no cracks or peeling in the outside surface of the rubber.

If any cracks or peeling are found, contact your Komatsu distributor to have the parts replaced.

CHECK ALTERNATOR, STARTING MOTOR 4

The brushes mat be worn or the bearing may have run out of grease, contact your Komatsu distributor for inspec-
tion and repairs.

If the engine is started frequently, have this inspection carried out every 1000 hours.

CHECK ENGINE VALVE CLEARANCE, ADJUST 4

Special tools are needed for inspection and maintenance, please contact your Komatsu distributor.

4-66
MAINTENANCE SERVICE PROCEDURE

EVERY 4000 HOURS SERVICE 4

Maintenance for every 50, 250, 500, 1000 and 2000 hours service should be carried out at the same time.

CHECK WATER PUMP 4

Check that there is no play in the pulley, leakage of oil or water, or clogging of the drain hole. If any abnormality is
found, please contact your Komatsu distributor for repairs or replacement.

4-67
SERVICE PROCEDURE MAINTENANCE

4-68
SPECIFICATIONS

15
SPECIFICATIONS SPECIFICATIONS

SPECIFICATIONS 5
Power angle power tiltdozer, ROPS guard, cab, air conditioner

Item Unit D61EX-15 D61PX-15

Machine weight kg (lb) 16,840 (37,132) 18,460 (40,704)
Name of engine - Komatsu SA6D114E-2 diesel engine
Engine horsepower kW(HP)/rpm 116(155)/1,800
A Overall length mm (ft in) 5,030 (16'6“) 5,465 (17'11“)
B Overall height mm (ft in) 3,150 (10'4“) 3,180 (10'5“)
C Overall width mm (ft in) 3,275 (10'9“) 3,860 (12'8“)
Forward km/h (MPH) 3.3/5.8/9.4 (2.1/3.6/5.8)
Travel speed (1st/2nd/3rd)
Reverse km/h (MPH) 4.3/7.3/11.2 (2.7/4.5/7.0)

5-2
ATTACHMENTS, OPTIONS

16
GENERAL PRECAUTIONS ATTACHMENTS, OPTIONS

GENERAL PRECAUTIONS 6

PRECAUTIONS RELATED TO SAFETY 6

If attachments or options other than those authorized by Komatsu are installed, this will not only affect the life of
the machine, but will also cause problems with safety.

When installing attachments not listed in this Operation and Maintenance Manual, contact your Komatsu distribu-
tor first.

If you do not contact Komatsu, we cannot accept any responsibility for any accidents or failures.

WARNING
General precautions
Read the instruction manual for the attachment carefully, and do not use the machine before you under-
stand the operation method completely.
If you lose the instruction manual, be sure to order another copy from your Komatsu distributor.
To prevent serious personal injury caused by misoperation, place your foot on the pedal only when oper-
ating the pedal.
Precautions for removal and installation
When removing or installing an attachment, observe the following items and work safely.
Select a firm, level surface when installing or removing an attachment.
When working in cooperation with one or more other workers, decide signs and observe them when carry-
ing out the operation.
When carrying a heavy part (25 kg (55 lb) or more), use a crane.
When removing a heavy part, always place a support in position before removing it.
When lifting a load with a crane, be particularly careful of the center of gravity.
It is dangerous to carry out operations when the load has been raised by a crane. Always lower the load
onto a stand and check that it is safe.
When leaving an attachment removed or installing it, place it in a stable position to prevent it from falling
over.
Never go under a load raised by a crane.
Always stand in a place which is safe even if the load should fall.

NOTICE
Qualifications are required to operate a crane. Never allow the crane to be operated by an unqualified per-
son.
For details of removal and installation operations, contact your Komatsu distributor.

6-2
ATTACHMENTS, OPTIONS HANDLING HYDRAULIC RIPPER

HANDLING HYDRAULIC RIPPER 6

q This ripper is applicable for the D61EX.

q When installing it to the D61PX, change the track shoes to 600 mm (23.6 in) narrow single shoes. If the ripper
is operated on a machine equipped with wider track shoes, there is danger that the ripper will damage the
undercarriage.

