Operación y Mantenimiento

TEN00034-00
(Replaces SEAM043604T)
Operation & Maintenance

Manual
D275AX-5
BULLDOZER
SERIAL NUMBERS D275AX-5 20164 and up
This material is proprietary to Komatsu America Corp. and is not to be reproduced, used, or disclosed except in
accordance with written authorization from Komatsu America Corp.
It is our policy to improve our products whenever it is possible and practical to do so. We reserve the right to make
changes or improvements at any time without incurring any obligation to install such changes on products sold
previously.
Due to this continuous program of research and development, revisions may be made to this publication. It is
recommended that customers contact their distributor for information on the latest revision.
Copyright 2005 Komatsu

Printed in U.S.A.
Komatsu America Corp.
January 2005
.
1-1
.
FOREWORD FOREWORD
FOREWORD
This manual provides rules and guidelines which will help you use this machine safely and effectively. The
precautions in this manual must be followed at all times when performing operation and maintenance. Most
accidents are caused by the failure to follow fundamental safety rules for the operation and maintenance of
machines. Accidents can be prevented by knowing beforehand conditions that may cause a hazard when
performing operation and maintenance.
WARNING
Before beginning operation or maintenance, operators and maintenance personnel must always observe the following points.
Read this manual thoroughly and understand its contents fully.
Read the safety messages and safety labels given in this manual carefully so that they should be understood fully.
Keep this manual at the storage location for the Operation and Maintenance Manual given below so that all personnel involved
in working on the machine can consult it periodically.
In case this manual should be lost or damaged, immediately contact Komatsu or your Komatsu distributor to obtain a new copy.
When you sell the machine, make sure that this manual should be provided to the new owner together with the machine.
In this manual, measurements are expressed in international standard units (SI). For the reference purpose, weight units used in
the past are also displayed in { }.
Location to keep operation & maintenance manual

In door pocket inside of cab door
1-2
.
FOREWORD FOREWORD
1-3
.
FOREWORD FOREWORD
1-4
.
FOREWORD SAFETY INFORMATION
SAFETY INFORMATION
To enable you to use this machine safely, safety precautions and labels are given in this manual and affixed to the
machine to give explanations of situations involving potential hazards and of the methods of avoiding such
situations.
Signal words
The following signal words are used to inform you that there is a potential hazardous situation that may lead to
personal injury or damage.
In this manual and on machine labels, the following signal words are used to express the potential level of hazard.
Indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
Indicates a potentially hazardous situation which, if not avoided, may result in minor or
moderate injury. This word is used also to alert against unsafe practices that may cause
property damage.
Example of safety message using signal word
WARNING
When standing up from the operator's seat, always place the lock lever in the LOCK position.
If you accidentally touch the control levers when they are not locked, this may cause a serious injury or death.
Other signal words
In addition to the above, the following signal words are used to indicate precautions that should be followed to
protect the machine or to give information that is useful to know.
This word is used for precautions that must be taken to avoid actions which could shorten
the life of the machine.
This word is used for information that is useful to know.
1-5
.
SAFETY INFORMATION FOREWORD
Safety labels
Safety labels are affixed to the machine to inform the operator or maintenance worker on the spot when carrying out
operation or maintenance of the machine that may involve hazard.
This machine uses "Safety labels using words" and "Safety labels using pictograms" to indicate safety procedures.
Example of safety label using words
Safety labels using pictogram

Safety pictograms use a picture to express a level of hazardous
condition equivalent to the signal word. These safety pictograms
use pictures in order to let the operator or maintenance worker
understand the level and type of hazardous condition at all times.
Safety pictograms show the type of hazardous condition at the top
or left side, and the method of avoiding the hazardous condition at
the bottom or right side. In addition, the type of hazardous condition
is displayed inside a triangle and the method of avoiding the
hazardous condition is shown inside a circle.
Komatsu cannot predict every circumstance that might involve a potential hazard in operation and maintenance.
Therefore, the safety messages in this manual and on the machine may not include all possible safety precautions.
If any procedures or actions not specifically recommended or allowed in this manual are used, it is your responsibility
to take the necessary steps to ensure safety.
In no event should you engage in prohibited uses or actions described in this manual.
The explanations, values, and illustrations in this manual were prepared based on the latest information available
at that time. Continuing improvements in the design of this machine can lead to changes in detail which may not
be reflected in this manual. Consult Komatsu or your Komatsu distributor for the latest available information of your
machine or for questions regarding information in this manual.
The numbers in circles in the illustrations correspond to the numbers in ( ) in the text. (For example: 1 -> (1))
1-6
.
FOREWORD INTRODUCTION
INTRODUCTION
This Komatsu machine is designed to be used mainly for the following work:
Dozing
Cutting into hard or frozen ground or ditching
Felling trees, removing stumps
Pushing
Ripping
For further details, see "WORK POSSIBLE USING BULLDOZER (PAGE 3-110)" and "RIPPER OPERATION
(PAGE 3-117)".
FRONT/REAR, LEFT/RIGHT DIRECTIONS OF MACHINE
In this manual, the terms front, rear, left, and right refer to the travel direction as seen from the operator's seat when
the operator's seat is facing the front and the sprocket is at the rear of the machine.
1-7
.
NECESSARY INFORMATION FOREWORD
NECESSARY INFORMATION
When requesting service or ordering replacement parts, please inform your Komatsu distributor of the following
items.
MACHINE SERIAL NO. PLATE AND POSITION

Under the front of the console box on the right side of the operator's seat.
ENGINE SERIAL NO. PLATE AND POSITION

This is at the rear of the exhaust manifold cover on the left side of the engine as seen from the fan.
(The EMISSION CONTROL INFORMATION LABEL is on the mounting bracket between the water separator and
the engine oil filter.)
EPA: Environmental Protection Agency, U.S.A.
1-8
.
FOREWORD NECESSARY INFORMATION
BLADE SERIAL NO. PLATE POSITION

This is located at the upper right of blade back surface.
RIPPER SERIAL NO. PLATE POSITION

This is located at the left side surface of ripper beam.
POSITION OF SERVICE METER

On top of the machine monitor
1-9
.
NECESSARY INFORMATION FOREWORD
TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
Machine serial No.
Engine serial No.
Distributor name
Address
Service Personnel
Phone/Fax
1 - 10
.
FOREWORD CONTENTS
CONTENTS
FOREWORD 1- 1
FOREWORD 1- 2
SAFETY INFORMATION 1- 5
INTRODUCTION 1- 7
FRONT/REAR, LEFT/RIGHT DIRECTIONS OF MACHINE 1- 7
NECESSARY INFORMATION 1- 8
MACHINE SERIAL NO. PLATE AND POSITION 1- 8
ENGINE SERIAL NO. PLATE AND POSITION 1- 8
BLADE SERIAL NO. PLATE POSITION 1- 9
RIPPER SERIAL NO. PLATE POSITION 1- 9
POSITION OF SERVICE METER 1- 9
TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR 1- 10
SAFETY 2- 1
SAFETY 2- 2
SAFETY LABELS 2- 4
POSITIONS OF SAFETY PICTOGRAMS 2- 4
SAFETY LABELS 2- 5
GENERAL PRECAUTIONS 2- 9
PRECAUTIONS FOR OPERATION 2- 17
BEFORE STARTING ENGINE 2- 17
OPERATION 2- 19
TRANSPORTATION 2- 23
BATTERY 2- 24
TOWING 2- 26
PRECAUTIONS FOR MAINTENANCE 2- 27
OPERATION 3- 1
GENERAL VIEW 3- 2
GENERAL VIEW OF MACHINE 3- 2
GENERAL VIEW OF CONTROLS AND GAUGES 3- 3
EXPLANATION OF COMPONENTS 3- 5
FRONT PANEL 3- 5
SWITCHES 3- 34
CONTROL LEVERS, PEDALS 3- 38
DUST INDICATOR 3- 46
POWER SOURCE 3- 47
FUSE BOX 3- 48
FUSIBLE LINK 3- 51
DOOR OPEN LOCK 3- 52
SASH GLASS INTERMEDIATE LOCK 3- 52
DOOR POCKET 3- 53
ASHTRAY 3- 53
TOOL BOX 3- 53
CAR STEREO, HANDLING 3- 54
AIR CONDITIONER, HANDLING 3- 62
ACCUMULATOR, HANDLING 3- 67
OPERATION 3- 68
CHECK BEFORE STARTING ENGINE, ADJUST 3- 68
STARTING ENGINE 3- 87
OPERATIONS AND CHECKS AFTER STARTING ENGINE 3- 90
1 - 11
.
CONTENTS FOREWORD
STOPPING ENGINE 3- 93
CHECK AFTER STOPPING ENGINE 3- 93
MOVING MACHINE OFF 3- 94
STOPPING MACHINE 3- 96
SHIFTING GEAR 3- 97
SHIFTING BETWEEN FORWARD AND REVERSE 3-100
STEERING MACHINE 3-102
PRECAUTIONS FOR OPERATION 3-105
PARKING MACHINE 3-107
CHECK AFTER FINISHING WORK 3-109
LOCKING 3-109
WORK POSSIBLE USING BULLDOZER 3-110
EFFECTIVE USE OF MODE SELECTION SYSTEM 3-112
RIPPER OPERATION 3-117
OPERATING METHOD FOR RIPPING OPERATIONS 3-120
ADJUSTING POSTURE OF WORK EQUIPMENT 3-124
TIPS FOR LONGER UNDERCARRIAGE LIFE 3-127
TRANSPORTATION 3-129
TRANSPORTATION PROCEDURE 3-129
LOADING, UNLOADING WORK 3-129
PRECAUTIONS FOR LOADING 3-129
METHOD OF LIFTING MACHINE 3-130
PRECAUTIONS FOR TRANSPORTATION 3-131
TRAVELING ON ROADS 3-131
REMOVAL OF CAB 3-131
INSTALLATION OF CAB 3-132
COLD WEATHER OPERATION 3-133
PRECAUTIONS FOR LOW TEMPERATURE 3-133
AFTER COMPLETION OF WORK 3-134
AFTER COLD WEATHER 3-134
LONG-TERM STORAGE 3-135
BEFORE STORAGE 3-135
DURING STORAGE 3-135
AFTER STORAGE 3-135
TROUBLESHOOTING 3-136
AFTER RUNNING OUT OF FUEL 3-136
METHOD OF TOWING MACHINE 3-137
IF BATTERY IS DISCHARGED 3-138
OTHER TROUBLE 3-141
WHEN MODE SELECTION SYSTEM FLASHES 3-146
MAINTENANCE 4- 1
GUIDES TO MAINTENANCE 4- 2
OUTLINES OF SERVICE 4- 5
HANDLING OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC 4- 5
OUTLINE OF ELECTRIC SYSTEM 4- 8
WEAR PARTS LIST 4- 9
RECOMMENDED FUEL, COOLANT, AND LUBRICANT 4- 10
USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE 4- 11
RECOMMENDED BRANDS, RECOMMENDED QUALITY FOR PRODUCTS OTHER THAN THAN
1 - 12
.
FOREWORD CONTENTS
KOMATSU GENUINE OIL 4- 12

STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS 4- 13
TORQUE LIST 4- 13
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS 4- 14
SAFETY CRITICAL PARTS 4- 15
MAINTENANCE SCHEDULE CHART 4- 16
MAINTENANCE SCHEDULE CHART 4- 16
SERVICE PROCEDURE 4- 19
INITIAL 250 HOURS SERVICE (ONLY AFTER THE FIRST 250 HOURS) 4- 19
WHEN REQUIRED 4- 20
CHECK BEFORE STARTING 4- 43
EVERY 250 HOURS SERVICE 4- 44
SPECIFICATIONS 5- 1
SPECIFICATIONS 5- 2
ATTACHMENTS, OPTIONS 6- 1
GENERAL PRECAUTIONS 6- 2
PRECAUTIONS RELATED TO SAFETY 6- 2
SELECTION OF TRACK SHOE 6- 3
SELECTION OF TRACK SHOES 6- 3
PROCEDURE FOR SELECTING RIPPER POINT 6- 4
PROCEDURE FOR SELECTING RIPPER POINT 6- 4
CAP WITH LOCK, HANDLING 6- 5
METHOD OF OPENING AND CLOSING CAP WITH LOCK 6- 5
EFFECTIVE METHOD OF OPERATION FOR DUAL TILT DOZER 6- 6
BLADE CONDITION 6- 6
DOZING WORK 6- 8
LEVELING (SPREADING) OPERATION 6- 11
DITCHING OPERATION 6- 11
BOULDER RAISING OPERATION 6- 11
SIDE-CUTTING OPERATIONS 6- 12
HORIZONTAL DOZING OPERATIONS FROM SIDE SLOPE (ROUGH GROUND) 6- 12
SHOE SLIP CONTROL 6- 13
MODE SELECTION SWITCH PANEL (SHOE SLIP CONTROL) 6- 13
EFFECTIVE USE OF MODE SELECTION SYSTEM 6- 14
IF MODE SELECTION SYSTEM FLASHES 6- 20
INDEX 7- 1
1 - 13
.
.
2-1
.
SAFETY SAFETY
SAFETY
Safety Labels 2- 4
Positions of Safety Pictograms 2- 4
Safety Labels 2- 5
General Precautions
Safety Rules 2- 9
If Abnormalities are Found 2- 9
Clothing and Personal Protective Items 2- 9
Fire Extinguisher and First Aid Kit 2- 9
Safety Features 2- 9
Keep Machine Clean 2- 10
Inside Operator's Compartment 2- 10
Always Apply Lock when Leaving Operator's Seat 2- 10
Handrails and Steps 2- 11
Mounting and Dismounting 2- 11
No People on Attachments 2- 11
Prevention of Burns 2- 12
Fire Prevention 2- 12
Action if Fire Occurs 2- 13
Window Washer Liquid 2- 13
Precautions when using ROPS 2- 13
Precautions for Attachments 2- 14
Cab Window Glasses 2- 14
Unauthorized Modification 2- 14
Safety at Worksite 2- 14
Working on Loose Ground 2- 14
Do not Go Close to High-Voltage Cables 2- 15
Ensure Good Visivility 2- 15
Ventilation for Enclosed Areas 2- 15
Checking Signalman's Signals and Signs 2- 16
Be Careful About Asbestos Dust 2- 16
2-2
.
SAFETY SAFETY
Precautions for Operation 2- 17

Before Starting Engine 2- 17
Checks Before Starting Engine 2- 17
Precautions when Starting 2- 17
Precautions in Cold Areas 2- 18
Operation 2- 19
Checks Before Operation 2- 19
Precautions for Moving Machine Forward or in Reverse 2- 19
Precautions when Traveling 2- 20
Traveling on Slopes 2- 21
Prohibited Operations 2- 21
Using Brakes 2- 21
Operate Carefully on Snow 2- 21
Parking Machine 2- 22
Transportation 2- 23
Shipping 2- 23
Battery 2- 24
Battery Hazard Prevention 2- 24
Starting with Booster Cable 2- 25
Towing 2- 26
When Towing 2- 26
Precautions for Maintenance 2- 27

Warning Tag 2- 27
Keep Work Place Clean and Tidy 2- 27
Appoint Leader when Working with Others 2- 27
Stop Engine Before Carrying Out Inspection and Maintenance 2- 28
Two Workers for Maintenance when Engine is Running 2- 29
Proper Tools 2- 29
Handling Accumulator 2- 30
Personnel 2- 30
Attachments 2- 30
Work Under the Machine 2- 31
Noise 2- 31
Precautions when Using Hammer 2- 31
Repair Welding 2- 31
Removing Battery Terminal 2- 31
Precautions when Using High-Pressure Grease to Adjust Track Tension 2- 32
Do not Disassemble Recoil Spring 2- 32
Precaution with High-Pressure Oil 2- 33
Precaution for High Fuel Pressure 2- 33
Handing High-Pressure Hoses 2- 33
Precaution for High Voltage 2- 33
Waste Material 2- 34
Maintenance for Air Conditioner 2- 34
Compressed Air 2- 34
Periodic Replacement of Safety Critical Parts 2- 34
2-3
.
SAFETY LABELS SAFETY
SAFETY LABELS
The following warning signs and safety labels are used on this machine.
Be sure that you fully understand the correct position and content of labels.
To ensure that the content of labels can be read properly, be sure that they are in the correct place and always
keep them clean. When cleaning them, do not use organic solvents or gasoline. These may cause the labels to
peel off.
There are also other labels in addition to the warning signs and safety labels. Handle those labels in the same
way.
If the labels are damaged, lost, or cannot be read properly, replace them with new ones. For details of the part
numbers for the labels, see this manual or the actual label, and place an order with Komatsu distributor.
POSITIONS OF SAFETY PICTOGRAMS
2-4
.
SAFETY SAFETY LABELS
SAFETY LABELS
(1) Caution before operating or maintaining machine
(09651-03001)
(2) Caution before moving in reverse (09802-13000)
(3) Caution for leaving operator's seat (09654-33001)
2-5
.
(4) Caution for high-temperature coolant (09668-03001)
(5) Caution for high-temperature hydraulic oil (09653-03001)
(6) Caution for check and adjust track tension (195-98-22931)
(7) Caution for handling electric wires (09808-03000)
2-6
.
SAFETY SAFETY LABELS
(8) Caution for engine running (09667-03001)
(9) Caution for handling accumulator (09659-53000)
(10) Caution for use of seat belt (195-98-12940)
(11) Caution for approach when machine moving (09812-03000)
2-7
.
(12) Warning for ROPS (09620-30201)
(13) Warning for battery (09664-30082)
2-8
.
SAFETY GENERAL PRECAUTIONS
GENERAL PRECAUTIONS
SAFETY RULES
Only trained and authorized personnel can operate and maintain the machine.
Follow all safety rules, precautions and instructions when operating or performing maintenance on the machine.
If you are under the influence of alcohol or medication, your ability to safely operate or repair your machine may
be severly impaired putting yourself and everyone else on your jobsite in danger.
When working with another operator or with a person on worksite traffic duty, be sure that all personnel
understand all hand signals that are to be used.
IF ABNORMALITIES ARE FOUND

If you find any problems in the machine during operation or maintenance (noise, vibration, smell, incorrect gauges,
smoke, oil leakage, etc., or any abnormal display on the warning devices or monitor), report to the person in charge
and have the necessary action taken. Do not operate the machine until the problem has been corrected.
CLOTHING AND PERSONAL PROTECTIVE ITEMS

Do not wear loose clothing and accessories. There is a hazard that they may catch on control levers or other
protruding parts.
If you have long hair and it hangs out from your hard hat, there
is a hazard that it may get caught up in the machine, so tie your
hair up and be careful not to let it get caught.
Always wear a hard hat and safety shoes. If the nature of the
work requires it, wear safety glasses, mask, gloves, ear plugs,
and safety belt when operating or maintaining the machine.
Check that all protective equipment functions properly before
using it.
FIRE EXTINGUISHER AND FIRST AID KIT

Always follow the precautions below to prepare for action if any injury or fire should occur.
Be sure that fire extinguishers have been provided and read the
labels to ensure that you know how to use them in emergencies.
Carry out periodic inspection and maintenance to ensure that
the fire extinguisher can always be used.
Provide a first aid kit at the storage point. Carry out periodic
checks and add to the contents if necessary.
SAFETY FEATURES
Be sure that all guards and covers are in their proper position. Have guards and covers repaired immediately if
they are damaged.
Understand the method of use of safety features and use them properly.
Never remove any safety features. Always keep them in good operating condition.
2-9
.
GENERAL PRECAUTIONS SAFETY
KEEP MACHINE CLEAN

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

When entering the operator's compartment, always remove all mud and oil from the soles of your shoes.
If you operate the pedal with mud or oil affixed to your shoes, your foot may slip and this may cause a serious
accident.
Do not leave parts or tools lying around the operator's compartment.
Do not stick suction pads to the window glass. Suction pads act as a lens and may cause fire.
Do not use cellular telephones inside the operator's compartment when driving or operating the machine.
Never bring any dangerous objects such as flammable or explosive items into the operator's compartment.
ALWAYS APPLY LOCK WHEN LEAVING OPERATOR'S SEAT

Before standing up from the operator's seat, lower the work
equipment completely to the ground, set work equipment lock
lever and parking lever securely to the LOCK position, then stop
the engine.
If you accidentally touch the levers when they are not locked,
there is a hazard that the machine may suddenly move and
cause serious injury or property damage.
When leaving the machine, always lower the work equipment

completely to the ground, set work equipment lock lever and
parking lever securely to the LOCK position, then stop the
engine. Use the key to lock all the equipment. Always remove
the key, take it with you, and keep it in the specified place.
2 - 10
.
HANDRAILS AND STEPS

To prevent personal injury caused by slipping or falling off the machine, always do as follows.
Use the parts marked by arrow A in the diagrams when getting
on or off the machine.
Never use the parts marked by arrow B when getting on or off
the machine. Use them only when moving along the top of the
track or when checking or carrying out maintenance inside the
side cover, or when filling the tank with oil.
Never jump on or off the machine. In particular, never get on or
off a moving machine. This may cause serious injury.
To ensure safety, always face the machine and maintain

three-point contact (both feet and one hand, or both hands and
one foot) with the handrails and steps (including the track shoe)
to ensure that you support yourself.
Do not grip the control levers, or work equipment lock lever
when getting on or off the machine.
Never climb on the engine hood or covers where there are no
non-slip pads.
Before getting on or off the machine, check the handrails and
steps (including the track shoe). If there is any oil, grease, or
mud on the handrails or steps (including the track shoe), wipe it
off immediately. Always keep these parts clean. Repair any
damage and tighten any loose bolts.
Do not get on or off the machine while holding tools in your hand.
MOUNTING AND DISMOUNTING

Never jump on or off the machine. Never get on or off a moving machine.
If the machine starts to move when there is no operator on the machine, do not jump on to the machine and try
to stop it.
NO PEOPLE ON ATTACHMENTS
Never let anyone ride on the work equipment, or other attachments. There is a hazard of falling and suffering serious
injury.
2 - 11
.
PREVENTION OF BURNS
Hot coolant
To prevent burns from hot water or steam spurting out when
checking or draining the coolant, wait for the water to cool to a
temperature where it is possible to touch the radiator cap by
hand before starting the operation. Even when the coolant has
cooled down, loosen the cap slowly to relieve the pressure
inside the radiator before removing the cap.
Hot oil
To prevent burns from hot oil spurting out when checking or
draining the oil, wait for the oil to cool to at temperature where
it is possible to touch the cap or plug by hand before starting the
operation. Even when the oil has cooled down, loosen the cap
or plug slowly to relieve the internal pressure before removing
the cap or plug.
FIRE PREVENTION
Fire caused by fuel or oil
Fuel, oil, antifreeze, and window washer liquid are particularly
flammable and can be hazardous. To prevent fire, always
observe the following:
Do not smoke or use any flame near fuel or oil.
Stop the engine before refueling.
Do not leave the machine while adding fuel or oil.
Tighten all fuel and oil caps securely.
Do not spill fuel on overheated surfaces or on parts of the
electrical system.
Use well-ventilated areas for adding or storing oil and fuel.
Keep oil and fuel in the determined place and do not allow
unauthorized persons to enter.
After adding fuel or oil, wipe up any spilled fuel or oil.
When carrying out grinding or welding work on the chassis,
move any flammable materials to a safe place before
starting.
When washing parts with oil, use a non-flammable oil. Diesel
oil and gasoline may catch fire, so do not use them.
Put greasy rags and other flammable materials into a safe
container to maintain safety at the work place.
Do not weld or use a cutting torch to cut any pipes or tubes
that contain flammable liquids.
Fire caused by accumulation of flammable material.

