LGBVIO20.

0(EP)230603

S/N 25501 & Above

Read this manual carefully to learn how to oper- Warranty is provided as a part of Yanmar's product
ate and service your machine correctly. support program for customers who operate and
Failure to do so could result in personal injury or maintain their equipment as described in this manu-
equipment damage al. Should the equipment be abused, or modified to
change its performance beyond the original factory
This manual should be considered a permanent specifications, the warranty will become void and
part of your machine and should remain with the field improvements under warranty may be denied.
machine when you sell it. Setting fuel delivery above specifications or other-
wise overpowering machines will result in such ac-
This machine is of metric design, and conse- tion.
quently the measurements in this manual are also
metric.
Use only metric hardware and tools as specified. All information, illustrations and specifications in this
manual are based on the latest product information
Right-hand and left-hand sides are determined available at the time of publication. The right is re-
by facing in the direction of forward travel. served to make changes at any time without notice.

REFERENCE INFORMATION

Write the correct information for your YANMAR Excavator in the spaces bellow.
Always use these numbers when referring to your YANMAR Excavator.

Model name :
Serial Number :
Engine Serial Number :

Your YANMAR Excavator Dealer :

Address :
Phone :
 1. Introduction
This Operation and Maintenance Manual for the YANMAR ViO20 Excavator is designed to provide you
with important information and suggestions necessary for using the machine with safety and efficiency.
Please be sure to read through the manual before using the machine, to make yourself familiar with the
procedures and instructions for operating, inspecting and servicing. Keep in mind that failure to observe
the precautions given in the manual or using any procedures not prescribed in the manual may cause a
serious accident.

Improper use of the machine may lead to hazards which can result in death or serious injury.
Personnel engaged in operating and maintaining the machine are required to familiarize
themselves with the contents of the manual before setting about their job.

• Do not attempt to operate the machine before making yourself familiar with the contents of
the manual.

• Personnel responsible for using the machine must keep the manual at hand and review it
periodically.

• If the manual should be lost or damaged, promptly order a new copy from the dealer.

• When you transfer the machine to another user, always transfer the manual as well.

• We at YANMAR provide customers with products in compliance with all applicable your
country's regulations and industrial standards. If you are using a YANMAR machine pur-
chased abroad, the machine may lack some safety devices. Please consult your dealer to
confirm whether or not that machine is in compliance with all applicable your country's reg-
ulations and industrial standards.

• Some machine specifications may differ from those which are described in this manual be-
cause of improvements in its design and performance. If you have any questions about the
contents of the manual, don't hesitate to contact your dealer.

• Important safety instructions have been presented throughout this manual, and have been
summarized in PART ONE : SAFETY. Be sure to review these pages and pay heed to those
safety instructions before proceeding to operate the machine.

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 2. Safety Information
• The following Signal Words have been used in this Manual and on the Safety Signs to indicate the se-
riousness of the hazards that could be encountered by failing to comply with the applicable Product
Warnings, as follows:

Could result in death or catastrophic bodily injury.

Could result in bodily injury.

Could result in property damage.

The signal Word "IMPORTANT" has been utilized in this

Manual to denote those User Directions that must be fol-
lowed to assure the safe operation and maintenance of the
Excavator.

• WARNING : Never attempt to operate or service this Excavator until you have first read and under-
stood all of the applicable Product Warnings and User Directions that are set forth in this Manual and
on the Safety Signs that are affixed to this Excavator.

The failure to comply with all relevant Safety Instructions could result in bodily injury.

• WARNING : Never modify the design of this Excavator or its engine; never remove or disable any of
the installed safety guards or devices; and never use any unauthorized attachments in the operation
of this equipment.

The implementation of any unauthorized design modifications or the use of unauthorized attachments
could result in bodily injury.

Furthermore, since those actions would expressly violate the terms of Yanmar's Product Warranty, the
applicable Warranty would also be voided.

In this Manual, the major sections of the product are designated

as follows:
Machine.....refers to the entire product.
Machine base.....refers to the section consisting of the
upperstructure and the undercarriage.
Implement.....refers to the section consisting of the arm, boom
and bucket or other attachment.

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 3. Product Overview

3-1. Intended uses

The ViO20 Excavator is intended to perform the following tasks:

• Digging
• Leveling of ground
• Shoveling The machine should not be used for unintended tasks
• Ditching and Guttering
• Loading
For the details of how to work with the machine, refer to OPERATION Section "13-13. Operations using
the bucket".

3-2. Break in period

The machine should not be subjected to severe stresses and loads during the initial break in period al-
though it has been prepared well and stringently inspected before shipping. Otherwise the machine's
performance may be affected and its service life shortened. Thus it is essential to break in the machine
for the first approx. 100 service hours (reading of the hourmeter).
In breaking in the machine:
• You should warm up the engine by idling for 5 minutes before starting operations.
• You should not operate the machine under heavy loads or at high speed.
• You should not start and accelerate the engine too abruptly, or stop it too abruptly.
• You should not change travel direction too abruptly.
The safety instructions for operation and maintenance that are presented in this Manual are applicable
to each of the intended tasks. Never misuse this machine by violating the applicable safety instructions
or by attempting to perform unintended tasks, because of the danger of serious bodily injury.

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 4. Operation License
Before you operate this machine, confirm the licensing requirements that are applicable to the operation
of this machine.
Comply with all applicable laws.
Ask your dealer about licensing requirements.

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 5. Ordering Replacement Parts and Service Call

5-1. Location of machine serial number plate

The machine serial number plate is located on the turning

frame as illustrated at right. Never remove the plate for any
reason.

5-2. Location of engine serial number plate

The engine serial number plate is located on the top of the

cylinder head cover. Never remove the plate for any rea-
son.

5-3. Ordering replacement parts and service calls

When ordering replacement parts or calling for service, let

your dealer know the model designation, the machine se-
rial number, and the engine serial number on the machine
serial number plate as well as the reading of the
hourmeter.

• Machine serial number plate • Hourmeter

******-*****

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 6. Contents
1. Introduction ......................................................................................................................................0-1
2. Safety Information ............................................................................................................................0-2
3. Product Overview .............................................................................................................................0-3
3-1. Intended uses ..........................................................................................................................0-3
3-2. Break in period.........................................................................................................................0-3
4. Operation License ............................................................................................................................0-4
5. Ordering Replacement Parts and Service Call.................................................................................0-5
5-1. Location of machine serial number plate .................................................................................0-5
5-2. Location of engine serial number plate ....................................................................................0-5
5-3. Ordering replacement parts and service calls..........................................................................0-5
6. Contents ...........................................................................................................................................0-6

SAFETY
7. Basic Precautions ............................................................................................................................1-2
8. Operating Precautions .....................................................................................................................1-6
8-1. Precautions before starting the engine ....................................................................................1-6
8-2. Precautions for starting the engine, working and parking ........................................................1-8
8-3. Precautions for transportation................................................................................................1-13
8-4. Precautions for the battery.....................................................................................................1-14
8-5. Precautions for towing ...........................................................................................................1-15
8-6. Precautions for hooked bucket ..............................................................................................1-16
9. Precautions for Servicing ...............................................................................................................1-19
9-1. Precautions before servicing..................................................................................................1-19
9-2. Precautions during servicing..................................................................................................1-21
10. Safety Messages (Warning Labels) .............................................................................................1-25
10-1. Location of warning labels ...................................................................................................1-25

OPERATION
11. Identification of Important Parts .....................................................................................................2-2
11-1. Overview of the machine .......................................................................................................2-2
11-2. Controls and switches............................................................................................................2-3
12. Description of Control Devices .......................................................................................................2-4
12-1. Monitor ...................................................................................................................................2-4
12-2. Switch ....................................................................................................................................2-7
12-3. Control levers and pedals ....................................................................................................2-10
12-4. Engine hood rear cover........................................................................................................2-14
12-5. Storage space for the operation & maintenance manual.....................................................2-14
12-6. Operator’s seat ....................................................................................................................2-15
12-7. Headlight..............................................................................................................................2-16
12-8. Fuse .....................................................................................................................................2-17

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 6. Contents

12-9. Windshield (for cabin) ..........................................................................................................2-18

12-10. Air outlet (for cabin)............................................................................................................2-20
12-11. Ash tray (for cabin).............................................................................................................2-20
12-12. Right window glass (for cabin) ...........................................................................................2-21
12-13. Cabin side door..................................................................................................................2-21
12-14. Replenishment of windshield washer fluid .........................................................................2-21
13. Operating Instructions ..................................................................................................................2-22
13-1. Checking before starting the engine ....................................................................................2-22
13-2. Starting up the engine..........................................................................................................2-32
13-3. Operating and checking instructions after starting the engine .............................................2-35
13-4. Traveling ..............................................................................................................................2-37
13-5. Steering................................................................................................................................2-40
13-6. Stopping the machine ..........................................................................................................2-42
13-7. Swinging the upperstructure ................................................................................................2-43
13-8. Operating the implements....................................................................................................2-44
13-9. Precautions for operating the implement .............................................................................2-45
13-10. Precautions for working .....................................................................................................2-48
13-11. Precautions for going up and down a slope.......................................................................2-49
13-12. Escaping from the mud ......................................................................................................2-51
13-13. Operations using the bucket ..............................................................................................2-52
13-14. Replacing the bucket .........................................................................................................2-53
13-15. Parking the machine ..........................................................................................................2-55
13-16. Inspection requirements after completing operation ..........................................................2-56
13-17. Stopping the engine ...........................................................................................................2-57
13-18. Inspection requirements after stopping the engine ............................................................2-58
13-19. Locking...............................................................................................................................2-58
13-20. Handling the rubber crawler (for rubber crawler type) .......................................................2-59
13-21. Handling hydraulic P.T.O. ..................................................................................................2-64
14. Transportation ..............................................................................................................................2-69
14-1. Loading and unloading the machine ....................................................................................2-69
14-2. Precautions for loading the machine....................................................................................2-71
14-3. Precautions for transporting the machine ............................................................................2-72
14-4. Suspending the machine .....................................................................................................2-73
15. Care and Service in Cold Weather...............................................................................................2-75
15-1. Preparing for cold weather...................................................................................................2-75
15-2. Precautions after a day's work .............................................................................................2-77
15-3. After cold weather ends .......................................................................................................2-77
16. Long-term Storage .......................................................................................................................2-78
16-1. Before storing.......................................................................................................................2-78
16-2. Storing..................................................................................................................................2-79
16-3. Using the machine again .....................................................................................................2-79

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6. Contents

17. Troubleshooting ...........................................................................................................................2-80

17-1. Phenomena that are not breakdowns ..................................................................................2-80
17-2. Towing .................................................................................................................................2-81
17-3. If the battery is overdischarged............................................................................................2-82
17-4. Troubleshooting ...................................................................................................................2-87

MAINTENANCE
18. Precautions for Servicing ...............................................................................................................3-2
19. Basic Servicing Practices ...............................................................................................................3-5
19-1. Oils, fuel, and cooling water...................................................................................................3-6
19-2. Electrical equipment...............................................................................................................3-9
19-3. Hydraulic system..................................................................................................................3-10
20. Consumables ...............................................................................................................................3-11
21. Fueling, Oiling and Greasing Based on Temperature Range ......................................................3-12
21-1. Fuel and oil ..........................................................................................................................3-12
21-2. Cooling water .......................................................................................................................3-12
22. Standard Tightening Torque for Bolts and Nuts ...........................................................................3-13
22-1. Required tools......................................................................................................................3-13
22-2. Torque table.........................................................................................................................3-14
23. Replacing Essential Parts Periodically .........................................................................................3-15
24. Maintenance Table.......................................................................................................................3-17
24-1. Table of service time intervals .............................................................................................3-17
24-2. Service intervals when using the hydraulic breaker.............................................................3-21
25. Procedures for Maintenance ........................................................................................................3-22
25-1. First services........................................................................................................................3-22
25-2. Nonperiodic services............................................................................................................3-23
25-3. Checking before start-up......................................................................................................3-37
25-4. Maintenance every 50 service hours ...................................................................................3-44
25-5. Maintenance every 100 service hours .................................................................................3-46
25-6. Maintenance every 200 service hours .................................................................................3-47
25-7. Maintenance every 250 service hours .................................................................................3-54
25-8. Maintenance every 400 service hours .................................................................................3-55
25-9. Maintenance every 500 service hours .................................................................................3-58
25-10. Maintenance every 1000 service hours .............................................................................3-59
25-11. Maintenance every 2000 service hours .............................................................................3-63

SPECIFICATIONS AND DIMENSIONAL DIAGRAMS

26. Specifications and Dimensional Diagrams .....................................................................................4-2

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 6. Contents

OPTIONAL PARTS AND ATTACHMENTS

27. General Precautions ......................................................................................................................5-2
27-1. Safety precautions .................................................................................................................5-2
27-2. Precautions for mounting an attachment (implement) ...........................................................5-3
28. Handling the Hooked Bucket..........................................................................................................5-4
28-1. Checking the hooked bucket for damage ..............................................................................5-4
28-2. Prohibitions ............................................................................................................................5-4
28-3. Precautions ............................................................................................................................5-4
29. Optional Parts and Attachments ....................................................................................................5-5
29-1. Optional parts and attachments ..................................................................................................5-5
30. Noise, vibrations, fittings ................................................................................................................5-7
31. Tecnical Data .................................................................................................................................5-8

NOTES
32. Maintenance Log............................................................................................................................6-2
33. Notes ..............................................................................................................................................6-6

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 MEMO

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 SAFETY

Never attempt to operate or service this Excavator until you have first read
and understood all of the applicable Safety Instructions that are set forth in
this Manual.

The failure to comply with all relevant Safety Instructions could result in bodi-
ly injury.

1-1
 These instructions should be strictly followed
7. Basic Precautions WARNING
for the safety of you, others and your machine.

Follow safety rules at your workplace

• The operation and servicing of this machine is restricted to qualified persons.

• When operating or servicing the machine, follow all the safety rules, precautions and procedures.
• Any work performed by a team or with a signal person should be conducted in accordance with
signals agreed on beforehand.

Install safety devices

• Make sure that all guards and covers are installed in their correct position. If any of them are dam-
aged, repair them immediately.
• The proper use of all safety devices, such as lock lever, should be well understood by the machine
operator.
• Never remove the safety devices. Always make sure that they operate properly.
For lock lever, refer to Section "13-15. Parking the machine".
• Incorrect operation of the safety devices could cause serious bodily injury.

Wear proper clothing and safety items

• Do not wear loose clothing or jewelry that can be caught on the

control levers and other machine parts. Also avoid wearing
working clothes stained with oil as they can ignite.
• Be sure to wear a helmet, safety goggles, safety shoes, a
mask, gloves and other protective items, as appropriate.
Take particular precautions when generating metal debris,
when striking metal objects with a hammer or when cleaning
components with compressed air.
Also make sure there are no persons near the machine.
For driving the pins, refer to Section "13-14. Replacing the bucket".
For cleaning the elements, refer to Section "25-2. Nonperiodic services".

Alcohol

• Never operate the machine while you are under the influence of alcohol or when you are ill or feel
unwell as this results in accidents.

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 WARNING Neglecting these instructions may cause extreme hazards. 7. Basic Precautions

Avoid unauthorized modifications

.
• Modifications not recommended by YANMAR may cause safety hazards.
• When you wish to modify your machine, contact your dealer. The implementation of unauthorized
modifications or the use of unauthorized attachments could result in bodily injury, since those ac-
tions would also violate, the terms of YANMAR's Warranty, it would be voided

Always lock up your machine when leaving the operator's seat

• When leaving the operator's seat, be sure to place the lock lever in the lock position, to prevent
accidental machine movement which could result in bodily injury.
• When you leave the machine:
(1) Lower the bucket to the ground.
(2) Place the lock lever in the lock position.
(3) Stop the engine.
(4) Set all the locks in to the lock position.
(5) Be sure to take the key out of the starter switch.
For information on parking the machine, refer to Section
"13-15. Parking the machine".

Use handrails and steps when getting on and off

• Do not jump on or off the machine. Never get on or off a machine in motion as it may result in bodily
injury.
• When getting on and off the machine, face the machine and use the handrails and steps.
• Do not use control levers as handrails.
• Make sure that you maintain three point contact with the handrails or the steps.
• If the handrails and the steps are soiled with oil or dirt, clean them off immediately.
Repair any damaged parts and retighten any loose bolts.

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7. Basic Precautions WARNING These instructions should be strictly followed for the safety of you, others and your machine.

Keep fuel and oil away from sources of ignition

• Open flames can ignite fuel, oil, hydraulic oil or antifreeze solutions, which are flammable and dangerous.
Special attention must be paid to the following matters.
• Keep flammable materials away from lighted cigarettes or matches, or any other sources of ignition.
• Never refuel while the engine is running. Smoking during refueling must be strictly prohibited.
• Firmly tighten the caps on the fuel and oil tanks.
• Store fuel and oil in a cool and well-ventilated place where they are not subjected to direct sunlight.
• Fuel and oil must be stored in a place which meets all applicable safety regulations. Unautho-
rized persons should not be allowed entry.

Avoid removing filler caps while temperatures are high

• The engine coolant, engine oil and hydraulic oil are hot and under
pressure immediately after the machine stops operation.
Removing caps, draining coolant or oil, or replacing a filter at such a
time may cause burns. Allow temperatures to cool down and follow
the procedures in this manual.
• When removing the radiator cap, stop the engine and allow the cool-
ant to cool down, then turn the cap slowly to relieve all pressures.
• Before removing the cap from the hydraulic oil tank, stop the engine
and turn the cap slowly to relieve all pressure to prevent oil from spouting out.

Avoid harmful asbestos dust

• Air containing asbestos dust is carcinogenic and is hazardous to hu-

mans. Inhalation of the air may cause lung cancer. When handling
materials that may contain asbestos, keep in mind that:
• Compressed air must not be used for cleaning.
• Water must be used to clean the machine to prevent asbestos from
scattering in the air.
• You must work on the windward side when operating the machine
in a place where there may be asbestos dust.
• You should wear breathing apparatus as necessary.

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 WARNING Neglecting these instructions may cause extreme hazards. 7. Basic Precautions

Prevent crush injuries by the implements

• Keep hands, arms and all other parts of your body away from all the
moving parts, particularly between the implements and the machine
and between the hydraulic cylinder and the implements, as pinch
points are created in those areas.

Keep a fire extinguisher and first aid kit handy

• The workplace must be provided with a fire extinguisher. Read in-

structions on the label to familiarize yourself with how to use it.
• Keep a first aid kit in a prescribed place.
• Advise what to do in the event of fire or accidents.
• Indicate who to contact in an emergency and keep their telephone
number in a prominent place.

Precautions for installing optional parts and attachments

• When installing or using optional attachments, read the operating instructions for the attachments
and the Manual Sections relating to the installation of attachments.
• Use only attachments authorized by YANMAR. The use of unauthorized attachments may affect
not only the safety of the machine but also the proper operation and life of the machine.
• The use of unauthorized attachments would also violate the terms of YANMAR's Warranty, so that
it would be voided.

Caution for cabin glass

• If the glass of the cabin should be broken by accident, it is very dangerous since the operator’s
body might contact the implement directly.
Immediately stop working to replace the broken glass with a new one.

1-5
 These instructions should be strictly followed
8. Operating Precautions WARNING
for the safety of you, others and your machine.

8-1. Precautions before starting the engine

Ensure the safety of your workplace

• Before starting the machine, check to see if there are any hazards
in your working area.
• Examine the terrain and soil, and decide the best way to do the
work.
• When working on the street, provide a signal person or fence for
the safety of vehicles and pedestrians.
• If there are underground utilities at the work site, such as water pipes,
gas pipes, high-voltage conduits or others, contact the responsible
companies to locate them exactly, so as not to damage them.
• Before operating the machine in water, or crossing a creek, con-
firm the condition of the submerged ground, the water depth and
the water flow speed, and make sure that the depth is within the
allowable level.
For allowable water depth, refer to Section "13-10. Precautions for working".

Prevent fire

• Wood chips, dead leaves, trash and other flammable materials in

proximity to the engine are hazardous as they may cause fire.
Always check and keep your machine clear of these flammable
materials.
• Check for any leaks from fuel, lube oil or hydraulic oil lines. Repair
faults and clean spilled oil as necessary.
For additional information, refer to Section "13-1. Checking
before starting the engine".
• Check to see where fire extinguishers are located and know how
to use them.

Inspect around the operator's seat

• Dirt, oil and snow on the floor, levers, handrails or steps are slippery and hazardous. Remove them
all completely.
• Keep parts and tools away from the operator's seat as they may damage the control levers or
switches or create any other hazards.

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 WARNING Neglecting these instructions may cause extreme hazards. 8. Operating Precautions

Provide adequate ventilation when working in an enclosed area

Engine exhaust fumes are harmful to the human body and their in-
halation is extremely hazardous. When starting the engine in an en-
closed area, open the windows and doors for ventilation. Also do not
idle the engine unnecessarily or leave the engine running while the
machine is not in use.

Keep the headlights clean

• Keep the surface of the headlights clean for clear view.

• Make sure that your machine is equipped with headlights and all required working lamps, and that
they work properly.

Fasten the seatbelt

• For your safety, ROPS (Roll-Over Protective Structure)/FOPS (Falling Objects Protective Struc-
tures) with a seatbelt is installed.
• Always fasten the seatbelt across the pelvic region and adjust snugly before you operate the ma-
chine.
Never fasten a seatbelt across the abdomen.
• The seatbelt must be replaced after an accident.
• In addition the seat and seat mounting must be checked by your dealer after an accident has oc-
curred.
• If the seat and seat mounting are damaged, they must be replaced.

ROPS/FOPS

• Never modify the structural member of ROPS/FOPS.

• If ROPS/FOPS is damaged, replace it immediately to prevent bodily injury.
Never repair or modify it.

Caution for the protection of plants from hot wind

The hot wind of the high temperature is exhausted from the muffler and the radiator.
If this hot wind hits plants directly, they will die.
Give a cover board to protect plants from the hot wind when working near the arranging fence or
plant.

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8. Operating Precautions WARNING These instructions should be strictly followed for the safety of you, others and your machine.

8-2. Precautions for starting the engine, working and parking

Signal before starting the engine

• Check the machine carefully before initial start up for the day.
• Make sure there are no persons near the machine before getting on it.
• Never start the engine when the "SERVICING IN PROGRESS" tag is attached to the control sys-
tem.
• Sound the horn to alert people nearby before starting the engine.
• Be sure to start the engine and operate the machine from the operator's seat only.
• Do not allow any other persons to get on the machine.

Check the position of the blade before operating the machine

• Check the position of the blade before operating the travel

levers. When the blade is located in the back, the opera-
tion of the travel levers is reversed.
For instructions on How the machine travels, refer to
Section "13-4. Traveling".

Make sure there are no persons nearby when turning or reversing the machine

• A signal person should be provided for safety when the work site is haz-
ardous or when visibility is poor.
• Keep all other persons away from the work site or the traveling path of
the machine.
• Alert persons nearby with a horn or other signal before starting the ma-
chine.
• The machine permits a limited range of vision toward the rear. Make sure
there are no persons behind the machine before reversing.

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 WARNING Neglecting these instructions may cause extreme hazards. 8. Operating Precautions

Precautions for traveling

• When traveling with the machine, keep the bucket 15.75 to 19.69 in. (40 to 50 cm) above the
ground with boom and arm folded as illustrated below.
• If you need to operate the control levers while traveling, never move them abruptly.
• Travel the machine at a low speed and slow down when turning on rough terrain.
• Avoid running over obstacles if possible. If unavoidable, run the machine at a low speed while
keeping the implement close to the ground. Never run over obstacles that may cause the machine
to tilt more than 10 degrees.

Orientation in travel

15.75 to 19.69 in. More than

(40 to 50 cm) 10 degrees

Running the machine on a slope

• Run the machine carefully on a slope to avoid overturning or skidding sidewards.

• When running the machine on a slope, keep the bucket 7.87 to 11.8 in. (20 to 30) cm above the
ground so that you can immediately lower it to the ground and stop the machine in an emergency.
• Never turn the machine on a slope or run it across the slope.
Move down to flat ground and then make a turn.
For instructions on how to run the machine on a slope, refer to Section "13-11. Precautions
for going up and down a slope".
• On grasses, dead leaves or a wet metal plate, even with a slight gradient, the machine will easily
slip. Under those circumstances, run the machine carefully at low speed to prevent it from skidding.
Going down a slope Going up a slope

90 degrees to
110 degrees

90 degrees to
110 degrees

7.87 to 11.8 in.

(20 to 30 cm)
7.87 to 11.8 in.
(20 to 30 cm)

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8. Operating Precautions WARNING These instructions should be strictly followed for the safety of you, others and your machine.

Avoid hazardous work

• Undermining a cliff is dangerous as it may cause a rockslide or landslide.

• Undercutting the machine is dangerous as it may cause a cave-in, resulting in the machine over-
turning and falling into the excavation.