GENERAL VIEW 6

(1) Hydraulic cylider (4) Shank

(2) Link (5) Point
(3) Beam (6) Support

6-3
HANDLING HYDRAULIC RIPPER ATTACHMENTS, OPTIONS

EXPLANATION OF COMPONENTS 6
RIPPER CONTROL LEVER

WARNING
When carrying out inspection or maintenance of the machine, or when parking the machine, lower the rip-
per to the ground and set the work equipment lock lever to the LOCK position.

This lever is used to operate the ripper.

(A) RAISE: Ripper goes up

(B) HOLD: Ripper is stopped and held in the same position.

(C) LOWER: Ripper goes down

REMARK
If the work equipment lock lever is set to LOCK position (L), the
operation of the ripper is locked.
For details of the operation of the work equipment lock lever,
see “WORK EQUIPMENT LOCK LEVER (3-37)“.

6-4
ATTACHMENTS, OPTIONS HANDLING HYDRAULIC RIPPER

OPERATION 6

CHECK BEFORE STARTING ENGINE, ADJUST 6

WALK-AROUND CHECK

1. Check for wear of the point at the tip of the shank, check the mounting condition, and check for damage to the
rivets. If any abnormality is found, replace or repair.

PRECAUTIONS WHEN OPERATING 6

q Travel in low speed and lower the ripper gradually when starting to move the machine off. When the optimum
digging depth is reached, move the control lever to the HOLD position.

Do not dig the shank in deep when starting digging operations.

q During ripping operations, never turn the machine suddenly or travel in reverse. When turning the machine
suddenly or traveling in reverse, raise the shank from the ground surface.

q When carrying out digging operations with only one shank, always use the center shank. Remove both side
shanks.

q When starting to travel up a steep slope or when reaching the bottom of the slope, the point may touch the
ground. On hard ground, there is danger of the point breaking if it touches the ground, so raise the shank to
the maximum height.

ADJUSTING POSTURE OF WORK EQUIPMENT 6

ADJUSTMENT OF DIGGING DEPTH

There are mounting holes for the pin in the shank. Select the mounting hole to match the digging depth.

Pin hole Max. digging

Use
position depth
When there is special need to
(A) 595mm (23.4 in)
dig deeply
(B) Normal 485mm (21.9 in)
(C) When not using ripper -

6-5
HANDLING HYDRAULIC RIPPER ATTACHMENTS, OPTIONS

When changing the digging depth, do as follows.

1. Remove cotter pin (1).

2. Remove pin (2), change the position of the shank hole,

then insert pin (2).

3. Insert cotter pin (1).

ADJUSTING DIGGING ANGLE

Adjust the position of the mounting pin hole in the beam and
upper link.

q Digging angle

Position (1): 45°

Position (2): 55°

The pin is locked with lock plate (3).

REPLACEMENT OF POINT

A point is installed to protect the shank. If the point is worn,

replace it as follows.

1. Put a pin remover in contact with the pin marked by the

arrow and tap with a hammer to remove.

2. Replace the point.

3. Insert the pin half way, then knock it in fully with a hammer.

6-6
ATTACHMENTS, OPTIONS HANDLING HYDRAULIC RIPPER

TROUBLESHOOTING 6

OTHER TROUBLE 6
q ( ): Always contact your Komatsu distributor when dealing with these items.

q In cases of problem or causes which are not listed below, contact your Komatsu distributor for repairs.