Remove any dry leaves, chips, pieces of paper, dust, or any other flammable materials accumulated or affixed
around the engine, exhaust manifold, muffler, or battery, or inside the undercovers.
2 - 12
.
Fire coming from electric wiring

Short circuits in the electrical system can cause fire.
Always keep electric wiring connections clean and securely tightened.
Check the wiring every day for looseness or damage. Tighten any loose connectors or wiring clamps. Repair
or replace any damaged wiring.
Fire coming from hydraulic line

Check that all the hose and tube clamps, guards, and cushions are securely fixed in position.
If they are loose, they may vibrate during operation and rub against other parts. This may lead to damage to the
hoses, and cause high-pressure oil to spurt out, leading to fire damage or serious injury.
Explosion caused by lighting equipment

When checking fuel, oil, battery electrolyte, window washer fluid, or coolant, always use lighting with
anti-explosion specifications. If such lighting equipment is not used, there is danger of explosion that may
cause serious injury.
When taking the electrical power for the lighting from the machine itself, follow the instructions in this manual.
ACTION IF FIRE OCCURS

If a fire occurs, escape from the machine as follows.
Turn the start switch OFF to stop the engine.
Use the handrails and steps to get off the machine.
WINDOW WASHER LIQUID

Use an ethyl alcohol base washer liquid.
Methyl alcohol base washer liquid may irritate your eyes, so do not use it.
PRECAUTIONS WHEN USING ROPS (Roll Over Protective Structure)

Install ROPS when working in places where there is danger of
falling rocks, such as in mines and quarries, or in places where
there is danger of rolling over.
If ROPS is installed, do not remove it when operating the
machine.
ROPS is installed to protect the operator when machine rolls
over. When machine rolls over, ROPS supports its weight and
absorbs its impact energy.
If ROPS is modified, its strength may lower. When modifying it,
consult your Komatsu distributor.
If ROPS is deformed by falling objects or by rolling over, its strength lowers and its design functions cannot be
maintained. In this case, be sure to ask your Komatsu distributor about repair method.
Even when the ROPS is installed, if you do not fasten your seat belt securely, it cannot protect you properly. Always
fasten your seat belt when operating the machine.
2 - 13
.
PRECAUTIONS FOR ATTACHMENTS

When installing optional parts or attachments, there may be problems with safety or legal restrictions. Therefore
contact your Komatsu distributor for advice.
Any injuries, accidents, or product failures resulting from the use of unauthorized attachments or parts will not be
the responsibility of Komatsu.
When installing and using optional attachments, read the instruction manual for the attachment, and the general
information related to attachments in this manual.
CAB WINDOW GLASSES

If the cab glass on the work equipment side is broken, there is a hazard that the work equipment may contact the
operator's body directly. Stop operation immediately and replace the glass.
UNAUTHORIZED MODIFICATION
Any modification made without authorization from Komatsu can create hazards. Before making a modification,
consult your Komatsu distributor.
Komatsu will not be responsible for any injuries, accidents, product failures or other property damages resulting
from modifications made without authorization from Komatsu.
SAFETY AT WORKSITE
Before starting operations, thoroughly check the area for any unusual conditions that could be dangerous.
When carrying out operations near combustible materials such as thatched roofs, dry leaves or dry grass, there
is a hazard of fire, so be careful when operating.
Check the terrain and condition of the ground at the worksite, and determine the safest method of operation. Do
not carry out operations at places where there is a hazard of landslides or falling rocks.
If water lines, gas lines, or high-voltage electrical lines may be
buried under the worksite, contact each utility and identify their
locations. Be careful not to sever or damage any of these lines.
Take necessary measures to prevent any unauthorized person
from entering the operating area.
In particular, if you need to operate on a road, protect pedestrian
and cars by designating a person for worksite traffic duty or by
installing fences around the worksite.
When traveling or operating in shallow water or on soft ground,
check the shape and condition of the bedrock, and the depth
and speed of flow of the water before starting operations.
WORKING ON LOOSE GROUND

Avoid traveling or operating your machine too close to the edge of cliffs, overhangs, and deep ditches. The
ground may be weak in such areas. If the ground should collapse under the weight or vibration of the machine,
there is a hazard that the machine may fall or tip over. Remember that the soil after heavy rain or blasting or after
earthquakes is weak in these areas.
When working on embankments or near excavated ditches, there is a hazard that the weight and vibration of the
machine will cause the soil to collapse. Before starting operations, take steps to ensure that the ground is safe
and to prevent the machine from rolling over or falling.
2 - 14
.
DO NOT GO CLOSE TO HIGH-VOLTAGE CABLES

Do not travel or operate the machine near electric cables. There is a hazard of electric shock, which may cause
serious injury or property damage. On jobsites where the machine may go close to electric cables, always do as
follows.
Before starting work near electric cables, inform the local power company of the work to be performed, and ask
them to take the necessary action.
Even going close to high-voltage cables can cause electric
shock, which may cause serious burns or even death. Always
Voltage of Cables Safety Distance
maintain a safe distance (see the table on the right) between the 100 V - 200 V Over 2 m (7 ft)
machine and the electric cable. Check with the local power 6,600 V Over 2 m (7 ft)
company about safe operating procedure before starting 22,000 V Over 3 m (10 ft)
operations. 66,000 V Over 4 m (14 ft)
To prepare for any possible emergencies, wear rubber shoes 154,000 V Over 5 m (17 ft)
and gloves. Lay a rubber sheet on top of the seat, and be careful
187,000 V Over 6 m (20 ft)
not to touch the chassis with any exposed part of your body.
275,000 V Over 7 m (23 ft)
Use a signalman to give warning if the machine approaches too
close to the electric cables. 500,000 V Over 11 m (36 ft)
When carrying out operations near high voltage cables, do not
let anyone come close to the machine.
If the machine should come too close or touch the electric cable,
to prevent electric shock, the operator should not leave the
operator's compartment until it has been confirmed that the
electricity has been shut off.
Also, do not let anyone come close to the machine.
ENSURE GOOD VISIBILITY

Check for any persons or obstacles in the area around the machine and check the conditions of the jobsite to
ensure that operations and travel can be carried out safely. Always do as follows.
Position a signalman if there are areas at the rear of the machine where the visibility is not good.
When working in dark places, turn on the working lamp and front lamps installed to the machine, and set up
additional lighting in the work area if necessary.
Stop operations if the visibility is poor, such as in mist, snow, rain, or dust.
VENTILATION FOR ENCLOSED AREAS

Exhaust fumes from the engine can kill.
If it is necessary to start the engine within an enclosed area, or
when handling fuel, flushing oil, or paint, open the doors and
windows to ensure that adequate ventilation is provided to
prevent gas poisoning.
2 - 15
.
CHECKING SIGNALMAN'S SIGNALS AND SIGNS

Set up signs to inform of road shoulders and soft ground. If the visibility is not good, position a signalman if
necessary. Operators should pay careful attention to the signs and follow the instructions from the signalman.
Only one signalman should give signals.
Make sure that all workers understand the meaning of all signals and signs before starting work.
BE CAREFUL ABOUT ASBESTOS DUST

Asbestos dust in the air can cause lung cancer if it is inhaled. There
is danger of inhaling asbestos when working on jobsites handling
demolition work or work handling industrial waste. Always observe
the following.
Spray water to keep down the dust when cleaning. Do not use
compressed air for cleaning.
If there is danger that there may be asbestos dust in the air,
always operate the machine from an upwind position. All
workers should use an approved respirator.
Do not allow other persons to approach during the operation.
Always observe the rules and regulations for the work site and
environmental standards.
This machine does not use asbestos, but there is a danger that
imitation parts may contain asbestos, so always use genuine
Komatsu parts.
2 - 16
.
SAFETY PRECAUTIONS FOR OPERATION
PRECAUTIONS FOR OPERATION

BEFORE STARTING ENGINE
If there is a warning tag hanging from the work equipment control
lever, do not start the engine or touch the levers .
CHECKS BEFORE STARTING ENGINE

Carry out the following checks before starting the engine at the beginning of the day's work.
Completely remove all flammable materials accumulated around the engine and battery, and remove any dirt
from the windows, mirrors, handrails and steps.
Remove all dirt from the surface of the lens of the front lamps and working lamps, and check that they light up
correctly.
Check the coolant level, fuel level, and oil level in engine oil pan, check for clogging of the air cleaner, and check
for damage to the electric wiring.
Adjust the operator's seat to a position where it is easy to carry out operations, and check that there is no damage
or wear to the seat belt or mounting clamps.
Check that the gauges work properly, check the angle of the lights and working lamps, and check that the control
levers are all at the neutral position.
When starting the engine, check that the parking lever and work equipment lock lever are at the LOCK position.
Adjust the mirrors so that you can get a good rear-view from the operator's seat.
For the details of adjustment, see "ADJUST MIRROR (PAGE 3-82)".
Check that there are no persons or obstacles above, below, or in the area around the machine.
PRECAUTIONS WHEN STARTING

When starting the engine, sound the horn as a warning.
Start and operate the machine only while seated.
Do not allow anyone apart from the operator to ride on the machine.
Do not short circuit the starting motor circuit to start the engine. Short circuit can cause fire.
2 - 17
.
PRECAUTIONS FOR OPERATION SAFETY
PRECAUTIONS IN COLD AREAS

Carry out the warming-up operation thoroughly. If the machine is not thoroughly warmed up before the control
levers are operated, the reaction of the machine will be slow, and this may lead to unexpected accidents.
If the battery electrolyte is frozen, do not charge the battery or start the engine with a different power source.
There is a hazard that this will ignite the battery and cause the battery to explode.
Before charging or starting the engine with a different power source, melt the battery electrolyte and check that
there is no leakage of electrolyte before starting.
2 - 18
.
OPERATION
CHECKS BEFORE OPERATION

When carrying out the checks, move the machine to a wide area where there are no obstructions, and operate
slowly. Do not allow anyone near the machine.
Always fasten your seat belt.
Check the operation of travel, steering and brake systems, and
work equipment control system.
Check for any abnormality in the sound of the machine,
vibration, heat, smell, or gauges; check also that there is no
leakage of oil or fuel.
If any abnormality is found, carry out repairs immediately.
PRECAUTIONS FOR MOVING MACHINE FORWARD OR IN REVERSE

Before travelling, check again that there is no one in the
surrounding area, and that there are no obstacles.
Before travelling, sound the horn to warn people in the area.
Always operate the machine only when seated.
Do not allow anyone apart from the operator to ride on the
machine.
Check that the back-up alarm (alarm buzzer when machine
travels in reverse) works properly.
Always lock the door and windows of the operator's
compartment in position (open or closed).
On jobsites where there is a hazard of flying objects or of objects
entering the operator's compartment, check that the door and
windows are securely closed.
If there is an area to the rear of the machine where the visibility
is obstructed, use a flagman. Be extremely careful not to hit
anything and drive the machine slowly.
Always be sure to carry out the above precautions even when the machine is equipped with mirrors.
2 - 19
.
PRECAUTIONS WHEN TRAVELING

Never turn the starting switch to the OFF position when traveling. It is dangerous if the engine stops when the
machine is traveling. When the engine is off, it is impossible to operate the steering. Apply the brakes and stop
the machine immediately, if the engine stops.
When traveling on flat ground, keep the work equipment 40 to 50 cm (16 to 20 in) high above the ground.
When traveling on rough ground, travel at low speed and do not
operate the steering suddenly. There is danger that the machine
may turn over. The work equipment may hit the ground surface
and cause the machine to lose its balance, or may damage the
machine or structures in the area.
Avoid traveling over obstacles when possible. If the machine

has to travel over an obstacle, keep the work equipment close
to the ground and travel at low speed. Never travel over
obstacles which make the machine tilt strongly to one side.
When traveling or carrying out operations, always keep a safe
distance from people, structures, or other machines to avoid
coming into contact with them.
When passing over bridges or structures, check first that the
structure is strong enough to support the weight of the machine.
When traveling on public roads, check first with the relevant
authorities and follow their instructions.
When operating in tunnels, under bridges, under electric wires,
or other places where the height is limited, operate slowly and
be extremely careful not to let the work equipment hit anything.
Do not approach the edge of a cliff carelessly. When dropping soil over a cliff for banking or reclamation, leave
soil of one scoop at the edge of the cliff and push it with the next scoop.
When the machine passes over the top of a hill or when a load is dumped over a cliff, the load is suddenly reduced,
and there is danger that the travel speed rises suddenly. To prevent this, lower the travel speed.
If the machine moves with only either side of the blade loaded, its tail may swing. Take care.
2 - 20
.
TRAVELING ON SLOPES
To prevent the machine from tipping over or slipping to the side, always do as follows.
When traveling on slops, keep the blade approxmately 20 to 30
cm (8 to 12 in) above the ground. In case of emergency, quickly
lower the blade to the ground to help the machine to stop. Apply
the brake and use the engine as a brake, if necessary.
Always travel straight up or down a slope. Traveling at an angle
or across the slope is extremely dangerous.
Do not turn on slopes or travel across slopes. Always go down
to a flat place to change the position of the machine, then travel
on to the slope again.
Travel on grass, fallen leaves, or wet steel plates with low
speed. Even with slight slopes there is a hazard that the
machine may slip.
When driving down a slope, never shift gear or place the transmission in neutral. The engine brake cannot be
used and this creates a dangerous condition. Always travel downhill in the same speed range as when traveling
uphill.
When turning on a downhill ground, lower the travel speed.
PROHIBITED OPERATIONS
To make it easier to escape if there is any problem, set the tracks at right angles to the road shoulder or cliff with
the sprocket at the rear when carrying out operations.
When operating the machine, take care that it will not exceed its performance values such as stability, maximum
using load, etc. to prevent rolling of the machine caused by an overload and disasters caused by breakage of the
work equipment.
USING BRAKES
When the machine is traveling, do not rest your foot on the brake pedal. If you travel with your foot resting on the
pedal, the brake will always be applied, and this will cause the brakes to overheat and fail.
Do not depress the brake pedal repeatedly if not necessary. If this is neglected, the brake will be overheated and
will not work when required.
When traveling downhill, use the braking force of the engine.
OPERATE CAREFULLY ON SNOW

Snow-covered or frozen surfaces are slippery, so be extremely careful when traveling or operating the machine,
and do not operate the levers suddenly. Even a slight slope may cause the machine to slip, so be particularly
careful when working on slopes.
With frozen ground surfaces, the ground becomes soft when the temperature rises, and this may cause the
machine to tip over.
If the machine enters deep snow, there is a hazard that it may tip over or become buried in the snow. Be careful
not to leave the road shoulder or to get trapped in a snow drift.
When clearing snow, the road shoulder and objects placed beside the road are buried in the snow and cannot be
seen. There is a hazard of the machine tipping over or hitting covered objects, so always carry out operations
carefully.
When traveling on snow-covered slopes, never apply the brakes suddenly. Reduce the speed and use the engine
as a brake while appling the foot brake intermittently (depress the brake intermittently several times). If
necessary, lower the blade to the ground to stop the machine.
2 - 21
.
PARKING MACHINE
Park the machine on level ground where there is no danger of
falling rocks or landslides, or of flooding if the land is low, and
lower the work equipment to the ground.
If it is necessary to park the machine on a slope, set the blocks
under the tracks to prevent the machine from moving, then dig
the work equipment into the ground.
When leaving the machine, set the work equipment lock lever
and parking lever to the LOCK position, stop the engine, and use
the key to lock all the equipment. Always remove the key and
take it with you.
Work equipment posture: See "PARKING MACHINE (PAGE
3-107)".
Locks: See "LOCKING (PAGE 3-109)"
Always close the door of the operator's compartment.
2 - 22
.
TRANSPORTATION
The machine can be divided into parts for transportation, so when transportating the machine, please contact your
Komatsu distributor to have the work carried out.
SHIPPING
When shipping the machine on a trailer, do as follows.
The weight, transportation height, and overall length of the machine differ according to the work equipment, so
be sure to confirm the dimensions.
When passing over bridges or structures on private land, check first that the structure is strong enough to support
the weight of the machine. When traveling on public roads, check first with the relevant authorities and follow their
instructions.
For details of the shipping procedure, see "TRANSPORTATION (PAGE 3-129)" in the OPERATION section.
2 - 23
.
BATTERY
BATTERY HAZARD PREVENTION

Battery electrolyte contains sulphuric acid, and batteries generate flammable hydrogen gas, which may explode.
Mistaken handling can lead to serious injury or fire. For this reason, always observe the following precautions.
When the battery electrolyte is below LOWER LEVEL, don't either use or charge the battery. Otherwise, that may
cause explosion. Always carry out periodic checks of the battery electrolyte, and add distilled water up to UPPER
LEVEL.
For the method of checking the battery electrolyte, see "CHECK LEVEL OF BATTERY ELECTROLYTE (PAGE
4-47)".
When working with batteries, always wear safety glasses and rubber gloves.
Never smoke or use any flame near the battery.
If you spill acid on your clothes or skin, immediately flush the

area with large amount of water.
If acid gets into your eyes, flush them immediately with large
amount of water and seek medical attention.
Before working with batteries, turn the starting switch to the OFF position.
As there is a hazard that sparks will be generated, always do as follows.

Do not let tools or other metal objects make any contact between the battery terminals. Do not leave tools or other
metal objects lying around near the battery.
Always disconnect the negative (-) terminal (ground side) first when removing the battery; when installing the
battery, connect the positive (+) terminal first, and connect the ground last. Tighten the battery terminals securely.
Tighten the battery terminals securely.
Flammable hydrogen gas is generated when the battery is charged, so remove the battery from the chassis, take
it to a well-ventilated place, and remove the battery caps before charging it.
Tighten the battery caps securely.
Install the battery securely to the determined place.
2 - 24
.
STARTING WITH BOOSTER CABLE

If any mistake is made in the method of connecting the booster
cables, it may cause the battery to explode, so always do as
follows.
When starting with a booster cable, carry out the starting
operation with two workers (one worker sitting in the operator's
seat and the other working with the battery).
When starting from another machine, do not allow the two
machines to touch.
When connecting the booster cables, turn the starting switch
OFF for both the normal machine and problem machine. There
is a hazard that the machine will move when the power is
connected.
Be sure to connect the positive (+) cable first when installing the
booster cables. Disconnect the negative (-) cable (ground side)
first when removing them.
When removing the booster cables, be careful not to let the
booster cable clips touch each other or to let the clips touch the
machine.
Always wear safety goggles and rubber gloves when starting
the engine with booster cables.
When connecting a normal machine to a problem machine with
booster cables, always use a normal machine with the same
battery voltage as the problem machine.
For the procedure of starting the engine with booster cables, see
"STARTING ENGINE WITH BOOSTER CABLE (PAGE
3-138)".
2 - 25
.
TOWING
WHEN TOWING
Injury or death could result if a disabled machine is towed
incorrectly. Always observe the following rules.
Never use a towing method different from the one described in
this manual.
For the method of towing, see "METHOD OF TOWING
MACHINE (PAGE 3-137)".
When handling a wire rope, always wear leather gloves.
When working with others to prepare for towing, signals should
be agreed upon beforehand.
If your machine is towed by another machine, stop the engine
and release the brake. Please contact your Komatsu distributor
to have the brake released.
If this machine cannot travel under its own power, release the
brakes, then tow the machine with another machine. Please
contact your Komatsu distributor to have the brakes released.
Towing on slopes is dangerous. When doing so, choose a
gentle slope. If no gentle slope is available, make such a slope
by earth-removal work.
When connecting up a towing machine, do not let anyone enter
the area between the towing machine and the equipment being
towed.
Do not straddle the towing cable or wire rope.
When your machine is towed by another machine, ALWAYS
use a wire rope with a sufficient towing capacity.
Set the towing machine and the towing connection of the
equipment being towed in a straight line when connecting it.
Take up the slack in the wire rope and tow the machine.
When lifting the machine up, use the towing hook.
If the machine is stuck in sandy soil, dig out the soil around the
towing hook, then use the towing hook to pull the machine out.
Permissible load for towing hook: 37,500 kg (367,750 N).
Do not use a broken (A), kinked (B) or frayed (C) wire rope.
2 - 26
.
SAFETY PRECAUTIONS FOR MAINTENANCE
PRECAUTIONS FOR MAINTENANCE

WARNING TAG
Always attach the "DO NOT OPERATE" warning tag to the work
equipment control lever in the operator's cab to alert others that
you are performing service or maintenance on the machine.
Attach additional warning tags around the machine if necessary.
Warning tag Part No. 09963-03001
Keep the tag in the operation manual pocket.
If others start the engine, or touch or operate the work
equipment control lever while you are performing service or
maintenance, you could suffer serious injury or property
damage.
KEEP WORK PLACE CLEAN AND TIDY

Do not leave hammers or other tools lying around in the work place. Wipe up all grease, oil, or other substances
that will cause you to slip. Always keep the work place clean and tidy to enable you to carry out operations safely.
If the work place is not kept claen and tidy, there is the danger that you will trip, slip, or fall over and injure yourself.
APPOINT LEADER WHEN WORKING WITH OTHERS

When repairing the machine or when removing and installing the work equipment, appoint a leader and follow his
instructions during the operation.
2 - 27
.
PRECAUTIONS FOR MAINTENANCE SAFETY
STOP ENGINE BEFORE CARRYING OUT INSPECTION AND MAINTENANCE

Stop the machine on firm, level ground.
Select a place where there is no hazard of falling rocks or
landslides, or of flooding if the land is low.
Lower the work equipment completely to the ground and stop
the engine.
After stopping the engine, operate the work equipment control
lever to the RAISE and LOWER positions 2 or 3 times to release
the pressure remaining in the hydraulic circuit, then set the work
equipment lock lever and Parking lever to LOCK position.
Put blocks under the track to prevent the machine from moving.
2 - 28
.
TWO WORKERS FOR MAINTENANCE WHEN ENGINE IS RUNNING

To prevent injury, do not carry out maintenance with the engine
running. If maintenance must be carried out with the engine
running, carry out the operation with at least two workers and do as
follows.
One worker must always sit in the operator's seat and be ready
to stop the engine at any time. All workers must maintain
contact with the other workers.
Place the parking lever and work equipment lock lever at the
LOCK position to prevent the work equipment from moving.
When carrying out operations near the fan, fan belt, or other
rotating parts, there is a hazard of being caught in the parts, so
be careful not to come close.
Do not touch any control levers. If any control lever must be
operated, give a signal to the other workers to warn them to
move to a safe place.
Never drop or insert tools or other objects into the fan or fan belt.
Parts may break or be sent flying.
PROPER TOOLS
Use only tools suited to the task and be sure to use the tools
correctly. Using damaged, low quality, faulty, makeshift tools or
improper use of the tools could cause serious personal injury.
2 - 29
.
HANDLING ACCUMULATOR
On machines equipped with an accumulator, for a short time after the engine is stopped, if the blade control lever
is moved to the LOWER position, the work equipment will move down under its own weight.
After stopping the engine, always place the work equipment lock lever and parking lever in the LOCK position.
When releasing the pressure inside the work equipment circuit on machines equipped with an accumulator, follow
the procedure given in the following section.
Method of releasing pressure : See "ACCUMULATOR, HANDLING (PAGE 3-67)".
The accumulator is charged with high-pressure nitrogen gas.
When handling the accumulator, careless procedure may cause
an explosion which could lead to serious injury or property
damage. For this reason, always observe the following
precautions.
Do not disassemble the accumulator.
Do not bring it near flame or dispose of it in fire.
Do not make holes in it, weld it, or use a cutting torch.
Do not hit or roll the accumulator, or subject it to any impact.
When disposing of the accumulator, the gas must be released.
Please contact your Komatsu distributor to have this work
performed.
PERSONNEL
Only authorized personnel can service and repair the machine. Do not allow unauthorized personnel into the area.
If necessary, employ an observer.
ATTACHMENTS
Appoint a leader before starting removal or installation
operations for attachments.
Place attachments that have been removed from the machine in
a stable condition so that they do not fall. And take steps to
prevent unauthorized persons from entering the storage area.
2 - 30
.
WORK UNDER THE MACHINE