Never suspend loads without a hooked bucket

• Suspending loads without a hooked bucket is extremely hazardous.

• To suspend loads, the machine must be equipped with a hooked bucket specifically designed for
the purpose.
For information on suspending loads, refer to Section "13-9. Precautions for operating the
implement".

Keep away from electric power lines

• Working in the vicinity of overhead electric power lines presents a very serious hazard and special
precautions must be taken. For purposes of this manual you are considered to be working in the
vicinity of overhead power lines when the attachment or load of your excavator, in any position,
can reach to within the minimum distances shown below.
• The following procedures are effective in preventing accidents or injuries.
1) Wear shoes with rubber or leather soles.
2) Use a signal person to warn the operator when the machine is getting too close to a power line.
• If the machine should contact a wire, the operator must not leave the seat.
• When working near power lines, caution all ground personnel to stand clear of the machine.
• To determine the transmission voltage at the working site, contact the electric utility concerned.

Transmission voltage (V) Minimum safe distance [ft. (mm)]

Power 100/200 or less 6.6 (2000) or more
distribution 6600 or less 6.6 (2000) or more
22000 or less 9.8 (3000) or more
Transmission 66000 or less 13.1 (4000) or more
line 154000 or less 16.4 (5000) or more
275000 or less 23.0 (7000) or more

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 WARNING Neglecting these instructions may cause extreme hazards. 8. Operating Precautions

Prevent bumping the implements

• When traveling through tunnels or under bridges, or working at a site near other overhead obsta-
cles, operate the machine carefully so as not to bump the boom, arm, or the implement against
those overhead obstacles.

Work only where visibility as good

• When working in a dark place, light up the area with the work lights and head lights, and prepare
extra lighting equipment as necessary.
• Stop working when fog, snow or rain impedes your view.

Work carefully in a snow-covered areas

• A snow-covered ground and icy roads are dangerous as they may cause the machine to skid even
on a slight slope. Run the machine at low speed, and never start, stop or turn abruptly on such
ground or under such road conditions.
• Be careful removing snow as road shoulders or other hazards may be buried under snow.

Unstable ground creates a high possibility of overturn

• Keep away from cliffs, road shoulders or trenches if possible as the ground near them is unstable.
The ground may crumble due to the weight or vibrations of the machine, resulting in an overturn
or fall of the machine. Be particularly careful when working immediately after rainstorm or after
blasting as the ground may be unstable.
• Ground-fills or ground near a ditch may be unstable and may crumble due to the weight or vibra-
tions of the machine, causing the machine to tilt. Much caution must be taken in working in these
areas.
• When working in an area where is a high possibility of falling rocks, wear a hard-hat and stay under
the canopy.

1-11
8. Operating Precautions WARNING These instructions should be strictly followed for the safety of you, others and your machine.

Working on a slope

• Be aware that the machine may tip over when swinging the
upperstructure or swinging the implement on a slope.
• Never swing the upperstructure toward the downward side
of the slope with earth loaded in the bucket.
(See the illustration at upper right.)
• If swinging is unavoidable, level off a work area to maintain
the machine as horizontal as possible, then swing.
(See the illustration at lower right.)
For levelling off a work area, refer to Section "13-11.
Precautions for going up and down a slope".

Parking the machine

• Park on level ground. If park on a slope is unavoidable,

block the tracks with solid pieces of wood and dig the buck-
et into the ground. (See the illustration at right.)

• If necessary to park the machine on the side of a road, set

up a warning flag, fence, or lamp that can be easily recognized by passing cars and pedestrians
but does not impede them.
For parking procedures, refer to Section "13-15. Parking the machine".

• When leaving the operator's seat, do the following:

(1) Be sure to place the bucket on the ground.
(2) Set the lock lever to the lock position.
(3) Stop the engine.
(4) Set all the locks to the lock position.
(5) Be sure to take the key out of the starter switch.
For information about parking procedures, refer to
Section "13-15. Parking the machine".
For information about the parts to be locked, refer to Section "13-19. Locking".

1-12
 WARNING Neglecting these instructions may cause extreme hazards. 8. Operating Precautions

8-3. Precautions for transportation

Precautions for loading and unloading the machine

• Be careful in loading and unloading the machine, because it is a job of high hazard potential.
• Load or unload the machine at a low engine speed, and low travel speed.
• Load or unload the machine on the level, solid ground away from the shoulder of the road.
• Use ramp plates of adequate strength with hooks on their
ends.
Check to see that the ramp plates are wide, long, and thick
enough to sustain the load so that you can load or unload the
machine safely. Support the ramp plates with blocks, to pro-
vide additional strength.
• Securely hook the ramp plates to the deck of the truck so that
they will not come off.
• Remove grease, oil, and other slippery deposits from the ramp plates, and remove mud from the
tracks to prevent the machine from skidding on the ramp plates.
• Do not load or unload the machine if the ramp plates are slippery because of rain, snow or ice.
• Never change travel direction while on the ramp plates. If you need to change travel direction, go
down the ramp plates, and change direction on the ground.
• After loading the machine, block it with lumber and secure the machine with a chain or a wire rope
so that the machine will not move during transit.
For instructions on loading and unloading the machine, refer to Section "14. Transporta-
tion".
For instructions on securing the machine, refer to Section "14. Transportation".

Precautions for transporting

• Transport the machine safely in accordance with the laws associated with applicable law.
• Select a travel route consistent with the width, height and weight of the machine loaded on the
truck.

1-13
8. Operating Precautions WARNING These instructions should be strictly followed for the safety of you, others and your machine.

8-4. Precautions for the battery

Be careful in handling the battery

• The battery electrolyte contains dilute sulfuric acid, which can severely burn the eyes or skin. Al-
ways wear safety goggles and protective clothing when servicing the battery. If contact with the
eyes or skin should occur, flush with a large amount of water and obtain prompt medical treatment.
• Because flammable hydrogen gas is produced by the battery, ignition and explosion may occur.
Keep flames and sparks away from the battery.
• If you swallow battery electrolyte by mistake, drink a large amount of water, milk, or fresh eggs,
and obtain medical treatment immediately.
• Before checking or handling the battery, be sure to stop the engine and turn the starter switch to
the "OFF" position.
• Be careful not to cause a short circuit by placing a tool across the terminals of the battery.
• If a terminal connection is loose, sparks may be generated due to contact failure, causing possible
ignition and explosion. Be sure to connect the terminals securely.

Observe the procedures for starting the engine us-

ing booster cables

• When you start the engine using booster cables, wear safety goggles.
• If you start the engine by taking electric power from another machine, do not allow your machine
to contact the other machine.
• To connect the booster cables, begin with the positive terminal, and to disconnect them, begin with
the negative terminal (ground side).
• If a tool simultaneously touches the positive terminal and the machine, potentially hazardous
sparks may be generated.
• Do not connect the booster cables to the terminals in reverse polarity. In other words, never con-
nect the negative terminal on one machine to the positive terminal on the other machine.
• As the last step, connect the negative booster cable terminal to the upper structure frame. At that
time, sparks will be generated. Consequently, connect the terminal to a point as far away from the
battery as possible.
For information about starting the engine using booster cables, refer to Section "17-3. If the
battery is overdischarged".
1-14
 WARNING Neglecting these instructions may cause extreme hazards. 8. Operating Precautions

8-5. Precautions for towing

Hook the wire rope on the frame when towing

• Improper towing procedures can cause death or serious injury.

• When towing a machine with another machine, use a wire rope strong enough to sustain the ma-
chine weight.
• Never tow a machine on a slope.
• Do not use a towing rope that is kinked, distorted or damaged.
• Do not ride on the towing cable or on the wire rope.
• When connecting an object to be towed, make sure that no person
enters the space between the machine and the object.
• To connect an object to be towed, hook the sling belt as illustrated
at right.
• The hook provided on the machine is intended for stabilizing the
machine during transporting. Never use it for towing.
For information about towing the machine, refer to Section"17-2. Towing".

1-15
8. Operating Precautions WARNING These instructions should be strictly followed for the safety of you, others and your machine.

8-6. Precautions for hooked bucket

8-6-1. General precautions

Special hook

• A dedicated hook is required for suspending a load.

• The following procedures are extremely dangerous and must never be at-
tempted:
• Suspending a load with a wire rope hooked on the bucket teeth
• Suspending a load with the wire rope directly hooked on the boom or the
arm

Checking the hook

• Check for abnormalities before suspending a load, as follows:

• No cracks or deformations in the suspension sling belt and fittings
• No abnormalities in the locking devices
• Every time you make a voluntary monthly check or a specified annual check, check all suspension
gear for abnormalities and enter the results in the inspection records.

Securely attach a wire rope to the hook

• To suspend a load, securely attach a wire rope to the dedicated suspension hook.

Precautions for selecting a place to park the machine

• Survey the terrain and soil and select a solid, level spot for parking the machine, for maximum sta-
bility.

Do not use the machine for other than the specified purpose

• Never suspend a person together with the load, under any circumstances, because of the extreme
danger.

Keep out of the radius of the work area

• Never permit anyone to enter the work area because of the danger of spilling or swinging the load.

1-16
 WARNING Neglecting these instructions may cause extreme hazards. 8. Operating Precautions

Designate a leader to supervise suspension work

• When suspending a load, designate a leader to supervise the work and follow the leader's instruc-
tions.
• Follow the leader's instructions for the handling methods and procedures.
• Define hand signals in advance for communicating, and respond to the leader's signals.

Handling the wire rope

• When handling the wire rope, use leather gloves.

For additional information about the hooked bucket, refer to Section "28. Handling the
Hooked Bucket".

1-17
8. Operating Precautions WARNING These instructions should be strictly followed for the safety of you, others and your machine.

8-6-2. Precautions for suspending a load

Move a suspended load slowly

• Raise and swing a suspended load slowly.

• Do not operate the control levers or the accelerator lever abruptly.
• The swing speed is three to four times higher than that of a truck crane. Swing the upper structure
slowly.

Do not leave the operator's seat

• Never leave the operator's seat with a load suspended.

Do not operate the machine unsafely

• Working beyond the machine's capacity can cause accidents or failures. Suspend loads within the
machine's capacity.
• Do not suspend a load greater than the specified maximum, or subject to a sharp impact. Those
actions may damage the machine.
• Do not move the suspended load sideways or toward the machine, or haul it. Those actions are
extremely dangerous.

Do not travel while suspending a load

• Do not travel while suspending a load.

Make sure of the posture of the machine

• If the bucket hook is not maintained in a vertical position, the wire rope or the shackle may slips off
the hook. Be careful to maintain a vertical hook angle, so that the wire rope or the shackle will not
come off.

1-18
 Neglecting these instructions
9. Precautions for Servicing WARNING
may cause extreme hazards.

9-1. Precautions before servicing

Attach the "SERVICING IN PROGRESS" tag to an implement control lever

• If another person should start the engine or operate the control levers while service is in progress,
the service personnel can sustain serious bodily injury.
Attach the "SERVICING IN PROGRESS" tag indicating "Servicing in Progress" to one of the im-
plement control levers.
The "SERVICING IN PROGRESS" tag is enclosed with the Operation Manual.
Article number : 172437-03250

Use appropriate tools

• Using damaged or worn tools or using tools inappropriate for the

required application is very dangerous, and may also cause
damage to the machine. Make sure to use the tools that are ap-
propriate for the specific job.
For information about tools, refer to Section "22-1. Required
tools".

1-19
9. Precautions for Servicing WARNING Neglecting these instructions may cause extreme hazards.

Periodically replace the parts essential to safety

• Aging or damage to the parts listed below can cause a fire.

Make sure that they are replaced periodically.
• Fuel system : Fuel hose and fuel tube cap
• Hydraulic system : Outlet hose of main pump
• The parts listed above must be replaced periodically even if no abnormality is found in them.
(They age with time.)
• If any abnormality is found in them, replace or repair the parts even though the suggested replace-
ment time has not been reached.
For information about replacing essential safety parts, refer to Section "23. Replacing Es-
sential Parts Periodically".

Stop the engine before beginning the inspection and servicing

• Be sure to stop the engine before performing inspection and

servicing.
• If necessary to perform service while running the engine, as
when cleaning the inside of the radiator, be sure to set the
lock lever to the lock position and do the job together with a
partner.
(One should take the operator's seat so that he or she can
stop the engine at any time.)
That person must be careful not to touch any levers in the
cabin.
• Be extremely careful not to contact the moving fan or fan or
fan belt, or any hot surfaces.

1-20
 WARNING These instructions should be strictly followed for the safety of you, others and your machine. 9. Precautions for Servicing

9-2. Precautions during servicing

Keep unauthorized persons away

• Never admit any persons into the work area who are not taking part in the work. Be conscious of
the safety of other persons.
Be especially careful when grinding, welding, or using a large hammer.

Removed attachments

• When an attachment is placed on the ground or against a

wall after removing it or prior to reinstalling it, be sure that
it is stable to prevent it from falling down.

Working under the machine

• Before performing service or repairs underneath the ma-

chine, place the implement on the ground in its lowest po-
sition.
• Be sure to apply blocks to the tracks to lock the tracks se-
curely.
• Never perform service underneath the machine if it is not
completely stable.

Keep the machine clean

• Spilled oil or grease, or scattered parts are dangerous and

can cause falls. Keep the machine clean.
• Getting water into the electrical system may cause it to
malfunction, resulting in faulty operation of the machine.
Also it may permit electrical leaks that could cause a fire
or electric shocks.
• Never clean the sensors, connectors or the operator's
seat with water or steam.

1-21
9. Precautions for Servicing WARNING Neglecting these instructions may cause extreme hazards.

Precautions for fueling and oiling

• Spilled fuel and oil could cause a fire and they are dangerously slippery. Wipe up spills immediately.
• Close the fuel cap and oil cap securely.
• Never use fuel for cleaning.
• Provide good ventilation when replenishing fuel or oil.

Radiator cooling water level

• Before checking the radiator cooling water level, stop the

engine and wait until the engine and the radiator have
cooled down.
• Slowly loosen the cap to release the inner pressure before
removing the cap.

Use an explosion-proof lighting source

• Use an explosion-proof lighting source when checking the

fuel, the oil, the cooling water, or the battery electrolyte.
Failure to use a explosion-proof lighting source may
cause ignition to occur, inducing an explosion.

Precautions for handling battery

• When welding or repairing the electrical system, discon-

nect the negative terminal of the battery to interrupt the
electric circuit.

1-22
 WARNING These instructions should be strictly followed for the safety of you, others and your machine. 9. Precautions for Servicing

Handling high-pressure hoses

• Leaks of fuel and oil could cause a fire.

• Do not bend a high-pressure hose forcibly, or strike it with a hard object. Because abnormally bent
or damaged piping, tubes, and hoses easily burst under high pressure, never use them.

Be careful of hot oil under high-pressure

• The hydraulic system for the implement operates under high pressure.
When replenishing or draining hydraulic oil, be sure to first relieve the high pressure.
• The emission of hot oil under high-pressure from a small leak could result in serious bodily injury.
Wear safety goggles and thick gloves when checking for leaks. Use a piece of cardboard or a ply-
wood block to detect emissions of hot oil.
If the hot oil should contact your body, obtain prompt medical treatment.

Be careful when servicing systems under high temperature and high pressure

• The engine cooling water and each lube oil system are still under high temperature and pressure
immediately after the engine has stopped. Removing caps, draining oil and water, or replacing filter
elements at that time may cause a burn. Wait until the temperature drops, then begin servicing in
accordance with the procedures described in this manual.
For cleaning the inside of the cooling system, refer to Section "25-
2. Nonperiodic services".
For checking the level of the cooling water and the hydraulic oil,
refer to Section "25-3. Checking before start-up".
For checking the oil levels in various systems and replenishing
the oil, refer to Section "25-3 to 5. Periodic services".
For replacing the oils in various systems and replacing the filter
elements, refer to Section "25-6 to 8. Periodic services".

1-23
9. Precautions for Servicing WARNING Neglecting these instructions may cause extreme hazards.

Hazards from the high-pressure grease when adjusting the track crawler tension

High-pressure grease is enclosed in the track crawler ad-

juster.
Failure to use the specified procedures for adjusting the
track crawler tension, could cause grease plugs or nipples
to eject, which could result in bodily injury.
• Do not loosen the grease draining plug more than one
turn.
• Never position your face, hands, legs, or body in line with
the grease draining plug and valve.
For information about adjusting track crawler ten-
sion, refer to Section "25-2. Nonperiodic services".

Rotating radiator fan and fan belt

• Never contact the rotating radiator fan or fan belt with any
object.
• Contacting the rotating radiator fan or fan belt with any ob-
ject can result in serious bodily injury.

Processing wastes

• Do not dispose of waste oil in the sanitary sewer system.

• Always drain the oil from the machine into a secure con-
tainer, and never directly to the ground.
• When disposing of toxic wastes such as fuel, oil, cooling
water, solvent, filters, and spent batteries, comply with all
applicable disposal regulation.

1-24
 10. Safety Messages (Warning Labels)
There are a number of Warning Labels on the machine. Full descriptions of all Warning Labels and their
locations are reviewed in this section. Periodically confirm whether all Warning Labels are still mounted
in their correct locations and can be easily read.

If a warning label is missing, damaged or cannot be read, it must be promptly replaced. Also, if a warning
label was mounted on a part which is replaced, a new warning label must be installed on the replaced
part.

Contact your dealer to obtain new labels. The part code number is shown on each warning label as well
as on the reproductions in this manual.

10-1. Location of warning labels

(4)

(11)

1-25
10. Safety Messages (Warning Labels) WARNING Neglecting these instructions may cause extreme hazards.

(10)

(13)

(10)

(10) (11)
(12)

1-26
 WARNING These instructions should be strictly followed for the safety of you, others and your machine. 10. Safety Messages (Warning Labels)

(1) (2) (3)

(4)

(5) (6)

1-27
10. Safety Messages (Warning Labels) WARNING Neglecting these instructions may cause extreme hazards.

(7) (8)

(9) (10)

1-28
 WARNING These instructions should be strictly followed for the safety of you, others and your machine. 10. Safety Messages (Warning Labels)

Only for Germany version:

(11)

(12)

(13)

Der Aufenthalt im Gefahrenbereich ist verboten!

1-29
 MEMO

1-30
OPERATION

2-1
11. Identification of Important Parts

11-1. Overview of the machine

Arm cylinder
Bucket cylinder
Boom

Arm
Headlight
Bucket link

Bucket pin

Accelerator lever
Bucket
Lock lever

Boom cylinder

Right Rear

Blade
Left
Front

Boom light (Work lamp)

Canopy

Cabin type
Idler Boom bracket
Boom swing cylinder
Rubber crawler
Track roller

Sprocket

2-2
 11. Identification of Important Parts

11-2. Controls and switches

P.T.O. pedal Pedal guard Travel pedal Pedal guard

High-speed pedal
Boom swing pedal

Lock lever
Lock lever
Horn switch
Control lever (L)

Control lever (R)

Blade lever

Light switch
Travel lever
Wiper switch
(For cabin type)
Heater switch
(For cabin type)

Monitor
Accelerator lever Starter switch

For cabin type Room lamp switch

2-3
 12. Description of Control Devices
This section describes several of the control devices necessary to operate the machine. In order to en-
sure safety and comfort in working with the machine, it is imperative for you to fully understand how to
operate and interact with these devices.

12-1. Monitor

IMPORTANT
For start-up inspection, be sure to refer to PART
THREE: MAINTENANCE, or Section "13. Operating In-
structions" as well as the monitor messages as shown
above.

When an indicator lamp lights and a buzzer sounds

during operation, immediately stop operation and
check and service the abnormality.

When the starter switch key is in the “ON” position, the

monitor lamps (3), (4) and (5) light and buzzer sounds.
(Only the water temp alarm lamp (5) goes off in a few sec-
onds.)
Normally, all monitor lamps go off after the engine starts.
When there is any failure during operation, a lamp lights
and buzzer sounds. (If the starter switch key is in the “ON”
position and a monitor lamp does not light, its bulb must be
burnt out.)

2-4
 12. Description of Control Devices

(1) Fuel gauge

The fuel gauge works while the starter switch key is in the
“ON” position and indicates the fuel amount in the fuel
tank. When the gauge pointer indicates close to E (empty),
refill fuel oil soon.
• It is not abnormal that the fuel gauge may not indicate
properly immediately after the starter switch key is
turned to the “ON” position.
• The reading on the fuel meter scale is affected by how
much the machine is slanted.

(2) Water temp meter

This indicates water temperature for engine. During oper-
ation, the normal water temperature is within the limit of
white. When the cooling water temperature rises till the
limit of red during operation, idle the engine at low speed
until the water temperature cools down.

(3) Engine oil pressure alarm lamp

If engine oil pressure falls below the normal level, the
alarm lamp will turn on and the buzzer will sound. In this
event, stop the engine and inspect it according to Section
"17-4. Troubleshooting".

(4) Battery charge alarm lamp

If the battery is not charged properly, the alarm lamp will
flash. In this event, inspect the battery charging circuit. If
you find something abnormal with it, take corrective action
by referring to Section "17-4. Troubleshooting".

(5) Water temp alarm lamp

When the starter switch is turned to the "ON" position, the
alarm lamp goes on and then goes off in a few seconds.
When the cooling water temperature rises abnormally dur-
ing operation, the alarm lamp goes on and the buzzer
sounds, indicating engine overheating.
Idle the engine for a while, and stop the engine. After the
engine has cooled, take corrective actions.

2-5
12. Description of Control Devices

(6) Hourmeter
The hourmeter indicates the accumulated service hours
for the machine.
The reading of the hourmeter helps you set time intervals
for periodic servicing of the machine. While the engine is
running, the hourmeter will continue registering even if the
machine is not being operated.

• The hourmeter registers "1" per hour regardless of en-

gine rotational speed.
The digit at the far right registers "1" per 0.1 hour (6
min.).

2-6
 12. Description of Control Devices

12-2. Switch

(3)
For cabin type

(2) (6)
(4)
(5)

(1)

(1) Starter switch

Use this switch to start and stop the engine.
• OFF position
Turn the key to "OFF" to stop the engine and disconnect
electrical circuit or remove the key.
• ON position
Turn the key to "ON" to connect the electrical fuel sole-
noid circuit and the electrical charging circuit. (Keep the
key in this position while running the engine.)
• START position
Turn the key to "START" to start the engine. Release the
key after the engine is started and it will return to the
"ON" position.
• AIR HEATER position
Turn the key to activate the preheating circuit and warm
up intake air to start the engine easier in cold weather.
(Set the key to this position when the outside tempera-
ture is low.)
• When the engine is not running and the switch is in the
"ON" position, the buzzer keeps sounding.
Turn the switch to the "OFF" position to stop sounding.

2-7
12. Description of Control Devices

(2) Light switch

The boom light and the headlight go on when the switch is
turned on with the starter switch set to the “ON” position.
• ON : The lamps go on.
• OFF : The lamps go off.

IMPORTANT
Do not keep on the lamps on for a long time while the
engine is not running. The battery runs down and the
engine cannot be started.

(3) Horn switch

Press the switch on the top of the right control lever to
sound the horn.

(4) Wiper and windshield washer switch (for cabin)

This switch serves both wiper switch and windshield wash-
er switch.
1) Wiper switch
Move the switch to the "ON" position to actuate the wiper
of the windshield.
• ON : Wiper works.
• OFF : Wiper stops.
2) Windshield washer
Push the wiper switch.
The windshield will be sprayed with windshield washer fluid.

IMPORTANT
• Do not push the switch when the tank is empty.
It could cause pump failure.
• Wiping the dry windshield could damage the glass.
Use the wiper only when the windshield is wet.
• The wiper blade may freeze in cold weather. Do not
attempt to move it; otherwise the wiper motor will be
damaged.

2-8
 12. Description of Control Devices

(5) Heater switch (for cabin)

Use this switch to warm up the air in cabin. Move the
switch to select fan speed. The heater switch allows you to
select a high or low draft volume by setting it as follows:
• LO : Low fan speed.
• HI : High fan speed.
• OFF : Off.
Operate the heater switch after the cooling water has
warmed up.

(6) Room lamp switch (for cabin)

The room lamp goes on when the switch is turned on with OFF ON
starter switch set to "ON" position.
• ON : The lamp goes on.
• OFF : The lamp goes off.

2-9
12. Description of Control Devices

12-3. Control levers and pedals

(10) (7) (9) (9) (8)

(1)
(1)

(2)

(4) (3)

(6)

(5)

(1) Lock levers (for implement control levers on both sides and travel lever)
The lock levers lock the implement control and travel levers. When pulling the left lock lever back, the
control lever stand (L) comes up. While the control lever stand (R) does not come up when pulling the
right lock lever back.