Problem Main causes Remedy

Slow ripper raising and function, •Add oil to specified level, see
lack of ripping force EVERY 250 HOURS SERVICE
•Improper hydraulic oil
(•Check, repair)
(•Check, repair)
•Defective pump
•Defective adjustment of relief valve
(•Check, repair)
•Defective control valve, safety valve
•Defective valve spool
•Defective piston ring, packing, valve
(•Check, repair)
•Clogging inside piping
(•Check, repair)
Cylinder lacks holding power •Tighten
•Leakage of oil from piping, hose
(•Replace)
•Defective piston ring, packing
(•Check, repair)
•Defective piston valve
(•Check, repair)
•Defective valve spool
(•Check, repair)
•Defective safety valve, suction valve
Oil pressure does not rise (•Repair)
•Clogging inside piping
(•Check, adjust)
•Defective adjustment of relief valve

6-7
HANDLING HYDRAULIC RIPPER ATTACHMENTS, OPTIONS

MAINTENANCE 6

EVERY 250 HOURS SERVICE 6

LUBRICATING

1. Lower the ripper to the ground and stop the engine.

2. Using a grease pump, pump in grease through the grease fittings shown by arrows.

3. After greasing, wipe off any old grease that was pushed out.

(1) Ripper cylinder foot pin (1 place)

(2) Ripper cylinder rod end pin (1 place)

(3) Link pin (8 places)

CHECK OIL LEVEL IN HYDRAULIC TANK, ADD OIL

1. Stop the machine on level ground.

Set the blade perpendicular and lower it the ground, lower the ripper to the ground, then stop the engine.

2. For details of checking the oil level in the hydraulic tank, see “CHECK OIL LEVEL IN HYDRAULIC TANK, ADD
OIL (4-48)“.

SPECIFICATIONS 6
q Power angle, power tilt dozer

Item Unit D61EX-15

Operating weight
kg (lb) 17,670 (38,962)
(not including operator)
Weight of ripper as individ-
kg (lb) 1,610 (3,550)
ual part
A Overall length mm(ft in) 6,285 (20'7“)
No. of shanks 3

6-8
ATTACHMENTS, OPTIONS AIR SUSPENSION SEAT

AIR SUSPENSION SEAT 6

ADJUSTMENT 6

WARNING
When adjusting the position of the operator's seat, always set the work equipment lock lever to the LOCK
position to prevent any accidental contact with the control levers.

q Always adjust the operator's seat before starting each operation or when the operators change shift.

q When adjusting the seat, put your back against the backrest and adjust to a position where the brake pedal
can be fully depressed.

NOTICE
There is danger of damage to the air compressor, so do not keep lever (3) operated continuously for more
than 1 minute.

Adjustments (C), (D), and (I) use the air compressor built into the seat, so turn the engine starting switch to the ON
position when carrying out the adjustment.

(A) Fore-and-aft adjustment

Pull lever (1), set the seat to a position where it is easy to oper-
ate, then release the lever.

Fore-aft adjustment: 170 mm (6.7 in) (17 stages)

(B) Adjusting seat angle

Move lever (2) up, move the seat cushion at the front up or
down to set to the desired position, then release the lever.

Amount of adjustment

Forward tilt: 3 degrees

Rear tilt: 11 degrees

6-9
AIR SUSPENSION SEAT ATTACHMENTS, OPTIONS

(C) Adjusting seat height

The seat height adjustment uses an air system, and it can be

adjusted steplessly.

When adjusting the height, pull lever (3) up fully or push it down
fully (when pulling it up, pull it until a click is felt). When the
seat is set at the desired height, release the lever. If the lever
is kept pulled up, the position where the seat does not rise any
further is the maximum height. When the seat reaches the
maximum height, the suspension automatically goes down
slightly to secure the amount of movement of the lever.

If the operator raises his body from the seat or changes the amount of weight applied to the seat during adjust-
ment, the air in the suspension may be discharged.

Amount of adjustment: 80 mm (3.2 in)

(D) Setting seat for weight

Pull lever (3) up fully (pull it until a click can be felt). When the lever is released, the weight adjustment is carried
out automatically. To ensure that the weight adjustment is carried out correctly, the operator should sit in the nor-
mal operating position when operating the lever. If the operator raises his body from the seat or changes the
amount of weight applied to the seat during adjustment, the air in the suspension may be discharged.