If it is necessary to go under the work equipment or the machine
to carry out service and maintenance, support the work
equipment and machine securely with blocks and stands strong
enough to support the weight of the work equipment and
machine.
It is extremely dangerous to work under the machine if the track
shoes are lifted off the ground and the machine is supported
only with the work equipment. If any of the control levers is
touched by accident, or there is damage occurring to the
hydraulic piping, the work equipment or the machine will
suddenly drop. This is extremely dangerous. Never work under
the work equipment or the machine.
NOISE
When carrying out maintenance of the engine and you are exposed to noise for long periods of time, wear ear covers
or ear plugs while working.
If the noise from the machine is too loud, it may cause temporary or permanent hearing problems.
PRECAUTIONS WHEN USING HAMMER

When using a hammer, pins may fly out or metal particles may be
scattered. This may lead to serious injury. Always do as follows.
If hard metal parts such as pins, bucket teeth, cutting edges, or
bearings are hit with a hammer, there is a hazard that pieces
might be scattered and cause injury. Always wear safety
goggles and gloves.
When hitting pins or bucket teeth, there is a hazard that broken
pieces might be sent flying and injure people in the surrounding
area. Always check that there is no one in the surrounding area.
There is a hazard that the pin hit with strong force may fly out and injure people in the surrounding area.
REPAIR WELDING
Welding operations must always be carried out by a qualified welder and in a place equipped with proper equipment.
There is a hazard of gas, fire, or electrocution when carrying out welding, so never allow any unqualified personnel
to carry out welding.
REMOVING BATTERY TERMINAL

When repairing the electrical system or when carrying out electrical welding, remove the negative (-) terminal of the
battery to prevent the flow of current.
2 - 31
.
PRECAUTIONS WHEN USING HIGH-PRESSURE GREASE TO ADJUST TRACK TENSION

Grease is pumped into the track tension adjustment system
under high pressure. If the specified procedure for maintenance
is not followed when making adjustment, grease drain valve (1)
may fly out and cause serious injury or damage.
When loosening grease drain valve (1) to loosen track tension,
never loosen it more than one turn. In doing so, loosen the valve
slowly.
Never put your face, hands, feet, or any other part of your body
directly in front of grease drain valve (1).
DO NOT DISASSEMBLE RECOIL SPRING

Never attempt to disassemble the recoils spring assembly. It contains a spring under high pressure which serves
as a shock absorber for the idler. If it is disassembled by mistake, the spring will fly out and cause serious injury.
When it becomes necessary to disassemble it, ask your Komatsu distributor to do the work.
2 - 32
.
PRECAUTION WITH HIGH-PRESSURE OIL

The hydraulic system is always under internal pressure. When inspecting or replacing piping or hoses, always
check that the pressure in the hydraulic circuit has been released. If the circuit is still under pressure, it will lead to
serious injury, so always do as follows.
Do not carry out inspection or replacement work when the hydraulic system is under pressure.
If there is any leakage from the piping or hoses, the surrounding area will be wet, so check for cracks in the piping
and hoses and for swelling in the hoses.
When carry out inspection, wear safety glasses and leather gloves.
There is a hazard that high-pressure oil leaking from small holes
may penetrate your skin or cause blindness if it contacts your
eyes directly. If you are hit by a jet of high-pressure oil and suffer
injury to your skin or eyes, wash the place with clean water, and
consult a doctor immediately for medical attention.
PRECAUTION FOR HIGH FUEL PRESSURE

When the engine is running, high-pressure is generated in the engine fuel piping. When carrying out inspection or
maintenance of the fuel piping system, stop the engine and wait for at least 30 seconds to allow the internal pressure
to go down before starting the operation.
HANDLING HIGH-PRESSURE HOSES

If oil or fuel leaks from high-pressure hoses, it may cause fire or defective operation, which may lead to serious
injury. If any loose bolts are found, stop work and tighten to the specified torque. If any damaged hoses are found,
stop operations immediately and contact your Komatsu distributor.
Replace the hose if any of the following problems are found.
Damaged or leaking hydraulic fitting.
Frayed or cut covering or exposed reinforcement wire layer.
Covering swollen in places.
Twisted or crushed movable portion.
Foreign material embedded in covering.
PRECAUTION FOR HIGH VOLTAGE

When the engine is running and immediately after it is stopped, high voltage is generated inside the engine
controller and the engine injector, and there is danger of electrocution. Never touch the inside of the controller
or the engine injector portion.
If it is necessary to touch the inside of the controller or the engine injector portion, please contact your Komatsu
distributor.
2 - 33
.
WASTE MATERIAL
To prevent pollution, pay careful attention to the method of disposing of waste materials.
Always put oil drained from your machine in containers. Never
drain oil directly onto the ground or dump into the sewage
system, rivers, the sea, or lakes.
Obey appropriate laws and regulations when disposing of
harmful objects such as oil, fuel, coolant, solvent, filters, and
batteries.
MAINTENANCE FOR AIR CONDITIONER

If air conditioner refrigerant gets into your eyes, it may cause blindness; if it touches your skin, it may cause frostbite.
Never touch refrigerant.
COMPRESSED AIR
When carrying out cleaning with compressed air, there is a hazard of serious injury caused by flying particles.
When using compressed air to clean elements or the radiator, always wear safety goggles, dust mask, gloves,
and other protective equipment.
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS

To enable the machine to be used safely for long periods, be particularly careful to periodically replace the
seatbelt, hoses, and other parts which have a close relationship to safety.
See Replacing critical parts: PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS (PAGE 4-14)
The material of these components naturally changes over time, and repeated use causes deterioration, wear, and
fatigue. As a result, there is a hazard that these components may fail and cause serious injury or death. It is
difficult to judge the remaining life of these components from external inspection or the feeling when operating,
so always replace them at the specified interval.
Replace or repair safety-critical parts if any defect is found, even when they have not reached the time specified
interval.
2 - 34
.
3-1
.
GENERAL VIEW OPERATION
GENERAL VIEW
GENERAL VIEW OF MACHINE
(1) Blade (6) Sprocket

(2) Blade lift cylinder (7) Track frame
(3) Cab (8) Frame
(4) ROPS (9) Track shoe
(5) Ripper
3-2
.
OPERATION GENERAL VIEW
GENERAL VIEW OF CONTROLS AND GAUGES
(1) Parking lever (12) Pivot turn switch

(2) Work equipment lock lever (13) Starting switch
(3) Cigarette lighter (14) Information switch
(4) Fuel control dial (15) Buzzer cancel switch
(5) Joystick (Steering, directional and gear shift lever) (16) Brake pedal
(6) Additional heater switch (if equipped) (17) Deceleration pedal
(7) Front lamp, working lamp switch (18) Blade control lever
(8) Rear lamp switch (19) Horn switch
(9) Air conditioner panel or heater panel (20) Ripper control lever
(10) Disply panel A (21) Pin puller control switch (if equipped)
(Speed range display, Engine speed) (22) Wiper switch
(11) Auto shift down switch (23) Room lamp switch
3-3
.
GENERAL VIEW OPERATION
FRONT PANEL
(1) Engine coolant temperature gauge (12) Engine pre-heating pilot lamp
(2) Power train oil temperature gauge (13) Maintenance caution lamp
(3) Hydraulic oil temperature gauge (14) Warning lamp
(4) Fuel level gauge (15) Filter/oil change interval lamp
(5) Radiator coolant level caution lamp (16) Display panel A (Speed range, Engine speed)
(6) Charge level caution lamp (17) Display panel B (Multi-information)
(7) Engine oil pressure caution lamp (18) Dual/single tilt selector display lamp
(8) Engine coolant temperature caution lamp (19) Lock up mode switch
(9) Power train oil temperature caution lamp (20) Economy mode switch
(10) Hydraulic oil temperature caution lamp (21) Reverse slow mode selector switch
(11) HSS charge pressure caution lamp
3-4
.
OPERATION EXPLANATION OF COMPONENTS
EXPLANATION OF COMPONENTS
The following is an explanation of devices needed for operating the machine.
To perform suitable operations correctly and safely, it is important to completely understand methods of operating
the equipment, and the meanings of the displays.
FRONT PANEL
A: Check monitor group E: Mode selection switch group

B: Caution monitor group F: Switches
C: Emergency caution items G: Lamps
D: Meter group
3-5
.
EXPLANATION OF COMPONENTS OPERATION
A: Check monitor group (see "CHECK MONITOR GROUP (PAGE 3-7)")

Before the engine is started, the basic items among the check before starting items that must be checked are
displayed.
If there is any abnormality, the caution lamp for the location of the abnormality flashes.
NOTICE
When performing the check before starting, do not rely only on these monitors. Always perform the inspection items according
to the maintenance section or Section "OPERATION (PAGE 3-68)".
B: Caution monitor group (See "CAUTION MONITOR GROUP (PAGE 3-9)")
CAUTION
If the caution lamp for any of these items flashes, check and repair the appropriate item as soon as possible.
These are items, which need to be observed while the engine is running. If any abnormality occurs, items, which
need to be repaired as soon as possible, are displayed.
If there is any abnormality, the appropriate monitor lamp will flash to indicate the location of the abnormality.
C: Emergency caution items (see "EMERGENCY CAUTION ITEMS (PAGE 3-11)")
CAUTION
If the caution lamp for any of these items flashes, stop the engine immediately or run it at low idling, and take the following action.
This displays the abnormal items that action must immediately be taken when the engine is running.
If there is any abnormality, the monitor showing the location of the abnormality will flash and the alarm buzzer will
sound.
D Meter display portion (see METER GROUP (PAGE 3-14))

This consists of the preheating pilot lamp, power train oil temperature gauge, engine water temperature gauge,
hydraulic oil temperature gauge. fuel gauge, dual/single selector display lamp, torque converter lock-up display
lamp, display panel A (speed range display, engine speed) and display panel B (multi-information).
E. Mode selection switch group (see "MODE SELECTION SWITCH GROUP (PAGE 3-18)")
This consists of the lock-up mode switch, economy mode selector switch, shoe slip control switch, rockbed selection
mode selector switch, and slow reverse mode selector switch.
F Switches (for details, see SWITCHES (PAGE 3-34).)

These consist of the starting switch, buzzer cancel switch, front lamp switch, working lamp switch, rear lamp switch,
auto shift down switch, pivot turn switch, information switch, and additional heater switch (option).
G Lamps (for details, see LAMPS (PAGE 3-23).)

These consist of the warning lamp and filter, oil change interval lamp.
3-6
.
CHECK MONITOR GROUP
NOTICE
When performing the check before starting, do not rely only on these monitors. Always refer to "OPERATION (PAGE 3-68)" to
perform these checks.
Park the machine on level ground and then check the monitor lamps.
Confirm that monitor lamps light up about 2 seconds after the starting switch is turned to the ON position. If any monitor lamp
does not light, contact your Komatsu distributor to inspect and repair.
REMARK
When the starting switch is turned to the ON position, before starting the engine, the caution lamps flashes for
2 seconds, the warning lamps light up for 2 seconds, and the alarm buzzer sounds for 2 seconds.
The caution lamps cannot be checked for any malfunction until at least 5 seconds after the engine has been
stopped.
This displays the basic items among the check before starting items that must be checked before starting the
engine. If there is any abnormality, the caution lamp for that location will flash.
A (1) Radiator coolant level caution lamp
3-7
.
RADIATOR COOLANT LEVEL CAUTION LAMP

Lamp (1) warns the operator that the coolant level in the main and
sub radiators has gone down.
If the lamp flashes, check the coolant level in the main and sub
radiators, and add coolant.
3-8
.
CAUTION MONITOR GROUP

CAUTION
If these caution lamps item flash, check and repair the appropriate location as soon as possible.
NOTICE
Park the machine on level ground and check the monitor lamps.
Confirm that monitor lamps light up about 2 seconds after the starting switch is turned to the ON position. If any monitor lamp
does not light, contact your Komatsu distributor to inspect and repair.
These are items which need to be observed when the engine is running. If any problem occurs, the item needing
immediate repair is displayed. If there is any problem, the problem location on the caution lamp will flash.
B(1) Charge level caution lamp B(2) Maintenance caution lamp
CHARGE LEVEL CAUTION LAMP

Lamp (1) indicates an abnormality in the charging system while the
engine is running.
If the monitor lamp flashes, check the V-belt tension. If any
abnormality is found, see "OTHER TROUBLE (PAGE 3-141)".
REMARK
This monitor lamp lights when the starting switch is turned to ON
immediately after the engine is started or immediately before the
engine is stopped. It does not indicate an problem.
3-9
.
MAINTENANCE CAUTION LAMP

Monitor (2) flashes when the filter or oil change interval has been
reached. DISPLAY PANEL B (Multi-information) (PAGE 3-17) to
the maintenance mode and check or replace the applicable filter or
oil.
3 - 10
.
EMERGENCY CAUTION ITEMS

CAUTION
If the caution lamp for any of these items flashes, stop the engine immediately or run it at low idling, and take the following action.
NOTICE
Park the machine on level ground and check the monitor lamps.
Confirm that these caution lamps light for about 2 seconds after the starting switch is turned to ON. If any monitor lamp does
not light, have your Komatsu distributor inspect and repair it.
These items need to be observed while the engine is running. If any abnormality occurs, items that need to be
repaired immediately are displayed.
If there is any abnormality, alarm buzzer sounds intermittently and the abnormal location on the caution lamp will
flash.
C (1) Engine oil pressure caution lamp C (4) Hydraulic oil temperature caution lamp
C (2) Engine coolant temperature caution lamp C (5) HSS charge pressure caution lamp
C (3) Power train oil temperature caution lamp
3 - 11
.
ENGINE OIL PRESSURE CAUTION LAMP

This lamp (1) indicates a low engine oil pressure.
If the monitor lamp flashes, stop the engine and check it
immediately.
REMARK
The alarm buzzer sounds, when the starting switch is turned to ON
immediately after the engine oil has been changed. It does not
indicate an problem.
ENGINE COOLANT TEMPERATURE CAUTION LAMP

This lamp (2) indicates a raise in the coolant temperature.
When the monitor lamp flashes, run the engine at low idling speed
until green range of the engine coolant temperature gauge lights.
POWER TRAIN OIL TEMPERATURE CAUTION LAMP

Lamp (3) warns operator that the torque converter outlet port oil
temperature has risen.
If it flashes, run the engine at low idling until the power train oil
temperature gauge goes down to the green range.
HYDRAULIC OIL TEMPERATURE CAUTION LAMP

Lamp (4) indicates a rise in the hydraulic oil temperature.
When the monitor lamp flashes, stop the machine and run the
engine at the low idling speed until oil temperature falls.
3 - 12
.
HSS CHARGE PRESSURE CAUTION LAMP

This monitor (5) warns the operator that the HSS charge pressure
has dropped. If it flashes, stop the engine and check.
REMARK
The buzzer may also sound, but this is not an abnormality.
3 - 13
.
METER GROUP
NOTICE
While the engine is at rest, turn the starting switch to the ON position to see if the engine coolant temperature gauge, power train
oil temperature gauge, fuel level gauge, and monitor lamps all light up.
If they do not, have your Komatsu distributor inspect and repair it.
D (1) Engine coolant temperature gauge D(7) Dual/single tilt selector display lamp
D (2) Power train oil temperature gauge (Dual tilt dozer specification)
D (3) Hydraulic oil temperature gauge D(8) Display panel A
D (4) Fuel level gauge (Speed range display, Engine speed)
D (5) Engine pre-heating pilot lamp D(9) Display panel B (Multi-information)
D (6) Torque converter lock up pilot lamp
ENGINE COOLANT TEMPERATURE GAUGE

Gauge (1) indicates temperature of the engine coolant.
If the temperature is normal during operation, green range (B) will
light.
If red range (C) lights during operation, move the fuel control dial to
lower engine speed tp approx. 3/4 of the full speed, and run until
the coolant temperature enters green range (B).
During operation, if red range (C) lights, engine coolant
temperature monitor flashes and the alarm buzzer sounds, stop
the machine and run at low idle until coolant temperature enters
green range (B).
(A): White range
(B): Green range
(C): Red range
NOTICE
If the coolant temperature gauge often enters red range (C), check the radiator for clogging.
3 - 14
.
POWER TRAIN OIL TEMPERATURE GAUGE

Gauge (2) indicates the torque converter outlet oil temperature.
light.
If red range (C) lights up during operation, move the fuel control dial
to lower engine speed to approx. 3/4 of the full speed, reduce the
load and run until the oil temperature enters green range (B).
If red range (C) lights up, the power train oil temperature caution
lamp flashes and the alarm buzzer sounds during operations, stop
the machine, and run the engine at low idling until the oil
temperature goes down to green range (B).
(A): White range
(B): Green range
(C): Red range
NOTICE
If the power train oil temperature gauge often enters red range (C), shift
down one speed range to reduce the load on the power train when
operating.
HYDRAULIC OIL TEMPERATURE GAUGE

Gauge (3) indicates the hydraulic oil temperature.
light.
If the red range (C) lights up during operation, move the fuel control
lever to lower the engine speed to approx. 3/4 of the full speed,
reduce the load and run until the oil temperature enters the green
range (B).
(A): White range
(B): Green range
(C): Red range
FUEL LEVEL GAUGE

Gauge (4) fuel level in the fuel tank.
During normal operation, the green range (B) should be lighted up.
If red range (A) lights up during operation, add fuel immediately. If
this is not done, the engine speed will become irrgular or an error
display will be shown on the monitor.
(A): Red range
(B): Green range
REMARK
The display is not proportional to the amount of fuel remaining.
If only the red range (A) lights up, there is less than 90 liters
(23.78 US gal) of fuel remaining.
3 - 15
.
ENGINE PRE-HEATING PILOT LAMP

Lamp (5) indicates that engine is being pre-heated bu the electrical
heater during cold weather.
The engine controller detects the coolant temperature and
automatically actuates pre-heating in low temperatures when
starting the engine.
TORQUE CONVERTER LOCK UP PILOT LAMP

Lamp (6) lights up when the torque converter has been
automatically locked up (when transmission is set to direct drive)
after lock up switch for the monitor lamp has been turned ON.
The lamp goes out when torque converter drive is being used.
DUAL/SINGLE TILT SELECTOR DISPLAY LAMP

(Dual tilt dozer specification)
Lamp (7) lights green when the dual/single selector switch on the
work equipment control lever is set to DUAL.
DISPLAY PANEL A (speed range display, engine speed)

Meter (8) displays transmission speed range being used on the
machine and engine speed.
When the transmission is in 1st FORWARD, the display shows
F1, and when it is in 1st REVERSE, the display shows R1.
The peripheral bar graph indicates the engine speed. When the
red range lights up during running, shift the gear to a lower
speed to run the engine at a speed within the green range.
3 - 16
.
DISPLAY PANEL B (Multi-information)

This monitor (9) displays information related to the condition of the machine on the top and bottom lines of the
display portion. The content of the display can be switched by operating the service mode selector switch.
(1) Operating mode (normal operation screen)
Use this mode when operating the machine.
REMARK
When starting switch is turned from the OFF position to the ON
position, the multi-information is set to the operating mode.
The shift mode selected by operation of the "GEARSHIFTING

USING SHIFT MODE SELECTION (PAGE 3-98)" through the shift
mode selection is displayed on the left side of the monitor.
The total operating hours of the machine is displayed at the bottom
right of the monitor. (Use the service meter function display to set
the interval for periodic maintenance.)
When the engine is running, the service meter advances, even if
the machine is not moving.
When the engine is running, the hourglass mark pilot display at the
side of the meter lights up to show that the meter is advancing.
The meter advances by 1 for every hour of operation, regardless of
the engine speed.
If there is a failure in the machine, the failure code is also displayed
on the top line. If a failure code is displayed, carry out the remedy
given in "OTHER TROUBLE (PAGE 3-141)".
(2) Maintenance mode
The maintenance mode is displayed by continuing to turn the

information switch in the direction for 2.5 seconds.
For details, see "METHOD OF USING DISPLAY PANEL B
(Multi-information) (PAGE 3-25)".
3 - 17
.
MODE SELECTION SWITCH GROUP

Press each mode switch to turn it ON or OFF and to select the mode.
For details of setting the mode to use, see "EFFECTIVE USE OF MODE SELECTION SYSTEM (PAGE 3-112)".
It is impossible to use any combination of the lock up mode and any other mode.
The economy mode and reverse slow mode can be used independently or in combination.
E (1) Lock up mode switch E (3) Reverse slow mode selector switch
E (2) Economy mode switch
Selecting mode to match the type of work and quality of rock and soil makes to perform operations effectively.
{: Possible to use : Compound use not possible
3 - 18
.
LOCK UP MODE SWITCH

Switch (1) is used when more power is needed rather than high
production (such as when dozing loose soil).
The drive is switched between torque converter drive and direct
drive according to the load. When it is ON, the lamp lights up.
ECONOMY MODE SWITCH

Switch (2) is used for hauling work after ripping or for dozing
blasted rock.
When the system is OFF, if the switch is pressed once, mode [1]
lights up, and if it is pressed again, mode [2] lights up.
Select the mode according to the type of rock.
REVERSE SLOW MODE SELECTOR SWITCH

Switch (3) is used to make small reductions in the travel speed
when traveling in R1, R2, or R3.
When it is turned ON, the lamp lights up.
3 - 19
.
SWITCHES
F (1) Starting switch F (5) Auto shift down switch

F (2) Buzzer cancel switch F (6) Pivot turn switch
F (3) Front lamp/ working lamp switch F (7) Information switch
F (4) Rear lamp switch F (8) Additional heater switch (if equipped)
STARTING SWITCH
Switch (1) is used to start the engine.
OFF
Key insertion-withdrawal position. None of electrical circuits
activate.
ON
Charging and electric device circuits activate. Keep key at the ON
position after starting.
START
At this key position, the starting motor will crank the engine.
Immediately after starting the engine, release the key which will
automatically return to the ON position.
3 - 20
.
BUZZER CANCEL SWITCH

When switch (2) is operated to the left or right, the alarm buzzer
stops.
When the information monitor is in the maintenance mode, switch
(2) can be operated to move the curser left or right.
(a) position: Cancel
(c) position: Select
FRONT LAMP/WORKING LAMP SWITCH

Switch (3) lights up when the front lamp, left and right working
lamps located on the front fender, and panel lamp light up.
(a) OFF position: Goes out
(b) ON position: Lights up
REAR LAMP SWITCH

This switch (4) lights up the rear lamps and panel lamps.
(a) OFF position: Lamps are out
(b) ON position: Lamps light up
AUTO SHIFT DOWN SWITCH

When this switch (5) is operated to the right, if the travel speed
drops because of the load conditions when traveling, the
transmission automatically shifts to low speed.
(a) OFF position: Automatic operation canceled
(b) ON position: Automatically shifts down to low speed
For details, see "AUTO SHIFT DOWN OPERATION (PAGE

3-99)".
3 - 21
.
PIVOT TURN SWITCH

This switch (6) makes it possible to carry out pivot turns.
OFF (a) position: Pivot turns cannot be carried out
ON (b) position: Pivot turns can be carried out
For details, see "MAKING SHARP TURNS TO LEFT WHILE

TRAVELING FORWARD (PAGE 3-103)".
INFORMATION SWITCH
This switch (7) is used to carry out the switching of the information
monitor display mode and the switching of the cursor with the
maintenance mode.
(a) position: Cursor moves to left
(c) position: Cursor moves to right
ADDITIONAL HEATER SWITCH