• When leaving the operator's seat, be sure to put the bucket

on the ground and move the lock levers to the lock posi-
tions. Keep in mind that if you should touch the unlocked
lever inadvertently, a serious accident could occur.
• Be sure to place the lock levers securely in position. If not,
they could come out of the lock position. Thus always
make sure that the lock levers are in position as illustrated
in the right figure.
• Note that even if the lock levers are in the lock position, the blade and the boom swing are
not locked and are free to operate.
• When pulling the lock levers back, be careful not to touch the implement control lever.
• Remember that if the lock levers are not pulled back fully, the implement will not be locked.

IMPORTANT
The machine uses a hydraulic lock system. If the lock levers are in the lock position, all the hy-
draulic cylinders for the boom, arm, and bucket as well as the swing and travel motors will not
activate although the right and left implement control levers are free to move.

2-10
 12. Description of Control Devices

When pushing the lock levers down forward, be

careful not to touch the implement control lever.

The relationship between the control lever shift

configuration and the implement movement is de-
tailed in this manual. To prevent an accident due to
operational error, therefore, the hydraulic system
must not be modified by reconnecting the hydrau-
lic hoses and valves.

(2) Control lever (L)

(3) Control lever (R)

Use these levers to control the implements and swinging

of upperstructure.
Refer to Section "13-8. Operating the implements".

2-11
12. Description of Control Devices

(4) Travel levers and pedals

The travel levers control the traveling of the machine.

• If the blade is in the reverse direction, the travel

levers should also be operated in reverse for for-
ward and backward travel.
• When operating the travel levers, you must
check to see if the blade is in the normal position
or in the reverse position. Note that the blade is
in the normal position when the sprocket is on
the rear side.

When the blade is in the normal position:

Forward : Push the travel lever forward.
Step on the front side.
Reverse : Pull the travel lever backward.
Forward
N : Neutral...The machine stops.

Front Rear

(5) Accelerator lever

The accelerator lever controls the engine speed (output).
(A) Idling : Push the lever forward fully.
(B) Run : Pull the lever backward fully.

(6) Blade lever

Use this lever to control the blade.

IMPORTANT
The blade lever is not locked by setting the lock lever
to the lock position. Do not touch the blade lever when
not operating the blade.

(A) : Down : Push the lever forward.

(B) : Up : Pull the lever backward.
N : Neutral...When released, the lever will return to the
neutral position and the blade is held as it is.

2-12
 12. Description of Control Devices

(7) P.T.O. pedal

Use this pedal to control the attachment.
Refer to Section "13-21. Handling hydraulic P.T.O.".

(8) Boom swing pedal

Use this pedal to swing the boom to right and left.
(A) : Swing right : move to the right
(B) : Swing left : move to the left
N : Neutral...When released, the pedal will return to the
neutral position and the boom is held as it is.

(9) Pedal guard (foot rest)

The boom swing pedal and the P.T.O. pedal have respec-
tive pedal guards.

To avoid bodily injury, securely place the pedal

guard in the lock position when the boom swing or
P.T.O. pedal is not being operated.

Placing each pedal guard in the lock position covers the

boom swing pedal and the P.T.O. pedal.
To prevent misuse, always set the pedal guard in the lock
position when the boom swing pedal or the P.T.O. pedal is
not being operated. These pedal guards can be used as
foot rests.

(10) High-speed pedal

Step on this pedal to control the travel speed. Step on the
pedal while the travel levers are in operation to increase
the travel speed.

IMPORTANT
Do not travel at high speed for many hours.
Do not step on the pedal while operating the blade.

2-13
12. Description of Control Devices

12-4. Engine hood rear cover

Do not open the engine hood while the engine is

running. Rotating fan and fan belt and high temper-
ature components can cause personal injury.
Check and service the inside of the engine hood
after the engine stops.

(1) Opening the engine hood rear cover

1) Insert the starter switch key and turn counterclockwise
to unlock.
2) Pull the engine hood rear cover lever to release thelock,
and then the engine hood rear cover opens.
3) The engine hood rear cover fully opens to be locked
with the stopper.
(2) Closing the engine hood rear cover
1) Lift up the engine hood rear cover slightly and push the
rod to disengage the lock.
2) Close the engine hood rear cover and press it down ful-
ly until it clicks.
3) Turn the starter switch key clockwise and engage the
lock.

12-5. Storage space for the operation & maintenance manual

Storage space for the operation and maintenance manual

is under the operator’s seat.
Pull the lever and open the cover.
The storage space for the operation and maintenance
manual is on the upper side of the compartment.
Press the cover until it clicks when closing.

2-14
 12. Description of Control Devices

12-6. Operator’s seat

• Be sure to adjust the seat slide to obtain the best

operating position whenever you start operation
or a new operator begins to operate the machine.
• Do not place any objects within the moving area
of the operator’s seat.
• Do not adjust the operator’s seat while operating
the machine.

Adjust the seat so that the operator can easily operate the
control levers in good posture.

„ Seat position control adjustment

(forward and backward)
Pull the slide lever (A) under the seat upward to slide the
seat forward or backward.
Adjustable amount :
3.54 in. (90 mm)
The adjustable amount of the seat for forward and back-
ward sliding is 3.54 in. (90 mm)
And the seat can be adjusted at any of the 9 levels within
3.54 in. (90 mm) (A)

2-15
12. Description of Control Devices

12-7. Headlight

The headlight gets hot when it is turned on. Do not

touch it carelessly with your bare hand to prevent
burns.

2-16
 12. Description of Control Devices

12-8. Fuse

• When replacing the fuse, be sure to turn off the pow-

er by setting the starter switch at the OFF position.
• Using a wire, aluminum foil or the like instead of the
fuse could cause burnouts of the gauges, the elec-
trical equipment and the wiring due to overheating.
• If a new fuse is blown out immediately after replace-
ment, there may be a problem with the electrical sys-
tem. Ask the nearest dealer for check and service.

The fuse protects the electrical equipment and wiring from

becoming overheated. If the fuse is corroded with white
deposits or if the fuse is loose in the holder, the fuse must
be replaced with a new one.

„ Position of the fuse box

Fuse box is on the front of sheet mount.

„ Replacing the fuses

If the electrical equipment does not operate, the fuse may
have been blown out. Follow the procedure below:
1) Set the starter switch at the “OFF” position.
2) Remove the fuse box cover.
3) If the fuse is blown out, replace it with a spare fuse of
rated capacity.
Symbol Fuse capacity Circuit name
A 15 A Heater, Wind washer
B 30 A -
Indicator box light, Horn
C 15 A Boom light, Headlight
High-speed travel valve
D 15 A Heater relay, Wiper
Timer, Safety relay
E 15 A Fuel feed pump
Engine stop solenoid, Generator
F 15 A Indicator box, Cut off valve, Buzzer
G 5A Radio <AYR modify>
H 5A
I 30 A Spare fuse
J 15 A

2-17
12. Description of Control Devices

12-9. Windshield (for cabin)

• To avoid bodily injury while operating the ma-

chine, make sure the door and windshield are
locked in either the open or shut position.
• When the side door or the windshield is opened
and it is not securely locked, it may be closed
suddenly on impact during operation. It may
cause bodily injury : for example, your hands are
put between the door or the windshield and the
cabin frame or your head is hit against them.
• Do not out your hand or head out of the opened
side door or windshield. When opening the side
door or the windshield, lock it securely.

Upper windshield

Wiper
Side door

Lower windshield

Both the upper and lower windshields can be

opened and closed.
When housing or closing the upper and / or lower
windshields, they may get down suddenly. To pre-
vent this, lock them securely with the lock levers.

2-18
 12. Description of Control Devices

• To avoid bodily injury, securely grasp the han-

dles with both hands when opening and closing
the windshield.
• Securely lock the windshield using the lock le-
vers and the window locks when storing or clos-
ing the upper and lower front windshields.
• When opening or closing the front windshield, be
sure to place the lock levers securely in the lock
position.

„ Opening the upper windshield (A)

(A)
1) Hold the handles with your hands and push the right
and left lock levers (A) to the arrowed direction to re-
lease the lock. Handle

2) Slide the windshield to the upper rear side while pulling

it to this side.
Push
(A)
3) Slide the front windshield to the storage position under
the ceiling and push it up until it is securely locked with
a click.

„ Closing the upper windshield

1) Hold the handles with your hands and release the right
and left lock levers (A).

2) Slowly lower the front windshield by grasping the han-

dles.

3) Push the front windshield forward until it is locked with

(A)
a click.

2-19
12. Description of Control Devices

„ Opening and closing the lower windshield

Push Lever

Open and close the lower windshield after housing

the upper windshield.
Lever Lock position
Lower
1) Hold the lower windshield with both hands to lift it up. windshield

2) Put the lower windshield in the storage area on the rear

left of the cabin.
3) Lock the lower windshield securely by pressing it
against the window locks (D). Upper windshield

4) Push the upper side of each window lock (D) to remove

the windshield put in storage.
Lower windshield
5)

12-10. Air outlet (for cabin)

The wind direction is adjusted by changing the grille direc-

tion.
Move the grille to the desired position with a knob in the
center of the grille.

12-11. Ash tray (for cabin)

Ash tray

Do not place any combustible matter in the ash tray.

Open the ash tray by pulling the lid to use it. Be sure to
close the ash tray lid when it is not in use. Open

When cleaning the ash tray, remove it by pressing down

and pulling it toward you. To install the ash tray, press it into
place, keeping it level.
2-20
 12. Description of Control Devices

12-12. Right window glass (for cabin)

1) Open the window by sliding the glass on each side in
the direction indicated in the figure at the right.
2) Tighten the slide stopper to fasten the glass at that po-
Slide stopper
sition.
Loosen
3) When closing the window, loosen the slide stopper.
Tighten

12-13. Cabin side door

12-13-1. Opening and closing the cabin side door

(1) From outside. Unlock
1) Turn the starter switch key counterclockwise to unlock
Lock
the side door. Key
2) Push the button of the outer handle and pull the outer Inner
handle Outer
handle to open the side door. handle
3) Close the side door and turn the key clockwise to lock
to door.

(2) From the inside.

1) Pull the inner handle to open the side door.

12-13-2. Door lock

The door look is used to hold the side door open. (1)
1) Press the side door into the lock section to hold it open.
2) Press the lever (1) on the left side of the seat down to
release the locked side door.

12-14. Replenishment of windshield washer fluid

1) Add windshield washer fluid, if necessary, to the reservoir.

• When you add the reservoir with windshield washer

fluid, take care not to enter dust into the reservoir.
• Determine the mixing ratio of the windshield Reservoir
washer fluid to water on the basis of the lowest
past temperature

2-21
 13. Operating Instructions

13-1. Checking before starting the engine

13-1-1. Walking check (visual inspection) around the machine

• If there are any combustibles in any heat build-

up areas, or if there are any fuel and/or oil leaks,
a fire can result.
• Check for possible fire causes carefully. If there
is anything abnormal, be sure to take corrective
action or contact your dealer.

Before starting the engine, visually check the outside and underside of the machine as follows:
Check bolts and nuts for loose connections; check the fuel, oil, and water for leaks; and also check the
implement and the hydraulic system to see that they are operating properly. In addition, check the elec-
trical wiring for loose connections and for dust deposits in the heat build-up areas.
Check the following points before initial start-up for the day.

(1) (5) (4) (7) (8) (2)(3) (1)

(7) (6)

(1) Checking the implement, hydraulic cylinders, linkages, and hoses for damage, wear and
loose connections
Check the implement, hydraulic cylinders, linkages, and hoses for damage, wear and loose connections.
If any abnormality is found, take corrective action.
2-22
 13. Operating Instructions

(2) Removing dust deposits from around the engine, battery, and radiator
Check that there are no dust deposits around the engine or on the radiator, and that there are no com-
bustibles (dead leaves, twigs, etc.) in the heat build-up areas, such as the engine muffler, or around the
battery. If there are any, remove them.

(3) Checking the engine and its accessories for oil or water leakage
Check the engine for oil leakage and the cooling water system for water leakage.
If oil or water leakage is found, take a corrective action.

(4) Checking the hydraulic system, hydraulic oil tank, hoses, and joints for oil leakage
Check for oil leakage. If oil leakage is found, take corrective action.

(5) Checking the grease piping for grease leakage

Check for grease leakage or ooze. If grease leakage or ooze is found, take corrective action.

(6) Checking the undercarriage (crawler, sprockets, and idlers) for breakage, wear, loose bolts,
and oil leakage around the rollers
If any breakage or wear is found, correct it. Retighten the bolts if necessary.
If oil leakage is found, take corrective action.

(7) Checking the handrails and steps for breakage and loose bolts.
If any breakage is found, take corrective action. Retighten the bolts if necessary.

(8) Checking the gauges and the monitor for breakage and loose bolts
Check the gauges and the monitor for breakage and loose bolts. If any abnormality is found, replace the
gauge or the monitor with a new one, or retighten the bolts if necessary. Clean the surfaces of the gauges
and monitor.

(9) Checking the fuel filter to see whether the red ring has sunk down at the cup bottom
If the red ring has sunk down at the cup bottom, no water has mixed into the oil; if the red ring is floating
in the cup, water is mixed into the oil under the red ring. In this case, take out the cup to remove the water.
Refer to Section "25-4-4. Cleaning the fuel filter element" for the removal and reinstallation procedure of
the cup.

2-23
13. Operating Instructions

13-1-2. Checking before start-up

Check the following points before initial start-up for the day.

„ Checking and replenishing the cooling water

Normally do not open the radiator cap.

Check the cooling water in the sub-tank when the
engine is cool.

1) Open the engine hood rear cover. Then check that the
cooling water lever in the sub-tank (1) (illustrated in the
right figure) is between the FULL and LOW marks. If the
water level is below the LOW mark, refill the sub-tank up
to the FULL mark through the water supply port of the
sub-tank (1).
For the quality of cooling water to be used, refer to Sec-
tion "21. Fueling, Oiling and Greasing Based on Tem-
perature Range".
2) After replenishing, securely tighten the radiator cap.
3) If the sub-tank is empty, check it for water leakage, and
then, check the water level in the radiator.
If the water level is low, refill the radiator first, then refill
the sub-tank.
4) If the cooling water level is appropriate, close the en-
gine hood rear cover.

2-24
 13. Operating Instructions

„ Checking and replenishing the engine oil

• At operating temperature, the oil and dipstick ar-

eas are hot.
• Do not allow hot oil or components to contact the
skin to prevent bodily injury such as a burn.
Check oil level and refill oil after engine has
cooled down sufficiently.

1) Open the engine hood rear cover and securely lock it

with the stopper.

2) Pick up the dipstick (G) and wipe it with a rag to remove

oil deposits.

3) Insert the dipstick (G) into the dipstick tube fully, then
draw it out.
4) If the dipstick (G) is wet above the midpoint between the
H and L marks, the engine oil level is appropriate. If the
oil level is below the midpoint between the H and L
marks, supply engine oil through the oil supply port (F).
For the quality of the engine oil to be used, refer to Sec-
tion "21. Fueling, Oiling and Greasing Based on Tem-
perature Range".

5) If the engine oil level is above the H mark, remove the

excessive amount of oil through the drain plug (P), then
recheck the engine oil level.

6) After verifying that the amount of engine oil is appropri-

ate, securely retighten the oil supply port cap and close
the engine hood rear cover.

Note :
When checking the engine oil level after starting up the en-
gine, stop the engine and allow more than 15 minutes for
the engine to cool down.
If the machine is slanted, reposition the machine to ensure
it is level before checking the engine oil level.
Keep in mind that the excess engine oil must not be dis-
posed of on the ground or the road.

2-25
13. Operating Instructions

„ Checking the fuel level in the fuel tank and refueling

Be careful not to overfill the fuel tank because it

could cause a fire. If the tank is overfilled, com-
pletely wipe off the spilled fuel.

• Do not remove the strainer from the fuel supply

port of the fuel tank to refill the tank.
• Be careful not to allow water settled at the bot-
tom of the fuel container or dirt on refueling
equipment to enter into the fuel tank.

1) Turn the starter switch to the “ON” position, and check

the fuel level with the fuel gauge. Open the engine hood
B, and supply fuel from the fuel supply port.

When the fuel gauge pointer indicates “E”, approxi-

mately 1.45 Gals. (5.5 L) of fuel is left in the tank.

Capacity : 7.52 Gals. (28.5 L)

For the quality of the fuel to be used, refer to Section

"21. Fueling, Oiling and Greasing Based on Tempera-
ture Range".

2) After refueling, securely retighten the fuel supply port

cap, and close the engine hood B.

Note :
If the breather hole (1) in the cap is clogged, the pressure
in the tank may decrease and the fuel may not be supplied
adequately to the engine. Clean the engine breather hole
from time to time.

2-26
 13. Operating Instructions

„ Checking and replenishing the hydraulic oil tank

When removing the plug of the oil supply port,

slowly loosen it to release the pressure in the tank
to prevent a dangerous high-pressure leak.

1) Park the machine as illustrated in the right figure.

When the machine is not in the posture in the right fig-
ure, start the engine, retract the bucket and arm cylin-
ders to their stroke ends at low speed, lower the boom
until the bucket teeth is placed on the ground, lower the
blade to the ground, and stop the engine.

2) Check the oil level with the oil level gauge on the right
side of the machine. Check that the oil level is between
the upper and lower limit marks.

IMPORTANT
Do not replenish hydraulic oil above the upper limit
mark on the oil level gauge. An excessive amount of
hydraulic oil may damage the hydraulic system by
placing stress on its components, causing a danger-
ous high-pressure leak.

3) Open the engine hood B and replenish oil from the oil
supply port if the oil level is below the lower limit.

For the quality of the oil to be used, refer to Section "21.

Fueling, Oiling and Greasing Based on Temperature
Range".

Note :
Note that the oil level varies with the oil temperature. When
reading the oil level, follow these guidelines:
• Before start-up, the oil level gauge should read the level
around the midpoint of the gauge scale
[oil temperature : 50 to 86°F (10 to 30°C)].
• During normal operation, the oil level gauge should read
the level around the upper limit mark of the gauge scale
[oil temperature : 122 to 176°F (50 to 80°C)].

2-27
13. Operating Instructions

„ Checking and adjusting the fan belt tension

1) Open the engine hood rear cover.

2) Press down the fan belt between the fan pulley and the
generator with a finger to check the fan belt tension.
Pressing load : Approximately 22.1 lbs. (10 kgf)
Adequate slack : 0.39 to 0.59 in. (10 to 15 mm)

3) Adjust the tension if necessary.

Refer to Section "25-6. Maintenance every 200 service
hours" for the adjustment procedure.

4) When the tension is proper, close the engine hood rear

cover.

„ Checking and replenishing the battery electrolyte

• The battery generates flammable gas and it can

cause a fire and an explosion.
Keep sparks or flames such as lit cigarettes
away from the battery.
• Battery electrolyte is a strong acid. To avoid se-
rious injury, do not allow the electrolyte to con-
tact skin or splash into the eyes.
• Always wear safety goggles and protective
clothing.

1) Open the engine hood B to check the electrolyte level

and discharge state of the battery with the indicator on
the battery.

How to see the indicator:

(Blue) : Normal

(Red) : Shortage of battery electrolyte.

: Replenish distilled water.
(White) : Shortage of battery charge.
: Recharge the battery.

2-28
 13. Operating Instructions

„ Greasing „ Implement

IMPORTANT
Grease the fittings thoroughly after washing the ma-
chine or after operation in rain, on soft ground, or in
muddy water.

1) Put the bucket and the blade on the ground and stop the
engine.
2) Clean the grease nipples indicated with the arrows in
the right figures and grease them using a grease gun.
3) After greasing, wipe off the excessive grease with
waste cloth or the like.

„ Blade

2-29
13. Operating Instructions

„ Checking the electrical equipment

Whenever a fuse blows out frequently, contact

your dealer for the cause and repair.

Check fuses for damage, wiring for poor connections or

short circuits, and battery terminals for corrosion or loose
fits. Take corrective action.

Check the following items after the starter switch is turned

to the "ON" position.

1) Check the monitor functions

• Check the fuel gauge, the water temp. meter and the
hourmeter function.
• Check engine oil pressure alarm lamp, battery charge
alarm lamp and water temperature alarm lamp for light-
ing.

2) Check that all switches function correctly and lamps

light correctly.
• Operation of the headlight and the boom light.

2-30
 13. Operating Instructions

13-1-3. Operating and checking instructions before

starting up the engine (1) (1)

• Accidentally operating a control lever can cause

the machine to move suddenly, possibly causing
a serious accident. (2)
• When leaving the operator's seat, be sure to
place the lock levers securely in the lock posi-
tion.

1) Check that the lock levers (1) are in the lock position.

2) Check that all other levers are in their appropriate posi-

tions.

3) Fasten the seatbelt snugly.

4) Insert the key into the starter switch (2) and set it to the
"ON" position. Then check the following points:

[1] The buzzer will sound, and the following alarm lamps
will go on.
• Engine oil pressure alarm lamp (3)
• Battery charge alarm lamp (4)
• Water temp. alarm lamp (5) (turns off in 2 to 3 seconds)

If any of the alarm lamps does not go on or the buzzer does

not sound, it may mean that the alarm lamp has blown out
or the wire is broken. In this event, ask the dealer for repair.

[2] Position the light switch to "ON" whether the head light
and boom light will go on. If they do not go on, the lamp
might have blown out or the wire might be broken. In
this event, ask the dealer for repair.

2-31
13. Operating Instructions

13-2. Starting up the engine

13-2-1. Normal start-up

• First check to see that there are no people or ob-

stacles around the machine.
Then sound the horn and start the engine.
(1) (2)
• Be sure that you are seated in the operator's seat
when starting the engine.
• When starting the engine in an enclosed place,
be sure that there is adequate ventilation so that
the exhaust gases can escape.

1) Pull the accelerator lever (1) back to the "RUN" position.

2) Set the key in the starter switch (2) to the "START" po-
sition. The engine will start.

3) After the engine has started, leave the key in the starter
switch (2).

4) The key will return to the "ON" position by itself.

Note :
When the engine is warm, the engine can start up even if
the accelerator lever is left in the "IDLING" position.

IMPORTANT
To protect the starter motor and the battery:
• Do not keep the key in the "START" position for
more than 10 seconds.
• If the engine fails to start, do not attempt to start the
engine immediately again, but set the switch to the
"OFF" position and wait for approximately 30 sec-
onds, then start the engine again.

The swing motor with a brake is used. The brake of the

swing motor is released when the engine starts.
2-32
 13. Operating Instructions

13-2-2. Starting the engine in cold weather

• First check to see that there are no people or ob-

stacles around the machine.
Then sound the horn and start the engine.
• Be sure that you are seated in the operator's seat
when starting the engine.
• When starting the engine in an enclosed place,
be sure that there is adequate ventilation so that
(1) (2)
the exhaust gases can escape.

To start the engine at a low outside air temperature, follow

the steps below:
1) Pull the accelerator lever (1) back to the "RUN" position.

2) Turn the key in the starter switch (2) to the "AIR HEAT-
ER" position and keep it there for approximately 10 to
15 seconds to preheat the intake air of the engine.

3) Turn the key in the starter switch (2) to the "START" po-
sition to start the engine.

4) After the engine has started, leave the key in the starter
switch (2).
The key will return to the "ON" position by itself.

2-33
13. Operating Instructions

5) When the engine speed has increased, push the accel-

erator forward to the "IDLING" position immediately.

IMPORTANT
To protect the starter motor and the battery:
• Do not keep the key in the "START" position for
more than 10 seconds.
• If the engine fails to start, do not start the engine im-
mediately again, but set the switch to the "OFF" po-
sition and wait for approximately 30 seconds, than
start the engine again.
• Traveling or operating the machine without ade-
quate warming up in cold weather may adversely af-
fect the machine performance, which causes low
operating speed or traveling with deviation.

2-34
 13. Operating Instructions

13-3. Operating and checking instructions after starting the engine

• Emergency stop.
If abnormal operation occurs, turn the starter
switch key to the "OFF" position, to stop the
electrical system and the engine. Then ask your
dealer to check the machine.
• Be sure to warm up the engine. If you operate the
implement without full warm-up, the machine
may not respond or operate properly.
Especially in cold weather, fully warm up the en-
gine.

IMPORTANT
• The proper hydraulic oil temperature is between
122°F and 176°F (50°C and 80°C).
If you have to operate the machine at a low hydraulic
oil temperature, increase the hydraulic oil temperature
to about 68°F (20°C) before operating the implement.
• In the event that you have to operate any control le-
(1)
ver at a temperature of lower than 68°F (20°C), oper-
ate it gently.
• Do not accelerate the engine rapidly until the engine
warms up.

After starting the engine, do not start operating the ma-

chine immediately but follow this procedure:

1) Idle the engine to check that the engine oil pressure

alarm lamp is off.

2) Pull the accelerator lever (1) to the midpoint between

the "IDLING" and "RUN" positions, and run the engine
with no load at medium speed for approximately five
minutes.

2-35
13. Operating Instructions

3) Unlock the lock levers, and lift the bucket from the
ground.

4) Operate the bucket and arm control levers slowly to

move the bucket and arm cylinders to their stroke ends.
Operate the bucket for thirty seconds and the arm for
thirty seconds alternately for approximately five minutes
to increase the hydraulic oil temperature to 68°F (20°C).