When operators change shifts, the new operator should pull lever (3) up fully (pull it until a click it is felt). When the
lever is released, the weight adjustment is carried out automatically.

If lever (3) is pulled lightly, the weight adjustment starts, but always pull the lever up fully (pull it until a click is felt)
before releasing it.

(E) Fore-and-aft adjustment of seat cushion

Operate lever (4) up, set the seat cushion to the desired position, then release the lever.

Fore-and-aft adjustment: 60 mm (2.4 in)

(F) Adjusting reclining angle

Move lever (5) up and move the backrest to the front or rear.

Push your back against the backrest when carrying out this adjustment. If your back is not pressing against the
backrest, the backrest may suddenly spring forward.

Amount of adjustment

Forward tilt: 20 degrees (over 20 degrees is free)

Rear tilt: 60 degrees

REMARK
The seat can be reclined more when the seat is pushed to the front. The amount of reclining decreases as the seat
is pushed back, so when moving the seat back, return the seatback to the upright position.

NOTICE
If the seat back is reclined too far, the seat back may hit the rear glass, so use it in a position where it does
not contact the glass.

6-10
ATTACHMENTS, OPTIONS AIR SUSPENSION SEAT

(G) Adjusting headrest angle

Rotate the backrest to the front or rear and set to the desired angle.

Amount of adjustment: 38 degrees

(H) Adjusting headrest height

Move the headrest up or down and set to the desired height.

Amount of adjustment: 100 mm (3.9 in)

(I) Lumbar support

Operate switch (6) to give a suitable tension to the lumbar region.

When + is pressed: Tension becomes stronger

When - is pressed: Tension becomes weaker

6-11
DELUXE SEAT ATTACHMENTS, OPTIONS

DELUXE SEAT 6
(Rotating seat)

ADJUSTMENT 6

WARNING
When adjusting the position of the operator's seat, always set the work equipment lock lever to the LOCK
position to prevent any accidental contact with the control levers.

q Always adjust the operator's seat before starting each operation or when the operators change shift.
q When adjusting the seat, put your back against the backrest and adjust to a position where the brake pedal
can be fully depressed.

(A) Fore-and-aft adjustment

Pull lever (1), set the seat to a position where it is easy to oper-
ate, then release the lever.

Fore-aft adjustment: 160 mm (6.3 in) (8 stages)

(B) Weight adjustment of seat

Turn knob (2) under the seat to match the weight adjustment
scale with your own weight.
The weight can be adjusted within a range of 50 to 120 kg (110
to 265 lb)

If you want to make the seat softer, turn the weight adjustment to a lower weight; if you want to make the seat
harder, adjust to a higher weight.When operating on uneven surfaces, adjust the seat to a harder setting.

(C) Adjust reclining angle

NOTICE
When reclining the seat back to the rear, check the space behind, and adjust to a suitable position.

Pull lever (3), set the seatback to a position where it is easy to operate, then release the lever.

6-12
ATTACHMENTS, OPTIONS DELUXE SEAT

(D) Height adjustment of seat

q Turn lever (4) to adjust the height of the seat.

q If the lever is turned clockwise, the seat is heightened. If the former is turn counterclockwise, the latter is low-
ered.

If you apply your weight to the seat, the lever becomes heavy. Accordingly, do not apply your weight.

After adjusting the height, release the lever to lock the seat.

(Height adjustment distance: Stepless, 50 mm (2.0 in))

(E) Adjusting direction of seat

Pull up lever (5) to unlock the seat, and the seat can be turned by hand to the position of 15° on the right.

After changing the direction of the seat, return the lever securely to lock the seat.

q Change the direction of the seat to the right for the ease of operation of the ripper.

6-13
HEADREST ATTACHMENTS, OPTIONS

HEADREST 6

Removal of headrest

Pull up the headrest.

REMARK
The headrest cannot be fixed to halfway.