(if equipped)
This switch (8) is used to actuate the hot water heater.
(a) position: Hot water heater OFF
(b) position: Hot water heater Lo (ON)
(c) position: Hot water heater Hi (ON)
3 - 22
.
LAMPS
G(1) Warning lamp G(2) Filter/oil change interval lamp
WARNING LAMP
NOTICE
If alarm buzzer sounds, stop work immediately and perform inspection and
maintenance of the appropriate point.
When the caution lamp for the B CAUTION and C CAUTION

groups on the machine monitor system flashes, and an
abnormallity has occured in the electronic control system, lamp (1)
also flashes at the same time.
If the lamp flashes, check the monitor panel to locate the
abnormality.
When the monitor inside the C CAUTION group flashes, the alarm
buzzer also sounds continuously.
3 - 23
.
FILTER/OIL CHANGE INTERVAL LAMP

Lamp (2) lights when it comes near the time for replacing the filter
or oil.
3 - 24
.
METHOD OF USING DISPLAY PANEL B (Multi-information)
EXPLANATION OF MODES AND CONTROLS

Display panel B (1) has the function of displaying the following
four types of mode. (The diagram on the right shows the normal
screen before the mode display.)
Maintenance mode
This displays the time for replacing the filters or oil.
PM clinic auxiliary mode
This displays the engine speed and the oil pressure in the
hydraulic circuits.
Fault display mode
This displays the fault code is related to the electronic control.
Adjustment mode
This adjusts the brightness and contrast of the display.
There are variations (sub-items) in the four types of mode. For an explanation of the variations, see the following
items.
METHOD OF USING MAINTENANCE MODE (PAGE 3-27)
METHOD OF USING PM CLINIC AUXILIARY MODE (PAGE 3-29)
METHOD OF USING FAULT CODE DISPLAY MODE (PAGE 3-30)
METHOD OF USING USER ADJUST MODE (PAGE 3-31)
Each mode is operated by using information switch (2) and
buzzer cancel switch (3) on the dashboard in front of the
operator's seat.
After operating the switch, release the switch, and the switch will
return automatically to the center position as shown in the
diagram on the right.
The functions of each position of the switches are as follows.
<: Moves mode to left
>: Moves mode to right
: Selects mode
: Cancels mode
The four types of mode can be selected in a cycle by operating information switch (2) to > and < to give the
following sequence: Maintenance mode ←→ PM clinic auxiliary mode ←→ Fault code display mode ←→ Adju
stment mode ←→ Maintenance mode.
From the normal mode before giving the mode display, if buzzer cancel switch (3) is operated to and held for
2.5 seconds, the maintenance mode is displayed. After that, if information switch (2) is operated to >, the mode
changes to the PM clinic auxiliary mode. If information switch (2) is operated to <, the mode changes to the user
adjust mode.
When any mode is being displayed, if the buzzer cancel switch is operated to , the screen returns the normal
screen shown before the mode display.
3 - 25
.
METHOD OF SELECTING MODES

1. When moving from the normal operation display to a user
mode, the maintenance mode is displayed. Use the controls to
change the mode as follows.
> position: Go to PM clinic auxiliary mode
< position: Go to user adjust mode
position: Go to normal operation screen
position: Go to maintenance mode selection screen.
2. The diagram on the right shows the screen display for the PM
clinic auxiliary mode. Use the controls to change the mode as
follows.
> position: Go to fault code display mode
< position: Go to maintenance mode
position: Go to PM clinic auxiliary mode selection item
screen
3. The diagram on the right shows the screen display for the fault
code display mode. Use the controls to change the mode as
follows.
> position: Go to adjustment mode
< position: Go to PM clinic auxiliary mode
position: Go to fault code selection item screen
4. The diagram on the right shows the screen display for the user
adjust mode. Use the controls to change the mode as follows.
> position: Go to maintenance mode
< position: Go to fault code display mode
position: Go to user adjust mode selection item screen
3 - 26
.
METHOD OF USING MAINTENANCE MODE
NOTICE
This function is only a guideline. If dirty oil or filters are found during daily maintenance, replace them immediately.
If the controllers or monitor panel are replaced, the timer for this function will not work properly. Contact your Komatsu distributor
for replacement.
The maintenance mode shows the replacement interval for the oil
filters and oil on the monitor.
The content of the display is as follows.
(1) The item is displayed.
(2) The time remaining until replacement is displayed.
(3) The number of times that replacement has been made until
now is displayed.
The display items can be displayed in order by operating the

information switch to the left or right (<, >).
Time to 2nd and

Display Item Time to 1st replacement
following replacements
1. ENG.OIL Engine oil 500h 500h
2. ENG.FLT Engine oil filter 500h 500h
3. BYPS.FLT Bypass filter 0h 0h
4. FUEL.FLT Fuel filter 250h 500h
5. CORR.FLT Corrosion resistor 1000h 1000h
6. P/L.OIL Power train oil 250h 1000h
7. P/L.FLT Power train oil filter 250h 500h
8. HYD.OIL Hydraulic oil 250h 2000h
9. HYD.FLT Hydraulic filter 250h 2000h
10. CHG.FLT HSS charge filter 1000h 1000h
11. DAMP.OIL Damper oil 2000h 2000h
12. F/D.OIL Final drive oil 250h 2000h
When the oil or filter has been replaced, select the applicable item,
then operate the buzzer cancel switch to .
The screen will ask if you want to display the replacement history.
Operate the information switch to select YES, then operate the
buzzer cancel switch to . The replacement account will increase
by 1, the replacement interval will be reset, and the oil, filter change
interval lamp will go out.
When this is done, if the maintenance caution lamp does not go
out, there is another item close to the replacement time, so check
the situation.
3 - 27
.
REMARK
To return to the function selection mode, operate the buzzer cancel
switch to .
3 - 28
.
METHOD OF USING PM CLINIC AUXILIARY MODE
CAUTION
When moving the work equipment or setting the transmission to the travel position for carrying out measurements, check
carefully that the situation is safe.
The PM clinic auxiliary mode displays the engine speed, hydraulic oil pressure, and other items on display panel B.
Display panel B displays the item on the top line (1), and the
measured value on the bottom line (2).
The display items consist of the six items in the table below.
The items can be selected by operating the information switch (<, >).
Display Item Measured value

01-ENG.SPEED Engine speed Speed (rpm)
02-BOOST PRSSURE Boost pressure Pressure (kPa)
03-HYD.PUMP PRES Hydraulic oil pressure Pressure (MPa)
04-BATTERY VOLT Battery voltage Voltage (mV)
05-HSS PUMP-A HSS A circuit pressure Pressure (MPa)
06-HSS PUMP-B HSS B circuit pressure Pressure (MPa)
REMARK
Items such as the engine speed fluctuate and are difficult to see during the measurement. In such cases, operate
the buzzer cancel switch to . This makes it possible to hold the display of the value.
To cancel this mode, operate the buzzer cancel switch again to .
To return to the function selection mode, operate the buzzer cancel switch to .
3 - 29
.
METHOD OF USING FAULT CODE DISPLAY MODE

NOTICE
The fault items observed by this function are connected with the electronic control, so even if a fault code is not displayed, there
is probably some problem with the machine. If the operator feels any problem with the machine, the machine should be stopped
immediately and checked.
When any disconnection or short circuit in any sensor is detected, the location and fault code are displayed by a
6-digit code on display panel B. When contacting your Komatsu distributor, inform your distributor of the code at the
same time.
If the failure observation function has not determined the condition
of the machine, the display is as shown in the diagram on the right.
With this function, existing failures can be displayed up to a

maximum of 20 items.
If multiple failures are occurring, the display automatically changes
every 2 seconds, so check the code.
The display is shown repeatedly.
REMARK
3 - 30
.
METHOD OF USING USER ADJUST MODE

With the user adjust mode, the brightness of the panel screen backlighting and the contrast of the liquid crystal panel
can be changed, or the cooling fan can be set to maximum speed to clean the radiator when it is clogged.
These are displayed on display panel B.
1. Adjusting backlighting of liquid crystal display

The diagram on the right is the mode for adjusting the
brightness of the backlighting of the liquid crystal panel. On
this screen, operate the buzzer cancel switch to to switch to
the screen to adjust the brightness.
The brightness can be adjusted by operating the information

switch.
The higher the number, the brighter the screen becomes; the lower
the number, the darker the screen becomes.
> position: Number increases
< position: Number decreases
When the buzzer cancel switch is operated to , the brightness of

the liquid crystal display backlighting is set.
2. Adjusting backlighting of message display

The diagram on the right is the mode for adjusting the
brightness of the backlighting of the message display. On the
screen, operate the buzzer cancel switch to to switch to the
screen for adjusting the brightness.
3 - 31
.
The brightness can be adjusted by operating the information

switch.
The higher the number, the brighter the screen becomes; the lower
the number, the darker the screen becomes.
When the buzzer cancel switch is operated to , the brightness of

the message display backlighting is set.
3. Adjusting contrast of liquid crystal message display

The diagram on the right is the mode for adjusting the contrast
of the liquid crystal message display.
On this screen, operate the buzzer cancel switch to to
switch to the screen to adjust the contrast.
The contrast can be adjusted by operating the information switch.

The higher the number, the deeper the screen becomes; the lower
the number, the lighter the screen becomes.
When the buzzer cancel switch is operated to , the contrast of

the liquid crystal display is set.
3 - 32
.
4. Mode to rotate cooling fan at maximum speed

The diagram on the right is the mode for rotating the cooling fan
at maximum speed. On this screen, operate the buzzer cancel
switch to to rotate the cooling fan at the maximum speed.
Note that this mode is effective only when the display in the
diagram on the right is being given. After leaving this mode, the
screen returns to the normal mode.
REMARK
The brightness of the backlighting of the monitor panel differs according to whether the front lamp is lighted up
or not. Entering this mode when the front lamps are lighted up makes it possible to adjust the brightness when
the front lamps are lighted up. In the same way, entering this mode when the front lamps are not lighted up
makes it possible to adjust the brightness when the front lamps are not lighted up.
3 - 33
.
SWITCHES
(1) Horn switch (4) Cigarette lighter

(2) Room lamp switch (5) Accessory socket
(3) Wiper switch
HORN SWITCH
The horn sounds when button (1) at rear of the blade control lever
at the right side of operator's seat is pressed.
ROOM LAMP SWITCH

Switch (2) lights the room lamp.
ON position: Lamp lights up
OFF position: Lamp is out
3 - 34
.
WIPER SWITCH
Switch (3) activates the wipers.
The wiper switches are as follows.
(A) Rear window
(B) Right door
(C) Left door
(D) Front window
This is also used as the window washer switch.
The switch is operated as follows.
Window washer only

Keep the switch pressed to the OFF position to spray out water.
Wiper only
If this is switched on, the wiper will start.
Wiper and window washer

If this is kept pressed to the ON position while the wiper is
working, water will be sprayed out.
3 - 35
.
REMARK
When installing the cab, check the colors of the washer tank and
window washer hoses, and be sure to connect correctly.
CIGARETTE LIGHTER
Lighter (4) is used to light cigarettes.
When the cigarette lighter is pushed in, it will return to its original
position after a few seconds, so take it out to light your cigarette.
Cigarette lighter capacity: 120W
NOTICE
This cigarette lighter is 24V. Do not use it as the power source for 12V
equipment.
3 - 36
.
ACCESSORY SOCKET
Socket (5) is used as the power source for a wireless or other 12V
equipment.
3 - 37
.
CONTROL LEVERS, PEDALS
(1) Fuel control dial (6) Work equipment lock lever

(2) Joystick (steering, directional and gear shift lever) (7) Blade control lever
(3) Brake pedal (8) Ripper control lever
(4) Deceleration pedal (9) Pin puller control switch (for giant ripper)
(5) Parking brake lever
FUEL CONTROL DIAL

Dial (1) is used to control the engine speed and output.
(a) Low idling position: Turn fully to the left
(b) High idling position: Turn fully to the right
REMARK
When stopping the engine, turn the starting switch to the OFF
position.
3 - 38
.
JOYSTICK (STEERING, DIRECTIONAL AND GEAR SHIFT LEVER)

(PCCS lever)
This lever (2) is used to switch between forward and reverse, to
steer the machine, or carry out counterrotation turns.
REMARK
PCCS: Palm command control system
Forward-reverse shifting
Position (a): FORWARD
Position (b): REVERSE
Position N: Neutral
Move to the front to drive forward; move to the rear to drive in
reverse.
Steering
Position (L): Left turn
Position (R): Right turn
With the lever operated to the front or rear, operate the lever partially to the left or right to turn the machine. The
machine will turn gradually in the same direction as the lever is operated.
If the lever is operated fully to the left or right, the machine will turn in a small radius.
REMARK
If the lever is released when steering the machine, the lever will return to the (a) position or the (b) position and
the machine will be returned to straight movement.
Gear shifting
When the steering, directional, and gearshift lever is at the
FORWARD or REVERSE position and switch (c) or switch (d) is
pushed, the transmission speed will change.
UP switch (c): Each time the switch is pressed, the transmission
will shift up one speed.
DOWN switch (d): Each time the switch is pressed, the
transmission will shift down one speed.
For details of the maximum speed in each speed range, see
"SPECIFICATIONS (PAGE 5-2)".
REMARK
The speed range being used is displayed on the monitor panel according to the gearshift operation.
<Example>
Neutral: N is displayed on the display panel.
FORWARD 2nd: F2 is displayed on the display panel.
REVERSE 3rd: R3 is displayed on the display panel.
When the parking lever is locked, P is displayed.
For details of the method of shifting gear according to the shift mode, see the "SHIFTING GEAR (PAGE 3-97)".
Shift mode selection means that the selected speed range is displayed at the N position before starting.
3 - 39
.
Operating counterrotation turn
WARNING
When operating the counterrotation turn, if the load on the left and right is
not balanced, the machine may make a pivot turn, so check the ground
conditions and be careful not to hit any obstacles when carrying out the
operation.
With the lever at the N position, move the lever partially in the
direction of turn. The left and right tracks will rotate in opposite
directions, and the machine will make a slow counterrotation turn.
If the lever is operated further, the speed of the counterrotation turn
will increase.
(R): Right counterrotation turn
(L): Left counterrotation turn
BRAKE PEDAL
WARNING
Do not place your foot on this pedal unnecessarily.
Depress the pedal (3) to apply the right and left brakes.
DECELERATION PEDAL
WARNING
Do not place your foot on this pedal unnecessarily.
When passing over the top of a hill or when a load is dumped over a cliff,
the load is suddenly reduced, so there is danger that the travel speed
will also increase suddenly. To prevent this, depress the decelerator
pedal to reduce the travel speed.
Pedal (4) is used when reducing engine speed or stopping the

machine.
When switching between forward and reverse, or when stopping
the machine, use this pedal to reduce speed.
REMARK
When operating the deceleration pedal, there may be a particular
noise, but there is no problem with quality or durability.
3 - 40
.
PARKING LEVER
WARNING
When the machine is parked, always set the parking lever to the LOCK
position.
Lever (5) is used to apply the parking brake.
REMARK
Before moving the parking brake lever to the LOCK position,
return the steering, directional, and gearshift lever to the N
position.
When starting the engine, if the parking brake lever is not in the
LOCK position, the limit switch is actuated and it is impossible
to start the engine.
WORK EQUIPMENT LOCK LEVER
WARNING
When standing up from the operator's seat, always the work equipment
lock lever securely to the LOCK position.
If the blade control and ripper control levers are not locked and are
touched by accident, it may lead to serious injury or damage.
If the work equipment lock lever is not securely to the LOCK position,
the lock may not be applied.
Check that it is in the position shown in the diagram.
When parking the machine or when performing maintenance, always
lower the blade or ripper to the ground, then set the work equipment
lock lever to the LOCK position.
Lever (6) is a device to lock the blade control and ripper control levers.
When it is set to the LOCK position, the TILT, RAISE, LOWER, and FLOAT operations are locked.
REMARK
When starting the engine, to ensure safety, always set the work equipment lock lever to the LOCK position.
3 - 41
.
BLADE CONTROL LEVER

Lever (7) is used to raise the blade.
Single tiltdozer
Lever (7) is used to raise or tilt the blade.

Lifting control
(a) RAISE:
(b) HOLD:
Blade is stopped and held in this position.
(c) LOWER:
(d) FLOAT:
Blade will move freely according to external force.
REMARK
When released from FLOAT position, this lever (7) will not return to
HOLD position, so it must be returned to HOLD by hand.
Tilting control
(A) RIGHT TILT
(B) LEFT TILT
DUAL TILTDOZER
Operate the tilt switch to the (D) position.
3 - 42
.
Lever (7) is used to raise or tilt the blade.

Lifting control
(a) RAISE:
(b) HOLD:
Blade is stopped and held in this position.
(c) LOWER:
(d) FLOAT:
Blade will move freely according to external force.
REMARK
When released from FLOAT position, this lever (7) will not return to
HOLD position, so it must be returned to HOLD by hand.
TILT OPERATION
(A) RIGHT TILT
(B) LEFT TILT
REMARK
With the dual tilt operation, a larger amount of tilt can be
obtained than with the single tilt operation.
With the dual tilt operation, the blade can be operated to RAISE,
HOLD, or LOWER.
Single tilt operation

Operate the tilt switch to the (C) position.
(A) RIGHT TILT
(B) LEFT TILT
3 - 43
.
Pitch control
Rear pitch (cutting angle reduced)
Carry out operation (B) with the pitch button pressed.
Forward pitch (cutting angle increased)

Carry out operation (A) with the pitch button pressed.
REMARK
With the pitch operation, the blade can be operated to any of RAISE, HOLD, or LOWER.
For details of the effective use of the dual tilt dozer, see "EFFECTIVE METHOD OF OPERATION FOR DUAL
TILT DOZER (PAGE 6-6)".
To operate the pitch, keep the pitch button pressed and operate the blade control lever to the left or right to start
the operation.
The pitch is the priority circuit, so if the pitch button is pressed during single tilt operation, the pitch will be
actuated.
3 - 44
.
RIPPER CONTROL LEVER

(For variable ripper)
Lever (8) is used to operate the ripper.
(a) RAISE
(b) HOLD: Ripper is stopped and held in the same position.
(c) LOWER
(A) Digging angle reduced: Cutting angle (α) becomes smaller.
(B) Digging angle increased: Cutting angle (α) becomes larger.
3 - 45
.
ADJUSTING FRONT-REAR POSITION OF RIPPER CONTROL LEVER

(Range of adjustment: ± 40 mm (1.6 in))
Lever (8) position can be adjusted to best suit the operator's

physique. Follow the steps below for the adjustment.
Adjustment within range of 40 mm (1.6 in) from neutral to rear
1. Loosen lock nut (1) with a wrench.
2. Set lever (2) to the optimum position.
3. Tighten lock bolt (1) with the wrench to hold lever (2) in position.
Adjustment within range of 40 mm (1.6 in) from neutral to front

1. Remove lock bolt (1) with a wrench.
2. Remove lever (2) and reverse it 180°
3. Install lever (2) to lever (5), then set it to the optimum position.
4. Tighten lock bolt (1) with the wrench to hold lever (2) in position.
5. Loosen nut (3).
6. Reverse knob 180°.
7. Tighten nut (3).
PIN PULLER CONTROL SWITCH (IF EQUIPPED)

Switch (9) is used to operate the pin puller.
(a) PULL OUT: Pin is pulled out.
(b) PUSH IN: Pin is pushed in.
DUST INDICATOR
This is on the air cleaner bracket inside the engine room.
This device indicates that the air cleaner element is clogged.
For details on how to clean the element, see "CHECK, CLEAN
AND REPLACE AIR CLEANER ELEMENT (PAGE 4-24)".
3 - 46
.
POWER SOURCE
The cigarette lighter socket (1) can be used as a power source for
24V equipment and the accessory socket (2) can be used for 12V
equipment.
NOTICE
The power from the cigarette lighter socket is 24V. Do not use this as the
power source for any 12V equipment.
The capacity of the cigarette lighter power source is 120W (24V x 5A).
3 - 47
.
FUSE BOX
NOTICE
Before replacing a fuse, be sure to turn starting switch to the OFF position.
Fuses protect the electrical equipment and wiring from burning out.
If a fuse becomes corroded, or white powder can be seen, or a fuse is loose in the holder, replace the fuse.
Replace a fuse with another of the same capacity.
Chassis
Open the fuse inspection cover at the bottom front left of the
operator's compartment. Fuse box I is installed inside.
(1) Fuse box fs1

(2) Fuse box fs2
(3) Fuse box fs4
(4) Circuit breaker
Cab (machines equipped with cab)

Fuse box II is installed at the bottom of the overhead panel.
3 - 48
.
CIRCUIT BREAKER
If the starting switch does not work, open the circuit breaker box
and check.
If excessive current flows through the circuit breaker, it cuts off
the electric circuit to prevent damage to the electrical
components and wiring.
To restore the electric circuit after it has been cut off, push in
reset button (1). (This springs out when the circuit is cut off.)
If the electric circuit is normal, reset button (1) will stay pushed
in. If it comes out immediately when it is pushed in, the electric
circuit must be checked.
No. Capacity Circuit

(1) 20A Steering controller
(2) 20A Monitor panel
(3) 20A Transmission controller
(4) 20A Air con main power
(5) 20A Head lamp
(6) 20A Starter switch
REMARK
The circuit breaker is a device installed in electric circuits where a large current flows. It is installed to protect the
electric circuit. It protects the electric components and wiring from damage caused by an abnormal current in the
same way as a normal fuse. After repairing and restoring the location of the abnormality, there is no need to replace
the breaker. It can be used again.
3 - 49
.
FUSE CAPACITY AND NAME OF CIRCUIT
FUSE BOX I
(1) Fuse box fs1
Fuse
No. Circuit
capacity
1 20A
2 20A CAB continuous power
3 10A -
4 10A -
5 20A VHMS continuous power
(2) Fuse box fs2
Fuse
No. Circuit
capacity
1 20A Auxiliary power 1
2 20A Fuel pump power
3 20A Add heater power
4 20A Work lamp
5 20A Rear lamp
(3) Fuse box fs4
Fuse
No. Circuit
capacity
1 20A Back up alarm
2 20A Auxiliary power 2
3 20A VHMS controller
4 20A Ribbon heater, Horn
5 20A Auxiliary acc signal
3 - 50
.
FUSE BOX II
Fuse
NO. Circuit
capacity
(1) 10A Radio memory
(2) 20A Radio, lamp, cigarette lighter
(3) 10A Rear wiper
(4) 10A Right door wiper
(5) 10A Front wiper
(6) 10A Left door wiper
FUSIBLE LINK
If the starting motor does not work even when the starting switch is
turned to the ON position, there may be a disconnection in fusible
links (2) and (3) on top of the wiring, so remove the cover (1) at the
side of the battery box cover on the left side of the machine and
check or replace.
Capacity of (2): 32 A
Capacity of (3): 96 A
REMARK
A fusible link refers to the large-sized fuse wiring installed in the high current flow portion of the circuit to protect
electrical components and wiring from burning, similar to an ordinary fuse.
3 - 51
.
DOOR OPEN LOCK

Use this when your want to keep the door held open.
1. Push the door against door catch (1). The door will be held by
the door catch.
2. To release the door, move lever (2) inside the cab forward. This
will release the catch.
NOTICE
When keeping the door open, secure it to the catach.
Always close the door when traveling or carrying out operations.
Leaving the door open will cause the door to break.
Keep the door locked open securely. The door may swing closed
because of the vibration.
SASH GLASS INTERMEDIATE LOCK

When working with the cab sash glass open, use this lock to
prevent the glass from chattering.
When the lever is in the FREE position, the glass can be opened
or closed.
When the lever is moved to the LOCK (up or down) position, the
glass is fixed in position.
If the glass is not held securely, set the lever in the FREE
position and rotate clockwise to strengthen the holding power.
To reduce the holding power, turn counterclockwise.
NOTICE
Always close the window when traveling or carrying out operations.
Leaving the window open will cause the window to break.
3 - 52
.
DOOR POCKET
This is inside the left and right doors. Use it for keeping things.
Do not put the heavy tools or other heavy objects in it.
If the pocket is dirty, loosen four bolts (1), then remove the pocket
and rinse it.
ASHTRAY
This is on the left side of the operator's seat.
Always make sure that you extinguish the cigarette before closing
the lid.
TOOL BOX
This is inside the front of the right fender.
It is used for storing tools.
3 - 53
.
CAR STEREO, HANDLING
EXPLANATION OF COMPONENTS
(1) Power switch/volume (8) Cassette door