IMPORTANT
When moving the implement, be careful not to bump it
against the machine or the ground.

5) After warming up the engine, check that the gauges and

the monitor are in the following status. If there is any-
thing abnormal, take corrective action.
• Fuel gauge (1)..................................................... Normal
• Water temp. meter (2) ......................................... Normal
• Hourmeter (3)...................................................... Normal
• Engine oil pressure alarm lamp (4) ............................Off
• Battery charge alarm lamp (5)....................................Off
• Water temperature alarm lamp (6) .............................Off

6) Check the exhaust gas color, the machine noise, and

the vibration level for abnormality. If something is abnor-
mal, take corrective action.

7) Set the lock levers to the "LOCK" position to check that the
implement cannot be operated and the upperstructure
cannot be swung with the left and right control levers.

8) Unlock the lock levers and operate the control levers to

check that the implement can be operated and the up-
perstructure can be swung normally with the control le-
vers. If something is abnormal, take corrective action.

9) Check to see that the swing brake valve operates nor-

mally. If something is abnormal, take corrective action.

10) Check that no abnormal noise is heard from the hy-

draulic system. If any abnormal noise is heard, take
corrective action.

Ask your dealer to resolve the problems described in the

steps 1) to 10) above.

2-36
 13. Operating Instructions

13-4. Traveling
13-4-1. Traveling forward

(2) (2)
• Always check the position of the blade before
operating the travel levers.
When the blade is in the rear, the travel levers op- (4)
erate in the reverse of the normal operation. (3)
(1)
• A signal person should be in attendance to give
signals at sites which are dangerous or not clear-
ly in view of the operator.
• Clear all people from the working area.
• Sound the horn before beginning travel, to alert
the people near the machine.
• Clear obstacles from the path of the machine.
• Do not operate the travel levers rapidly while the
engine is running at high speed. Otherwise, the
machine may move unexpectedly, causing a se-
rious accident.

1) Pull the accelerator lever (1) back to the "RUN" position

to increase the engine speed.

2) Unlock the lock levers (2), and retract the implement to

lift it 15.75 to 19.69 in. (40 to 50 cm) above the ground.

3) Pull back the blade lever (3) to lift the blade.

2-37
13. Operating Instructions

4) Operate the left and right travel levers (4) as follows:

• When the blade is in the front of the machine;
Slowly push the travel levers (4) forward to move the ma-
chine forward.

• When the blade is in the rear of the machine;

Slowly pull the travel levers (4) back to move the ma-
chine forward.

13-4-2. Traveling in reverse

• Always check the position of the blade before (2) (2)

operating the travel levers.
When the blade is in the rear, the travel levers op-
erate in the reverse of the normal operation.
(4)
• A signal person should be in attendance to give
(3)
signals at sites which are dangerous or not clear- (1)
ly in view of the operator.
• Clear all people from the working area.
• Sound the horn before beginning travel, to alert
the people near the machine.
• Clear obstacles from the path of the machine.
• There is a blind spot behind the machine. Make
sure that no people are in the blind spot before
traveling backwards.
• Do not operate the travel levers rapidly while the
engine is running at high speed. Otherwise, the
machine may move unexpectedly, causing a se-
rious accident.

1) Pull the accelerator lever (1) back to the "RUN" position

to increase the engine speed.

2-38
 13. Operating Instructions

2) Unlock the lock levers (2), and retract the implement to

lift it 15.75 to 19.69 in. (40 to 50 cm) above the ground.

3) Pull back the blade lever (3) to lift the blade.

4) Operate the left and right travel levers as follows:

• When the blade is in the front of the machine;
Slowly pull the levers back to move the machine back-
ward.

• When the blade is in the rear of the machine;

Slowly push the levers forward to move the machine
backward.

2-39
13. Operating Instructions

13-5. Steering
13-5-1. Steering (Turning the machine)

Always check the position of the blade before op-

erating the travel levers.
When the blade is in the rear, the travel levers op-
erate in the reverse of the normal operation.

To steer the machine, operate the travel levers.

Do not turn the machine too sharply. Before spin-turning,
stop the machine.
Operate the two travel levers (1) as follows:
(1)

„ Steering the machine when it is not traveling

To turn left, push the right travel lever forward and start
traveling forward on the left. Pull the right travel lever back
and start traveling in reverse on the left.

Note :
To turn right, operate the left travel lever in the same man-
ner as above.

„ Steering the machine while traveling (the left and

right travel levers are both tilted in the same direc-
tion)
To turn left, return the left travel lever to the neutral posi-
tion.

Note :
To turn right, operate the right travel lever in the same
manner as above.

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 13. Operating Instructions

„ Spin-turning the machine when it is not traveling

To spin-turn left, push the right travel lever forward while
pulling the left travel lever back.

Note :
To spin-turn right, push the left travel lever forward while
pulling the right travel lever back.

2-41
13. Operating Instructions

13-6. Stopping the machine

Do not stop the machine suddenly but provide a

safety margin.

• Park on solid, level ground.

• Do not park on a slope. If it is unavoidable to park on a
slope, put solid pieces of wood under the crawler as
blocks, place the blade on the ground, and dig the
bucket into the ground.

• Do not touch the control levers accidentally. Oth-

erwise, the implement or the machine may move
unexpectedly, causing serious bodily injury.
• Whenever leaving the operator's seat, be sure to
place the lock levers securely in the lock position
and remove the starter switch key.

1) Set the right and left travel levers (1) to the neutral po-
sition to stop the machine.

(1)

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 13. Operating Instructions

13-7. Swinging the upperstructure

Before swinging, make sure that there are no peo-

ple or obstacles within the swing range of the im-
plement or the machine tail.

1) To swing the upperstructure, operate the left control le-

ver as illustrated in the right figure.
(A) : Swing right
(B) : Swing left

2-43
13. Operating Instructions

13-8. Operating the implements

• Check the area around the machine for safety

and sound the horn before beginning to operate
the machine.
• According to the switching of pattern change le-
ver, control lever operation can be chosen in two
patterns.
• To prevent accidental injury, never operate Exca-
vator before confirming location of pattern
change lever.

Operate the machine using the right and left control levers,
the boom swing pedal and the blade lever.

• Control lever (L) : Operates arm and upperstructure swing.

• Control lever (R) : Operates boom and bucket.

• Boom swing pedal : Operates boom swing.

• Blade lever : Operates blade.

The relation between the operation of the levers and the

boom swing pedal, and the movement of the implement
are shown in the illustration on the right.
On releasing the levers and the boom swing pedal, they re-
turn to the neutral position and the implement will stop as
they are.

2-44
 13. Operating Instructions

13-9. Precautions for operating the implement

• Do not operate the implement control levers

while traveling. Stop traveling first and then op-
erate the implement.
• Do not operate the implement on a rocky surface
(on hard and soft rocks).

„ Do not use the implement's swing force

Do not level the ground or break down a wall by the use of
swing force, and do not dig the bucket teeth into the
ground while swinging. Doing these may cause the imple-
ment to be damaged.

„ Do not use the implement's travel force

Do not excavate the ground by the use of travel force with
the bucket teeth in contact with the ground. Doing this may
cause excessive force to be imposed on the rear of the ma-
chine, shortening the machine life.

„ Take care not to operate the hydraulic cylinder to

the stroke end.
Margin
Operating the hydraulic cylinder to the stroke end may im-
pose an undue force on the stopper in the hydraulic cylin-
der, shortening the implement life. Operate with a small
safety margin.

„ Do not operate the implement by the using the

dropping force of the bucket
Do not excavate the ground by using the dropping force of
the bucket as a pickaxe or pile driver. Doing this may cause
excessive force to be imposed on the rear of the machine,
shortening the machine life and possibly causing a serious
accident.

2-45
13. Operating Instructions

„ Do not operate the implement by using the drop-

ping force of the machine
Do not excavate the ground by using the dropping force of
the machine.

„ Excavating a hard rock

It is recommended that a hard rock first be broken into
small pieces by other means. Doing so will prevent dam-
age to the machine and will increase economy.

„ Do not suspend a load unless you use a hooked

bucket
Suspending a load safety requires the use of a hooked
bucket. Refer to Section "28. Handling the Hooked Buck-
et".

2-46
 13. Operating Instructions

„ Do not bump the blade against a large rock or boul-

der
Do not bump the blade against a large rock or boulder. Do-
ing so may cause the blade or the hydraulic cylinder to be
damaged.

„ Be careful when retracting the implement

When retracting the implement for travel or transport, be
careful that the bucket and the blade never bump against
each other.

„ Support the blade on both sides

When you use the blade as an outrigger, support the blade
on both sides.

„ Be careful not to bump the blade when excavating

When excavating the ground with the blade in front, never
let the blade bump against the boom cylinder.
Place the blade in rear, if it is not being used.

2-47
13. Operating Instructions

13-10. Precautions for working

„ Precautions for traveling

Driving over a stone or a stump subjects the machine (es-
pecially undercarriage) to a shock, which may cause dam-
age to the machine.
Avoid such obstacles by driving around them, or removing
them.
If driving over them is unavoidable, reduce speed, hold the
implement close to the ground, and drive over the obsta-
cles with the center of the track shoes.

„ Allowable water depth

IMPORTANT
When driving out of water, if the machine climbs a
slope at an angle of more than 15 degrees, the rear of
the upperstructure may submerge too deeply in the
water, which may damage the radiator fan since the ra-
diator fan paddles the water. Avoid this if possible
when driving out of water.

The limit of the water depth in which the machine can be

used in is up to the center of the shoe slide plate.
Apply a generous amount of grease to the moving parts
(especially bucket pin) that have been submerged in the
water for a long time until the used grease is extruded out
of the bearings.
Wipe the extruded used grease off with a waste cloth.

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 13. Operating Instructions

13-11. Precautions for going up and down a slope

• When traveling on a slope, raise the bucket 7.87

to 11.81 in. (20 to 30 cm) above the ground.
Do not go down a slope backwards.
• When driving over obstacles such as footpaths,
hold the implement close to the ground and drive
the machine slowly.
• Never turn on or traverse a slope.
Descend to a flat ground to make a course change.
• If the machine is starting to slip or you feel that
the machine is unstable, place the bucket on the
ground and stop the machine at once.
• Be careful that the machine may roll over when
swinging the upperstructure or operating the im-
plement on a slope.
Do not swing the upperstructure toward the down-
ward side of the slope with a load in the bucket.
If swinging is unavoidable, first lay earth on the
slope to maintain the machine as horizontal as
Earth laid
possible, then swing the upperstructure. on the
ground
• Do not travel on a slope of 20 degrees or more,
as the machine may upset.

1) Go down slopes at low speed, using the travel levers

and accelerator lever to control your speed.
When going down a slope, drive the machine at low en-
gine speed and position the implement as shown in the 90 degrees to
110 degrees
right figure.

7.87 to 11.8 in. (20 to 30 cm)

2) When climbing a slope, drive the machine with the im-

plement positioned as shown in the right figure.
90 degrees to
110 degrees

7.87 to 11.8 in.

(20 to 30 cm)

2-49
13. Operating Instructions

„ Braking when going down a slope

When going down a slope, you can automatically brake the
machine by setting the travel levers to the neutral position.

„ When the crawler is slipping

If you cannot climb a slope by operating the travel levers
because the crawler is slipping, retract the arm and make
use of the pull-back power of the implement to climb the
slope.

„ When the engine stops

If the engine stops while climbing a slope, set the travel le-
vers to the neutral position, stop the machine, and restart
the engine.

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 13. Operating Instructions

13-12. Escaping from the mud

Carefully operate the machine not to allow it to get mired
in mud. If the machine is mired in mud, the machine can
escape as follows:

13-12-1. If only one track is mired in the mud

If only one track is mired in the mud, place the bucket on
the muddy side, lift the track above the ground, lay a log or
a wood block under the track shoe, and raise the bucket to
escape.

IMPORTANT
When lifting the machine above the ground with the
boom or the arm, press on the ground with the bottom
of the bucket. (Do not press on the ground with the
bucket teeth.)
In doing this, the angle between the boom and the arm
should be 90 degrees to 110 degrees.
The same manner as above should be applied when
the bucket is in the reverse position.

13-12-2. If both tracks are mired in the mud

If both tracks are mired in the mud, lay a log or a wood
block under the track shoes in the same manner as men-
tioned above, dig the bucket into the solid ground, retract
the arm just as when excavating, and set the travel lever to
the "FORWARD" position to escape from the mud.

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13. Operating Instructions

13-13. Operations using the bucket

You can greatly widen the range of work described here by
using optional attachments.

13-13-1. Backhoe operation

Backhoe operation is suitable for digging the ground below
the machine.
Suppose that the machine is operating as illustrated in the
right figure : a maximum digging force of each cylinder can
be obtained when the angle between the bucket cylinder
and the bucket arm as well as between the arm cylinder
and the arm is maintained at 90 degrees.
When digging, make good use of this angle to increase the
operating efficiency.
To excavate the ground efficiently by manipulating the arm,
the arm needs to be operated within a range of angles be-
tween 45 degrees forward and 30 degrees backwards, as
illustrated in the right figure. Though the range differs ac-
cording to the depth of the work, do not move the imple-
ment to the cylinder stroke end.

13-13-2. Ditching
To increase work efficiency, install a suitable bucket for
ditching and position the tracks in parallel with the ditch to
be made.
To make a wide ditch, first dig the two sides, and then dig
the center.

13-13-3. Loading
To increase work efficiency, locate the dump truck at a po-
sition where the swing angle of the machine will be mini-
mized and the operator can clearly view the dump truck.
Load earth from the rear of the dump truck, because it can
be loaded more easily and in larger amount than from the
side.

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 13. Operating Instructions

13-14. Replacing the bucket

• When driving pins into the bucket with a ham-

mer, metal chips may fly. If metal chips should
get into your eyes, they can cause serious injury.
Use goggles, a hard hat, and gloves for safety
when replacing the bucket.
• After removing the bucket, place it stably on sol-
id ground.
• When aligning the holes for pin A and pin B, be
careful not to insert your fingers into those holes
to prevent serious injury to your fingers. Visually
check the alignment of the holes.

Work on level ground with good footing. If two or more per-

sons work together, communicate with signals selected
beforehand for safety.

„ Replacement procedure
Replace the bucket according to the following procedure:

1) Park the machine on level, flat ground, and lower the

bucket onto the ground.

2) Stop the engine.

3) Clean around the bucket pin to prevent foreign material

from entering.

4) Remove pins A and B.

IMPORTANT
• Keep the pins away from dirt or mud.
• The machines have dust seals on either end of the
bushing. Be careful not to damage them.

2-53
13. Operating Instructions

5) Clean the bucket boss section and install the O-ring.

IMPORTANT
• Check that the O-ring is not damaged. If it is dam-
aged, replace it.
• We recommend that you replace the O-ring when
you replace the bucket.

6) Connect the arm to hole (A), and then connect the link
to hole (B).

7) Install the O-ring in position.

IMPORTANT
Before mounting the bucket, clean the arm pin hole
and grease it.

8) Install the bolt into the bucket pins A and B.

9) Grease the connecting parts.

2-54
 13. Operating Instructions

13-15. Parking the machine

Do not stop the machine suddenly, but try to stop

with a safety margin.

• Park on solid, level ground.

• Do not park on a slope. If parking on a slope is unavoidable,
block the tracks with solid pieces of wood, place the blade
on the ground, and dig the bucket into the ground.

• Do not touch the control levers accidentally. Oth-

erwise, the implement or the machine may move
unexpectedly, causing a serious accident.
• When leaving the operator's seat, be sure to (1)
place the lock levers securely in the lock position
(2)
and remove the starter switch key.

1) Set the left and right travel levers (1) to the neutral po-
sition to stop the machine.

2) Idle the engine with the accelerator lever (2).

2-55
13. Operating Instructions

3) Place the bucket on the ground with its bottom surface

in contact with the ground.

4) Place the blade on the ground.

5) Set the lock levers to the "LOCK" position.

13-16. Inspection requirements after completing operation

Check the water temp. meter (1) and the engine oil pres-
sure alarm lamp (2), and also check the residual quantity
of fuel with the fuel level gauge (3).

2-56
 13. Operating Instructions

13-17. Stopping the engine

IMPORTANT
• Stopping the engine after rotation at high speed may
shorten the engine life. Do not stop the engine sud-
denly except in case of emergency.
• If the engine is overheated, do not stop the engine
immediately. Gradually lower the engine tempera-
ture by rotating the engine at medium rotational
speed before stopping the engine.

1) Idle the engine for approximately five minutes with no

load.
(The engine temperature gradually lowers.)

(1)

2) To stop the engine, turn the starter switch key (1) to the
"OFF" position.

3) Take the key out of the starter switch (1).

Note :
The swing motor with a brake is used. The brake works to
lock the swing motor when the engine stops.

2-57
13. Operating Instructions

13-18. Inspection requirements after stopping the engine

1) Check oil and water for leaks, and visually inspect the
implement, the machine, and the undercarriage by
walking around them.
If there are any leaks of oil or water, or any observed ab-
normality, take corrective action.

2) Completely fill the fuel oil tank.

3) Confirm that the engine room compartment is free of

any foreign matter.
Paper or dust in the engine room may cause fire. Re-
move them if any.

4) Remove mud adhering to the undercarriage of the ma-

chine.

13-19. Locking

Make sure to lock up the following parts :

(1) Engine hood B
(2) Engine hood rear cover

Note :
The starter switch key (1) is used to lock all of the parts
mentioned above.

(3) Side door (for cabin)

(3)
Note :
The starter switch key (1) is used to lock all of the parts
mentioned above.

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 13. Operating Instructions

13-20. Handling the rubber crawler (for rubber crawler type)

13-20-1. Using the rubber crawler properly

The rubber crawler has some advantages over the steel
crawler.
However, you cannot take full advantage of it if you use it
in the same manner as for the steel one. Take care in op-
erating with the rubber crawler according to the conditions
of the work site and the type of work.

Comparison Table of Rubber and Steel Crawlers

Rubber Steel
Low vibration ‘
Smooth travel (with no creak) ‘ c
Silent travel ‘
Less damage to paved roads ‘
Simple handling ‘
Susceptibility to damage (strength) ‘
Tractive force ‘ ‘

‘ : Excellent
c : Good
: Ordinary

Rubber crawler has many advantages inherent in the

unique properties of the material. On the other hand, how-
ever, it is low in strength. It is essential that you fully under-
stand the properties of rubber crawler, and observe the
precautions for operating and handling it to prolong its life
and get the most out of it. Sure to read Section "13-20-3.
Precautions for using the rubber crawler" before using it.

13-20-2. Warranty for rubber crawler

The rubber crawler is not warranted for free repair or re-
placement if it is damaged because of careless misuse by
the customer, including the failure to comply with the prohi-
bitions and the instructions for safe operation; for example,
failure to check the tension of the rubber crawler or service
the rubber crawler properly, or "operation of the rubber
crawler on the edge of a steel plate, a U groove, a block or
sharp rubbles and rocks, or on reinforcing bars or iron
scraps, which could physically damage the rubber crawler".

2-59
13. Operating Instructions

13-20-3. Precautions for using the rubber crawler

„ Prohibitions
Observe the following prohibitions:

• Do not operate or swing on sharp stones, a hard, uneven

rock base, or around steel rods, scrap iron, or edges of
iron plates. Failure to observe these prohibitions may
damage the rubber crawler.

• Do not operate the machine on a stony surface like a ri-

verbed. Doing this may damage the rubber crawler by
catching gravel in the crawler or may cause the crawler
to come off. Forcibly pushing obstacles with the crawler
slipped will shorten the life of the rubber crawler.

• Prevent the rubber from getting exposed to oil, fuel, or

chemical solvents. If it is exposed, immediately wipe it.
Also, do not travel on a road which has an oil pool.

• When storing the rubber crawler for a long time period

(more than three months), avoid placing it in a place sub-
ject to direct exposure to sunlight or rain.

• Do not operate the machine on heated places such as in

an open-air fire, on a steel plate exposed to the blazing
sun, or on a hot asphalt road.

• Never run on one rubber crawler track while the other is

held above the ground with the implement. Doing this
may damage the rubber crawler or cause it to come off.

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 13. Operating Instructions

13-20-4. Other precautions for using the rubber crawler

Observe the following precautions when operating the machine:

• Never spin-turn on concrete or asphalt roads.

• Do not change course suddenly. Doing this will cause the rubber track to wear early or be damaged.

• Do not swing on the ground over a large level gap. Remember that running over a level gap at a right
angle will prevent the crawler from coming off.

• Slowly lower the machine after it has been lifted above the ground with the implement.

• It is not recommended that the machine be used to handle any materials that become oily after being
crushed (e.g., soybeans, corn, rapeseed oil seeds, etc.). After unavoidably using the machine to han-
dle such materials, fully clean the machine with water.

• It is not recommended that the machine is used to handle materials such as salt, ammonium sulfate,
potassium chloride, potassium sulfate, or superbiphosphate of lime. Handling these materials may af-
fect the core metal adversely. After using the machine to handle such materials, fully clean with water.

• Do not operate the machine at the seashore. Doing this may affect the core metal adversely due to the
salt content.

• If the rubber crawler is cracked, it could be easily damaged when handling salt, sugar, wheat, or soy-
beans. Be sure to repair any cracks in the rubber crawler to prevent rubber chips from getting into the
materials being handled.

• Do not allow the rubber crawler to rub against a concrete wall.

• The rubber crawler is prone to slipping on snow or on a frozen road. Be careful of skidding when trav-
eling or operating on a slope in cold weather.

• Operating the machine in extremely cold weather will deteriorate the rubber crawler, shortening its life.

• Use the rubber crawler between -13°F to +131°F (-25°C to +55°C) because of the physical character-
istics of rubber.

• Be careful not to damage the rubber crawler with the bucket while operating the machine.

2-61
13. Operating Instructions

• Keep the crawler in appropriate tension to prevent it from coming off.

If the tension is too low, the rubber crawler may come off under the following conditions.
Even if the tension is adequate, take care when operating the crawler.

• Do not steer the machine on a large level gap created

by a curbstone or a rock [approximately more than
7.87 in. (20 cm)]. Run over a level gap at a right angle
to prevent the crawler from coming off.

• Do not steer the machine to a boundary between the

flat ground and a slope while moving backward.
If such steering is not avoidable, slow down the speed.

• Do not travel with the crawler at one end on a slope or

on convex ground (at a machine inclination angle of
approximately more than 10 degrees), with the crawler
at the other end on flat ground, to prevent the rubber
crawler from being damaged. Be sure to travel with the
crawler at both ends on the same level surface.

• The three cases illustrated above are those which

could cause the rubber crawler to loosen. In addition,
do not steer the machine under such ground condi-
tions as illustrated in the right figure.

[How the rubber crawler comes off]

1) When running over a level gap, a clearance is created
between the crawler and the track rollers. At this point,
the crawler tends to come off.

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 13. Operating Instructions

2) If the machine further travels in reverse, clearance may

also be created between the track rollers and the idler
and, the rubber crawler, causing the rubber crawler to
easily come off.

• When the machine is steered while the rubber crawler is

blocked in the transverse direction by an obstacle or the
like.

• When the idler and the track rollers are misaligned from
the core metal due to rubber crawler misalignment.

• Traveling in reverse under this condition will cause the

rubber crawler to come off.

• Steering the machine under this condition will cause the

rubber crawler to come off.

13-20-5. Checking and servicing the machine with rubber crawler

To check and service the machine with rubber crawler, re-
fer to and follow Section "24-1. Table of service time inter-
vals".

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13. Operating Instructions

13-21. Handling hydraulic P.T.O.

13-21-1. Description of stop valve, P.T.O. selector valve, P.T.O. pedal and pedal lock

(2)

(3)

(1)

(1) P.T.O. selector valve

Use this valve to change the oil flow.

2-64
 13. Operating Instructions

(2) P.T.O. pedal

Use this pedal to operate the attachment.
• Move the P.T.O. pedal to L side for operating the single
acting actuator type of attachments, when the P.T.O. se-
lector valve is in the single acting position.
[Example of the P.T.O. : Breaker]

• Move the P.T.O. pedal to L or R side for operating the

double acting actuator type of attachments, when the
P.T.O. selector valve is in the double acting position.
[Example of the P.T.O. : Tilt bucket, Clamshell, etc.]

(3) P.T.O. pedal lock (for attachment control pedal)

• Securely look the P.T.O. pedal in the neutral posi-

tion when the P.T.O operation is not required.
• If you touch the P.T.O. pedal carelessly when the
P.T.O. pedal is unlocked, it may cause serious
bodily injury.

Use this device to lock the P.T.O. pedal.

• Hand breaker position

When the P.T.O. pedal lock is moved to the right with the
P.T.O. pedal moved to the left, the P.T.O. pedal is locked.
(The lock position when operating the hand breaker, etc.).