6-14
ATTACHMENTS, OPTIONS EQUIPPING FIRE EXTINGUISHER AND FIRST-AID KIT

EQUIPPING FIRE EXTINGUISHER AND FIRST-AID KIT 6

Equipping the fire extinguisher and the first-aid kit at the illustrated position needs brackets (if equipped).

The fire extinguisher and the first-aid kit can be installed to the positions shown in the following illustration.

(1) First-aid kit

(2) Fire extinguisher

For parts that are required to install them in your machine,

please contact your distributor.

6-15
EQUIPPING FIRE EXTINGUISHER AND FIRST-AID KIT ATTACHMENTS, OPTIONS

6-16
INDEX

INDEX
1

<A> GUIDE TO MAINTENANCE .................................. 4-2

ACCUMULATOR, HANDLING............................. 3-69
ADUSTING POSTURE OF WORK EQUIPMENT.... 3-
112 <H>
AIR CONDITIONER, HANDLING ........................ 3-63 HANDLING HYDRAULIC RIPPER ........................ 6-3
GENERAL LOCATIONS AND FUNCTION OF EXPLANATION OF COMPONENTS ................ 6-4
CONTROL PANEL .......................................... 3-63 GENERAL VIEW............................................... 6-3
METHOD OF OPERATION............................. 3-66 MAINTENANCE ................................................ 6-8
AIR SUSPENSION SEAT ...................................... 6-9 OPERATION ..................................................... 6-5
ASHTRAY ............................................................ 3-53 SPECIFICATIONS ............................................ 6-8
TROUBLESHOOTING ...................................... 6-7
HEADREST ......................................................... 6-14
<C>
CAP, COVER WITH LOCK .................................. 3-50
CAR STEREO, HANDLING ................................. 3-54 <I>
CHECK AFTER FINISHING WORK .................. 3-115 INTRODUCTION ................................................... 1-7
CHECK BEFORE STARTING ENGINE, ADJUST... 3-
72
CIRCUIT BREAKER ............................................ 3-44
COLD WEATHER OPERATION ........................ 3-128
AFTER COLD WEATHER............................. 3-130
AFTER COMPLETION OF WORK................ 3-130 <L>
PRECAUTIONS FOR LOW TEMPER........... 3-128 LIFTING MACHINE ........................................... 3-124
CONTROL LEVERS AND PEDALS..................... 3-37 LOADING, UNLOADING WORK ....................... 3-120
LOCKING........................................................... 3-116
LONG-TERM STORAGE................................... 3-131
<D>
AFTER STPRAGE ........................................ 3-131
DELUXE SEAT .................................................... 6-12
BEFORE STORAGE..................................... 3-131
DOOR - OPEN LOCK .......................................... 3-49
DURING STORAGE ..................................... 3-131
DOOR POCKET................................................... 3-52

<M>
<E>
MACHINE OPERATION ...................................... 3-98
ELECTRIC POWER TAKE-OUT ADAPTER........ 3-48
MAINTENANCE SCHEDURE CHART ................ 4-17
EMISSION CONTROL INFORMATION LABEL..... 1-9
MAINTENANCE SCHEDURE CHART ........... 4-17
ENGINE SERIAL NO. PLATE................................ 1-8
EQUIPPING FIRE EXTINGUISHER AND FIRST-AID
KIT ................................................................... 6-15 <N>
EXPLANATION OF COMPONENTS ..................... 3-6 NECESSARY INFORMATION .............................. 1-8

<F> <O>
FORWORD ............................................................ 1-2 OPENING AND CLOSING ENGINE SIDE COVER 3-
FRONT PANEL ...................................................... 3-6 52
FRONT/REAR, LEFT/RIGHT DIRECTIONS OF OPERATION........................................................ 3-72
MACHINE .......................................................... 1-7 OPERATIONS AND CHECKS AFTER STARTING
FUSE.................................................................... 3-45 ENGINE .......................................................... 3-94
FUSIBLE LINK ..................................................... 3-47 OUTLINE OF OIL, FUEL, COOLANT, AND
PERFORMING OIL CLINIC .............................. 4-5
OUTLINE OF SERVICE ........................................ 4-5
<G>
GENERAL PRECAUTIONS .............................2-9,6-2
PRECAUTIONS RELATED TO SAFETY .......... 6-2 <P>
GENERAL VIEW.................................................... 3-2 PARKING MACHINE ......................................... 3-114
GENERAL VIEW OF CO ....................................... 3-3
GENERAL VIEW OF MACHINE ............................ 3-2