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

(B) Metal tape display (F) Preset channel display
(C) FM stereo reception display (G) Time/frequency display
(D) Loudness display
3 - 54
.
POWER SWITCH/VOLUME
Turn this knob (1) to the right until it clicks to turn the power on.
Turn it further to increase the volume.
AUTO-STORE/PRESET SCAN BUTTON

Use this button (2) to actuate the preset scan and auto-store
functions.
Auto-store
Each time this button is pressed for more than 2 seconds while
in radio reception, this auto-store function automatically starts to
search for the desired station within a receivable band, and
memorize the frequency in the preset memory. During this
scanning process, the frequency shown in the right side of
display continues to change. This indicates that each frequency
is memorized in the auto-store.
REMARK
The auto-store function cannot be used when the channel display
is flashing.
When the display is flashing, the preset scan function is being
used.
Preset scan
If this button is pressed for less than 0.5 second while in radio reception, programs from the six preset stations
in the same band will be broadcast one after another for 5 seconds each, starting from No. 1 through No. 6
stations consecutively.
When the desired station is found, press the button again. This stops the preset scan tuning process and switches
to ordinary broadcasting. The same process will be repeated continuously until the button is pressed again.
BASS CONTROL KNOB

Turn this button (3) to the left to reduce the low tones; turn it to the
right to emphasize the low tones.
Direction (a): Low tone reduced
Direction (b): Low tone emphasized
3 - 55
.
TREBLE CONTROL KNOB

Turn this button (4) to the left to reduce the low tones; turn it to the
right to emphasize the high tones.
Direction (a): High tone reduced
Direction (b): High tone emphasized
LOUDNESS BUTTON
This button (5) is used when playing at low volume. It makes it
possible to hear more easily by emphasizing the low tone when the
low tones are weak.
Push button: Actuated (ON)
Push button again: Canceled (OFF)
TIME/RADIO DISPLAY SELECTOR BUTTON

This button (6) is used to switch between the "Radio/tape display"
and the "Time display".
Correcting the time

Press the button to set the time display.
(A) Correcting hour:
Keep the DISP button pressed and press the bottom (H) of
the TUNING button to correct the hour.
(B) Correcting minute:
Keep the DISP button pressed and press the top (M) of the
TUNING button to correct the minute.
3 - 56
.
TAPE EJECT BUTTON

This button (7) is used to stop the tape and to eject the cassette.
When this button is pressed, the tape is ejected and the radio
plays.
CASSETTE DOOR
Set the cassette with the exposed portion of the tape on the right
side and insert it through the cassette door (8).
FAST FORWARD, REWIND BUTTONS

These buttons (9) are used to fast-forward or rewind the tape.
Fast-forward/rewind
If you press the button pointing in the same direction as the
lighted arrow indicating the direction of play, the tape will be
fast-forwarded; if you press the button pointing in the opposite
direction, the tape will rewind.
To stop the tape, lightly press the button that is not locked. The
fast-forward or rewind operation will be canceled.
If the fast forward and rewind buttons are pressed at the same
time, the tape will change sides.
PRESET BUTTONS
These buttons (10) are used to call up the broadcast station
frequencies preset in memory for each of buttons No. 1 to No. 6.
It is possible to preset 18 stations (FM: 12; AM: 6) with these
buttons.
3 - 57
.
METAL TAPE BUTTON

(used also for preset button No. 5)
This button (11) is used when playing a metal or chrome tape. This
button is also used for preset button No. 5. When it is pressed,
"MTL" appears on the display.
MANUAL TUNING BUTTONS

These buttons (12) are used for manual tuning.
When "TUN ∧" button is pressed, the frequency goes up; when
"TUN ∨" button is pressed, the frequency goes down. If the button
is pressed down and held, the frequency will change continuously.
SEEK TUNING BUTTONS

These buttons (13) are used to seek tuning.
When the "SEEK UP" button is pressed, the search automatically
goes up; when the "SEEK DOWN" button is pressed, the search
automatically goes down.
When the next station that can be received is found, it
automatically stops.
BAND SELECTOR BUTTON

When this button (14) is pressed, the band is switched between
FM1, FM2, and MW (AM). The band is shown on the display.
3 - 58
.
METHOD OF OPERATION
METHOD OF SETTING PRESET BUTTONS

It is possible to preset 6 MW (AM) stations and 12 FM stations (FM1: 6 stations, FM2: 6 stations).
REMARK
If you are playing the cassette, press the tape eject button to stop the tape.
METHOD OF AUTO PRESET

1. Use band selector button (1) to select MW (AM), FM1 or FM2.
2. Press auto-store/preset scan button (2) for less than 0.5
second.
3. The preset scan tuning function automatically searches for the
desired station within the same band and can memorize as
many as six stations in the preset memory.
METHOD OF MANUAL PRESET

2. Press manual tuning buttons (2) or seek tuning buttons (3).
3. Press preset button (4) of the number to be preset for 2
seconds while the frequency display is being shown on the
display. (The preset channel and frequency are displayed and
the presetting is completed).
4. Repeat the steps explained in Item 2 and 3 above to preset
other stations to the subsequent numbers.
5. If you want to preset a station in the other bands, follow the
steps explained in Item 1 through 4 above.
REMARK
Also, use Steps 2 and 3 when changing the setting of a preset
switch to another station.
When the power is disconnected, such as when the battery is
replaced, all the settings are deleted, so preset the stations
again.
3 - 59
.
LISTENING TO RADIO
1. Turn the starting switch ON, then turn power switch (1) ON.
3. Select the station with the preset buttons (3).
REMARK
In case you do not promptly remember the number assigned to a
certain preset station, press auto-store/preset scan button (4) for
less than 0.5 second. The preset six stations will broadcast one
after another for five seconds each. When the desired station
broadcasts, press the button again and scan tuning stops.
4. If you want to tune in to a station that is not preset, use either

seek tuning button (5) or manual tuning button (6).
5. Adjust the volume, balance, and tone as desired.
6. When turning the radio OFF, turn power switch (1) to the left
until it clicks.
REMARK
To switch to the radio when listening to a cassette, press the cassette eject button to stop the tape.
If you insert a cassette when listening to the radio, the tape will start to play.
LISTENING TO CASSETTE TAPE

1. Turn the starting switch ON, then turn power switch (1) ON.
2. Set the cassette with the exposed portion of the tape on the
right side and push it past the cassette door. The tape will
automatically start playing.
If the arrow indicating the direction of play is pointing to the
right, the top side is being played; if the arrow is pointing to the
left, the bottom side is being played.
When the tape reaches the end, it is automatically reversed
and the other side starts to play.
3. When finishing with the tape, press the cassette eject button to
eject the tape and automatically switch to the radio.
3 - 60
.
REVERSING TAPE
When listening to the tape, press both FAST FORWARD,
REWIND buttons (A) and (B) at the same time lightly.
When this is done, the tape direction display will be reversed.
PRECAUTION WHEN USING

WARNING
If a voltage greater than the specified voltage is input, it may cause fire, electrocution, or other failure. Never input any voltage
other than the specified voltage.
Places inside the radio are under high voltage. Do not remove the cover.
Do not carry out any modifications. This may cause fire, electrocution, or other failure.
If the sound cannot be heard, nothing is displayed, or any other abnormality occurs, turn off the power switch and ask your
Komatsu distributor to make repairs without delay.
Stow the antenna when traveling in places with low overhead clearance.
To ensure safety during operations, keep the volume at a level where it is possible to hear other machines.
If water gets inside the speaker case or radio (auto tuning), it may cause a serious problem, take care not to let
water get in these items.
Do not wipe the scales or buttons with benzene, thinner, or any other solvent. Wipe with a soft dry cloth. Use a
cloth soaked in alcohol if the equipment is extremely dirty.
NOTICE
Handling cassette tape
Clean the tape head approx. once a month with a commercially available head cleaning tape.
Do not leave the tape any place where it is exposed to direct sunlight, any place that is excessively dusty, or any place where
there is a magnetic field.
Do not use 120-minute tapes. The tape is thin and it easily gets caught up inside the machine.
If the tape is slack, it easily gets caught up inside the machine. Use a pencil to wind in the tape to remove any slack.
Do not use any cassette tape if the label has started to come off. It may cause defective rotation, or it may be impossible to get
the tape out of the machine.
3 - 61
.
AIR CONDITIONER, HANDLING
GENERAL LOCATIONS OF CONTROL PANEL
(1) Vent selector lever (4) Air flow selector switch

(2) FRESH/RECIRC selector switch (5) Air conditioner switch
(3) Temperature control switch (6) OFF switch
VENT SELECTOR SWITCH (sending air to upper half of cab)

If lever (1) is pulled to position (b), the air from the air conditioner
is all directed to the upper half of the cab.
This can be used when sending a cool breeze during hot weather.
VENT SELECTOR SWITCH (sending air to feet)

If lever (1) is pushed to position (a), the air from the air conditioner
is all directed to the feet.
This can be used to send warm air to the feet during cold weather.
3 - 62
.
FRESH/RECIRC SELECTOR SWITCH (RECIRCULATE)

When switch (2) is pressed, the air inside the cab is recirculated
and no fresh air is taken in from outside. This position is used when
heating or cooling the cab quickly or when the outside air is dirty.
FRESH/RECIRC SELECTOR SWITCH (FRESH)

When switch (2) is pressed, fresh air is taken into the cab during
heating or cooling.
This position is used to bring in clean fresh air into the cab or to
remove the mist from the cab windows.
TEMPERATURE INDICATOR
The further the indicator is in the blue range, the lower the
temperature is; the further the indicator is in the red range, the
higher the temperature is.
The indicator range is divided into 7 levels, but within each range
the temperature changes sleeplessly.
TEMPERATURE CONTROL SWITCH (COOL)

Use switch (3) to reduce the temperature.
Press this switch to reduce the temperature of the air sent from the
air conditioner.
The lower the temperature becomes, the further the indicator
moves into the blue range.
3 - 63
.
TEMPERATURE CONTROL SWITCH (WARM)

Use switch (3) to increase the temperature.
Press this switch to increase the temperature of the air sent from
the air conditioner.
The higher the temperature becomes, the further the indicator
moves into the red range.
AIR FLOW SELECTOR SWITCH (LO)

Switch (4) is used to set the flow of air from the air conditioner to
LOW.
When this switch is pressed, the air flow is set to the minimum
amount of the three available levels.
AIR FLOW SELECTOR SWITCH (MID)

Switch (4) is used to set the flow of air from the air conditioner to
MID. When this switch is pressed, the air flow is set to the medium
AIR FLOW SELECTOR SWITCH (HI)

Switch (4) is used to set the flow of air from the air conditioner to HI.
When this switch is pressed, the air flow is set to the maximum
3 - 64
.
AIR CONDITIONER SWITCH

This switch (5) is used to switch the air conditioner ON/OFF.
REMARK
For machines equipped with a heater only, switch (5) is not available. (Option)
OFF SWITCH
Switch (6) is used to stop operation of the fan.
REMARK
When fresh air is taken into the cab, air pressure in the cab
increases, which prevents the dust from entering. When neither
heating nor cooling is needed, bring in clean fresh air to prevent the
dust from coming in with your preferred air flow.
PRECAUTIONS WHEN USING AIR CONDITIONER
WHEN CARRYING OUT COOLING, VENTILATE THE CAB FROM TIME TO TIME
If you smoke when using the air conditioner, your eyes may start to itch or burn, therefore ventilate the cab every
so often to remove the smoke.
When the air conditioner is used for long periods, carry out ventilation once every hour.
BE CAREFUL NOT TO COOL TOO MUCH

For reasons of health, it is recommended that the cab should feel pleasantly cool when you enter it from the
outside (5 to 6°C (9.0 to 10.8°F) lower than the outside temperature). Pay attention to the temperature when
carrying out cooling.
SET SO THAT COLD AIR DOES NOT DIRECTLY BLOW ONTO THE GLASS SURFACE
If the vents (left and right) in the middle of the dashboard are turned so that cold air plays directly on the cab door
glass, moisture may condense on the outside of the cab door glass and reduce the visibility. (This occurs
particularly in high temperatures.)
If this happens, turn the vent fully to the rear and raise the air conditioner temperature setting slightly.
3 - 65
.
CHECKS DURING OFF-SEASON

Even during the off-season, run the compressor at low speed for several minutes once a week to prevent the loss
of the oil film at the lubricated parts of the compressor. (Run the engine at low speed and set the temperature control
lever at the central position.)
REMARK
When the ambient temperature is low, if the compressor is suddenly run at high speed, it may cause failure of the
compressor. Note that the system is set so that the compressor will not run when the cooler switch is turned on, if
the ambient temperature is less than 2 to 6.5°C (35.6 to 43.7°F).
PROCEDURE FOR REPLACING RECEIVER

Replace the receiver once every two years.
After replacing the receiver, add compressor oil. Turn the receiver at an angle and measure the oil remaining inside
the receiver, then add the same amount of oil (Denso Oil 6) to fill the receiver.
REMARK
The replacement interval may become shorter depending on the conditions during use.
If the receiver is used when the moisture absorption limit of the desiccant has been exceeded, the refrigerant
circuit may become blocked and cause the compressor to break down.
PRECAUTIONS WHEN REPLACING RECEIVER

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

If the compressor belt is loose, or the refrigerant level is low, cooling is not carried out efficiently.
For details, see "WHEN REQUIRED (PAGE 4-20)".
CLEANING AIR FILTER

If the air filter for the FRESH or RECIRC air intake becomes clogged, the cooling or heating capacity will drop.
To prevent this, clean the air filter with compressed air once a week.
For details of the cleaning method, see "WHEN REQUIRED (PAGE 4-20)".
3 - 66
.
ACCUMULATOR, HANDLING
WARNING
On machines equipped with an accumulator, for a short time after the engine is stopped, if the work equipment control lever is
moved to the LOWER position, the work equipment will move down under its own weight.
After stopping the engine, always place the work equipment lock lever and parking lever in the LOCK position.
The accumulator is charged with high-pressure nitrogen gas, so improper operation may cause an explosion which will lead to
serious injury or damage. When handling the accumulator, always do as follows.
Pressure in the control circuit cannot be completely removed. When removing the hydraulic equipment, do not stand in the
direction that oil spurts out when performing the operation.
Loosen the bolts slowly.
Do not disassemble the accumulator.
Do not bring it near flame or dispose of it in fire.
Do not make holes in it or weld it.
Do not hit it, roll it, or subject it to any impact.
When disposing of the accumulator, the gas must be released. Contact your Komatsu distributor for proper disposal.
The accumulator is a device to store the pressure in the control

circuit, and when it is installed, the control circuit can be operated
for a short time even after the engine is stopped.
Therefore, if the control lever is moved in the direction to lower the
work equipment, it is possible for the work equipment to move
under its own weight.
The accumulator is installed in the position shown in the diagram
on the right.
METHOD OF RELEASING PRESSURE IN OPERATING CIRCUIT ON MACHINE EQUIPPED WITH

ACCUMULATOR
1. Lower the work equipment and stop the engine.
2. After stopping the engine, operate control lever full strokes to the front, rear, left, and right to release pressure
inside the work equipment circuit.
However, the pressure cannot be completely released, so if accumulator in the work equipment circuit is
removed, loosen the screws slowly, and never stand in the direction oil spurts out.
3 - 67
.
OPERATION OPERATION
OPERATION
CHECK BEFORE STARTING ENGINE, ADJUST
WALK-AROUND CHECK
Before starting the engine, look around and under the machine to check for loose nuts and bolts, or leakage of oil,
fuel, or coolant, and check condition of the work equipment and hydraulic system. Also check for loose wiring, play,
and accumulation of dust at places which high temperatures.
WARNING
Leakage of oil or fuel, or accumulation of flammable material around high temperature parts, such as the engine muffler or
turbocharger, may cause fire.
Check carefully, and if any abnormality is found, repair it or contact your Komatsu distributor.
Do not get on or off the machine from the rear. Using this position is dangerous because it is easy to slip and you cannot be
seen from the operator's compartment. Always use the handrail and step at the side when getting on or off the machine.
If the machine is at an angle, make it horizontal before checking.

Before starting the engine, look around the machine and under the machine to check for loose nut or bolts, or
leakage of oil, fuel, or coolant, and check the condition of the work equipment and hydraulic system. Check also for
loose wiring, play, and collection of dust at places which reach high temperatures.
Always carry out the items in this section before starting the engine each day.
1. Check for damage, wear, play in work equipment, cylinders, linkage,hoses

Check for cracks, excessive wear, play in wotk equipment, cylinders, linkage, and hoses. If any abnormality is
found, repair it.
2. Remove dirt and debris from around the engine, battery, and radiator
Check for dirt accumulated around the engine or radiator. Also check for flammable material (dry leaves, twigs,
grass, etc.) accumulated around the battery, engine muffler, turbocharger, or other high temperature engine
parts. If any dirt or flammable materials are found, remove them.
3. Check for coolant and oil leakage around the engine

Check for oil leakage from the engine and coolant leaks from the cooling system. If any abnormality is found,
repair it.
4. Check for leakage of oil from power train case, final drive case, hydraulic tank, hose, joints
Check that there is no oil leakage. If any abnormality is found, repair the place where the oil is leaking.
Check for leakage of oil from the undercover. Check the ground for traces of oil leakage.
5. Check the undercarriage (track, sprocket, idler, guard) for damage, wear, loose bolts, or leakage of oil from
rollers
If any damage, wear, or oil leakage is found, repair the problem and tighten the bolts.
6. Check for damage to handrail and loose bolts

Repair any damage and tighten any loose bolts.
7. Check for damage to gauges, lamps on the instrument panel, and loose bolts
Check for damage to the panel, gauges, and lamps. Replace any damaged parts. Clean off any dirt on the
surface.
3 - 68
.
OPERATION OPERATION
8. Check for damage to seat belt and mounting clamps

Check that there is no abnormality in the seat belt or mounting clamps. If there is any damage, replace with new
parts.
3 - 69
.
OPERATION OPERATION
CHECK BEFORE STARTING

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

1. Turn starting switch (1) to the ON position.
2. Check that the monitor and gauges light for 2 seconds, the
warning lamps light up for 1 second, and the alarm buzzer
sounds for 2 seconds.
REMARK
If the lamps do not light, there may be a failure or disconnection in
the monitor, so contact your Komatsu distributor.
NOTICE
When performing checks before starting, do not relay only on the monitor.
Always perform all the items listed for the following checks and
maintenance.
3 - 70
.
OPERATION OPERATION
CHECK COOLANT LEVEL, ADD COOLANT
WARNING
Normally, do not open the radiator cap. When checking the cooling water level, check the sub-tank when the engine is cold.
Do not remove the cap when the radiator water is hot. Boiling water may spurt out. After the water temperature goes down, turn
the cap slowly to release the pressure, then remove it.
1. Open the engine side cover on the left side of the chassis, and
check that the coolant is between the FULL and LOW marks on
sub-tank (1). If the water level is low, add water to the FULL
level through the water filler port in sub-tank (1).
REMARK
The coolant may overflow from the sub-tank drain hose. This is no
problem. It occurs because too much coolant has been added.
2. After adding coolant, tighten the cap securely.
3. If the sub tank is empty, first check for leakage of water, then
remove main radiator cap (2) and sub radiator cap (3), and
check that the coolant water is above the bottom surface of the
strainer as shown in the diagram on the right. Add water if the
level is low.
4. After adding water, close the engine side cover.
3 - 71
.
OPERATION OPERATION
CHECK FUEL LEVEL, ADD FUEL
WARNING
When adding fuel, never let the fuel overflow. This may cause a fire. If the fuel is spilt, wipe it off completely.
1. Turn the starting switch to the ON position and check the fuel
level with fuel gauge (G) on the monitor panel.
After checking, turn the switch back to the OFF position.
2. After completing work, fill the fuel tank through fuel filler port
(F).
Check the fuel level with the fuel gauge at the fuel filler port.
3. After adding fuel, tighten the cap securely.
Fuel capacity: 840 liters (221.93 US gal)
REMARK
When dozing on a grade, make sure there is plenty of fuel in the
tank so that the engine fuel line does not become aerated.
If breather hole (1) on the cap is clogged, the pressure in the
tank will drop and fuel will not flow.
Clean the hole from time to time.
3 - 72
.
OPERATION OPERATION
CHECK WATER SEPARATOR, DRAIN WATER AND SEDIMENT

(Machines equipped with additional fuel filter cartridge)
1. Open the side cover on the left side of the machine.