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13. Operating Instructions

13-21-2. Hydraulic circuit

1) When mounting any attachment, follow the procedure
below to connect the circuit.
(1) Make sure the stop valves are in the closed position
and remove the screw plugs. Take care not to loose or
damage the removed parts.
Screw plug (PT) 1/2

(2) Install the connectors supplied by the manufacturer of

the attachment and connect the hoses.

„ Oil flow system

The directions of pedal operation and the oil flow system
are described in the figure below.

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 13. Operating Instructions

13-21-3. Operating attachment

When changing the hydraulic piping connection,

stop the engine and slowly loosen the connection
to release the inner pressure.

If you use the oil pressure for other hydraulic devices as

the power source, connect the piping by using the follow-
ing procedure after the engine has stopped.
1) Remove the screw plugs.
2) Connect the hose for the hydraulic tool.
3) Open the stop valve.

Operate the attachment as follows:

„ Precautions
1) When using the breaker
The breaker operates when the P.T.O. pedal is moved to
the arrowed direction.

• Make sure the P.T.O. selector valve is in the single acting

position.
Refer to Section "13-21-1. Description of stop valve,
P.T.O. selector valve, P.T.O. pedal and pedal lock".

• Make proper use of the breaker following the handling in-

structions in the operation manual provided by the man-
ufacturer of the breaker.

2) When using general attachments such as tilt bucket

Move the P.T.O. pedal to the right or the left, and the at-
tachment operates.

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13. Operating Instructions

„ Precautions
• Make sure the P.T.O. selector valve is in the double act-
ing position.
Refer to Section "13-21-1. Description of stop valve,
P.T.O. selector valve, P.T.O. pedal and pedal lock".

• Make proper use of the general attachments following

the handling instructions in the operation manual provid-
ed by the manufacturer of the general attachments.

13-21-4. Long-term storage

If the hydraulic tool is not used, do the followings:

• Disconnect the hoses for the hydraulic tool. Wind the

screw plug R (PT) 3/4 with seal tape and tighten them to
the stop valve.

Operating the P.T.O. pedal when the breaker or general at-

tachment is not mounted may cause overheating.

13-21-5. Specification
Hydraulic oil pressure specification
• Oil flow rate : 11.1 GPM (42 L / min) ( at 0 bar)

2-68
 14. Transportation

14-1. Loading and unloading the machine

For safety in transporting the machine, comply with all ap-

plicable regulations and laws.

• Be careful when loading and unloading the ma-

chine, because it is a job of high hazard poten-
tial.
• Load or unload the machine on level, solid
ground far away from the shoulder of the road.
• Load or unload the machine at a low engine
speed.
• Use ramp plates of adequate strength having
hooks. Check to see that the ramp plates are
wide, long, and thick enough to safely sustain
the machine so that you can load or unload safe-
ly. To prevent the ramp plates from bending too
much, support them with blocks.
• Securely hook the ramp plates to the deck of the
truck so that they will not come off.
• Remove mud, grease, and other slippery depos-
its from the track shoes, and grease, oil, and ice
deposits from the ramp plates to prevent the ma-
chine from skidding.
• Never change the travel direction on the ramp
plates. If you need to change the travel direction,
go back down on the ramp plates, then do this.
• Swing slowly on the truck bed if necessary since
the foothold is unstable.
• Make sure that the side door of the cabin is
locked, whether in the open or closed position.
Never open or close the side door on the ramp
plates, to prevent it from swinging violently.

To load or unload the machine, be sure to use the ramp

plates and follow the procedure below:

2-69
14. Transportation

1) Firmly brake the truck and apply wheel stoppers to the

tires. Securely install the ramp plates on the bed of the
truck in a position where the center of the truck aligns
with the center of the machine. Make sure that the left
and right ramp plates are at the same level.

The ramp plates should be set at an angle of less than

15 degrees.
Determine the span between the ramp plates on the ba-
sis of the centers of the track shoes.
Do not operate the high-speed pedal.

2) Return the accelerator lever to reduce engine speed.

3) Travel toward the ramp plates at a low speed, and load

or unload the machine with the implement lowered as
close as possible to the deck of the truck.
Do not operate any levers other than the travel levers
while driving on the ramp plates.

4) Load the machine in a safe position on the truck.

2-70
 14. Transportation

14-2. Precautions for loading the machine

Load or unload the machine on level, solid ground

far away from the shoulder of the road.

After loading the machine in a safe position on the truck,

secure the machine as follows:

1) Place the blade down on the ground.

2) Extend the bucket and arm cylinders to the maximum

limit, and slowly lower the boom down on a block of
wood.

3) Stop the engine to take the key out of the starter switch.
(The brake works to lock the swing motor.)

4) Be sure to lock the control levers with the lock levers.

5) Provide wood blocks in the front and back of the crawler

and secure the machine with a chain or a wire rope so
that the machine will not move during shipping. In par-
ticular, be sure to secure it to prevent skidding.

IMPORTANT
To protect the bucket cylinder from being damaged
during shipping, place a wooden block under one end
of the bucket to prevent it from directly touching the
deck of the truck.

2-71
14. Transportation

14-3. Precautions for transporting the machine

Select a route for transporting the machine based

on the road width and clearance, and the height
and weight of the machine.

For safer transportation, comply with all local regulations

and laws.

2-72
 14. Transportation

14-4. Suspending the machine

• Never suspend the machine if any person is on

the machine or the implement.
• Use wire ropes strong enough for the weight of
the machine.
• Do not suspend the machine in any way other
than that explained on the following page.
Failure to suspend the machine as prescribed
will throw the machine off balance.
• Do not swing the machine being suspended.
• When suspending the machine, keep the ma-
chine in balance taking care on the center of
gravity of the machine.
• Never stand near or under the suspended ma-
chine.

For safety in suspending the machine, comply with all ap-

plicable regulations.

2-73
14. Transportation

Suspend the machine on the level ground as follows:

1) Swing the upperstructure so that the blade is behind the

operator’s seat.

2) Raise the blade to the highest limit.

3) Extend the hydraulic cylinders of the front implement

(except for the swing cylinder) to the maximum.

4) Stop the engine, and make sure that nothing is left

around the operator's seat before leaving the machine.

5) Fit the shackles to the suspending hooks on the front

side (one point) and the rear side (two points), and se-
curely fasten a sling belt (or a wire rope) to the shackles.

Shipping weight:
Steel crawler type / Rubber crawler type :
-(2200 kg) for canopy;(2320 Kg) for cabin.

2-74
 15. Care and Service in Cold Weather

15-1. Preparing for cold weather

In cold weather, you may have difficulty in starting the en-

gine or the cooling water may freeze. So take measures as
follows:

15-1-1. Fuel and lube oil

Use low viscosity fuel and lube oil. For the specified vis-
cosities, refer to Section "21. Fueling, Oiling and Greasing
Based on Temperature Range".

15-1-2. Cooling water

Anti-freeze is flammable. When handling anti-

freeze, keep away from any sources of ignition. Be
sure not to smoke when handling anti-freeze.

IMPORTANT
Never use an anti-freeze containing methanol, ethanol,
or propanol.

For the timing of cooling water change and the mixing ratio
of the anti-freeze, refer to Section "25-2. Nonperiodic ser-
vices".

Note :
Because a YANMAR genuine long-life coolant (LLC) is
added to the cooling water, you need not change it unless
the temperature below -31°F (-35°C).
If the temperature falls below -31°F (-35°C), refer to Sec-
tion "25-2. Nonperiodic services" to control the density of
the cooling water.

2-75
15. Care and Service in Cold Weather

15-1-3. Battery

• The battery generates flammable gas and it can

cause a fire and an explosion. Keep sparks or
flames away from the battery.
• Battery electrolyte contains dilute sulfuric acid
and is strong acid. To avoid serious injury, do not
allow the electrolyte to contact skin or splash
into eyes.
If the electrolyte contacts your skin or gets in
your eyes, flush immediately with large amounts
of water, and obtain medical treatment at once.

Battery performance is deteriorated as the temperature

goes down. When the battery voltage is low, battery elec-
trolyte will easily freeze. Keep the charging rate close to
100% (full charging) and keep the battery warm for easy
start the next day.

Note :
Measure the specific gravity of the electrolyte to determine
the charge ratio using the conversion table given below.
Electrolyte temperature
68°F 32°F 14°F -4°F
(20°C) (0°C) (-10°C) (-20°C)
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

The specific gravity of the electrolyte varies with its tem-

perature and recharged condition.

2-76
 15. Care and Service in Cold Weather

15-2. Precautions after a day's work

To prevent the machine from getting stuck in the morning
due to the mud or water and frozen deposits on the under-
carriage, be sure to observe the following precautions.

• Remove mud or water adhering to the machine. If mud

or water droplets adhering to the hydraulic cylinder rods
get into the seals, the seals could be damaged. So do
this to prevent it.

• Park the machine on solid, dry ground.

If no solid, dry ground is available, lay plates on the
ground and park the machine on the plates to prevent
the frozen tracks from sticking to the ground.

• Drain the water accumulated in the fuel system by turn-

ing on the drain plug to prevent freezing.

• As battery performance is deteriorated in low tempera-

tures, cover the battery or move it to a warm place, and
reinstall it in the machine on the next morning.
If the level of the battery electrolyte is low, add distilled
water before starting operation on the next morning. To
prevent the battery from freezing at night, do not add dis-
tilled water after completing operation.

15-3. After cold weather ends

When the temperature rises, do the following:

• Replace the lube oil and fuel with the specified viscosi-
ties according to Section "21. Fueling, Oiling and Greas-
ing Based on Temperature Range".

• If you have added an AF-PT anti-freeze (for one winter

season only), fully drain the cooling system, flush the in-
side of the cooling system well, and fill the cooling water
tank with tap water.

2-77
 16. Long-term Storage

16-1. Before storing

IMPORTANT
When storing the machine, set up the machine as illus-
trated in the right figure to protect the hydraulic cylinder
rods from being corroded.

When storing the machine for a long period, do the following:

• Clean all parts and store the machine indoors. If you have
to store the machine outdoors, park the machine on level
ground and cover it with a protective sheet.
• Apply lube oil and grease to the machine and replace the
engine oil.
• Apply a little amount of antirust to exposed parts of the hy-
draulic cylinder rods.
• Fill the battery with distilled water up to the upper level mark.
After the battery has fully recharged, disconnect the nega-
tive terminal, and cover the battery or remove the battery
from the machine to store it.
• Add an anti-freeze to the cooling water if the air temperature
can fall below 32°F (0°C).
Because a YANMAR genuine long-life coolant (LLC) is add-
ed to the cooling water, you need not change it until the tem-
perature falls down to -31°F (-35°C).
If the temperature falls below -31°F (-35°C), refer to Section
"25-2. Nonperiodic services" to control the density of the
cooling water.
• Lock the control levers and pedals with the lock levers and
pedal guards respectively.
• Antirust
When stored near the sea or in a place exposed to sea
breezes, the machine easily becomes rusty. Carefully apply
an antirust to all exposed parts of the piston rods and cover
the machine with a polyethylene sheet or oil paper.
Recommended antirust Manufacturer
P-1300 (Solvent cutback rust preventive oil) Nihon Sekiyu
P-3 (Solvent cutback rust preventive oil) Japan Energy
P-300 (Solvent cutback rust preventive oil) Cosmo Sekiyu

Some antirust solvent damages rubber materials. Be sure to

use the recommended antirust or its equivalent.
• To prevent condensation inside the fuel tank, either drain off
the fuel tank or fill the tank.

2-78
 16. Long-term Storage

16-2. Storing

When you have to operate the machine indoors for

the antirust procedure, be sure to ventilate the
area well by opening windows and doors to pre-
vent asphyxiation.

Move the machine at least once a month to form new oil

films on all the moving parts during long-term storage, and
recharge the battery at the same time.

16-3. Using the machine again

IMPORTANT
When reusing a machine stored for a long time without
antirust treatment once a month, consult your dealer.

To use the machine again after a long period of storage,

follow the procedure below:

• Wipe antirust off the hydraulic cylinder rod.

• Apply a generous amount of grease or oil on the moving

part.

• Drain water from the fuel tank, the engine oil pan and the
hydraulic oil tank by removing the drain plugs.

• After starting the engine, warm-up the machine.

2-79
 17. Troubleshooting

17-1. Phenomena that are not breakdowns

The following phenomena are not breakdowns:

• Shaking of the bucket

When the boom is raised immediately after extending the
arm while curling the bucket, the bucket may shake. This
phenomenon is not a breakdown.

• Discontinuous arm movement

When digging the ground with the arm, the arm may slow
down at the almost vertical position momentarily.
This phenomenon is not a breakdown. Especially, this
phenomenon will occur when the engine speed is low.

• Shift in upperstructure position

When turning the machine sharply such as spin-turning or
pivot-turning, the upperstructure may be slightly shifted.
This phenomenon is not a breakdown.

• Thermal shock of the travel motor

If, in cold weather, the temperature of the hydraulic oil is
raised 140°F (60°C) higher than the outside temperature
by relief operation without traveling after the engine has
started, sometimes the machine cannot pivot-turn be-
cause of thermal shock. This phenomenon is not a
breakdown.

• The swing cylinder is extended when digging

The swing cylinder may be extended in some digging sit-
uations or postures. This phenomenon is not a break-
down.

• Time lag in travel speed change response

At low engine speed, a time lag in response may occur
when the travel speed is changed from high-speed to
low-speed. This phenomenon is not a breakdown.

2-80
 17. Troubleshooting

17-2. Towing

Always safely tow a disabled machine by using the

proper tools.
Towing in incorrect methods or improper proce-
dures could result in bodily injury.
Follow the recommendations below to properly
perform the towing procedure.

If the machine becomes mired in the muddy ground and

cannot come out by itself, or when it is necessary to tow a
heavy object with the machine tractive force, tie the sling
belt as illustrated on the right.

IMPORTANT
• Check to see that the wire ropes, sling belts, and
shackles to be used are of sufficient strength and
are free from cracks and damage. Never tow the ma-
chine with the wire rope attached only to the hook.
• The hook is only intended for stabilizing the machine
during transporting.

2-81
17. Troubleshooting

17-3. If the battery is overdischarged

• Stop the engine and turn the starter switch key to

the "OFF" position before checking or servicing
the battery.
• Flammable hydrogen gas is produced by the bat-
tery which may cause ignition. Keep flames of
cigarettes and sparks away from the battery.
• The battery electrolyte is a strong acid contain-
ing dilute sulfuric acid, and it is dangerous.
If the battery electrolyte contacts your clothes,
they may be damaged.
If the battery electrolyte gets into your eye or
contacts your skin, it may cause serious injury.
If the battery electrolyte contacts your clothes or
skin, immediately wash them with large amounts
of water.
If the battery electrolyte gets into your eye, im-
mediately wash your eyes with large amounts of
water, and obtain medical treatment at once.
• Be sure to wear safety goggles when handling a
battery.
• To disconnect the terminals, begin with the neg-
ative terminal (ground side); to connect the ter-
minals, begin with the positive terminal.
If a tool touches both the positive terminal and
the machine, hazardous sparks may be generat-
ed.
• If a terminal is loose, hazardous sparks may be
generated due to poor contact, which could
cause ignition and explosion.
Be sure to securely connect the terminals.

2-82
 17. Troubleshooting

17-3-1. Starting the engine using booster battery cables

To start the engine using booster battery cables, do the fol-
lowing.

„ Precautions for connecting and disconnecting the

booster battery cables

• When you start the engine using booster battery

cables, wear safety goggles.
• If you start the engine by taking electric power
from another machine, do not allow contact be-
tween your machine and the other machine.
• To connect the booster battery cables, begin
with the positive terminal, and to disconnect
them, begin with the negative terminal (ground
side).
• If a tool touches the positive terminal and the ma-
chine at the same time, hazardous sparks may be
generated.
• Do not connect the booster battery cables to ter-
minals of the reverse polarity. That is, never con-
nect the negative terminal on one machine to the
positive terminal on the other machine.
• As the last step, connect the negative booster
battery cables to the upperstructure. At this time,
sparks will be generated. Connect the terminal to
a point as far away from the battery as possible.

IMPORTANT
• The booster battery cables capacity and the clip size
should be suitable for the battery size.
• The battery of the normal machine should be the
same capacity as that of the machine in trouble.
• Check the booster battery cables and clips for an ab-
sence of damage, cracks, and corrosion.
• Securely connect the clips.

2-83
17. Troubleshooting

„ Charging with the battery mounted on the machine

• Remove the battery cables from the positive and nega-
tive terminals of the battery before charging it. If this is
not done, abnormal voltage may be applied to the gener-
ator which could damage it.

• While charging the battery, remove all plugs to release

the gases generated by charging.

• If the battery overheats [the temperature of the electro-

lyte exceeds 113°F (45°C)], interrupt charging.

• Stop charging as soon as the process has been complet-

ed.
Overcharging could cause the following troubles:
• Overheating of the battery
• Decrease in battery electrolyte
• Battery failure

• Do not reverse polarity of the battery cable connected to

the battery (i.e., the negative to the positive, or the posi-
tive to the negative).
Reversing the polarity in the connection will cause the
generator to be damaged.

• Handling the battery (except for checking the electrolyte

level and measuring the specific gravity of the electro-
lyte) should be performed after disconnecting the battery
cables.

2-84
 17. Troubleshooting

„ Connecting the booster battery cables

Turn the starter switch to the "OFF" position, and connect
the booster battery cables as follows:
1) Turn the starter switches on the normal machine and
the machine in trouble to the "OFF" position.

2) Connect the clip of the booster battery cables (A) (nor-

mally red) to the positive terminal on the machine in
trouble.

3) Connect the other clip of the booster battery cables (A)

to the positive terminal on the normal machine.

4) Connect the clip of the booster battery cables (B) (nor-

mally black) to the negative terminal on the normal ma-
chine.

5) Connect the other clip of the booster battery cables (B)

to the engine block of the machine in trouble.

„ Starting the engine

1) Make sure that the clips are securely connected to the
battery terminals.

2) Start the engine on the normal machine, and increase

the engine speed to the maximum.

3) Turn the starter switch on the machine in trouble to the

"START" position to start the engine.
If the engine does not start, wait for more than two min-
utes and retry starting. (At this point, do not stop the en-
gine on the normal machine and keep engine speed at
full.)

2-85
17. Troubleshooting

„ Disconnecting the booster battery cables

After the engine on the machine in trouble has started, dis-
connect the booster battery cables in the reverse order of
the connecting procedure.
1) Remove the clip of the booster battery cables (B) from
the engine block on the machine in trouble.

2) Remove the clip of the booster battery cables (B) from

the negative terminal on the normal machine.

3) Remove the clip of the booster battery cables (A) from

the positive terminal on the normal machine.

4) Remove the clip of the booster battery cables (A) from

the positive terminal on the machine in trouble.

2-86
 17. Troubleshooting

17-4. Troubleshooting

17-4-1. Engine and electrical equipment

• Contact your dealer about the measures shown in paren-
theses in the list below.
• If there is any abnormality or trouble whose cause is un-
known other than those shown below, ask your dealer for
repair.
Problem Cause Measure
Engine Steam comes out of top of • Shortage of cooling water • Check cooling water level.
radiator. Refill, if necessary.
Water temp alarm lamp (Check cooling water for leak from
water port.)
lights.
• Loose fan belt • Adjust belt tension.
• Buildup of dust and water scale on • Replace cooling water. Clean inside
cooling system of cooling water system.
• Defective thermostat • Replace thermostat.
• Clogged radiator fin or inclined fin • Clean or repair fin.
• Defective electrical system • Check or replace electrical system.
Turning on starter motor • Shortage of fuel • Refill fuel tank.
does not start engine. • Air mixed in fuel system • Repair air leak.
Release air from fuel system.
• Defective fuel injection pump or dete- (• Replace pump or nozzle.)
riorated nozzle performance
• Improper compression (• Check and repair.)
• Blown out fusible link • Replace fusible link.
• Damaged key stop solenoid. Link dis- (• Check and repair.)
engagement
Dark fumes come out of • Clogged air cleaner element • Clean or repair element.
machine. • Deteriorated nozzle performance (• Check and repair.)
• Improper compression (• Check and repair.)
Exhaust color is white or • Too much oil in oil pan • Drain oil from oil pan to specified lev-
bluish white. el.
• Improper fuel • Replace fuel with recommended one.
• Worn cylinder or piston ring (• Repair.)
Electrical Turning starter switch to • Defective wiring system • Check and repair wiring system.
equipment "START" dose not start • Defective starter switch • Replace starter switch.
starter motor. • Insufficiently charged battery • Recharge battery.
• Defective starter motor (• Check and repair.)
Maximum engine speed • Defective wiring system • Check terminals for looseness and
does not provide enough disconnection. Repair terminal, if nec-
brightness of lamps. essary.
• Defective generator or regulator (• Check and repair.)
During engine operation, • Defective regulator (• Replace regulator.)
lamp is extremely bright, (• Repair.)
and frequently burns out.
Electrolyte leaks from bat-
tery.
Speed of starter motor is • Defective wiring system • Check and repair wiring system.
too low. • Insufficiently charged battery • Recharge battery.
• Defective starter motor (• Check and repair.)

2-87
17. Troubleshooting

17-4-2. Machine body

• Contact your dealer about the measures shown in paren-
theses in the list below.
• If there is any abnormality or trouble whose cause is un-
known other than those shown below, ask your dealer for
repair.
Problem Cause Measure
Machine Power or speed of moving • Deteriorated function caused by worn (• Replace hydraulic pump.)
body part is low. hydraulic pump
• Pressures of main relief valve, or port (• Check and repair valves.)
relief valve of control valve are
dropped below set value.
• Damaged hydraulic cylinder (• Check and repair.)
• Insufficient amount of hydraulic oil • Replenish hydraulic oil up to specified
level.
• Clogged filter • Clean or replace filter.
Upperstructure does not • Swing brake is not released (• Check and repair.)
swing or does not swing • Insufficient amount of grease • Check and grease.
smoothly. • Defective swing brake valve (• Check and repair.)
• Defective swing motor (• Check and repair.)
Temperature of hydraulic • Insufficient amount of hydraulic oil • Replenish hydraulic oil up to specified
oil is too high. level.
• Overload • Lower load.
Machine does not move • Improperly adjusted crawler or • Adjust or clean.
straight. trapped foreign material
• Damaged hydraulic motor. (• Check and repair.)
• Defective hydraulic pump (• Check and repair.)
• Defective control valve (• Check and repair.)
• Damaged sprocket, idler or track roll- (• Check and repair.)
er.

2-88
MAINTENANCE

3-1
 18. Precautions for Servicing
Do not use any inspection or servicing procedures that are not described and recommended in
this manual.
Park the machine on solid, level ground to inspect and service it.

Check the hourmeter

Read the hourmeter every day to check if any service item has reached the time prescribed for imple-
mentation.
Use YANMAR genuine replacement parts

Use YANMAR genuine parts specified in the parts catalog

Use YANMAR genuine lube oil and grease
Use YANMAR genuine lube oil and grease of specified viscosity with regard to the temperature.

Use clean lube oil and grease

Use clean lube oil, grease and containers to prevent dust from mixing into them.

Clean the machine

Clean the machine for easy isolation of faulty parts.
Particularly clean the grease nipple, breather, and the oil level gauge glass to prevent dust from entering
into them.

Be careful of high water and oil temperatures

It is dangerous to replace the oil, the cooling water and the filter immediately after stopping the engine.
Wait until their temperatures drop. When the engine oil is too cool, heat the oil to adequate temperature
[approximately 68°F to 104°F (20°C to 40°C)] before draining oil to improve draining efficiency.

Check the drained oil and the old filter element

When replacing the engine oil, the hydraulic oil, or the filter element, check the drained oil and the old
filter element for metallic dust and foreign solid deposits.

Observe precautions for replenishing oil

If a strainer is mounted on the oil port, do not remove the strainer to replenish oil.

Be careful of dust
When checking or replacing the oil, do this in the place with no dust or other particles to prevent dust
contamination.

3-2
 18. Precautions for Servicing

Attach the warning tag

When the oil or the cooling water is drained, attach the "SERVICING IN PROGRESS" tag to the opera-
tor's seat so that other persons will not start the engine.

Observe the warning labels

Observe the warning labels affixed to the machine.

Observe the precautions for welding

• Make sure to disconnect the battery cables (positive and negative terminals).
• Do not apply more than 200 V continuously.
• Ground the machine within 39.37 in. (1000 mm) from the welded part.
• Make sure that there is no seal or bearing between the welded part and the grounded part.
• Do not ground around the pins on the implement or the hydraulic cylinder.

Be careful of fire
Clean parts with noncombustible detergent.

Clean mating surfaces before assembly

When you have removed a part with an O-ring or a gasket seal, clean the mating surfaces before install-
ing the new part.
At this point, do not fail to refit the O-ring or the gasket

Do not drop anything from your breast pocket

When you open the cover and attempt to look down into the inside of the machine, remove loose items
from your breast pocket to eliminate the risk that they may drop into the machine.