7-1
 INDEX

PERIODIC REPLACEMENT OF SAFETY CRITICAL MACHINE TOWING METHOD ..................... 3-132

PARTS.............................................................4-15 OTHER TROUBLE........................................ 3-142
POSITION OF SERVICE METER..........................1-9 TRQUE LIST........................................................ 4-14
PRECAUTIONS FOR MAINTENANCE ...............2-27
PRECAUTIONS FOR OPERATION ..........2-18,3-108
BATTERY ........................................................2-24 <U>
OPERATION ...................................................2-20 USE OF FUEL, COOLANT AND LUBRICANTS
STARTING ENGINE........................................2-18 ACCORDING TO AMBIENT TEMPERATURE4-10
TOWING ..........................................................2-26 PROPER SELECTION OF FUEL, COOLANT AND
TRANSPORTATION .......................................2-23 LUBRICANTS ................................................. 4-10
PRECAUTIONS WHEN REMOVING ROPS .....3-119
PRECAUTIONS WHEN REMOVING WORK
EQUIPMENT .................................................3-118 <W>
PRODUCT IDENTIFICATION NUMBER (PIN)/ WEAR PART LIST ................................................. 4-9
MACHINE SERIAL NO. PLATE ........................1-8 WEAR PARTS LIST .............................................. 4-9
WORK POSSIBLE USING BULLDOZER .......... 3-110

<R>
RELATING TO ELECTRIC SYSTEM.....................4-8
REMOVING CAB ...............................................3-118

<S>
SAFETY .................................................................2-2
SAFETY CRITICAL PARTS .................................4-15
SAFETY INFORMATION .......................................1-5
SAFETY LABELS...................................................2-4
POSITIONS OF SAFETY PICTOGRA ..............2-4
SAFETY LABELS ..............................................2-5
SASH GLASS INTERMEDIATE LOCK ................3-49
SERVICE PROCEDURE .....................................4-19
CHECK BEFORE STARTING .........................4-43
EVERY 1000 HOURS SERVICE.....................4-58
EVERY 2000 HOURS SERVICE.....................4-63
EVERY 250 HOURS SERVICE.......................4-45
EVERY 4000 HOURS SERVICE.....................4-67
EVERY 50 HOURS SERVICE.........................4-44
EVERY 500 HOURS SERVICE.......................4-55
WHEN REQUIRED..........................................4-19
SHIFTING BETWEE ..........................................3-104
SHIFTING GEARS.............................................3-101
SPECIFICATIONS .................................................5-2
STANDARD TIGHTENING TORQUES FOR BOLTS
AND NUTS ......................................................4-14
STARTING ENGINE ............................................3-89
STEERING MACHINE .......................................3-106
STOPPING ENGINE ............................................3-97
SWITCHES ..........................................................3-33

<T>
TABLE OF ENTER SERIAL NO. AND DISTRIBUTOR
1-9
TIPS FOR LONGER UND..................................3-117
TOOL BOX ...........................................................3-53
TRANSPORTATION ..........................................3-118
TRANSPORTATION MEANS ............................3-118
TROUBLESHOOTING .......................................3-132
AFTER RUNNING OUT OF FUEL ................3-132
IF BATTERY IS DISCHARGED ....................3-138

7-2
COLOPHON

18
 COLOPHON

D61EX-15 , D61PX-15 GALEO BULLDOZER

Form No. KEAM0049700T
©2004 KOMATSU
All Rights Reserved
Printed in Brazil 07-04