The water separator forms one unit with the additional fuel filter
and is installed at the bottom.
2. It is possible to judge the water level and amount of sediment
by looking through transparent cap (2). If there is any water or
sediment collected at the bottom, set a container to catch the
drain water under drain hose (3).
3. Loosen plug (1) and drain the water.
4. When fuel comes out from drain hose (3), tighten plug (1)
immediately.
Tightening torque: 0.2 to 0.45 N·m (0.02 to 0.046 kgf·m, 0.1 to
0.3 lbft)
3 - 73
.
OPERATION OPERATION
CHECK OIL LEVEL IN ENGINE OIL PAN, ADD OIL
WARNING
Parts and oil are at high temperature immediately after the engine is stopped and may cause serious burns. Wait for the oil
temperature to go down before performing this operation.
1. Open the engine side cover on the left side of the chassis.
2. Remove dipstick (G), and wipe the oil off with a cloth.
3. Fully insert dipstick (G) into filler pipe (F), then remove it.
4. The oil level should be between the H and L marks on dipstick

(G).
If the oil level is below the L mark, add engine oil through oil
filler (F).
5. If the oil is above the H mark, remove drain plug (1), loosen
drain valve (2) to drain the excess oil, then check the oil level
again.
6. If the oil level is correct, tighten the oil filler cap securely and
close the engine side cover.
REMARK
When checking the oil level after the engine has been operated, wait for at least 15 minutes after stopping the
engine before checking.
If the machine is at an angle make it horizontal before checking.
When adding oil, remove the dipstick form the holder to release the air inside the crankcase.
The dipstick is marked with the levels for ENGINE STOPPED on one side and ENGINE IDLING on the other
side.
It is also possible to check the oil level with the engine idling, but be sure to remember the following points.
Check oil when the engine coolant temperature gauge is within the green range.
Read the dipstick on its reverse side marked with "ENGINE IDLING".
3 - 74
.
OPERATION OPERATION
CHECK OIL LEVEL IN POWER TRAIN CASE, ADD OIL

1. Remove dipstick (G), and wipe the oil off with a cloth.
3. Check that the oil level is between the H and L marks on
dipstick (G).
If the oil level is below the L mark, add engine oil through oil
filler (F).
The dipstick has two sides for checking the oil level: COLD
STOP for use when the engine is stopped and the oil
temperature is low; and HOT IDLE for use when the engine is
idling and the oil temperature is high.
REMARK
When checking the oil level with the engine stopped before
starting operations, check the oil level with the side marked COLD
STOP. It is also possible to check the oil level even after starting
operations when the power train oil temperature is high,
but in this case, run the engine at idling and use the side marked
HOT IDLE.
4. If the oil is above the H line, remove drain cover (1) at the left
side at the bottom surface of the power train case, pull out drain
hose (2) from the take-out port, loosen drain plug (3), drain the
excess oil, then check the oil level again.
5. If the oil level is correct, tighten the oil filter cap securely.
REMARK
When inspecting, if the machine is at an angle, move it to a
horizontal place to carry out the check.
3 - 75
.
OPERATION OPERATION
CHECK BRAKE PEDAL TRAVEL

Drive the machine, depress the brake pedal, and check that the machine stops.
CHECK DUST INDICATOR

1. Check that the yellow piston inside the red zone on the outside
diameter of dust indicator (1) is not overlapping.
2. If the yellow piston is overlapping the red zone, clean or
replace the element immediately.
For details of the method of cleaning the element, see
"CHECK, CLEAN AND REPLACE AIR CLEANER ELEMENT
(PAGE 4-24)".
3. After checking, cleaning, and replacing, press the knob of dust

indicator (1) to return the yellow piston to its original position.
In environments where the rubber deteriorates quickly or the
surface becomes damaged (in direct sunlight, dusty areas,
etc.), replace before it becomes dirty and it becomes difficult
to judge the condition.
3 - 76
.
OPERATION OPERATION
CHECK OIL LEVEL IN HYDRAULIC TANK, ADD OIL
WARNING
When removing the oil filler cap, oil may spurt out, so stop the engine
and wait for the oil temperature to go down, then turn the cap slowly to
release the internal pressure before removing the cap.
If oil has been added to above the H mark, stop the engine and wait for
the hydraulic oil to cool down. Then remove drain plug (P), loosen drain
valve (1), and drain the excess oil.
1. Lower blade to the ground and stop the engine. Wait for 5
minutes before checking oil level. Oil level should be between
the H and L in sight gauge (G).
NOTICE
If the oil level is above the H line, do not add oil. Doing so may lead to
damage to the oil pressure circuit and spouting out of oil.
2. If the level is below the L mark, add engine oil through oil filler
(F).
REMARK
When inspecting, if the machine is at an angle, move it to a
horizontal place to carry out the check.
3 - 77
.
OPERATION OPERATION
CHECK ELECTRIC WIRING
WARNING
If fuses are frequently blown or if there is a short circuit in the electrical wiring, locate the cause and repair or contact your
Komatsu distributor.
Accumulation of flammable material (dead leaves, twigs, grass, etc.) around the battery may cause fire, so always check and
remove such material.
Keep the top surface of the battery clean and check the breather hole in the battery cap. If it is clogged with dirt or dust, wash
the battery cap to clear the breather hole.
Check for damage to the fuse, that a fuse of the specified capacity is being used, that there are no signs of any
disconnection, breakage, or short circuit in the wiring. Also check for loose terminals, and tighten any loose
terminals found.
Be sure to check wiring for the battery, starting motor, and alternator.
In addition, if any flammable material is accumulated around the battery, remove it.
For troubleshooting and repairs, contact your Komatsu distributor.
CHECK THAT LAMPS LIGHT UP

1. Turn starting switch key to the ON position.
2. Turn the front lamp and working lamp switch to the ON (b)
position, make sure the lamps light up.
3. Turn the rear lamp switch to the ON (b) position, make sure the
lamps on the left and right fenders light.
If the lamps do not light, check for a broken bulb or disconected
wire, contact your Komatsu distributor for repairs.
3 - 78
.
OPERATION OPERATION
CHECK HORN SOUND

1. Turn starting switch key to the ON position.
2. Push the horn switch and check that the horn sounds.
CHECK BACKUP ALARM SOUND

1. After starting the engine, run it at idle, completely depress the
brake, and release the parking lever.
2. While depressing the brake pedal, set joystick to the

REVERSE position. The buzzer must sound immediately.
Buzzer will continue to sound until the joystick is moved to
NEUTRAL or FORWARD position.
3. As soon as it is confirmed that the buzzer is working properly,
set the joystick to the NEUTRAL position, put the parking lever
to the LOCK position, and then release the brake pedal.
3 - 79
.
OPERATION OPERATION
ADJUSTMENT
ADJUSTING OPERATOR'S SEAT
WARNING
Adjust the seat position at the beginning of each shift or when operators change.
Adjust seat so the brake pedal can be completely depressed with the operator's back against the backrest.
(A) Fore-and-aft adjustment

Pull lever (1), set the seat to a position where it is easy to operate,
then release the lever.
Fore-aft adjustment: 200 mm (7.9 in) (10 stages)
(B) Weight and height adjustment of seat

Turn knob (2) under the seat so that weight adjustment indicator
(3) displays the green range. The height can be adjusted by
turning the knob (2) while the green range is displayed.
Turn the knob clockwise to raise the seat and turn the knob
counterclockwise to lower the seat.
Height adjustment range: stepless, 75 mm (3 in)
Weight adjustment range: 50 to 130 kg (110 to 237 lb)
(C) Adjust reclining angle
REMARK
When the seat is pushed forward, the available reclining angle becomes greater; when the seat is pushed back, the
available reclining angle becomes smaller. When moving the seat back, return the seat back to its original position
before moving the seat.
Pull up lever (4), set the seatback to a position where it is easy to operate, then release the lever.
(D) Adjusting direction of seat

Pull up lever (5) to unlock the seat, and the seat can be turned by
hand to the position of 15° on the right.
After changing the direction of the seat, return the lever securely to
lock the seat.
Change the direction of the seat to the right for the ease of
operation of the ripper.
REMARK
If the direction of the seat is changed, the steering, directional, and
gearshift lever is also interconnected and changes direction.
3 - 80
.
OPERATION OPERATION
USING SEAT BELT

When operating a machine equipped with ROPS, be sure to use the seat belt.
WARNING
Before fastening the seat belt, inspect the securing brackets and belt for abnormal conditions.
Replace any worn or damaged seat belt or the securing brackets.
Even if no abnormality can be seen in the belt, replace the seat belt every 3 years. The date of manufacture of the belt is shown
on the back of the belt.
Adjust and fasten the seat belt before operating the machine.
Always use the seat belt when operating the machine.
Fit the seat belt across your lap without twisting.
FASTEN THE BELT AND REMOVE IT

1. Sit on the seat, depress the brake pedal fully, and adjust the
seat so that your back is pressed against the backrest.
2. After adjusting the seat position, adjust tether belt (1). Tense
the tether belt and install it when there is no one sitting on the
seat.
3. Sit on the seat and hold tongue (4) connected to wind-in
mechanism (2) and pull out the belt slowly so that the belt will
cover your abdomen sufficiently.
4. Insert tongue (4) in buckle (3) until it clicks. The belt is pulled
back into wind-in mechanism (2) until it is fitted to your
abdomen. The belt is locked under this condition and cannot
be extended anymore. Fit the belt to your abdomen without
twisting it.
REMARK
If the belt is locked before the tongue is inserted in the buckle, let
it return to the wind-in mechanism, then repeat the above
procedure from the start.
5. Pull the belt to check that it is securely locked in position.

6. When removing the belt, press the red button on buckle (3).
The belt will automatically be wound in.
Check the seat belt mounting bolts and re-tighten if necessary.
Tightening torque: 24.5 ± 4.9 N·m (2.5 ± 0.5 kgf·m, 18.1 ± 3.6 lbft)
If the seat belt is scratched or frayed, if any fittings are broken or deformed from long service, replace the seat belt
immediately.
3 - 81
.
OPERATION OPERATION
ADJUST MIRROR
Loosen nut (1) of the mirror and adjust the mirror to a position
where it gives the best view from the operator's seat.
In particular, be sure to adjust the mirror so that people at the rear
left or right of the machine can be seen clearly.
ADJUST JOYSTICK (PCCS LEVER)
WARNING
After moving case (2) in order to adjust the position of the steering, directional, and gearshift lever, secure lock lever (1) into the
notched hole. Making sure it is in the LOCK position. If it is not completely locked, the steering, directional, and gearshift lever may
unexpectedly move and cause damage, serious injury, or death.
The steering, directional, and speed lever (wrist control type single lever: joystick) can be adjusted by 100 mm (3.9
in) in 5 stages to the front or rear. Adjust to the most suitable position to match the adjustment of the operator's seat.
1. Pull up lock lever (1) to the FREE position at the rear of case
(2) on left side of the operator's compartment.
2. With lock lever (1) pulled up, use your other hand to grip the
front of case (2), then move it forward with your left and right
hands. The joystick moves with case (2).
3. Move case (2) to the desired position until a click is heard.
Then pull up lock lever (1) and release it. Lock lever (1)
automatically returns to the LOCK position.
REMARK
PCCS: Palm command control system
3 - 82
.
OPERATION OPERATION
ADJUST ARMREST
The height of the armrest on the left and right sides of the operator's seat can be adjusted to 3 positions. After
adjusting the operator's seat, adjust the armrest to a suitable height.
ADJUST ARMREST (RIGHT)

Armrest (1) on the right side of the operator's cab part can be adjusted up 30 mm (1.2 in) or down 30 mm (1.2 in)
based on the standard height (center) in three stages.
1. Loosen knob (2) (2 places).
2. Move the armrest on the operator's seat to the front, then align
the position of the 3 holes (high, middle, low).
3. Tighten knob (2) securely.
3 - 83
.
OPERATION OPERATION
ADJUST ARMREST (LEFT)

The armrest on the left side of the operator's compartment can be adjusted to 2 heights.
1. When adjusting height of both armrest and case

It is possible to effortlessly adjust the standard height up 50
mm (2 in) or down 50 mm (2 in).
The steering, directional, and gearshift lever moves as a unit.
Turn up/down left adjustment knob (1) to adjust the height.
Turn the knob to adjust as follows.
Turn CLOCKWISE to move UP
Turn COUNTERCLOCKWISE to move DOWN
2. When adjusting height of armrest only

It is possible to effortlessly adjust up to 36 mm (1.4 in) upward
from the armrest and case contact surface.
The steering, directional, and gearshift lever does not move.
Open the armrest, and turn knob (2) counterclockwise to adjust

the height.
Only the armrest will move up. After adjusting it to the desired
height, close the armrest.
3 - 84
.
OPERATION OPERATION
OPERATIONS AND CHECKS BEFORE STARTING ENGINE

WARNING
When starting the engine, check and make sure the work equipment
lock lever (4) and parking lever (1) are secured at the LOCK position.
If the control levers are not locked and they are touched by accident
when starting the engine, the work equipment may move unexpectedly,
and this may lead to a serious injury or death.
When standing up from the operator's seat, always set the work
equipment lock lever (4) and parking lever (1) to the LOCK position,
regardless of whether the engine is running or stopped.
1. Check that parking lever (1) is locked. If this lever is not at the
LOCK position, the engine will not start.
2. Check that joystick (2) is at the N (neutral) position.
REMARK
The engine cannot be started if joystick (steering, directional, and gearshift lever) (2) is not at the N position.
If joystick (steering, directional, and gearshift lever) (2) is at F or R, the letter P on display panel A will flash.
3 - 85
.
OPERATION OPERATION
3. Check that the blade is lowered to the ground and that blade
control lever (3) is at the HOLD position. If it is at the FLOAT
position, the engine will not start.
4. Check that the ripper is lowered to the ground.

5. Check that work equipment lock lever (4) is locked.
If work equipment lock lever (4) is locked, the blade control
lever is returned to the HOLD position even if it is at the FLOAT
position.
3 - 86
.
OPERATION OPERATION
STARTING ENGINE
NORMAL STARTING
WARNING
Check that there are no persons or obstacles in the surrounding area,
then sound the horn and start the engine.
Never use starting aid fluids as they may cause explosions.
Exhaust gas is toxic. When starting the engine in confined spaces, be
particularly careful to ensure good ventilation.
NOTICE
Do not crank the starting motor continuously for more than 20 seconds.
If the engine does not start, wait for at least 2 minutes, then repeat the
procedure from Step 2.
Before starting the engine, check that the fuel control dial is at the low
idling (MIN) position.
On this machine, to protect the turbocharger, a turbo protect function is
provided. In cold weather, even if fuel control dial (1) is operated
immediately after starting the engine, the engine speed may not change
for several seconds.
If the fuel control dial is at the FULL position, the engine will accelerate
suddenly and cause damage to the engine parts, so set it to an
intermediate or low speed position.
1. Turn fuel control dial (1) to the center position between MIN
and MAX position.
2. Turn the key of starting switch (2) to the ON position.
3 - 87
.
OPERATION OPERATION
3. Check that engine pre-heating pilot lamp (3) on the monitor

panel lights up.
4. Maintain the key in the on position until the pre-heating pilot

lamp (3) goes off.
5. When pre-heating pilot lamp (3) goes off, turn the key of
starting switch (2) to the START position to crank the engine.
The time that pre-heating pilot lamp (3) stays on changes
according to the ambient temperature as shown in the table
below.
Ambient temperature Pre-heat time

-5°C to -10°C (23°F to 14°F) 20 to 27 seconds
-10°C to -20°C (14°F to -4°F) 27 to 40 seconds
-20°C to -30°C (-4°F to -22°F) 40 seconds
6. When the engine starts, release the key in starting switch (2).
The key will return automatically to the ON position.
3 - 88
.
OPERATION OPERATION
REMARK
Immediately after starting the engine, run at idle. While running the engine, release the decelerator pedal and do
not operate the work equipment.
Guideline for idle time
Cold weather: At least 15 seconds
1st start after changing engine oil or engine oil filter: 20 seconds
7. When the engine rotation stabilizes, return to the low idle (MIN) position of fuel control dial (1) and then carry out
the warming-up operation.
REMARK
Regardless of the ambient temperature, if the key in starting switch (2) is turned from OFF position to left,
preheating pilot lamp (3) will light up and preheating will start. (Preheating continues while the starting switch is
held at the left.)
For the details of the preheating time, see the table in Step 5.
While preheating is being carried out, the preheating pilot lamp (3) lights up to show that preheating is being
carried out. After it lights up for 36 seconds, it flashes for 16 seconds and goes out. When it goes out, complete
the preheating immediately.
If the engine does not start with the above operation, wait for about 2 minutes, and repeat steps from Step 3. And
4.
The relationship between the actuation time of the turbo protect function and the engine cooling water
temperature is as follows.
Even if the fuel control dial is operated within the time given below, the engine speed will not change.
REMARK
The actuation time for the turbo protect function and the relationship with the engine coolant temperature are as
shown below.
If the fuel control dial is operated within the time shown below, the engine speed will not change.
Coolant temperature Turbo protect time (sec.)

Above 10°C (50°F) 0
10 to -10°C (50 to 14°F) Change 0 to 5
below -10°C (14°F) 5
In cold weather, the turbo protect function is actuated, so the engine speed is kept at 1000 rpm or below for
several seconds. After that, it becomes the speed set by the position of the fuel control dial.
3 - 89
.
OPERATION OPERATION
OPERATIONS AND CHECKS AFTER STARTING ENGINE

WARNING
If there has been any abnormal actuation or trouble, turn the starting switch key to the OFF position.
If the work equipment is operated without sufficiently warming up the machine, the response of the work equipment to the
movement of the control levers will be slow and may not move as the operator desires. Always warm the machine to full
operating temperature, particulary in cold areas.
BREAKING IN THE MACHINE

CAUTION
Your Komatsu machine has been thoroughly adjusted and tested before shipment. However, operating the machine under severe
conditions at the beginning can adversely affect the performance and shorten the machine life.
Be sure to break-in the machine for the initial 100 hours (as indicated by the service meter).
During break-in operations, follow the precautions described in this manual.
Run the engine at idling for 15 seconds after starting it. During this time, do not operate the control levers or fuel
control dial.
Idle the engine for 5 minutes after starting it up.
Avoid operation with heavy loads or at high speeds.
Immediately after starting the engine, avoid sudden starts, sudden acceleration, unnecessary sudden stops, and
sudden changes in direction.
WARMING UP OPERATIONS
NOTICE
Do not perform operations or suddenly operate the levers when the
hydraulic oil is at a low temperature. Always perform the warming-up
operation until the hydraulic oil temperature monitor displays the green
range. This will help extend the machine life.
Do not suddenly accelerate the engine before the machine reaches full
operating temperature.
Do not run the engine at low or high idle for more than 20 minutes. This
will cause oil leaks from the turbocharger oil supply piping.
If it is necessary to run the engine at idling, apply a load from time to
time or run the engine at a mid-range speed.
If engine oil pressure caution lamp (3) flashes or the buzzer sounds
intermittently, stop the engine and check for the cause.
3 - 90
.
OPERATION OPERATION
1. Turn fuel control dial (1) to the center position between low
idling (MIN) and high idling (MAX) positions and run the engine
at a mid-range speed for 5 minutes under no load.
2. After warm-up run is completed, check gauges and caution
lamps for proper operation. If any abnormality is found, repair
it.
Continue to run the engine under a light load until engine
coolant temperature gauge indicator (2) is within the green
range (B).
(A): White range
(B): Green range
(C): Red range
3. Check for abnormal exhaust gas color, noise, or vibration. If any abnormality is found, contact your Komatsu
distributor.
3 - 91
.
OPERATION OPERATION
IN COLD AREAS
1. Turn fuel control dial (1) to the center position between low
idling (MIN) and high idling (MAX) positions and run the engine
at a mid-range speed for 10 minutes under no load.
2. Operate blade control lever (4) to the RAISE position, then

keep the blade raised to the maximum height and continue to
relieve the circuit for 10 minutes.
3. Finally, operate blade control lever (4) and ripper control lever
to operate the blade and ripper cylinders several times.
If the oil temperature in the work equipment is not properly
raised, there will be a time lag in the response of the work
equipment and steering.
4. After warm-up run is completed, check gauges and caution
lamps for proper operation. If any abnormality is found, repair
it.
Continue to run the engine under a light load until engine
coolant temperature gauge indicator (2) is within the green
range (B).
(A): White range
(B): Green range
(C): Red range
REMARK
If the power train oil temperature is not raised sufficiently, it will take
longer to accelerate to the maximum speed.
5. Check for abnormal exhaust gas color, noise, or vibration. If any abnormality is found, contact your Komatsu
distributor.
3 - 92
.
OPERATION OPERATION
STOPPING ENGINE
NOTICE
If the engine is abruptly stopped before it has cooled down, engine life may
be drastically shortened. Do not abruptly stop the engine except for an
emergency.
If the engine has overheated, do not stop it abruptly, run it at medium
speed allowing the engine to gradually cool down, then stop it.
1. Turn fuel control dial (1) in the low idling (MIN) positions and
run the engine at low idling speed for 5 minutes to allow the
engine to gradually cool down.
2. Turn the key in starting switch (2) to the OFF position.

The engine will stop.
3. Remove the key from starting switch (2).
CHECK AFTER STOPPING ENGINE

1. Walk around the machine and check the work equipment, machine exterior, and undercarriage, also check for
any leakage of oil or coolant. If any problem are found, repair them.
2. Fill the fuel tank.
3. Check the engine compartment for paper and debris. Clean out any paper and debris to avoid a fire hazard.
4. Remove any mud affixed to the undercarriage.
3 - 93
.
OPERATION OPERATION
MOVING MACHINE OFF

WARNING
Before moving the machine, check that the area around the machine is
safe, and always sound the horn before moving.
Do not allow anyone to enter the area around the machine.
The rear of the machine is a blind spot, so be extremely careful when
traveling in reverse.
When moving the machine down a slope, always keep brake pedal (8)
depressed, even after releasing parking lever (1).
When moving the machine up a steep slope, turn fuel control dial (5) to
high idling (MAX) position and run the engine at full speed, and keep
brake pedal (8) and deceleration pedal (6) depressed. Then operate
steering, directional, and gearshift lever (4) from the N (neutral) position
to the direction of travel and slowly release brake pedal (8). When the
travel speed rises, slowly release deceleration pedal (6).
1. Set parking lever (1) to the FREE position
2. Set work equipment lock lever (2) for blade control lever (3)
and ripper control lever (4) to the FREE position.
3 - 94
.
OPERATION OPERATION
3. Operate blade control lever (3) and ripper control lever (4) to
the RAISE position, raise the blade 40 - 50 cm (15.8 - 19.7 in)
from the ground, and raise the ripper to the maximum height.
4. Turn fuel control dial (5) to the full speed (MAX) position, raise
the engine speed, and fully depress decelerator pedal (6).
5. Move joystick to the F (FORWARD) or R (REVERSE) position,

gradually release decelerator pedal (6) and allow the machine.
3 - 95
.
OPERATION OPERATION
STOPPING MACHINE
WARNING
Avoid stopping suddenly. Give yourself ample room when stopping.
When stopping the machine, select flat hard ground and avoid
dangerous places. If it is unavoidably necessary to park the machine on
a slope, place the parking lever (1) in the LOCK position and insert
blocks underneath the track shoes. As an additional safety measure,
thrust the blade into the ground.
If the work equipment control lever is touched by accident, the work
equipment may suddenly move, and may cause damage, serious injury,
or death. Before leaving the operator's seat, always secure work
equipment lock lever (2) at the LOCK position.
1. Depress brake pedal (3) to apply the brake.
NOTICE
If the brake is depressed when the engine speed or travel speed is high, the
brake disc may make a slipping sound. Normally, depress decelerator
pedal (4) to reduce the engine speed and travel speed before depressing
the brake.
2. Set joystick (5) at the neutral position.
3 - 96
.
OPERATION OPERATION
SHIFTING GEAR
The machine does not have to be stopped to shift gears.
1. Move steering, forward-reverse, gear shift lever (1) to the
desired gear position to shift gears.
GEAR SHIFTING
When the joystick is at the FORWARD or REVERSE position
and switch (a) or switch (b) is pushed, the transmission speed
will change.
UP switch (a): Each time the switch is pressed, the transmission
will shift up one speed.
DOWN switch (b): Each time the switch is pressed, the
transmission will shift down one speed.
When the lever is operated forward (to set to FORWARD) from the N position, the transmission shifts to F1.
If the UP switch is pressed once when the transmission is in F1, the transmission shifts to F2.
If the UP switch is pressed once when the transmission is in F2, the transmission shifts to F3.
If the DOWN switch is pressed once when the transmission is in F3, the transmission shifts to F2.
If the DOWN switch is pressed once when the transmission is in F2, the transmission shifts to F1.
When the lever is operated rear (to set to REVERSE) from the N position, the transmission shifts to F1.
If the UP switch is pressed once when the transmission is in R1, the transmission shifts to R2.
If the UP switch is pressed once when the transmission is in R2, the transmission shifts to R3.
If the DOWN switch is pressed once when the transmission is in R3, the transmission shifts to R2.
If the DOWN switch is pressed once when the transmission is in R2, the transmission shifts to R1,
For details of the maximum speed in each speed range, see "SPECIFICATIONS (PAGE 5-2)".
REMARK
The speed range in use is displayed on the panel display according
to the gearshift operation.
For example:
Neutral: N1 is displayed on the display panel A (2)
FORWARD 2nd: F2 is displayed on the display panel A (2)
REVERSE 3rd: R3 is displayed on the display panel A (2)
When the parking lever is locked, P is displayed.
3 - 97
.
OPERATION OPERATION
GEARSHIFTING USING SHIFT MODE SELECTION

Shift mode selection means that the selected speed range is displayed at the N position before starting.
When the joystick is at the N position, if UP switch (a) or DOWN
switch (b) is pressed, the shift mode selection can be carried
out.
The selected shift mode is displayed on display panel B

(multi-information) of the monitor panel.
In [F1 - R1] shift mode (initial setting is completed)
Lamps (c) and (d) are OFF.
Lamp (c) is ON and lamp (d) is OFF.
Lamp (d) is ON and lamp (c) is OFF.
Shift operation when [F1-R2] shift mode is set

When the joystick is at the N position and the UP switch is pressed once, the transmission is set to the [F1-R2]
mode and lamp (c) lights up. Following this, if the joystick is operated forward (to set to FORWARD), the speed
range is set to F1. If the lever is operated to the rear (to set to REVERSE), the speed range is automatically
switched R1 → R2.
Shift operation when [F2-R2] shift mode is set