Check the undercarriage

After the machine is used at a rocky place, check the undercarriage for damage. Check for loose bolts
and nuts, cracks, wear, and other damage. Loosen the tension of the crawler more than usual.

Observe the precautions for cleaning the machine

• Do not spray steam directly at the connectors.
• Do not splash water on the monitors in the cabin.
• Do not spray high-pressure water directly at the radiator and the oil cooler.

3-3
18. Precautions for Servicing

Check before and after working

If the machine is to be used in mud, rain, snow, or on a beach, check for loose plugs and cocks before
working. After working, clean the machine and check each part for cracks and damage and check for
loose or missing bolts and nuts. Apply grease earlier than usual. Particularly apply grease every day to
the pins on the implement which are submerged in mud.

Observe the precautions for working in a dusty place

If you use the machine in a dusty place, be careful of the following:
• Check the air cleaner for clogging.
Clean the air cleaner element earlier than scheduled.
• Clean the radiator fin earlier to prevent it from clogging.
• Clean or replace the fuel filter element earlier than scheduled.
• Clean the electric equipment, especially the starter motor and the generator, to avoid dust deposits.

Do not mix oils

Never mix oils of different makes or types. If you have to replenish an oil with a different make or type
than the one already in the tank, remove the remaining oil completely.

3-4
 19. Basic Servicing Practices
• Use YANMAR genuine replacement parts.

• Do not mix oils of different makes and types when replacing or replenishing oil.

• The following types of oil and cooling water are used in the factory for shipping unless otherwise spec-
ified:

Item Type
Engine oil Engine oil SAE10W30, CD class
Travel reduction gear SAE90 (GL-4)
Hydraulic oil YANMAR SUPER HYDRO. OIL (ISO VG46)
Fuel Diesel light oil
Engine cooling water YANMAR genuine long-life coolant (LLC) 51% added

3-5
19. Basic Servicing Practices

19-1. Oils, fuel, and cooling water

19-1-1. Oils

• Because the oil is used in the engine and implement under extreme conditions (high temperature and
pressure), it deteriorates as time elapses.
Be sure to use oils of the grades which are specified in the Operation Manual and suitable for the op-
erating temperature range.
Even if the oil is not contaminated, be sure to replace the oil within the specified service hours.

• Oil is equivalent to blood in a human body. Be careful in handling it so that impurities (water, metallic
dust, and foreign solids) will not be mixed into it.
Most machine failures are caused by impurities in the oils.
Be careful not to mix impurities into the oils especially after storing the machine and replenishing oils.

• Do not mix oils of different makes and types.

• Use the specified amount of oil.

Larger or smaller amounts of oil than specified may cause machine problems.

• If the oil becomes cloudy, it may suggest that water or air could have been mixed into the hydraulic
system. If this event happens, ask your dealer.

• Be sure to replace the oil filter element with a new one when changing the oil.

• To know what condition the machine is in, it is recommended that you analyze the properties of the oil
periodically.
Ask your dealer for more information on this issue.

3-6
 19. Basic Servicing Practices

19-1-2. Fuel

• Because the fuel injection pump is a precision device, using a fuel containing water or dust will cause
problems.

• Be careful that impurities will not be mixed into the fuel especially after storing the machine and refueling.

• Be sure to use a fuel recommended in the Operation & Maintenance Manual.

In addition, keep in mind that you should use a fuel appropriate for the operating temperature range
because it will freeze at temperatures lower than -13°F (-25°C).

• Fully refuel every day after finishing the work so that the moisture in the fuel tank will not condense and
water will not mix with the fuel.

• Before starting the engine, or ten minutes after refueling, drain any deposits and water through the
drain plug on the fuel tank.

• If the fuel level becomes low or the filter element is replaced, the air should be released from the fuel
system.

19-1-3. Cooling water

• Because unpotable water may contain much calcium and impurities, using it will cause water scales
to build up in the engine or the radiator, causing poor heat exchange and overheating.
Never use water which is not potable for cooling purposes.

• When using an anti-freeze, observe the precautions described in the operation & maintenance manual.

• The YANMAR machine is shipped with the YANMAR genuine anti-freeze. The anti-freeze is anticorrosive
to protect the cooling system.
Because the anti-freeze can be used continuously over two years, you need not remove it in hot weather.

Keep sources of ignition away from the antifreeze

because it is flammable.

• The mixing ratio of the anti-freeze to the water differs based on air temperature.
For the mixing ratio, refer to Section "25-2-5. Cleaning the inside of the cooling system".

• If the engine is overheated, replenish the cooling water after the engine has cooled down.

• Shortage of cooling water will cause the cooling system not only to overheat but also to corrode due
to air which comes in the system.

3-7
19. Basic Servicing Practices

19-1-4. Grease

• Grease ensures smooth operation of moving parts such as connectors and prevent operating noises.

• The nipples not listed on the pages for periodic service are those for overhaul. Normally it is not nec-
essary to refill them.
Grease them if any abnormal condition arises after long term use.

• Wipe the extruded old grease off with a rag after greasing.
Carefully wipe the old grease off completely from all moving parts which are easily worn by adhered
sand or dust.

19-1-5. Storing the oil and fuel

• Store the oil and fuel indoors so that they will not be contaminated by impurities such as water or dust.

• When you store oil or fuel in drums for a long period, position them so that their outlets align in a
straight line (to prevent moisture absorption).
When storing the oil or the fuel outdoors, cover the drums with a waterproof sheet.

• To avoid deterioration caused by long-term storage, use the oil on a first-in first-out basis.

19-1-6. Filter

• The filters are very important parts which prevent impurities from getting into critical devices through
the lube oil, fuel and air systems.
Replace the filter elements periodically according to the instructions of the Operation Manual.
Under difficult conditions, you need to replace the filter elements earlier than suggested in the Opera-
tion Manual depending on the type of oil and fuel (sulfur content).

• Never reuse the filter elements (cartridge type) by cleaning them.

• When replacing an oil filter element, check that no metallic dust or foreign solids are present on the old filter.
If they are found to be present, contact the nearest dealer.

• Do not unpack the filter element before use.

• Use YANMAR genuine filter elements.

3-8
 19. Basic Servicing Practices

19-2. Electrical equipment

• If electrical equipment gets wet or wiring insulation is broken, electric leaks may occur and the machine
may malfunction which is very dangerous.

• Check the fan belt for tension and damage, and also check the battery for electrolyte level.

• Never disconnect or disassemble the electrical equipment mounted on the machine.

• Do not mount any electrical equipment other than those items provided by YANMAR.

• Be careful not to spray water on the electrical equipment when washing the machine or operating in
the rain.

• After working near the sea, take necessary precautions to protect the electrical equipment from corro-
sion.

3-9
19. Basic Servicing Practices

19-3. Hydraulic system

• The hydraulic system is hot during and immediately after
operation. It is also given high pressure during operation.
Therefore, check and service the hydraulic system care-
fully as follows:
• Put the bucket on the level ground so that no pressure
is applied to the hydraulic cylinder circuits.
• Be sure to stop the engine.
• Wait until the temperature drops sufficiently and then
start maintenance since the hydraulic oil and the lube
oil are at high temperature and high pressure immedi-
ately after operation.
Do not suddenly remove any plugs, screws or connect-
ing parts of the hoses. Otherwise oil may spout out due
to residual internal pressure even when the oil temper-
ature has lowered. Be careful not to face them when
loosening them to prevent injury, and loosen them little
by little to remove the internal pressure.
• Be sure to release air inside the hydraulic oil tank to re-
move the internal pressure when checking and servic-
ing the hydraulic system.
• Check the hydraulic oil level, replace the filter element,
and replace the hydraulic oil when necessary.
• When removing the hydraulic hoses and pipings, check
the O-ring and the packing for damage before reinstall-
ing them.
Replace them if they are damaged.
• Release air after replacing or cleaning the hydraulic oil fil-
ter element or strainer, repairing or replacing the hydraulic
equipment, or removing the hydraulic cylinder or piping.

Release air according to the following procedure:

1) Set the engine rotation to medium. That is, set the lever in the middle of the stroke.
2) Slowly operate each cylinder 4 to 5 times to approximately 3.9 in. (100 mm) before both stroke ends.
3) Operate the cylinder 4 to 5 times at full stroke.
• Failure to release air from the hydraulic cylinder and operating it suddenly to the stroke ends could
cause piston seal damage.
• If air is left in the hydraulic circuit, air is compressed and swollen by the load and the hydraulic
equipment does not operate smoothly.
Air in the hydraulic circuit may shorten the service life of the hydraulic pump.
4) Check the hydraulic oil level and replenish to the specified level if necessary.

3-10
 20. Consumables
Periodically replace consumable parts such as filter element and bucket teeth.
Periodic replacement prevents malfunction of the machine. When you replace a part, be sure to use a
Yanmar genuine part.
When ordering consumables, let us know the parts numbers given in the parts catalog.

List of consumables
The numbers of parts in ( ) represent those which must be replaced at the same time.

Item Parts number Name Q'ty Replacing time interval

Every 200 service hours
Engine oil filter 119305-35150 Oil filter 1
(At first 50 service hours)
Every 500 service hours
Hydraulic oil tank return filter 172175-73710 Filter element 1
(At first 250 service hours)
124550-55700 Fuel filter element 1
Fuel filter Every 400 service hours
(24311-240100) (O-ring) (1)
Air cleaner 129619-12520 Cleaner element 1 Every 400 service hours

Bucket -

3-11
 21. Fueling, Oiling and Greasing Based on Temperature Range

21-1. Fuel and oil

Select fuel and oil based on to the air temperature range.

The prescribed amount of oil means the total amount of oil included in the piping and equipment. The
amount of oil to be changed means the amount of oil replaced in checking and servicing.
If you start the engine at air temperatures lower than 32°F (0°C), use SAE10W, SAE10W-30, or
SAE15W-40 even if the temperature in the daytime rises to 50°F (10°C) or so.

21-2. Cooling water

Because a YANMAR genuine long-life coolant (LLC) is added to the cooling water, you need not change
it unless the temperature falls bellow -31°F (-35°C).
If the temperature falls below -31°F (-35°C), refer to Section "25-2. Nonperiodic services" to control the
density of the cooling water.

3-12
 22. Standard Tightening Torque for Bolts and Nuts

22-1. Required tools

The following tools are required for servicing:

No. Name Part number Q'ty

1 Screw driver (universal system) 104200-92350 1

2 Filter wrench 68 119332-92751 1

3 Filter wrench 80 119640-92750 1

4 Filter wrench LO 171301-92750 1

5 Pressuring nozzle 172122-05101 1

6 Wrench 8¯10 28110-080100 1

7 Wrench 12¯14 28110-120140 2

8 Wrench 17¯19 28110-170190 1

9 Wrench 22¯24 28110-220240 1

10 Wrench 27¯30 28110-270300 1

11 Wrench 32¯36 28110-320360 1

12 Hexagon bar wrench 5 28150-050000 1

13 Hexagon bar wrench 8 28150-080000 1

14 Box wrench 27¯140 28227-271400 1

15 Turning handle 12¯250 28230-120250 1

16 Grease hose 933110-09701 1

17 Grease gun 800 933110-09801 1

18 Pliers 200 933171-00470 1

If the tools listed above are damaged, order them from your dealer.

3-13
22. Standard Tightening Torque for Bolts and Nuts

22-2. Torque table

Bolts or nuts in the metric system should be tightened at the torque described below unless specified
otherwise.

Item Thread size¯pitch Tightening torque ft•lbf (N•m) Remarks

Hexagon bolt (7T) Coarse M6¯1 7.23 to 8.68 (9.8 to 11.8) 1) Apply 80% tightening torque
Nut threads when tightened to aluminum.
M8¯1.25 16.6 to 21.0 (22.6 to 28.4)
2) Apply 60% tightening torque for
M10¯1.5 32.6 to 43.4 (44.1 to 58.8)
4T bolt and lock nut.
M12¯1.75 57.9 to 72.3 (78.5 to 98.1) 3) Use fine thread screws for en-

M14¯2 86.8 to 108.5 (117.7 to 147.1) gine only.

M16¯2 123.0 to 151.9 (166.7 to 206.0)

M18¯2.5 173.6 to 209.8 (235.4 to 284.4)

M20¯2.5 238.7 to 296.6 (323.6 to 402.1)

Fine M14¯1.5 94.0 to 108.5 (127.5 to 147.1)

threads
M16¯1.5 155.5 to 177.2 (210.9 to 240.3)

PT plug 1/8 7.2 (9.8)

1/4 14.5 (19.6)

3/8 21.7 (29.4)

1/2 43.4 (58.8)

Pipe joint bolt M8 9.4 to 12.3 (12.7 to 16.7)

M12 18.1 to 25.3 (24.5 to 34.3)

M14 28.9 to 36.2 (39.2 to 49.0)

M16 36.2 to 43.4 (49.0 to 58.8)

IMPORTANT
If a part to be tightened is made of resin like a panel board, excessive tightening torque may dam-
age the tightened part. Be careful when tightening.

3-14
 23. Replacing Essential Parts Periodically
For safe operation, the machine must be serviced periodically. To increase safety, be sure to periodically
replace the parts listed in the table of safety parts on the next page. A fire could result if they deteriorate
or are damaged.

These parts are vulnerable to age and wear or deterioration and it is difficult to determine the degree to
which they have deteriorated on the occasion of periodic service. To maintain their proper function at all
times, therefore, replace them with new ones after using them for a specific period of time even if no
abnormality is found with the parts.
If you find abnormalities in these parts before their scheduled replacement time is reached, repair or re-
place them immediately.
If a hose clamp is deformed or cracked, replace it immediately.
Check the hydraulic hoses (which are not periodic replacement parts). If any abnormality is found in
them, retighten them or replace them immediately.

When replacing the hydraulic hoses, replace the O-rings and seals at the same time.

For further information about replacing the safety parts, ask your dealer.

Check the fuel and hydraulic hoses according to the periodic schedule described below.

Check categories Check points

Start-up check Oil leak from the connections or bodies of the fuel and hydraulic hoses

Voluntary monthly check Oil leak from the connections or bodies of the fuel and hydraulic hoses
Damage (crack, wear, or peeling) of the fuel and hydraulic hoses

Prescribed annual check Oil leak from the connections or bodies of the fuel and hydraulic hoses
Interference, crushing, aging, torsion, or damage (crack, wear, or peeling) of the fuel and hydraulic
hoses

3-15
23. Replacing Essential Parts Periodically

„ List of safety parts

No. Safety parts to be replaced periodically Q'ty Replacement time intervals

1 Fuel hose (fuel tank to water separator) 1

2 Fuel hose (water separator to feed pump) 1

3 Fuel hose (feed pump to fuel filter) 1

4 Fuel hose (fuel filter to fuel injection pump) 1

5 Fuel hose (fuel filter to fuel tank) 1 Earlier of either every 2 years or every 4000
6 Fuel hose (fuel injection pump to fuel filter) 1 service hours

7 Fuel hose (fuel injection valve to fuel injection valve) 2

8 Fuel hose (fuel injection valve to fuel injection pump) 1

9 Fuel tube cap 1

10 Main pump outlet hose (P1, P2, P3 to C/V) 3

3-16
 24. Maintenance Table
Daily and periodic inspection are important to keep the machine in its best condition. The following is a
summary of inspection and servicing items by inspection interval. Periodic inspection intervals vary de-
pending on the use, loads, fuels and lube oils used and handling conditions, and are hard to establish
definitively. The following should be treated only as a general standard.
When the time for an inspection approaches, study the relevant pages in the Operation & Maintenance
Manual. Keep a record of daily operation and the results of maintenance work.

24-1. Table of service time intervals

Check and service points Page

„ At first 50 hours (only once after the new machine has started to be used)
Replacing the engine oil and the engine oil filter element 3-22
Checking and adjusting the fan belt tension 3-22

„ At first 100 hours (only once after the new machine has started to be used)
Checking and adjusting the intake/exhaust valve clearances 3-22
Retightening cylinder head bolts 3-22
Replacing the lube oil for the travel reduction gearbox 3-22

„ At first 250 hours (only once after the new machine has started to be used)
Replacing the hydraulic oil return filter element 3-22
Cleaning the suction filter element in the hydraulic oil tank 3-22

„ Nonperiodic servicing
Checking the rubber crawler (for rubber crawler type) 3-23
Checking and adjusting the rubber crawler tension (for rubber crawler type) 3-25
Replacing the rubber crawler (for rubber crawler type) 3-28
Replacing the bucket teeth 3-31
Cleaning the inside of the cooling system 3-33

„ Checking before start-up

Checking and replenishing the cooling water 3-37
Checking and replenishing the engine oil 3-38
Checking and replenishing the fuel in the fuel tank 3-39
Checking and replenishing the hydraulic oil in the hydraulic oil tank 3-40
Checking and adjusting the fan belt tension 3-41
Checking and replenishing the battery electrolyte 3-41
Greasing 3-42
Checking the electrical equipment 3-43

3-17
24. Maintenance Table

Check and service points Page

„ Every 50 hours
Greasing the swing gear and the swing bearing 3-44
Draining the water and deposits in the fuel tank 3-44
Cleaning the water separator element 3-45
Cleaning the fuel filter element 3-46

„ Every 100 hours

(Perform the same maintenance every 50 service hours) 3-46

„ Every 200 hours

Replacing the engine oil and the engine oil filter element 3-47
Checking and adjusting the fan belt tension 3-49
Checking and cleaning the air cleaner 3-50
Checking and cleaning the radiator fins 3-52
Adjusting the governor lever and accelerator device 3-53

„ Every 250 hours

Checking and replenishing the lube oil for the travel reduction gearbox 3-54

„ Every 400 hours

Replacing the fuel filter element 3-55
Replacing the air cleaner element 3-57

„ Every 500 hours

Replacing the hydraulic oil return filter element 3-58

„ Every 1000 hours

Replacing the lube oil for the travel reduction gearbox 3-59
Replacing the hydraulic oil and cleaning the suction filter element 3-60
Checking and adjusting the intake/exhaust valve clearances Ask your dealer
Checking and adjusting the fuel injection valve Ask your dealer
Retightening the cylinder head bolts Ask your dealer

„ Every 2000 hours

Check and replace fuel oil pipe, cooling water pipe Ask your dealer
Lapping the intake/exhaust valve Ask your dealer
Check fuel pump adjust Ask your dealer

3-18
 24. Maintenance Table

„ List of periodic inspection and servicing

‘ : Check c : Supply z : Replace : Adjust (clean) „ : Oil & grease
Check & service items Daily Every Every Every Every Every
50 100 250 500 1000 hrs
General Check falling off, breakage of parts ‘
Check loosened bolts & nuts, retighten ‘
Check engine condition ‘
Clean
Lube oil *Swing gear case oil Check, resupply c
Replace z1st time z
Travel reduction gear oil Check, resupply c
Replace z1st time z
*Transmission oil Check, resupply ‘
Replace z1st time z
*Differential gear oil Check, resupply ‘
Replace z1st time z
Hydraulic Hydraulic oil Check, resupply ‘
system
Replace z
Clean suction filter 1st time
Replace return filter z z
1st time
Check for abnormality of hydraulic pump ‘
Grease Check grease-up positions, grease „
Greasing the swing gears and the swing bearings „
Greasing the track gauge change cylinder and the link fulcrum „
Undercarriage Check, adjust track tension ‘
*Check air pressure, wear, flaw in tyres ‘
Steering *Check performance, play of steering lever ‘
equipment
Check performance, play of travel lever ‘
*Check performance of speed change lever ‘
*Check performance of forward/reverse pedal ‘
*Check performance, play of steering wheel ‘
*Brake pedal Stroke ‘
Performance ‘
*Parking brake Stroke ‘
Performance ‘
Check performance of accel. lever ‘
Electric Check front & work lights, horn ‘
equipment
Check hourmeter function ‘
Check function of change, oil and pilot lamps ‘
Check wire breakage, short-circuits, loosened ‘
terminals retighten
Check, resupply battery fluid ‘
Check specific gravity of electrolyte As required
Check function of OK monitor ‘

3-19
24. Maintenance Table

‘ : Check c : Supply z : Replace : Adjust (clean) „ : Oil & grease

Check & service items Daily Every Every Every Every Every
50 200 400 1000 2000 hrs
Fuel oil Check & supply of oil to the tank ‘
Drain the fuel tank
Clean the oil/water separator
Replace the fuel filter element z
Lube oil Check the quantity of engine oil ‘
Replace the engine oil z z
1st time
Replace the engine oil filter element z z
1st time
Cooling water Check & supply of cooling water ‘
Clean radiator fins
Check the fan-belt tension ‘
1st time
Replace the cooling water z
Clean & check the cooling water system zwithin one year
Rubber hose Check & replace fuel oil pipe, cooling water pipe z
Operation Check & adjust governor lever, accelerator ‘
system
Intake system Clean air cleaner & replace element z
*Check turbocharger, adjust
Cylinder Adjust the intake and exhaust valve clearance
head
Lapping the intake and exhaust valve
Fuel pump & Check fuel valve nozzle, clean
injection valve
Check & adjustment of fuel injection pressure &
atomizing condition
Check fuel pump, adjust
*Applicable to models with the relevant equipment

Note :
1) When machine is used at dusty worksites clean and replace filter element twice or more frequently
than specified in the table.
2) Execution of periodic inspection and servicing is indispensable to conform the EPA emission control
regulations.
Keep a record of the results.

3-20
 24. Maintenance Table

24-2. Service intervals when using the hydraulic breaker

When a hydraulic breaker is used, the hydraulic oil deteri-
orates earlier than in usual bucket excavating work. Set up
the service time intervals as follows:

• Replacing the hydraulic oil return filter element

Replace the hydraulic oil return filter element on the new
machine once after the first 100 to 150 hours. After that
; replace it referring to the chart at right.

• Replacing the hydraulic oil in the hydraulic oil tank

Replace the hydraulic oil according to the chart at right.

3-21
 25. Procedures for Maintenance

25-1. First services

Service only once after the new machine has started to be

used, as follows.

25-1-1. At first 50 hours

• Replace the engine oil and the engine oil filter element.
For these procedures, refer to Section "25-6. Mainte-
nance every 200 service hours".
• Checking and adjusting the fan belt tension.
For this procedure, refer to Section "25-6. Maintenance
every 200 service hours".

25-1-2. At first 100 hours

• Checking and adjusting the intake/exhaust valve clear-
ances.
(Ask your dealer.)
• Retightening cylinder head bolts.
(Ask your dealer.)
• Replacing the lube oil for the travel reduction gearbox.
For this procedure, refer to Section "25-10. Maintenance
every 1000 service hours".

25-1-3. At first 250 hours

• Replacing the hydraulic oil return filter element.
For this procedure, refer to Section "25-9. Maintenance
every 500 service hours".
• Cleaning the suction filter element in the hydraulic oil
tank.
For this procedure, refer to Section "25-10. Maintenance
every 1000 service hours".

3-22
 25. Procedures for Maintenance

25-2. Nonperiodic services

25-2-1. Checking the rubber crawler (for rubber crawler type)

The rubber crawler in the following condition requires re-
pair or replacement. Ask your dealer to repair or replace it.

„ Height of lugs
• As the lug height "a" is reduced by wear, the tractive
force decreases.
If "a" becomes 0.2 in. (5 mm) or less, replace the crawler
with a new one.

• If two links or more of the steel cord inside the crawler

are exposed due to wear of the lugs, replace the crawler
with a new one.

„ Rubber crawler steel cord breakage

If half or more of either of the steel cords is broken, replace
the rubber crawler with a new one.

„ Coming off of the core metal of the rubber crawler

If the core metal of the rubber crawler comes off even at
one place, replace the rubber crawler with a new one.

„ Rubber crawler tension

If the rubber crawler tension is loose even after grease is
put in, the grease adjuster may be defective internally. Ask
your dealer to repair the grease adjuster.

3-23
25. Procedures for Maintenance

„ Crack in the rubber crawler

If a crack occurs between any lugs of the rubber crawler,
repair if the crack length reaches approximately 2.4 in. (60
mm). If the inside steel cord is exposed even though the
crack is small, repair the rubber crawler immediately.
If the crack length is less than 1.2 in. (30 mm) or the crack
depth is less than 0.4 in. (10 mm), you do not need to re-
pair the rubber crawler.
For a decision on whether the rubber crawler should be re-
placed, repaired or should continue to be used, ask your
dealer.

3-24
 25. Procedures for Maintenance

25-2-2. Checking and adjusting the rubber crawler tension (for rubber crawler type)

• When adjusting the rubber crawler tension while

raising the machine, do not support the machine
with the implement only.
The control levers could move or the hydraulic
oil could flow out accidentally so that the ma-
chine would fall.
• When raising the machine, support it with safety
blocks of sufficient strength.
When the machine is being checked or adjusted
by two persons, one must operate the machine in
response to signs from the other.

How the rubber crawler wears out depends on the working

conditions and the nature of the ground. Be sure to check A:' ' mark inside rubber crawler

the rubber crawler for wear and tension from time to time. Idler
Rubber
Covercap A Idler
When a new rubber crawler is mounted, perform the first
check after 30 hours operation.

„ Checking the rubber crawler tension

1) Move the machine so that the joint ( mark) on the in-
side surface of the rubber crawler should be positioned
at the upper center of the track frame.

2) Lift the machine with the implement.

To do this, operate the control lever slowly.

3) The tension is proper if the clearance (H in the right fig-

ure) between the outside rolling surface of the second
track roller from the idler side and the inside surface of
the rubber crawler is within the following range :
• H=0.31 to 0.51 in. (8 to 13 mm)

Working with the rubber crawler loosened will cause the

rubber crawler to come off or the core metal to wear out
earlier.

3-25
25. Procedures for Maintenance

If the tension is improper, adjust it as follows:

„ Adjusting the rubber crawler tension

• To increase the tension
Prepare a grease gun.
1) Remove the cover.

Cover

2) Raise the machine using the implement and inject

grease through the nipple valve (1) using a grease gun
until the rubber crawler tension is within the specified
value of 0.31 to 0.51 in. (8 to 13 mm).

3) To check that the tension is proper, put down the ma-

chine and move the machine back and forth slightly.

4) Check the rubber crawler tension again. If the tension is

improper, adjust it again.

5) Install the cover.

6) The tension is adjustable until the clearance "a" is re-

duced to 0 in. (0 mm). If the tension is still loose, the rub-
ber crawler needs repairing due to excessive wear.
Contact your dealer and ask for repair.

7) If the tension is loose even after grease injection, it is

necessary to replace the rubber crawler or the grease
adjuster. Contact your dealer and ask for replacement.

3-26
 25. Procedures for Maintenance

• Loosening the tension

• Grease is under high pressure. If the nipple valve

(1) is loosened suddenly, the grease could be
ejected or the valve could blow, which causes
bodily injury.
• Do not look at the valve to determine whether
grease has been discharged or not, but check
that by the tension of the rubber crawler.
Do not loosen the nipple valve (1) more than one turn.
• It is very dangerous to discharge the grease by
any procedure other than that described below.
If the rubber crawler cannot be loosened, contact
your dealer and ask for repair.

1) Remove the cover.

2) Raise the machine with the implement and slowly loos-

en the nipple valve (1) and discharge the grease to ad-
just the rubber crawler tension to the specified value of Cover
0.31 to 0.51 in. (8 to 13 mm).

3) Never loosen the nipple valve more than one turn.

(If the grease is not discharged completely, put down
the machine and move the machine back and forth
slightly.)

4) Tighten the nipple valve (1).

Tightening torque : 36.2 ft•lbf (49.0 N•m)

5) To check that the tension is proper, put down the ma-

chine and move the machine back and forth slightly.

6) Recheck the rubber crawler tension and readjust it if

necessary.

7) Completely wipe off the discharged grease with a waste

cloth.

IMPORTANT
The rubber crawler is not grease-resistant.
Completely wipe off the grease because grease will
shorten its service life.

8) Install the cover.

3-27
25. Procedures for Maintenance

25-2-3. Replacing the rubber crawler (for rubber crawler type)

• To replace the rubber crawler with a new one,

work with a partner. You must operate the ma-
chine in response to signs from your partner.
• Because the rubber crawler is replaced with the
machine in a raised position, there is a lot of dan-
ger in letting the machine fall accidentally during
replacement. Do not move any parts other than
the rubber crawler to be replaced in doing the
job.
• The inner high-pressure of the grease can cause
the nipple valve to eject.
When you loosen the nipple valve (1), do not
loosen it more than one turn.
At this point, do not loosen any parts other than
the nipple valve (1). Also, do not turn your face
toward the nipple valve (1).
• If the rubber crawler cannot be loosened by the
procedure described here, ask your dealer to re-
pair the rubber crawler.

„ Replacing the rubber crawler

• Prepare a grease gun and steel pipes.

3-28
 25. Procedures for Maintenance

„ Removing the rubber crawler

• It is very dangerous to discharge the grease by

any procedure other than that described below.
• If the rubber crawler cannot be loosened, ask
your dealer to repair the rubber crawler.
• Before removing the rubber crawler, make sure
that the grease inside has completely been dis-
charged from the adjuster, then turn the sprocket.

1) Raise the machine with the implement.

To do this, slowly operate the control lever.

2) Loosen the nipple valve (1) little by little to discharge the

grease.

3) Do not loosen the nipple valve (1) more than one turn.

4) Insert the steel pipes into the rubber crawler and turn
the sprocket in the reverse direction. When the rubber
crawler is separated from the idler by the steel pipes,
slide the rubber crawler off.

3-29
25. Procedures for Maintenance

„ Installing the rubber crawler

1) Raise the machine with the implement.
To do this, slowly operate the control lever.

2) Engage the rubber crawler with the sprocket, and put

the rubber crawler on the idler.

3) Rotate the sprocket in the reverse direction to push the

rubber crawler in and stop rotating it.

4) Insert a steel pipe into the rubber crawler, and rotate the
sprocket again to put the rubber crawler on the idler se-
curely.

5) Stop rotating the sprocket, and check that the rubber

crawler is securely put on both the sprocket and the
idler.

6) Adjust the rubber crawler tension, referring to Section

"25-2-2. Checking and adjusting the rubber crawler ten-
sion (for rubber crawler type)".

7) Check that the rubber crawler is fully engaged with both

the sprocket and the idler and that the rubber crawler
tension is sufficient, then place the machine down on
the ground.

3-30
 25. Procedures for Maintenance

25-2-4. Replacing the bucket teeth

When the bucket teeth are worn, replace them in accordance with the following procedure:

• When replacing the bucket teeth, be careful not to

move the implement by mistake for safety.
Place the implement in a stable position, stop the en-
gine, and securely lock the lock levers.

„ Replacing the point type teeth

Replace the point type teeth before they are worn to the
adapter.
• Place the bucket so that the bottom is level.
• Removing a point:

1) Strike out the locking pin (3), which connects the point
type tooth (1) to the adapter (4), with a hammer and a
tool applied to the pin for removal of it.

IMPORTANT
Do not strike the tool toward the rubber pin lock (2).
Otherwise the rubber pin lock may be damaged. Strike
the tool toward the back of locking pin (3).

2) Remove the rubber pin lock (2).

3) Check the removed rubber pin lock (2) and locking pin
(3).

Replace the damaged rubber pin lock and locking pin. Us-
ing the following rubber pin lock and locking pin may cause
the points to come off during operation. So, replace them
with new ones.
• There is a crack in the rubber of the pin lock and the roller
may come off.
• When the roller is pressed with a finger, it sinks in the
rubber.
• The locking pin is too short.

3-31
25. Procedures for Maintenance

4) Clean the surface of adapter (4) with a putty knife to re-

move the hard mud on it.

5) Press-fit the rubber pin lock (2) into the hole in adapter
(4) by hand or by a hammer.

IMPORTANT
Do not let the rubber pin lock come out of the adapter
surface.

6) Fit the point (1) onto adapter (4) and check that the rear
surface of the pin bore in the point is aligned with the
rear surface of the pin bore in the adapter when the
point is pressed strongly.

IMPORTANT
If the rear surface of the pin (3) in the pin bore in the
point (1) is in front of the rear surface of the pin bore
in the adapter (4), do not strike the locking pin (3) in
the bores.

7) Press fit the locking pin (3) in the pin bore in the point
(1) and strike the pin so that the upper end of the locking
pin should be aligned with the surface of the point.

• Replace the rubber pin lock and the locking pin with new
ones when replacing the point to prevent it from coming
off.

„ Replacing the side cutter

Delay in replacing the side cutter could damage the bucket.
Replace the side cutter before the bucket is damaged.

Tightening torque :
108.5 to 130.2 ft•lbf (147.1 to 176.5 N•m)
Adhesive : Loctite 262
• Replace the bolts, nuts and spring washers when replac-
ing the side cutter.

3-32
 25. Procedures for Maintenance

25-2-5. Cleaning the inside of the cooling system

• The cooling water is very hot immediately after the engine has stopped. Discharging the
cooling water immediately after the engine has stopped may cause burns. Start cleaning the
inside of the cooling system after the engine has cooled down sufficiently.
• Stepping into the area behind the machine to clean the inside of the cooling system while
the engine is running is very dangerous, because you may not be visible from the opera-
tor's seat and the machine could start moving.
Also, with the engine hood being opened, contacting the radiator fan or fan belt could result
in serious bodily injury.
Never step into the area behind the machine while the engine is running.
• Do not remove the radiator cap while the water temperature in the radiator is high. Hot water
may spout from the radiator.
When you do remove the radiator cap after the water has cooled down, slowly turn the ra-
diator cap to release the internal pressure before removing it.

Clean the inside of the cooling system and replace the anti-freeze according to the following table.
Anti-freeze type Cleaning inside of cooling system and replacing anti-freeze

YANMAR Super Long-Life Coolant (LLC anti-freeze)

Every 2 years (autumn)
(All season type for anticorrosion)

LLC anti-freeze (all season type) Every 1 year (autumn)

Every 6 months (spring, autumn)

AF-PT anti-freeze (winter, one season type)
Add anti-freeze only in autumn

No anti-freeze Every 6 months

Park the machine on level ground to clean or replace the

cooling water.
The YANMAR Long-Life Coolant has anticorrosive effect
as well as anti-freeze effect.
Though the mixing ratio of an anti-freeze to water differs
with air temperature, at least 30% of anti-freeze by volume
is required to obtain anticorrosive effect.
Determine the mixing ratio of the anti-freeze to water on
the basis of the lowest past temperature, referring to the
ratio table below.
Actually set the temperature 18°F (10°C) lower than the
lowest temperature.

3-33
25. Procedures for Maintenance

Table of mixing ratio of anti-freeze to water

°F 23 14 5 -4 -13 -22 -31 -40
Lowest temperature
(°C) (-5) (-10) (-15) (-20) (-25) (-30) (-35) (-40)

Qts. 0.42 0.74 0.95 1.16 1.27 1.37 1.59 1.69

Amount of anti-freeze
(L) (0.4) (0.7) (0.9) (1.1) (1.2) (1.3) (1.5) (1.6)

Qts. 2.64 2.33 2.11 1.90 1.80 1.69 1.48 1.37

Amount of water
(L) (2.5) (2.2) (2.0) (1.8) (1.7) (1.6) (1.4) (1.3)

Note :
At the delivery from the factory, water and anti-freeze are
mixed at the rate of -31°F (-35°C) temperature above.

Keep fire away from the anti-freeze because it is

flammable.

Use tap water. If you use water in a river, a well water or a

small water-supply system, consult your dealer.

Use a densitometer for anti-freeze to control the mixing ra-

tio.

When removing the drain plug, take care that the

anti-freeze does not contact your eyes or skin.

3-34
 25. Procedures for Maintenance

„ How to clean the inside of the cooling water system

• Container for cooling water...Capacity : 3.2 Qts. (2.0 L) or
more
• Hose for supplying the water
1) Swing the upper structure so that the drain plug (P) is
positioned in the middle of the right and left crawlers.

2) Put the container for cooling water under the drain plug.

3) Open the engine hood B, slowly remove the radiator

cap, pour in the washing agent and mount the cap.

IMPORTANT
Washing methods vary depending on the manufactur-
er of the washing agent.
Follow the instructions of the manufacturer.

4) Start the engine until the water temperature rises to 176

°F (80°C) or more and idle the engine for 10 to 15 min-
utes. Then stop the engine.

5) After the engine has cooled down, slowly loosen the

drain plug to drain the cooling water and remove the ra-
diator cap.
When the drain plug is removed, the cooling water in
the radiator is completely drained.

6) After the water is completely drained, reinstall the drain

plug and pour tap water through the water supply port
of the radiator.

7) When the system is filled with water, remove the drain

plug, idle the engine and wash the cooling water system
with running water until clean water comes out.
While washing with running water, always keep the wa-
ter system filled with water by adjusting the amount of
water to be drained out and poured in.
Hold the water supply hose securely during washing
with running water so that the hose should not come off
from the water supply port of the radiator.

3-35
25. Procedures for Maintenance

8) After washing with running water, stop the engine, stop

pouring water, drain water completely and then install
the drain plug.

9) Pour water mixed with anti-freeze through the water

supply port of the radiator to fill it up.

10) To release air, idle the engine for 5 to 6 minutes and

then run the engine without load at high speed for 5 to
6 minutes. (While running the engine, keep the radia-
tor cap removed.)

11) Approximately 5 minutes after stopping the engine,

pour water mixed with anti-freeze up to the water sup-
ply port of the radiator, and install and tighten the cap.

12) Drain the cooling water from the sub-tank (1), wash
the inside of the sub-tank (1) and pour water mixed
with anti-freeze up to the "FULL" level.

3-36
 25. Procedures for Maintenance

25-3. Checking before start-up

Check the items described here before starting the engine first in a day.

25-3-1. Checking and replenishing the cooling water

Normally do not open the radiator cap.

Check the cooling water in the sub-tank when the
engine is cool.

1) Open the engine hood rear cover to check to see that

the cooling water level is between the FULL and LOW
marks on the sub-tank (1) (illustrated in the right figure).
If the cooling water level is low, add cooling water to the
FULL mark through the port of the sub-tank (1). For the
cooling water to be used, refer to Section "21. Fueling,
Oiling and Greasing Based on Temperature Range".

2) Securely close the cap after replenishing.

3) If the sub-tank is empty, check the sub-tank for leaks

and then check the cooling water level in the radiator. If
the cooling water is insufficient, refill the radiator and
then the sub-tank with cooling water.

4) If the cooling water level is proper, close the engine hood

rear cover.

3-37
25. Procedures for Maintenance

25-3-2. Checking and replenishing the engine oil

• At operating temperature, the oil and dipstick ar-

eas are hot.
• Do not allow hot oil or components to contact the
skin to prevent bodily injury such as a burn.
Check oil level and refill oil after engine has
cooled down sufficiently.

1) Open the engine hood rear cover.

2) Pull out the oil dipstick (G) and wipe oil off it with a cloth.

3) Insert the oil dipstick (G) fully again and pull it out.

4) Check that the oil level is above the midpoint between

the upper and lower limit marks (H and L), which is a
proper level.
Open the cap of the oil supply port (F) and replenish oil
if the oil level is lower than the midpoint.
See Section "21. Fueling, Oiling and Greasing Based on
Temperature Range" for the engine oil to be used.

5) If the engine oil level is higher than the H mark, drain the
excessive engine oil through the drain plug (P), and
check the engine oil level again.

6) If the engine oil level is proper, securely close the port

cap and close the engine hood rear cover.

Note :
When checking the engine oil level after the engine has
been run, stop the engine and wait for 15 minutes at least
before checking.
If the machine is inclined, make it horizontal before check-
ing the engine oil level.
Do not discard the excessive engine oil onto the ground or
the road.

3-38
 25. Procedures for Maintenance

25-3-3. Checking and replenishing the fuel in the fuel tank

Be careful not to overfill the fuel tank because it

could cause a fire. If the fuel tank is overfilled,
completely wipe off the spilled fuel.

• Do not remove the strainer from the fuel supply

port of the fuel tank when supplying fuel.
• Be careful not to allow water settled at the bot-
tom of the fuel container or dirt on refueling
equipment to come into the fuel tank.

1) Turn the starter switch to the "ON" position. Check the

fuel level with the fuel gauge and pour the fuel through
the fuel supply port.
When the fuel meter pointer indicates to “E”, approxi-
mately 1.45 Gals. (5.5 L) of fuel is left in the tank.

Capacity...7.52 Gals. (28.5 L)

See Section "21. Fueling, Oiling and Greasing Based

on Temperature Range" for the fuel to be used.

2) After refueling, securely retighten the fuel port cap.

Note :
If the breather hole (1) in the cap is clogged, the pressure
in the tank may decrease and the fuel may not be delivered
adequately to the engine. Clean the engine breather hole
from time to time.

3-39
25. Procedures for Maintenance

25-3-4. Checking and replenishing the hydraulic oil in the hydraulic oil tank

When removing the plug of the oil supply port,

slowly loosen it to release the internal pressure
from the tank, or the oil will spout from the tank.

1) Park the machine as illustrated in the right figure. If the

machine is not in the posture in the right figure, start the
engine, retract the bucket and arm cylinders to their
stroke ends at low speed, lower the boom until the
bucket teeth is put on the ground, lower the blade to the
ground, and stop the engine.

2) Check the oil level with the oil level gauge on the right
side of the machine. Check that the oil level is between
the upper and lower limit marks.

IMPORTANT
Do not replenish hydraulic oil above the upper limit
mark on the oil level gauge. An excessive amount of
hydraulic oil may damage the hydraulic system by
placing stress on its components, causing a danger-
ous high-pressure leak.

3) Open the engine hood B and replenish oil if the oil level
is below the lower limit.
See Section "21. Fueling, Oiling and Greasing Based
on Temperature Range" for the hydraulic oil to be used.

Note :
As the oil level differs with the oil temperature, check the
oil level by referring to the following guidelines:
• Before start-up : Near the middle of the oil level gauge
[oil temperature 50 to 86°F (10 to 30°C)]
• During normal operation : Near the upper limit of the oil
level gauge [oil temperature 122 to 176°F (50 to 80°C)]

3-40
 25. Procedures for Maintenance

25-3-5. Checking and adjusting the fan belt tension

1) Open the engine hood rear cover.

2) Press the fan belt between the fan pulley and the gen-
erator with a finger to check the fan belt tension.
• Pressing load : Approximately 72.3 ft•lbf (98.1 N•m)
• Adequate slack : 0.4 to 0.6 in. (10 to 15 mm)

3) Adjust the tension if necessary.

See Section "25-6. Maintenance every 200 service
hours" for the adjustment procedure.

4) When the tension is proper, close the engine hood rear

cover.

25-3-6. Checking and replenishing the battery electrolyte

• The battery generates flammable gas and can

cause a fire and an explosion.
Keep sparks, flames and lit cigarettes away from
the battery.
• Battery electrolyte is strong acid. To avoid seri-
ous injury, do not allow the electrolyte to contact
your skin or splash into your eyes.
• Always wear the safety goggles and protective
clothing.

1) Open the engine hood B to check the electrolyte level

and discharge state of the battery with the indicator of
the battery.

How to see the indicator:

(Blue) : Normal

(Red) : Shortage of battery electrolyte.

: Replenish distilled water.
(White) : Shortage of battery charge.
: Recharge the battery.

3-41
25. Procedures for Maintenance

25-3-7. Greasing „ Implement

IMPORTANT
Grease the fittings thoroughly after washing the ma-
chine or after operation in rain, on soft ground, or in
muddy water.

1) Put the bucket and the blade on the ground and stop the
engine.
2) Clean the grease nipples indicated with the arrows in
the right figures and grease them using a grease gun.
3) After greasing, wipe off the excessive grease with
waste cloth or the like.

„ Blade

3-42
 25. Procedures for Maintenance

25-3-8. Checking the electrical equipment

Whenever a fuse blows out frequently, contact

your dealer for the cause and repair.

Check fuses for damage, wiring for poor connections or

short circuits, and battery terminals for corrosion or loose
fits. Take corrective action.
Check the following items after the starter switch is turned
to the "ON" position.

1) Check the monitor functions

• Check the fuel gauge, the water temp. meter and the
hourmeter functions.
• Check engine oil pressure alarm lamp, battery charge
alarm lamp and water temperature alarm lamp for light-
ing.

2) Check that all switches function correctly and lamps

light correctly.
• Operation of the headlight and the boom light.

3-43
25. Procedures for Maintenance

25-4. Maintenance every 50 service hours

25-4-1. Greasing the swing gear and the swing bearing

Do not swing the upperstructure while greasing.

Swing the upperstructure after each stage of greas-
ing is completed to avoid serious bodily injury.

1) Grease the swing gear and bearing through the grease

nipples indicated with the arrows in the right figure, us-
ing a grease gun.

2) Swing the upperstructure little by little to grease them

until the upperstructure makes a full turn.

25-4-2. Draining the water and deposits in the fuel tank

Keep sparks, flames and lit cigarettes away.

„ Things to prepare
• Container for fuel waste
1) Swing the upperstructure so that the drain cock under
the fuel tank is positioned in the middle of the right and
left crawlers.

2) Put the container for fuel waste under the drain cock.

3) Set the drain cock to the open position to drain the water
and dirt deposits in the fuel tank.
Take care that the fuel does not splash your body.

4) When clean fuel starts coming out, set the drain cock to
the closed position and install the cover.

3-44
 25. Procedures for Maintenance

25-4-3. Cleaning the water separator element

• Keep sparks, flames and lit cigarettes away.

• At the operating temperature, the engine compo-
nents are hot and can cause a burn.
• Disconnect the ground of the battery and clean the
element after the engine has cooled sufficiently.
• Fuel oil leaked or spilled onto hot surfaces or
electrical components could cause a fire.
• Drain the fuel from the water separator into a
container before removing the water separator
retainer ring.

„ Things to prepare
• Container for fuel waste

1) Open the engine hood rear cover.

2) Place the container for fuel waste under the water sep-
arator.

3) After setting the water separator cock to the closed po-

sition, loosen the retainer ring to remove the cup, and
drain water from the cup.
Do not lose the red ring in the cup.

4) Remove the element and clean it and the inside of the

cup using light oil or wash oil.

5) Check the O-ring and if it is damaged or deformed, re-

place it with a new one.

6) Install the element and the cup and turn the cock to the
open position.

7) Close the engine hood rear cover.

3-45
25. Procedures for Maintenance

25-4-4. Cleaning the fuel filter element

• Keep sparks, flames and lit cigarettes away.

• At the operating temperature, the engine compo-
nents are hot and can cause a burn.
• Disconnect the ground of the battery and clean the
element after the engine has cooled sufficiently.
• Fuel oil leaked or spilled onto hot surfaces or
electrical components could cause a fire.
• Drain the fuel from the water separator into a
container before removing the water separator
retainer ring.

„ Things to prepare
• Container for fuel waste

1) Open the engine hood rear cover.

2) Put the container for fuel waste.

3) After setting the fuel filter cock to the closed position,

loosen the retainer ring to remove the cup.

4) Remove the element and clean it and the inside of the

cup using light oil or wash oil.

5) Check the O-ring and if it is damaged or deformed, re-

place it with a new one.

6) Install the element and the cup and turn the cock to the
open position.

7) Close the engine hood rear cover.

25-5. Maintenance every 100 service hours

Perform the same maintenance every 50 service hours.

3-46
 25. Procedures for Maintenance

25-6. Maintenance every 200 service hours

Also perform the maintenance every 50 and 100 service
hours.

25-6-1. Replacing the engine oil and the engine oil filter element

• Do not replace the oil immediately after the en-

gine stops to prevent bodily injury, because all
the components are hot.
• Do not allow hot oil or components to contact
skin.
• Replace the oil and the filter element after the oil
and the components have cooled sufficiently.

„ Things to prepare
• Replacement new oil : 3.7 Qts. (3.5 L)
• Container for waste oil : Capacity of 3.7 Qts. (3.5 L) or more
• Filter wrench for engine oil filter cartridge

1) Swing the upperstructure so that the drain plug on the

bottom of the engine is positioned in the middle of the
right and left crawlers.

2) Remove the cover under the machine body put the con-
tainer for waste oil under the drain plug.

3) Slowly remove the drain plug (P) so that the oil should
not splash your body and drain the waste oil.

4) Check the waste oil, and contact your dealer if a lot of

metallic particles or foreign objects are mixed in it.

5) Reinstall the drain plug (P).

6) Turn the oil filter cartridge (1) counterclockwise with the

filter wrench to remove it.
After removing the oil filter, wait for 10 to 15 minutes.

7) Wipe the dirt and oil from the filter mount and apply en-
gine oil (or apply grease lightly) to the seal surface of a
new oil filter and mount the filter.

3-47
25. Procedures for Maintenance

8) When mounting the filter, turn it 2/3 of a turn after the

seal surface has contacted with the filter mount.

9) After replacing the oil filter (cartridge), supply engine oil

to the upper limit mark on the oil dipstick through the oil
supply port (F).
Refer to Section "21. Fueling, Oiling and Greasing
Based on Temperature Range" for the oil to be used.

10) Idle the engine for several minutes and then stop the
engine. Then check that the oil level exceeds the mid-
point between the upper and lower limit marks on the
oil dipstick.
Refer to Section "25-3. Checking before start-up".

11) Install and tighten the oil supply port cap securely.

12) Mount the cover under the body.

Replace the engine oil and the oil filter element 6 months
after the previous replacement, even if the service hours
have not reached 200 hours.
Also replace them at 200 service hours, even if 6 months
has not elapsed since the previous replacement.