When the joystick is at the N position and the UP switch is pressed twice, the transmission is set to the [F2-R2]
mode and lamp (d) lights up. Following this, if the joystick is operated forward (to set to FORWARD), the speed
range is set to F1 → F2. If the lever is operated to the rear (to set to REVERSE), the speed range is automatically
switched R1 → R2.
REMARK
Even when the transmission is set to [F1-R1] mode, [F1-R2] mode, or [F2-R2] mode, if the UP switch or DOWN
switch is operated, this will be given priority and manual operation can be carried out.
For example:
After the [F1-R2] mode has been set, if the joystick is operated forward (to set to FORWARD), the speed range is
set to F1. However, if the lever is kept operated forward and UP switch (a) is pressed once, the speed
range will shift to F2; if the UP switch is pressed twice, the speed range will shift to F3. When the transmission is
in F3 and DOWN switch (b) is pressed once, the speed range will shift to F2; if the DOWN switch is pressed twice,
the speed range will shift to F1.
On the other hand, if the joystick is operated to the rear (to set to REVERSE), the speed range is automatically
switched R1 → R2. However, if the lever is kept operated to the rear and UP switch (a) is pressed once,
the speed range will shift to R3; if the DOWN switch (b) is pressed once, the speed range will shift to R1.
However, the setting stays in the [F1-R2] mode. If the steering, directional, and gearshift lever is returned to N and
then operated forward (to set to FORWARD), the speed range is set to F1; if the lever is operated to the rear (to set
to REVERSE), the speed range is automatically switched R1 → R2.
3 - 98
.
OPERATION OPERATION
REMARK
The default setting is [F1 - R1].
After the starting switch is turned OFF, the shift mode returns to the default setting [F1 - R1].
AUTO SHIFT DOWN OPERATION

If the travel speed drops due to the load conditions when traveling,
the transmission is automatically shifted to a lower speed range.
This is actuated by turning auto shift down switch (2) on the
instrument panel at the front of the operator's compartment to the
ON (b) position.
OFF position (a): Automatically canceled

ON position (b): Automatically shifted down to lower speed range
The transmission is automatically shifted down F2→ F1, F3 →

F2, R2 → R1, R3 → R2.
REMARK
For safety reasons, during auto shift down, the transmission is
prevented from shifting up.
If it is desired to shift up, use manual control and press the UP

button on the steering, directional, and gearshift lever.
3 - 99
.
OPERATION OPERATION
SHIFTING BETWEEN FORWARD AND REVERSE

WARNING
When switching between FORWARD and REVERSE, check first that the
direction of travel is safe.
CAUTION
There is no need to stop the machine even when switching between
FORWARD and REVERSE.
To increase safety, operator comfort, and the life of the transmission, leave
the engine running at full speed, and always depress the decelerator pedal
to lower the engine speed.
1. Depress decelerator pedal (1) to reduce the engine speed.
2. Move joystick (2) to the neutral position, reduce the speed,

then depress brake pedal (3) and stop the machine.
3. After depressing decelerator pedal (1), move steering,

forward-reverse, gear shift lever (2) to the desired position.
3 - 100
.
OPERATION OPERATION
4. Release decelerator pedal (1) and raise the engine speed.
REMARK
When the joystick is placed in REVERSE, the backup alarm will
sound.
3 - 101
.
OPERATION OPERATION
STEERING MACHINE
WARNING
Avoid as much as possible turning the machine on a slope.
The machine will tend to slip sideways. Particular care should be taken on soft or clay land.
Never make a pivot turn at high speed.
NORMAL TURNING
To turn the machine while traveling, incline steering,
forward-reverse, gear shift lever (1) in the direction to turn.
TURNING GRADUALLY TO LEFT WHILE TRAVELING FORWARD

If the joystick is pushed forward and moved partially to the left (L),
the steering clutch is disengaged and the machine turns gradually
to the left.
When turning gradually to the right, push the joystick forward, and
move it partially to the right.
Do the same when traveling in reverse.
3 - 102
.
OPERATION OPERATION
MAKING SHARP TURNS TO LEFT WHILE TRAVELING FORWARD

When the pivot turn mode switch is turned ON, pivot turns can be
carried out in F1, R1, F2, or R2.
If the joystick is pushed forward and moved fully to the left (L), the
steering clutch is disengaged, the brake is applied, and the
machine turns sharply to the left.
COUNTERROTATION TURNS TO LEFT WHEN TRAVELING FORWARD

NOTICE
When carrying out a counterrotation turn, if the load is not equal on the left
and right sides, the machine may carry out a pivot turn, so check the
ground conditions and be careful not to hit any obstacles.
With steering, forward-reverse, gear shift lever (1) in the N

position, operate the lever partially to the left (L). The left and right
tracks will rotate in opposite directions, and the machine will make
a slow counterrotation turn. If the lever is moved further, the speed
of the counterrotation turn will increase.
REMARK
When making a right counterrotation turn, move the steering,
forward-reverse, gear shift lever (1) to the right (R) in the same
way.
3 - 103
.
OPERATION OPERATION
TURNING WHILE DESCENDING A SLOPE

With machines that can carry out counter rotation turns, on steep downhill slopes where the machine may travel
under its own weight, or on downhill slopes where it is being pushed by a towed machine, the machine will not steer
in the opposite direction, so do as follows.
REMARK
Cross steering means the phenomenon that the machine turns in the opposite direction to the actual steering
direction.
TURNING GRADUALLY TO LEFT WHILE TRAVELING FORWARD

If the joystick (1) is pushed forward and moved partially to the left
(L), the machine turns gradually to the left.
REMARK
When making gradual turns to the right, push the joystick (1)
forward, and move it partially to the right.
Do the same when traveling in reverse.
3 - 104
.
OPERATION OPERATION
PRECAUTIONS FOR OPERATION
PAY ATTENTION TO GAUGES

If the red range of the power train oil temperature gauge lights up during operation, reduce the load and wait for the
temperature to go down.
PERMISSIBLE WATER DEPTH

When operating in water, always keep top surface of the track
frame above the surface of the water.
Also, be careful that the engine cooling fan will not come in contact
with water. The fan can be damaged.
PRECAUTIONS WHEN TRAVELING UP OR DOWN HILLS
METHOD OF USING DECELERATOR PEDAL

When stepping on the decelerator pedal while going uphill, climbing ability will be reduced and the machine will stop.
Furthermore, the engine may stall.
USE ENGINE AS BRAKE

When going downhill, move steering, forward-reverse, gear shift lever into low speed to run engine at slow speed
and travel down slope using the engine as a brake.
Do not move the steering, forward-reverse, gear shift lever to the NEUTRAL position.
When traveling down hills of more than 15°, shift down to 1st speed (R1 or F2).
BRAKING WHEN TRAVELING DOWNHILL

While descending a slope using the engine as a brake, also apply the brakes.
Failure to brake may result in overrunning, causing engine trouble.
3 - 105
.
OPERATION OPERATION
PRECAUTIONS ON SLOPE
BE CAREFUL OF FUEL LEVEL

If the fuel level in the fuel tank becomes low when working on slopes, the engine may suck in air because of the angle
of the machine or the swaying of the machine. If this makes the engine stop, the braking effect will be reduced, so
be careful not to let the fuel level in the fuel tank become too low.
BE CAREFUL OF OIL LEVEL

When operating machine on sloped areas of more than 20°, fill all appropriate components with oil to H level.
PRECAUTIONS WHEN ENGINE STOPS ON SLOPE

If the engine stops while working or traveling on a hill, immediately depress the brake pedal to bring the machine to
a complete stop.
METHOD OF USING BRAKES

The following actions cause premature damage to the brakes, so avoid such operations.
Using emergency brake at full speed
Using brake with engine running at full speed in first gear (F1, R1) (Machine stall condition)
REMARK
Always depress the decelerator pedal to lower the engine speed before actuating the brakes.
PROHIBITED TO KEEP THE DOOR OPEN DURING OPERATIONS

Always keep the door closed when traveling or carrying out operations.
If the door is open, there is danger of damage from obstacles or strong vibration.
IT IS PROHIBITED TO MODIFY THE CAB GLASS IN ANY WAY THAT WILL OBSTRUCT THE VIEW
For safety reasons, do not install anything to the cab glass that will obstruct the view.
Always keep the glass clean to ensure safety during operations.
PRECAUTIONS FOR BLIND SPOTS CAUSED BY CAB STAY AND ROPS STAY
WARNING
The cab stay and ROPS stay cause blind spots.
When operating, always be sure to check carefully that there is no obstacle
or worker in the surrounding area.
3 - 106
.
OPERATION OPERATION
PARKING MACHINE
WARNING
Avoid stopping suddenly. Give yourself ample room when stopping.
When stopping the machine, select flat hard ground and avoid
dangerous places. If it is unavoidably necessary to park the machine on
a slope, place the parking lever (4) in the LOCK position and insert
blocks underneath the track shoes. As an additional safety measure,
thrust the blade into the ground.
If the work equipment control lever is touched by accident, the work
equipment may suddenly move, and may cause damage, serious injury,
or death. Before leaving the operator's seat, always secure work
equipment lock lever (7) at the LOCK position.
1. Depress brake pedal (1) to stop the machine.
NOTICE
If the brake is depressed when the engine speed or travel speed is high, the
brake disc may make a slipping sound. Normally, depress decelerator
pedal (2) to reduce the engine speed and travel speed before depressing
the brake.
2. Place joystick (3) at the neutral position and set the speed
range to 1st.
3 - 107
.
OPERATION OPERATION
3. Operate parking lever (4) to lock the brakes.
4. Operate blade control lever (5) and ripper control lever (6) to
the LOWER position, and lower the blade and ripper to the
ground.
5. Set blade control lever (5) and ripper control lever (6) to the
HOLD position.
6. Set work equipment lock lever (7) for blade control lever (5)
and ripper control lever (6) to the FREE position.
3 - 108
.
OPERATION OPERATION
CHECK AFTER FINISHING WORK

Use the meters and caution lamps to check the engine coolant
temperature, engine oil pressure, fuel, and power train oil
temperature.
LOCKING
To prevent vandalism, there are locks at the following places.
Places that can be locked with the starting switch key.
Right and left engine side cover (1)
(left side: 2 places, right side: 2 places)
Electrical component bow inspection cover (left)(2)
Cab door opener (3)
Lock-type caps (4) (if equipped)
Radiator cap
Fuel tank cap
Hydraulic tank cap
Power train oil filler pipe cap
Battery inspection cover(5), (6)
Tool box inspection cover (2)
Commercially available locks can be fitted to the following places.
Battery inspection cover(5), (6)
Tool box inspection cover (2)
3 - 109
.
OPERATION OPERATION
WORK POSSIBLE USING BULLDOZER

In addition to the following, it is possible to further increase the range of applications by using various attachments.
DOZING
A bulldozer digs and transports dirt in a forward direction slope
excavation can always be most effectively carried out by
proceeding from the top downward.
With the dual tiltdozer, the angle of the blade cutting edge can be
changed, so the angle of the cutting edge can be adjusted during
the digging operation to improve the efficiency of the work.
CUTTING INTO HARD OR FROZEN GROUND OR DITCHING

For digging and ditch excavation of hard or frozen ground tilt the
blade. Even hard ground can be dug effectively by a tilted or angled
blade.
If the ground is harder, use a ripper attachment for better efficiency.
FELLING TREES, REMOVING STUMPS

NOTICE
Do not up root trees or stumps or fell trees by angling or tilting the blade.
For trees with a diameter of 10 to 30 cm (3.9 to 11.8 in), raise the

blade high and push 2 or 3 times to fell the tree.
Next, travel in reverse, and dig the corner of the blade into the
ground to cut and dig up the roots.
When doing this, never hit the tree at high speed or apply shock to
fell the tree.
3 - 110
.
OPERATION OPERATION
PUSHER OPERATIONS
When carrying out pusher operations, always install a pusher
plate.
When approaching the other machine, depress the decelerator
pedal to reduce the engine speed and approach slowly. After
coming into contact, raise the travel speed slowly and push with
full power.
If the pivot turns switch is kept at the ON position, it is possible
to carry out pivot turns, and this improves the ease of pusher
operation.
SMOOTHING
NOTICE
Avoid smoothing on rocky or stony ground. It can damage the blade.
When finishing the ground surface to a smooth finish after digging

or filling operations, keep a full load of soil in the blade and operate
the blade up or down in small movements while traveling forward.
When leveling windrows or ruts left by the tracks, set the blade to
the FLOAT position, travel at low speed in reverse and drag the
blade over the ground surface.
3 - 111
.
OPERATION OPERATION
EFFECTIVE USE OF MODE SELECTION SYSTEM
(1) Lock up mode switch (3) Reverse slow mode selector switch
(2) Economy mode selector switch
Selecting the mode to match the type of work and quality of rock or soil makes it possible to carry out operations
effectively.
For the machine that is solely used for crushed rocks, it can be done that when the ignition switch is turned ON, all
mode switches are turned ON. Contact your Komatsu distributor for such modification of the switches.
When all the mode selection switches are off, the selection is suitable for conventional digging and dozing of
bedrock.
The condition when all the mode selection switches are off is called the standard mode.
It is impossible to use any combination of the lock-up mode and any other mode.
The economy mode, reverse slow mode, and shoe slip control mode can be used independently or in combination.
{: Possible to use ±: Compound use not possible
3 - 112
.
OPERATION OPERATION
SELECTION OF MODE
DOZING OPERATIONS
LOCK UP MODE
By using the lock up mode, the travel speed increases, the
operating efficiency is improved, and the fuel consumption is also
reduced.
Speed ranges that can be used: All speed ranges
Applicable operations: Dozing loose material (suitable for
long-distance hauling operations)
When the lock up mode is turned ON, direct drive or torque
converter drive are automatically selected according to the load.
(Example)
Slot dozing operations
Hillside dozing operations
REMARK
If dozing operations power carried out on a slope of an angle of
more than 15°, the lock up may easily be canceled, so
operations are easier to carry out in the standard mode.
For normal ripping operations, if the lock up mode is used, the
lock up will repeatedly switch between ON and OFF, so use the
standard mode.
Even with ripping operations, if the ground is extremely soft, the
lock up mode can be used.
3 - 113
.
OPERATION OPERATION
ECONOMY MODE
Using the economy mode makes it possible to reduce wasteful
shoe slippage and to reduce the fuel consumption.
Speed ranges that can be used: F1
Applicable operations: Hauling after ripping, dozing blasted
rock, smoothing
When the economy mode is turned ON, it is automatically set to [1].
Carry out dozing operations in this condition, then set to [2] and
carry out operations. From this test, select the matching that gives
power and low shoe slip ratio (frequency of deceleration
operation).
Mode [1] is set to approx. 90% of full power and mode [2] is set to
approx 70%.
(Example)
Fine leveling operations
Ripping and dozing operations
3 - 114
.
OPERATION OPERATION
REVERSE SLOW MODE

This reduces the travel speed when traveling in reverse, reduces
the frequency of operating the deceleration pedal, and improves
the riding comfort for the operator.
Speed ranges that can be used: R1, 2, 3
Applicable operations: Travelling on bedrock
Use this mode to reduce the travel speed when traveling in R1, R2,
or R3.
When the reverse slow mode is ON, the travel speed is set to
approx. 80% of the full travel speed.
Use this mode to reduce the travel speed when traveling in reverse
after ripping and dozing bedrock or when traveling in reverse after
dozing on steep slopes. The travel speed differs in each mode
according to whether it is used in combination with the economy
mode.
When traveling on bedrock, if it is felt that the travel speed when
traveling in reverse is too high, turn the reverse slow mode ON.
This will reduce the travel speed when traveling in reverse.
When traveling down slopes, if it is felt that the travel speed when
3 - 115
.
OPERATION OPERATION
PROCEDURE FOR SELECTING MODE ACCORDING TO NATURE OR NEEDS TO WORK

Use the table below to select the mode that matches the nature or needs of the operation.
3 - 116
.
OPERATION OPERATION
RIPPER OPERATION
EFFECTIVE METHOD OF USE

The optimum digging angle for the shank is when the shank is
perpendicular to the ground (ripping angle: 45° to 50°).
In comparatively soft rock (seismic velocity: 1500 m/s or below),
it is also possible to carry out ripping with the shank tilted to the
rear.
On comparatively hard rock, if ripping is carried out with the
shank tilted to the rear, there will be excessive wear of the point
of tip (1), and the self-sharpening ability will be lost.
During ripping operations, if the shoes slip because of boulders
or resistance from the bedrock, use the tilt cylinder.
When picking up a stone, advance the machine at a fixed gear
speed (F1 or F2).
REMARK
When raising boulders or digging up rockbed, do not put the
transmission in neutral. If the transmission is in neutral, the
reaction of the tilt cylinder will push the machine back. Always
operate the machine with the transmission in FORWARD.
Choosing a suitable ripper point to match the type of rock is one
of the most important elements in using the ripper effectively.
Ripper points are available for different types of rock, so select
the most suitable ripper point from the list. For details, see
"PROCEDURE FOR SELECTING RIPPER POINT (PAGE
6-4)".
DIGGING UP BOULDERS OR ROCKBED

During ripper operations, if stubborn boulders or rockbed cause the
travel speed to become slower, operate the tilt cylinder to dig up
the boulder/rockbed.
3 - 117
.
OPERATION OPERATION
OPERATING ON SLOPES
When using the variable ripper, adjust the length of the tilt cylinder
to select dimension L.
METHOD OF OPERATING PIN PULLER

1. Stop the machine in a safe place and lower the shank to the
ground.
2. Operate the pin puller controller switch to the PULL OUT
position and remove the mounting pin.
3. Move the ripper up or down to set to the desired shank position.
3 - 118
.
OPERATION OPERATION
4. Operate the pin puller control switch to insert the mounting pin.
If the pin does not match the position of the hole in the shank,
set the pin puller control switch to the PUSH IN position and
slowly move the ripper up or down.
REMARK
When raising the pin position to increase the digging depth, use a
long protector to prevent wear of the shank.
3 - 119
.
OPERATION OPERATION
OPERATING METHOD FOR RIPPING OPERATIONS
BASIC OPERATING METHOD
TRACK OF RIPPER SHANK

Carry out the ripping operation as follows, passing through the points shown in the diagram above.
(1) Tilt the ripper back, lower the ripper point to the ground that the place to begin ripping, and raise the rear of the
machine.
(2) To press the decelerator pedal and lower the engine speed, set the speed range to F1, and tilt the ripper to insert
the point to the specified depth.
(3) When the ripper point reaches the specified depth, raise the engine speed to full speed and travel forward.
Tilt the shank and carry out ripping.
If the circuit is relieved even when the shank is tilted, change the shank mounting hole to the hole below and
reduce the ripping depth.
(4) After completing the ripping, travel forward, raise the shank from the bed rock, then travel in reverse.
(5) While traveling in reverse, tilt the ripper back, and when the starting point for the ripping is reached, lower the
ripper.
REMARK
If the ripper is applied with the rear of the machine raised from
the ground, the drawbar pull will be low, so the ripping efficiency
will be reduced.
If the ripping depth is kept constant, there will be no
unevenness, and this will increase the efficiency of the dozing
operation.
3 - 120
.
OPERATION OPERATION
RIPPING BY CLIFFS
When carrying out ripping at the edge of a cliff, tilt the ripper back
to make depth (L) longer.
Depress the decelerator pedal, drive slowly forward, and when
the ripper point contacts the cliff, tilt the ripper.
RIPPING BY SLOPE FACES

(Giant ripper)
When carrying out ripping work at the edge of slope faces, make
the ripper tilt back angle small, and if there is an area where the
slope face has not been ripped, apply the ripper diagonally.
REMARK
In the case of the multi-shank ripper, carry out ripping at right
angles to the slope face.
Cross ripping
On jobsites with hard bedrock, for rocks and boulders which are
impossible to break or dig up with one ripping pass, carry out the
second ripping pass at right angles to the first ripping direction.
At the edge of cliffs, where it is impossible to apply the ripper in
a cross direction, make the space between the shanks smaller
and carry out ripping.
During the ripping operation, if there is any hard bedrock, carry

out ripping in the opposite direction from the direction where the
ripper was applied. If it is still impossible to break up the rock,
break up the area around the bedrock a little at the time.
When carrying out concentrated ripping of hard bedrock, the
work efficiency is high if the ripper is applied to the whole of the
digging face.
3 - 121
.
OPERATION OPERATION
DIGGING UP BOULDERS
During the ripping operation, if boulders are found which are difficult to break and shoe slippage occurs, dig up the
boulder as follows.
1. Depress the decelerator pedal and lower the engine speed to
a point where there is no shoe slippage.
2. Operate the ripper lever to the TILT position and carry out
ripping and digging.
3. If there are boulders which are impossible to break or dig up

with the tilt operation, move forward slightly and tilt the shank
back, then operate the tilt again and dig up the boulder.
4. Even when the operation in Step 3 is repeated, if it is

impossible to break or dig up the boulder, drive back about 10
cm, raise the shank, avoid the rock or boulder that cannot be
ripped, then drive forward and start ripping again.
3 - 122
.
OPERATION OPERATION
PRECAUTIONS WHEN RIPPING

For the digging angle when ripping, set so that the top of the
shank is perpendicular, then lower the ripper.
Do not carry out ripping for long periods with the shank tilted
back. The tip of the point will wear to a round shape.
Do not change the direction of travel during the ripping

operation. This will cause breakage of the shank. When
changing the direction of travel, remove the shanks from the
ground before turning.
Never drive in reverse when the ripper point is inserted in the

bedrock. The pin installing the point will break and the point will
fall off.
Stop the machine, tilt back slightly, then raise the ripper slowly.
After ripping, if the broken rock is comparatively large, avoid

traveling over the ripping path when traveling in reverse. When
traveling in reverse, check the rear carefully to avoid heating any
large rocks. As far as possible, choose level ground to travel
over.
3 - 123
.
OPERATION OPERATION
ADJUSTING POSTURE OF WORK EQUIPMENT

WARNING
When adjusting, it is dangerous if the work equipment is moved by mistake. Set the work equipment in a safe condition, then stop
the engine and lock the work equipment securely with the work equipment lock lever.
BLADE ADJUSTMENT
TILTING THE TILTDOZER

NOTICE
The maximum tilt is 1000 mm (39.4 in).
Adjust the tilt so that it does not exceed the limit of 1000 mm (39.4 in).
If the maximum tilt is exceeded, excessive force will be brought to bear on all parts, and this will damage the machine.
According to the operation of the blade control lever, the following

tilt amount can be obtained:
Right side: 570 mm (22.5 in) or more
Left side: 570 mm (22.5 in) or more
If more tilt is required, do as follows.
Use bar handle (2) installed to the left brace to turn brace (1) and
change the length (A) of the brace. This makes it possible to obtain
a maximum tilt of 1000 mm (39.4 in).
Standard distance between joints A: 1460 mm (57.5 in)
ADJUSTING SHIM IN BLADE CYLINDER CAP

Set the standard shim adjustment in the blade cylinder cap to 4 mm
(0.16 in).
Remove shims to balance the wear of the cap and the ball at the
end of the piston rod.
The proper clearance to be maintained with the shims is 0.2 to 0.5
mm (0.008 to 0.02 in).
3 - 124
.
OPERATION OPERATION
ADJUSTING BRACE
WARNING
If maintenance is carried out with the engine running, always have one
worker sitting in the operator's seat while another worker carries out the
maintenance. Both workers must mutually confirm the safety during the
operation.
Start the engine and use inching control to tilt to the left and right.
Adjustment can be carried out easily by rotating the brace handle
while raising and lowering.
When extending the brace