3-48
 25. Procedures for Maintenance

25-6-2. Checking and adjusting the fan belt tension

„ Checking the fan belt tension

• Stop the engine, take out the starter switch key,

and attach the "SERVICING IN PROGRESS" tag
to a control lever.
• The fan belt is hot immediately after the engine is
stopped.
Do not adjust the fan belt tension immediately af-
ter stopping the engine.
• Adjust the fan belt tension after all parts of the
engine have fully cooled down.

Fan belt
Pressing load 72.3 ft•lbf (98.1 N•m)
Adequate slack 0.4 to 0.6 in. (10 to 15 mm)

„ Adjusting the fan belt tension

„ Things to prepare
• Wooden bar (the handle of a hammer or the like)

1) Remove the lever stand (R).

2) Loosen the generator mounting bolts.

3) Insert a wooden bar between the generator and the cyl-

inder block, and move the generator so that the fan belt
tension will be slacked approximately 0.4 to 0.6 in. (10
to 15 mm) with a pressing load of 72.3 ft•lbf (98.1 N•m).

4) Retighten the mounting bolts to secure the generator.

5) Check the pulleys, the V-groove, and the fan belt for
damage, and check to see that the fan belt does not
touch the bottom of the V-groove.

6) If the fan belt cannot be adjusted since it has lost its

elasticity or if it is damaged or cracked, replace the fan
belt with a new one.
[Fan belt size] (Inch)
Model Size
Fan belt ViO20-2 HM33

3-49
25. Procedures for Maintenance

25-6-3. Checking and cleaning the air cleaner

• Never attempt to clean and replace the air clean-

er while the engine is running.
Be sure to stop the engine when checking and
cleaning it.
• Compressed air is used to clean the element. At
that time, be sure to wear safety goggles to pre-
vent scattered dust from coming into your eyes.
• The maximum air pressure should be less than
100 PSI (0.7 MPa) for cleaning purposes.

„ Cleaning procedure for element

1) Open the engine hood rear cover.

2) Remove the clip and remove the dust cup.

3) Remove the element.

Cover the connector side in the back of the air cleaner
body with a waste cloth and tape to prevent dirt from en-
tering.

4) Clean the dust cup and the inside of the body.

5) Blow dry compressed air [100 PSI (0.7 MPa) or less]

from inside the element along the pleats to initially re-
move the dirt. Then blow compressed air from outside
the element along the pleats to remove dirt. The blow
compressed air again from inside the element.

3-50
 25. Procedures for Maintenance

6) After cleaning, illuminate the element from inside with a

light bulb to check it. If there are any small holes or thin-
ner parts, replace the element with a new one.

IMPORTANT
• When cleaning the element, do not tap it or strike it
against other objects. Otherwise the element may be
damaged.
• Do not reuse the element if the pleat, gasket or seal
is damaged.
• Wrap an unused element with paper and store it in a
dry place.

7) Remove the clean cloth and the tape used to cover the
connector in the back of the body.

8) Mount the cleaned element.

9) Install the dust cup while checking the arrow on it.

10) Close the engine hood rear cover.

3-51
25. Procedures for Maintenance

25-6-4. Checking and cleaning the radiator fins

• Never attempt to check and clean the radiator fin

while engine is running. Be sure to stop the en-
gine when checking and cleaning it.
• Compressed air can cause bodily injury since
the objects around the radiator fin may scatter.
• Whenever using compressed air for cleaning,
check that there are no people around there and
wear safety goggles, clothing and shoes.
• The maximum compressed air pressure should
be less than 100 PSI (0.7 MPa) for cleaning pur-
poses.

1) Open the engine hood rear cover and the engine hood
B.

2) Remove the engine hood R.

3) Clean off the mud, dirt or leaves clogged in the radiator

fin by blowing compressed air or by flushing with steam.

IMPORTANT
• Always blow the compressed air a little away from
the fin to prevent damage to the fin.
• The damaged fin will cause water leakage and over-
heating.

4) Check that the radiator fins are straight and all the dirt
is removed completely.

5) Reinstall the engine hood R.

6) Close the engine hood B and the engine hood rear cov-
er.

3-52
 25. Procedures for Maintenance

25-6-5. Adjusting the governor lever and accelerator device

The governor lever and the accelerator devices (accelera-
tor lever, petal, etc.) of the auxiliary machinery are con-
nected by an accelerator wire.
If the wire becomes stretched or the connections loose de-
viation in the position may result and make operation un-
safe. Inspect the wire periodically and adjust if necessary.

1) Check to see that the governor lever on the engine side

is touching the restraint bolt of the high speed side
when the accelerator device is in the high speed posi-
tion.
2) Check to see that the governor lever is touching the re-
straint bolt of the low speed side when the accelerator
device is in the low speed position.
3) If the governor lever does not touch the restraint bolt for
either the high or low speed side when you check them,
loosen the setting screws on the fittings for the acceler-
ator wire and adjust the position of the wire.

Never remove the restraint bolt for the fuel injec-

tion pump or the restraint bolt on the amount of
fuel injected. Doing so will impair safe operation
and lower the efficiency of the engine and shorten
its life.

3-53
25. Procedures for Maintenance

25-7. Maintenance every 250 service hours

Also perform the maintenance every 50 service hours.

25-7-1. Checking and replenishing the lube oil for the travel reduction gearbox

• The gear oil and casing of the reduction gearbox

are hot immediately after ceasing the machine
operation and can cause bodily injury.
Do not allow hot oil or gearbox to contact your
skin.
Replace the oil after the oil and the gearbox have
cooled sufficiently.
• At the operating temperature, the reduction gear-
box is hot and under pressure.
In such condition, the oil or the plugs may be
ejected violently, causing bodily injury. Remove
the plug slowly to release the residual pressure.

„ Things to prepare
• Container for oil
• Oil jug

1) Place the machine so that the oil supply port should be

at the top position as illustrated in the right figure.

2) Place the container for oil under the level port.

3) Remove the level port plug using a hexagon socket

screw key and check that the oil level reaches the lower
end of the plug port.

4) When the oil quantity is insufficient, replenish gear oil

through the oil supply port until gear oil overflows from
the level plug port.
See Section "21. Fueling, Oiling and Greasing Based
on Temperature Range" for the oil to be used.

5) Install the plug.

Tightening torque : 15.9 to 17.4 ft•lbf (21.6 to 23.5 N•m)

3-54
 25. Procedures for Maintenance

25-8. Maintenance every 400 service hours

Also perform the maintenance every 50, 100, and 200 ser-
vice hours.

25-8-1. Replacing the fuel filter element

• Keep sparks, flames and lit cigarettes away.

• At the operating temperature, the engine compo-
nents are hot and can cause a burn. Disconnect
the ground of the battery and replace the element
after the engine has cooled sufficiently.
The fuel leaked or spilled onto hot surfaces or
electrical components may cause a fire.

„ Things to prepare
• Container for fuel

1) Open the engine hood rear cover.

2) Place the container for fuel under the fuel filter.

3) Set the fuel filter cock to the closed position, loosen the
retainer ring to remove the cup, and remove the ele-
ment.

4) Clean the cup using light oil or wash oil and install a new
element.
Replace the O-ring when replacing the element.

5) After replacing the fuel filter element, fill up the fuel tank.

6) Turn the starter switch to the "ON" position.

7) Air is automatically released with the automatic air re-

leasing device.

3-55
25. Procedures for Maintenance

How to release air:

1) Fill up the fuel tank.
2) Set the accelerator lever to the "RUN" position.
3) Turn the starter switch to the "START" position to crank
the engine for approximately 10 seconds.
Air is automatically released and the engine starts.

IMPORTANT
If the engine is not started after this procedure, turn
the starter switch to the "OFF" position after 10 sec-
onds and at least a minute later turn it to the "START"
position again to restart the engine.

When you refuel, release air in the same way; that is, crank
the engine for 10 seconds four or five times.
After the engine starts, sometimes it revolves irregularly
and stops approximately 20 to 30 seconds later. In this
case, turn the starter switch to the "OFF" position, wait for
one minute or more and turn the starter switch to the
"START" position again.

3-56
 25. Procedures for Maintenance

25-8-2. Replacing the air cleaner element

Never attempt to replace the air cleaner element

while the engine is running.
Replace the air cleaner element after the engine
has been stopped and cooled sufficiently.

1) Open the engine hood rear cover.

2) Remove the clip to remove the dust cup.

3) Remove the element.

Cover the connector side in the back of the air cleaner
body with a clean cloth and tape to prevent dirt from en-
tering.

4) Clean the dust cup and the inside of the body.

Remove the clean cloth and the tape used to cover the
connector in the back side of the body.

5) Install a new element.

6) Install the dust cup, while checking the arrow on it.

7) Close the engine hood rear cover.

3-57
25. Procedures for Maintenance

25-9. Maintenance every 500 service hours

Also perform the maintenance every 50, 100, and 250 ser-
vice hours.

25-9-1. Replacing the hydraulic oil return filter element

The hydraulic oil and the tank are hot and under
pressure immediately after the engine stops. This
can cause bodily injury such as burns.
Be sure to replace the filter only when the hydrau-
lic oil tank is cool enough to touch the tank surface
with your bare hand after the engine is stopped.
If the cap of the tank is removed carelessly, the cap
may pop out due to the spring force applied to the
filter. Also, the hydraulic oil may spout out if the
pressure inside the tank is not released.
Slowly loosen the bolts to remove the cap.

1) Open the engine hood B and clean the cap-mounted

surface on the top of the hydraulic oil tank using waste
cloth.

2) Slowly loosen the bolts to release the internal pressure

and remove the cap.

3) Remove the filter and install the valve to a new filter,

then install the filter into the tank.

IMPORTANT
Do not allow any dirt to enter the tank when installing
the return filter.

4) Clean the cap mounting surface using waste cloth and

check the O-ring. If the O-ring is damaged, replace it
with a new one and then reinstall the cap.

5) Close the engine hood B.

3-58
 25. Procedures for Maintenance

25-10. Maintenance every 1000 service hours

Also perform the maintenance every 50, 100, 200, 250 and 500 service hours.

25-10-1. Replacing the lube oil for the travel reduction gearbox

• The gear oil and casing of the reduction gearbox

are hot immediately after ceasing the machine op-
eration and can cause bodily injury such as a burn.
Do not allow hot oil or gearbox to contact your skin.
Replace the oil after the oil and the gearbox have
cooled enough to touch the surface of the gear-
box casing with your bare hand.
• At the operating temperature, the reduction gear-
box is hot and under pressure. In such condition,
the oil or the plugs may be ejected violently,
causing bodily injury. Loosen the plug slowly to
release the residual pressure.

„ Things to prepare
• Container for waste oil : Capacity of 0.37 Qts. (0.35 L) or more
• New oil : 0.37 Qts. (0.35 L) for right and left each
• Oil jug : Capacity of 0.37 Qts. (0.35 L) or more

1) Place the machine so that the oil supply port (common to

the drain port) should be in the lowest position as illustrat-
ed in the right figure.
2) Put the container for the waste oil under the oil supply port.
3) Remove the oil supply port, and level port plugs with a
hexagon socket screw key to drain the waste oil.
4) After finishing draining the waste oil, reinstall the plug
into the oil supply port.
5) Rotate the travel reduction gearbox and place the oil
supply port (common to the drain port) at the top as il-
lustrated at right.
6) Replenish gear oil to the specified level through the oil
supply port. Refer to Section "21. Fueling, Oiling and
Greasing Based on Temperature Range" for the oil to
be used.
7) When the oil overflows from the level port, reinstall the
oil supply port and level port plugs.
[Tightening torque : 15.9 to 17.4 ft•lbf (21.6 to 23.5 N•m)]

3-59
25. Procedures for Maintenance

25-10-2. Replacing the hydraulic oil and cleaning the suction filter element

• The hydraulic oil and the tank are hot and under
pressure at the operating temperature. Never re-
place the oil immediately after the operation is
stopped. Wait until the tank has cooled enough
to touch its surface with your bare hand.
• Remove the oil supply port cap and replace the
filter only when the engine is stopped.
• When removing the oil supply port cap, slowly
loosen it to release the internal pressure, then re-
move the cap carefully.
• If the cover of the tank is removed carelessly, the
cover may pop out due to the spring force ap-
plied to the filter. Also, the hydraulic oil may
spout out if the pressure inside the tank is not re-
leased. Slowly loosen the three bolts diagonally
to remove the cover.

„ Things to prepare
• Container for waste oil : Capacity of 7.9 Gals. (30 L) or more
• New hydraulic oil : 7.9 Gals. (30 L)
[When all oil is drained from all of the hydraulic equipment, pipes
and hoses, the required new oil amount is 9.24 Gals. (35 L)].
• O-ring

1) Swing the upperstructure so that the drain plug at the

bottom of the hydraulic oil tank is positioned in the mid-
dle of the right and left crawlers.
2) Retract the bucket and arm cylinders to their stroke ends,
lower the boom and put the bucket teeth on the ground.
3) Put the blade on the ground and stop the engine.
4) Remove the cover plate.
5) Remove the side weight R and the bracket.
6) Put the container for waste oil under the drain plug.
7) Remove the drain plug and drain the waste oil. When
removing the drain plug, take care that the oil does not
splash your body.
8) Clean the area around the oil supply port on the top of
the hydraulic oil tank using a waste cloth. Slowly loosen
the oil supply port cap.

3-60
 25. Procedures for Maintenance

9) Check the drain plug for metallic particles and remove

them if there are any particles on the plug.

10) Degrease and wash the threads of the plug, and re-
place the O-ring installed onto the plug with a new one.

11) After draining the waste oil, install and tighten the drain plug.
Tightening torque : 115.7 to 137.4 ft•lbf (156.9 to 186.3 N•m)

12) Loosen the hose band (1) to remove the suction hose
(2) from the flange (4).

13) Loosen the bolt (3), and remove the suction filter with
the flange (4). Remove the dirt from the filter and wash
it with clean wash oil or light oil.

14) Check the filter and the O-ring installed onto the flange
(4). If the filter or the O-ring is damaged or cracked, re-
place the filter with a new one and install it in the tank.

15) Install the suction hose onto the flange (4), and tighten
the hose band (1).

IMPORTANT
Do not allow any dirt to enter the tank when installing
the filter.

16) Put oil to the specified level through the oil supply port (F).
Check the oil level with the oil level gauge on the right
side of the machine and do not put oil beyond the mid-
point between the upper and lower limit marks on the
oil level gauge.
See Section "21. Fueling, Oiling and Greasing Based
on Temperature Range" for the oil to be used.

17) Check the O-ring of the oil supply port (F). If it is dam-
aged, replace it with a new one, and then reinstall the
oil supply port (F).

18) After replacing the oil, set all control levers to the neu-
tral position and idle the engine for approximately 2 to
3 minutes and then control each implement to check
their operation.

19) Reinstall the cover plate.

20) Reinstall the bracket and the side weight R.

3-61
25. Procedures for Maintenance

25-10-3. Checking and adjusting the intake/exhaust valve clearances

Ask your dealer for checking and adjusting.

25-10-4. Checking and adjusting the fuel injection valve

Ask your dealer for checking and adjusting.

25-10-5. Retightening the cylinder head bolts

Ask your dealer for retightening.

3-62
 25. Procedures for Maintenance

25-11. Maintenance every 2000 service hours

Also perform the maintenance every 50, 100, 200, 250, 400, 500 and 1000 service hours.

25-11-1. Check and replace fuel oil pipe, cooling water pipe
Ask your dealer.

25-11-2. Lapping the intake / exhaust valve

Ask your dealer.

25-11-3. Check fuel pump adjust

Ask your dealer.

3-63
 MEMO

3-64
SPECIFICATIONS AND
DIMENSIONAL DIAGRAMS

4-1
 26. Specifications and Dimensional Diagrams
„ Specifications
Type ViO20

Rubber crawler

Items Canopy Cabin

• Weight (in compliance with SAE standards)

Operating mass lbs. (kg) 4884 (2215) 5116 (2320)

Machine mass (without implement) lbs. (kg) 3594 (1630) 3826 (1735)

• Working range and performance

Bucket capacity, standard cu.ft (cu.m) 2.33 (0.066)

Bucket width, standard in. (mm) 19.3 (490)

Maximum digging depth <at down the blade> in. (mm) 98.6 (2505) <105.9 (2690)>

Maximum vertical wall digging depth in. (mm) 82.9 (2105)

Maximum cutting height in. (mm) 157.3 (3995)

Maximum dumping height in. (mm) 107.8 (2740)

Maximum digging radius of the ground in. (mm) 167.6 (4255)

Front minimum swing radius <at swinging the boom> in. (mm) 71.5 (1817) <69.8 (1772)>

Boom swing angle : left / right degrees 47 / 75

Maximum digging force (bucket) lbs. (k•N) 4189.5 (18.6)

Travel speed : high / low MPH (km / h) 2.6 (4.2) / 1.2 (2.0)

Swing speed rpm 9.5

Average ground pressure, standard crawler PSI (kPa) 5.4 (37.2) 5.7 (39.0)

5.70 (21.6)¯2 <Variable displacement pump>

Hydraulic pump displacement GPM (L / min)
5.57 (21.1)¯1 <Gear pump>

System relief set pressure PSI (MPa) 2986 (20.6)¯3, 2422 (16.7)¯1

• Engine

Type - Vertical three cycle water-cooled diesel engine

Model - 3TNE74-ENVE

Rated output/revs HP (kW) / rpm 17.85 (13.3) / 2400

Displacement cu.in. (cu.cm) 61.4 (1006)

Compression pressure PSI (MPa) 497.7 (3.4) at 250 RPM

Nozzle injection pressure PSI (MPa) 1706 (11.8)

Fan belt (V-belt) size - FM35.5

Generator capacity V/A 12 / 40

• Battery type and capacity......65B24L / 12V, 40Ah (5 hours rate capacity)

4-2
 26. Specifications and Dimensional Diagrams

„ Model view and working range Unit : in. (mm)

For canopy type

4-3
26. Specifications and Dimensional Diagrams

„ Model view and working range Unit : in. (mm)

For cabin type

4-4
OPTIONAL PARTS AND
ATTACHMENTS

5-1
 27. General Precautions

27-1. Safety precautions

The mounting of attachments and optional parts that are not authorized by YANMAR may cause acci-
dents as well as shorten the machine life.
If you need to mount any attachments other than those described in this manual, contact your dealer. If
you fail to do so, the installation and use of unauthorized attachments and parts may void your Warranty.

Precautions for mounting and dismounting an attachment

When mounting or dismounting an attachment, observe the following precautions for safety.
• When mounting or dismounting a heavy implement or attachment, place the machine on
level, solid ground.
• When you work together with a partner, define hand signals and communicate in accor-
dance with those signals.
• When moving a heavy load [more than 55.1 lbs. (25 kg)], use a crane.
• When removing a heavy part, be sure to support it adequately.
When lifting such a part with a crane, be aware of its center of gravity.
• Do not mount or dismount a heavy part while suspending it with a crane. Be sure to support
it securely on a stable base.
• Securely support any attachment that has been removed or is to be installed, and take ad-
equate precautions not to let it fall down.
• Never stand directly under a load suspended by a crane.
Stand far enough away to be safe if the load should fall.

IMPORTANT
Comply with all licensing requirements before operating a crane.
Do not permit an unauthorized person to operate a crane.
For more information about the procedures for mounting and dismounting attachments, ask your
dealer.

5-2
 27. General Precautions

27-2. Precautions for mounting an attachment (implement)

A long implement may throw a machine off balance, and may cause the machine to roll over
when the machine descends or swings on a slope.
The following operations are especially dangerous, and must never be done.
• Descending a slope with • Traversing across a slope • Swinging on a slope
the implement raised

90 degrees to
110 degrees Earth laid
on the
ground

7.87 to 11.8 in. (20 to 30 cm)

• If you mount an unusually heavy implement (attachment) on the machine, the inertia of the
upperstructure will increase so that the upperstructure will continue to turn over a longer
distance after it has been deactivated. This can mislead the operator about the safe dis-
tance between the swinging implement and an object nearby and could cause the imple-
ment to bump against the object. To avoid this type of accident, deactivate the
upperstructure a little earlier than usual. Because of increased inertia, the implement will
also drop a greater distance after it has been stopped in mid-air. (The unintentional drifting
of the implement will be greater).
• Be sure that the boom and the arm have been mounted correctly. Otherwise, serious acci-
dents or damage may occur. If you do not know how to mount the boom or the arm correctly,
ask your dealer.
• If you mount a long implement, you may misjudge the distance between the implement and
a nearby object, and cause the implement to bump against the object.
Be sure to provide adequate clearance between long implements and nearby objects.

5-3
 28. Handling the Hooked Bucket

28-1. Checking the hooked bucket for damage

Check the hook, the lock, and the hook mounting base for
damage.
If any damage is found, ask your dealer to repair the buck-
et.

28-2. Prohibitions

„ Do not suspend a load without the dedicated hook

A dedicated hook is required to suspend a load with the
machine.
For the details, ask your dealer.

28-3. Precautions

„ Precautions for suspending a load

• Reduce the engine speed when suspending a load.
• The wire rope or the suspending ring may slip off the
bucket hook if the hook is not maintained in a vertical po-
sition due to the working posture of the machine. Be
careful to maintain a vertical hook position, so that the
wire rope or the suspending ring will not slip off.

• When the hooked bucket is used in a reverse position,

take care that the bucket hook should not interfere with
the arm when dumping the bucket.
• Ask your dealer to mount a hook on the bucket.

5-4
 29. Optional Parts and Attachments

29-1. Optional parts and attachments

The following options are available. Select options useful for your work.
If you need an option, contact your dealer.
• Bucket (Teeth...Point type)
Width in. (mm) Capacity cu.ft (cu.m) Remarks

11.4 (290) 1.17 (0.033)

13.4 (340) 1.55 (0.044)

15.4 (390) 1.94 (0.055)

17.3 (440) 2.12 (0.060)

5-5
 MEMO

5-6
 30. Noise, vibrations, fittings

RESULT OF MEASURING:

ViO20
LwA (dBA) 93
LwA (dBA)

LpA (dBA): Weighted sound pressure level at the operator’s ear.

LwA (dBA): Weighted power level.

In those conditions:

- Machine at "statical" position.

- Engine running at rated output.

Mesured in accordance with 2000/14/EC.

VIBRATIONS EMITTED BY MACHINE:

1) The weighted root means square acceleration value to which the arms are subjected :
under 2,5 m/s².
2) The weighted root means square acceleration value to which the body is subjected :
under 0,5 m/s².

Measuring conditions :

- Every 200 rpm from low idle to high idle speed.

- Back and, lateral and vertical directions.

5-70-2
31. Tecnical Data

Lifting Capacity List

Standard Arm Type
With:
(„ Cabin Canopy) Type
A
( Steel „ Rubber) Crawler
Bucket width : 490 mm; weight : 52 Kg

P
A : Reach from swing center line [in. (m)]
B : Load point height [in. (m)]
B
C C : Lifting load [lbs. (kg)]
P : Load point
: Rating over front
: Rating over side or 180 degrees

Blade on ground Unit : lbs. (kg)

A [in. (m)] Max. 3.0 2.5 2.0

B [in. (m)]
3.4 *390 *390 − − - - − −
2.5 290 *405 − − *335 *335 − −
2.0 245 *405 320 *400 *390 *390 − −
1.5 215 *425 305 *530 *495 *495 - -
1.0 200 *425 270 *510 420 *615 605 *790
0.0 210 *460 290 *600 390 *770 515 *1095
-1.0 275 *475 - - 375 *700 515 *980
-1.5 360 *500 − − - - 540 *735

5-8-1 4780203
31. Tecnical Data

Blade above ground Unit : lbs. (kg)

A [in. (m)] Max. 3.0 2.5 2.0

B [in. (m)]
3.4 *390 *390 − − - - − −
2.5 290 320 − − *335 *335 − −
2.0 245 275 320 *400 *390 *390 - -
1.5 215 245 305 335 *495 *495 - -
1.0 200 240 270 350 420 470 605 *790
0.0 210 245 290 335 390 440 515 605
-1.0 275 305 - - 375 435 515 620
1.5 360 440 − − - - 540 615

Note :
The lifting load with the asterisk (*) mark is limited by hydraulic lifting capacity rather than tipping. The lifting capacity
shown in the above list is based on the ISO Standard No. 10567 and represents either 87 % of hydraulic lifting
capacity or 75 % of tipping load, which is smaller.

5-9 -2 4780203
NOTES

6-1
30.
2 Maintenance Log

Maintenance log
Date Machine hours Service performed

6-2
 30. Maintenance Log
32.

Date Machine hours Service performed

6-3
30.
32.Maintenance Log

Date Machine hours Service performed

6-4
 30.
32. Maintenance Log

Date Machine hours Service performed

6-5
33. Notes
31.
Notes

6-6
 33.
31. Notes

6-7
33.Notes
31.

6-8
 33.Notes
31.

6-9
 MEMO

6-10
CONSTRUCTION EQUIPMENT DIVISION
1717-1, Kumano, Chikugo, Fukuoka, 833-0055 Japan
Telephone : 0942-53-5465
Facsimile : 0942-53-5132