It is easy to carry out the adjustment if the blade is set on top of a
block and the brace handle is turned.
REMARK
When operated in this way, the blade is tilted, so the handle
gradually becomes heavier. When this happens, return the blade
from the tilt position to the horizontal position and turn the handle
again according to the procedure given above.
SHIM ADJUSTMENT
Adjust the thickness of shim so that the ball joint play (4 places) in
the axial direction (shown by the arrow) does not exceed 1 mm
(0.04 in).
1. Remove shim (1) and tighten bolts (2) to eliminate the ball joint
play.
2. Measure clearance "A" and remove bolts (2).
3. Install shim (1) having its thickness of "A" mm to "A + 1" mm
("A" in. to "A + 0.04" in) in place with bolts 2.
4. Confirm that ball joint can move smoothly after tightening bolts.
3 - 125
.
OPERATION OPERATION
ADJUSTING RIPPER
ADJUSTING DIGGING DEPTH

Mounting pin holes are provided in the shank and these are used according to the desired digging depth. For normal
use, use the bottom hole, and when particularly deep digging is needed, use the top hole.
For the method of changing the depth of digging,see "METHOD OF OPERATING PIN PULLER (PAGE 3-118)".
1. Place a pointed object on the tip of pin (1), then hit with a
hammer to remove from the opposite side.
2. Remove pin (2) and change the position of the shank hole.
3. Insert pin (1) partially by hand then knock it in with a hammer.
The pin is made of one piece, so insert it partially by hand
then knock it in with a hammer.
When a giant ripper is installed, use the pin puller.
For details, see "METHOD OF OPERATING PIN PULLER
(PAGE 3-118)".
REPLACING POINT AND PROTECTOR

To protect the shank, if the protector and point installed to the tip
are worn, replace them.
Place a pin remover on the pin marked by the arrow, then hit with
a hammer to remove from the opposite side.
REMARK
The pin is a unitized type, so insert the pin partially by hand, then
knock it in fully with a hammer.
3 - 126
.
OPERATION OPERATION
TIPS FOR LONGER UNDERCARRIAGE LIFE

Undercarriage life greatly varies depending on operation method, inspection and maintenance. For most efficient
operation, keep the following point in mind.
OPERATION METHOD
Select the track shoe that best suits the type of soil to be encountered in service.
Consult your Komatsu distributor when selecting track shoes.
Do not allow shoe slipage to occur during operation. If slipage occurs, reduce load to the blade until slipping stops.
Avoid sudden starts, acceleration or stops, unnecessary high speeds and sharp turns.
Always operate machine in a straight line whenever possible. When making turns, be careful not to allow the
machine to stay to one side, so operation in both turning directions can be done properly. Make turns with the
largest possible radius.
Prior to operation, clear boulders and obstacles to prevent machine from riding over them while operating.
On a slope, operate the machine parallel to the inclination of the
slope. Do not operate across the slope. Also when stopping the
machine on a slope, the machine should face toward the top of
the slope.
When ground inclines to the left or right during digging
operations, do not continue to dig with the incline. Move the
machine back to level ground and start to dig again.
Do not force the machine to carry out work that exceeds its
working capability. Such work includes cases where the idler or
sprocket come off the ground when the machine meets
obstacles that resist the power of the machine during dozing or
ripping operations.
INSPECTION AND ADJUSTING

Properly adjust track tension.
Tension should be measured at clearance (A) shown in the
diagram - usually 20 to 30 mm (0.8 to 1.2 in) at this point. For
rocky terrain, tighten tracks slightly. In clay or sandy areas,
slightly loosen them. (For inspection and adjustment
procedures, refer to "CHECK AND ADJUST TRACK TENSION
(PAGE 4-26)").
Check idler rollers for oil leakage as well as for loose bolts and
nuts. If any trouble is detected, repair immediately.
Check the clearance between the idler guide plate and the track
frame. If clearance (B) increases, idler may develop side motion
and tracks may come off. (For inspection and adjustment
procedures, refer to "ADJUST IDLER CLEARANCE (PAGE
4-29)".
3 - 127
.
OPERATION OPERATION
INSPECTION AND REPAIR

Frequent inspection and prompt repair will reduce repair costs.
The following items for inspection will serve as a guide to maintenance service of each undercarriage part. Perform
periodical inspection and contact the Komatsu distributor in your area when machine has approached repairable
limits and reversing limits.
MEASURING HEIGHT OF GROUSER

After taking up slack in track shoes, measure height at center of
shoe as shown below.
Standard height (h): 88 mm (3.5 in)
Repair limits: 30 mm (1.2 in)
MEASURING OUTSIDE DIAMETER OF TRACK ROLLER

1. Measure height (size C) of link tread as shown.
2. Stop machine at position where link tread, whose size C has
been measured completely, contacts roller tread. Then
measure size B.
3. Calculate outside diameter of tread (size A)
A=(B-C)X2
Standard size (A): 255 mm (10.0 in) (Single roller)
Repair limits: 185 mm (7.3 in) (Double roller)
195 mm (7.7 in)
3 - 128
.
OPERATION TRANSPORTATION
TRANSPORTATION
When transporting the machine, observe all related laws and
regulations, and be careful to assure safety.
TRANSPORTATION PROCEDURE
A trailer should be used for transporting the machine.
LOADING, UNLOADING WORK

WARNING
Make sure the ramp has sufficient width, length and thickness to enable the machine to be safely loaded and unloaded.
If the ramp sags appreciably, reinforce it with blocks, etc.
When loading and unloading the machine, park the trailer on a flat firm roadbed. Keep a fairly long distance between the road
shoulder and the machine.
Remove the mud from the undercarriage to prevent the machine from slipping to the side on slopes.
Be sure the ramp surface is clean and free of grease, oil, ice and loose materials.
Never change the direction of travel when on the ramps. If it is necessary to change direction, drive off the ramps and correct
the direction, then drive on to the ramps again.
When loading or unloading, always use ramps or a platform and carry out the operations as follows.
1. Properly apply the brakes on the trailer and insert blocks
beneath the tires to ensure that it does not move. Then fix the
ramps in line with the centers of the trailer and the machine.
2. Set the machine in line with the ramps, then load or unload the
machine at slow travel.
3. Load the machine correctly in the specified position on the
trailer.
PRECAUTIONS FOR LOADING

After placing the machine on the specified position of the trailer, secure it according to the following procedure.
1. Lower the work equipment slowly.
2. Secure control levers with the work equipment lock lever.
3. Set the parking brake lever to the LOCK position.
4. Turn the starting switch to the OFF position stopping the engine, then remove the key.
5. Lock the cab door, left and right engine side covers, and the battery inspection cover.
6. Place blocks under both ends of the tracks to prevent the machine from moving during transportation, and
secure the machine with chains or wire rope of suitable strength.
Be particulary careful to secure the machine in position so it does not slip to the side.
3 - 129
.
TRANSPORTATION OPERATION
METHOD OF LIFTING MACHINE

WARNING
Never perform lifting operations with any person on the machine.
Always make sure that the wire rope (cable) used for lifting the machine is of ample strength for the weight of the machine.
Never try to lift the machine in any posture other than the posture given in the procedure below.
There is danger that the machine may lose its balance.
When lifting the machine,pay careful attention to the center of gravity to maintain the balance.
When lifting the machine, perform the operation on flat ground as

follows:
1. Stop the engine and be sure to set the parking lever to the
LOCK position.
2. Set the lifting position for the machine as shown in the diagram
on the right.
NOTICE
The lifting procedure applies to machines with standard specifications.
The method of lifting differs according to attachments and options actually
installed on the machine. For the proper lifting procedures, contact your
For details of the weight, see "SPECIFICATIONS (PAGE

5-2)".
3 - 130
.
OPERATION TRANSPORTATION
PRECAUTIONS FOR TRANSPORTATION

WARNING
Determine the route for transporting the machine by taking into account
the width, height and weight of the machine.
Obey all state and local laws governing the weight, width and
length of a load. Observe all regulations governing wide loads.
TRAVELING ON ROADS
When traveling on paved roads, use flat shoes to protect their surface.
Even when travelling a short distance, always place boards to protect the road surface.
REMARK
Note that the asphalt road becomes soft in summer.
REMOVAL OF CAB
(Machines equipped with cab)
If it is necessary to remove the cab for transportation, disconnect
the washer hoses, cab wiring, and washer motor wiring before
removing the cab.
1. Pull the grommet portion in towards the cab from the hole in the
machine cover, then remove.
2. Disconnect 4 washer hoses and the wiring (single wires x 2,
4-pin plug x 1) from the socket.
After removing, cover the washer hoses with a vinyl bag to
prevent any dirt or dust from entering.
Before removing the cab, measure the clearance between
the cab and each lever (joystick and blade control lever,
etc.). Note the measurements to use as a standard when
installing the cab again.
3 - 131
.
TRANSPORTATION OPERATION
INSTALLATION OF CAB
(Machines equipped with cab)
Install the cab parts in the opposite order to removal.
Connect all parts that were disconnected.
Install the cab mounting bolts as follows.
1. Lower the cab slowly on top of the floor frame.
2. Align the cab with the floor frame, then install bolts and
washers in holes (A) - (U).
Do not screw the bolts in fully. Screw them in 3 or 4 turns.
3. Tighten the bolts in holes (N) - (U) fully.
Tighten in the order (N), (U), (Q), (R), (O), (T), (P), (S).
4. Tighten the bolts, (A) to (M), completely.
If there are any unclear points about removing or installing the

cab, please contact your Komatsu distributor.
3 - 132
.
OPERATION COLD WEATHER OPERATION
COLD WEATHER OPERATION

PRECAUTIONS FOR LOW TEMPERATURE
If the temperature becomes low, it becomes difficult to start the engine, and the coolant may freeze, so do as follows.
FUEL AND LUBRICANTS

Change to oil with low viscosity for all components. For details of the specified visicosity, see "RECOMMENDED
FUEL, COOLANT, AND LUBRICANT (PAGE 4-10)".
COOLANT
WARNING
Antifreeze is toxic. Be careful not to get it into your eyes or on your skin. If it should get into your eyes or on your skin, wash
it off with large amounts of fresh water and see a doctor at once.
When changing the coolant or when handling coolant containing antifreeze that has been drained when repairing the radiator,
please contact your Komatsu distributor or request a specialist company to carry out the operation. Antifreeze is toxic. Do not
let it flow into drainage ditches or spray it onto the ground surface.
Antifreeze is flammable. Do not bring any flame close. Do not smoke when handling antifreeze.
NOTICE
Use Komatsu Supercoolant wherever available, or use permanent type antifreeze coolant.
Never use methanol, ethanol, or propanol-based antifreeze.
Do not use any water leakage prevention agent, either alone, or in combination with antifreeze.
Do not mix one brand of antifreeze with a different brand.
For details of the antifreeze mixture when changing the coolant, see "CLEAN INSIDE OF COOLING SYSTEM
(PAGE 4-20)".
3 - 133
.
COLD WEATHER OPERATION OPERATION
BATTERY
WARNING
The battery generates flammable gas. Do not bring fire or sparks near the battery.
Battery electrolyte is dangerous. If it gets in your eyes or on your skin, wash it off with a large amount of water and consult a
doctor.
Battery electrolyte dissolves paint. If it gets on the bodywork, wash it off immediately with water.
If the battery electrolyte is frozen, do not charge the battery or start the engine with a different power source. There is danger
that the battery may explode.
Battery electrolyte is toxic. Do not let it flow into drainage ditches or spray it on to the ground surface.
When the ambient temperature drops, the capacity of the battery will also drop. If the battery charge ratio is low, the
battery electrolyte may freeze. Maintain the battery charge as close as possible to 100%. Insulate it against cold
temperature to ensure the machine can be started easily the next morning.
REMARK
Measure the specific gravity and calculate the charging rate from the following conversion table.
Electrolyte
Temperature
(°C) 20 0 -10 -20
Charging
Rate (%)
100 1.28 1.29 1.30 1.31
90 1.26 1.27 1.28 1.29
80 1.24 1.25 1.26 1.27
75 1.23 1.24 1.25 1.26
As the battery capacity drastically drops in low temperatures, cover or remove the battery from the machine, store
the battery in a warm place, and install it again the next morning.
If the electrolyte level is low, add distilled water in the morning before beginning work. Do not add water after the
day's work to prevent diluted electrolyte in the battery from freezing during the night.
AFTER COMPLETION OF WORK

To prevent mud, water, or the undercarriage from freezing and making it impossible for the machine to move on the
following morning, observe the following precautions.
Remove all the mud and water from the machine body. In particular, wipe the hydraulic cylinder rod clean to
prevent damage to the seal caused by mud, dirt, or drops of water on the rod from getting inside the seal.
Park the machine on hard, dry ground.
If this is impossible, park the machine on boards.
The boards prevent the tracks from freezing to the ground, and allow the machine to be moved the next morning.
Open the drain valve and drain any water collected in the fuel system to prevent it from freezing.
Fill the fuel tank to capacity. This minimizes moisture condensation in the tank when the temperature drops.
AFTER COLD WEATHER

When the season changes and the weather becomes warmer, do as follows.
Replace the fuel and oil for all parts with oil of the viscosity specified.
For details, see "RECOMMENDED FUEL, COOLANT, AND LUBRICANT (PAGE 4-10)".
When it is unnecessary to use the automatic starting aid (APS) (When the ambient temperature is above 15°C
(59°F)), Always keep the fuel valve closed.
3 - 134
.
OPERATION LONG-TERM STORAGE
LONG-TERM STORAGE
BEFORE STORAGE
When keeping in long-term storage (more than one month), store as follows.
Clean and wash all parts, then store the machine indoors. If the machine has to be stored outdoors, select level
ground and cover the machine with a sheet.
Completely fill the fuel tank. This prevents moisture from collecting.
Lubricate and change the oil before storage.
Apply a thin coat of grease to metal surface of the hydraulic piston rods and the idler adjusting rods.
Disconnect the negative terminals of the battery and cover it or remove it from the machine and store it separately.
Place all control levers in the neutral position, set the work equipment lock lever and parking brake lever in the
LOCK position, and set the fuel control dial to the low idle position.
To prevent corrosion, be sure to fill the cooling system with Supercoolant (AF-NAC) or permanent type antifreeze
(density between 30% and 68%).
DURING STORAGE
WARNING
If it is necessary to perform the rust-prevention operation while the machine is indoors, open the doors and windows to improve
ventilation and prevent gas poisoning.
During storage, operate and move the machine for a short distance once a month so that a new film of oil will coat
moving parts. At the same time, also charge the battery.
Before operating the work equipment, wipe the grease off the hydraulic piston rod.
For machines equipped with an air conditioner, run the air conditioner.
AFTER STORAGE
NOTICE
If the machine has been stored without carrying out the monthly rust-prevention operation, consult your Komatsu distributor
before using it.
When using the machine after long-term storage, do as follows before using it.
Wipe off the grease from the hydraulic cylinder rods.
Add oil and grease at all lubrication points.
When the machine is stored for a long period, moisture in the air will mix with the oil. Check the oil before and after
starting the engine. If there is water in the oil, change all the oil.
3 - 135
.
TROUBLESHOOTING OPERATION
TROUBLESHOOTING
AFTER RUNNING OUT OF FUEL
When starting the engine again after running out of fuel, fill with fuel, then bleed the air from the fuel system before
starting the engine.
Always watch the fuel level and be careful not to run out of fuel.
If the engine has stopped because of lack of fuel, it is necessary to use the priming pump to bleed the air completely
from the fuel circuit.
PROCEDURE FOR BLEEDING AIR

CAUTION
This engine consists of higher precision parts than on the conventional fuel injection pump and nozzle, so if dirt gets in, it will
cause problems. If there is any dirt stuck to the fuel line, use fuel to wash it off completely.
Be careful when opening the air bleed plug at the fuel filter head and the air bleeder of the supply pump. The system is still
under pressure and fuel may spurt out.
1. Loosen air bleed plug (A), (B) at the fuel filter head (1).
2. Loosen the knob of priming pump (2), then pump the knob until
no more bubbles come out of air bleed plug (A).
3. Wrap sealing tape around air bleed plug (A) before tightening
it.
Tightening torque: 2.0 to 3.9 N·m (0.2 to 0.4 kgf·m, 1.4 to 2.9
lbft)
4. Operate the priming pump again and check that no more

bubbles come out with the fuel from air bleed plug (B).
5. Tighten air bleed plug (B).
lbft)
6. Loosen air bleeder (3) of the supply pump.

7. Pump priming pump (2) approx. 90 - 100 times until no more
bubbles come out with the fuel from air bleeder (3), then tighten
air bleeder (3).
lbft)
8. Continue pumping (approx. 50 times) until the priming pump (2) becomes stiff and the overflow valve release
sound becomes continuous.
3 - 136
.
OPERATION TROUBLESHOOTING
9. Push in the knob of priming pump (2) and tighten it.

10. Turn the key in the starting switch to the START position and start the engine.
When doing this, do not crank the starting motor continuously for more than 20 seconds. If the engine does not
start, wait for at least 2 minutes, then try again. Perform this operation a maximum of 4 times.
11. If the engine does not start, repeat the operation from Step 1.
METHOD OF TOWING MACHINE

WARNING
Be sure to use a wire rope sufficiently strong for the towing weight.
When using the towing hook, be sure to use a shackle.
Set the wire rope level and align it with the track frame.
Tow the machine slowly.
If the machine sinks in mud and cannot get out under its own
power, or if being used to tow a heavy object, fit the wire to the
towing hook as shown in the diagram on the right, or in the case of
machines with a drawbar, fit the wire to the drawbar pin when
towing.
NOTICE
Permissible load for towing hook: 37,500 kgf (367,750 N)
Always carry out towing operations within the specified range for the
permissible load.
3 - 137
.
IF BATTERY IS DISCHARGED
WARNING
When checking or handling the battery, stop the engine and turn the
starting key to the OFF position before starting.
The battery generates hydrogen gas, so there is danger of explosion. Do
not bring lighted cigarettes near the battery or do anything that will
cause sparks.
Battery electrolyte is dilute sulphuric acid, and it will attack your clothes
and skin. If it gets on your clothes or on your skin, wash it immediately
off with large amounts of water. If it gets in your eyes, wash it out with
fresh water, and consult a doctor.
Wear protective glasses and rubber gloves when handling the battery.
When removing the battery, first disconnect the cable fro the ground
(normally, from the negative (-) terminal). When installing, install the
positive (+) terminal first. If a tool touches the cable connecting the
positive terminal and the chassis, there is danger that it will cause
sparks.
If the terminals are loose, there is danger that the defective contact may
generate sparks that will cause an explosion.
When installing the terminals, install them tightly.
Check the positive (+) and negative (-) terminals carefully when
removing or installing.
STARTING ENGINE WITH BOOSTER CABLE

When starting the engine with a booster cable, do as follows.
REMOVAL, INSTALLATION OF BATTERY CABLE

1. Open battery cover (1), (2).
2. Before removing the battery, remove the ground cable
(normally connected to the negative (-) terminal). If any tool
touches between the positive terminal and the chassis, there is
danger of sparks being generated. Loosen the nut of the
terminal and remove the wires from the battery.
3. When installing the battery, connect the ground cable last.
Insert the hole of the terminal on the battery and tighten the nut.
Tightening torque: 9.8 to 19.6 N·m (1 to 2 kgf·m, 7.2 to 14.5
lbft)
4. Close battery cover (1).
3 - 138
.
PRECAUTIONS WHEN CONNECTING AND DISCONNECTING BOOSTER CABLE
WARNING
When connecting the cables, never contact the positive (+) and negative
(-) terminals.
When starting the engine with a booster cable, wear safety glasses and
rubber gloves.
Be careful not to let the normal machine and problem machine contact
each other. This prevents sparks from generating near the battery which
could ignite the hydrogen gas given off by the battery.
Make sure that there is no mistake in the booster cable connections.
The final connection is to the engine block of the problem machine, but
sparks will be generated when this is done, so connect to a place as far
as possible from the battery.
When disconnecting the booster cable, take care not to bring the clips
in contact with each other or with the machine body.
NOTICE
The size of the booster cable and clip should be suitable for the battery size.
The battery of the normal machine must be the same capacity as that of the engine to be started.
Check the cables and clips for damage or corrosion.
Make sure that the cables and clips are firmly connected.
Check that the work equipment lock levers and parking brake levers of both machines are in the LOCK position.
Check that each lever is in the NEUTRAL position.
CONNECTING THE BOOSTER CABLES

Keep the starting switch of the normal machine and problem machine both at the OFF position.
Connect the booster cable as follows, in the order of the numbers marked in the diagram.
1. Connect one clip (1) of booster cable (A) to the positive (+)
terminal of the discharged battery.
2. Connect the other clip (2) of booster cable (A) to the positive (+)
terminal of the booster battery.
3. Connect one clip of booster cable (B) to the negative (-)
terminal of the booster battery.
4. Connect the other clip of booster cable (B) to the engine block
of the problem machine.
STARTING THE ENGINE

1. Make sure the clips are firmly connected to the battery terminals.
2. Start the engine of the booster machine and keep it running at high idling speed.
3. Turn the starting switch of problem machine to the START position, and start the engine. If the engine doesn't
start at first, try it again after 2 minutes.
3 - 139
.
DISCONNECTING THE BOOSTER CABLES

After the engine has started, disconnect booster cables in the reverse order in which they were connected.
1. Remove clip of booster cable (B) from the engine block of
problem machine.
2. Remove clip of booster cable (B) from negative (-) terminal of
the booster battery.
3. Remove clip of booster cable (A) from the positive (+) terminal
of booster battery.
4. Remove clip (4) of booster cable (A) from positive (+) terminal
of the discharged battery.
3 - 140
.
OTHER TROUBLE
ELECTRICAL SYSTEM
( ): Always contact your Komatsu distributor when dealing with these items.
In cases of problem or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem Main cause Remedy

Lamp does not glow brightly even Defective wiring ( Check, repair loose terminals,
when the engine runs at high speed disconnections
Check fuses and diodes in fuse
box)
Lamp flickers while engine is Fefective adjustment of fan belt Adjust fan belt tension
running tension For details, see EVERY 250
HOURS SERVICE
Charge lamp doe not go out even Defective alternator ( Replace)
whhen engine is running Defective wiring ( Check, repair
Check fuse, diode in fuse box)
Abnormal noise is generated from Defective alternator ( Replace)
alternator
Starting motor does not crank Defective wiring ( Check, repair)
when starting switch is turned ON Insufficient battery charge Charge
Pinion of starting motor keeps Insufficient battery charge Charge
going in and out
Starting motor turns engine Insufficient battery charge Charge
sluggishly Defective starting motor ( Replace)
Starting motor disengages before Defective wiring ( Check, repair)
engine starts Insufficient battery charge Charge
Engine pre-heating monitor lamp Defective wiring ( Check, repair)
does not light up Defective timer ( Replace)
(When the temperature of the Defective monitor ( Replace)
engine coolant exceed 20°C Disconnection in glow plug ( Replace)
(68°F), this condition is normal)
Air conditioner operation is Blown fuse ( Check, repair)
defective Insufficient battery charge Charge
Defective air conditioner switch ( Replace air conditioner switch)
Defective blower switch ( Replace blower switch)
Defective compressor ( Replace)
Blade does not pitch when pitch Defective wiring ( Check, repair)
operation is carried out (dual tilt Defective switch ( Replace)
specification machine only) Defective solenoid valve ( Replace)
3 - 141
.
MONITOR PANEL
When an error code appears on the display panel B
(multi-information), take appropriate remedies based upon the
table below.
Abnormality Method of displaying

Abnormality Remedy
code abnormality
E01 Lock up torque converter does Abnormality code and The automatic functions stop and
not come ON service hour are some functions stop, but it is still
Dual tilt does not work displayed in turn on possible to carry out operations.
service meter portion Please contact your Komatsu
distributor immediately for repairs.
E02 Tilt limit does not work Abnormality code and If user stops engine and then
Does not shift up or shift down service hour are starts again, operations are
Pitch does not work displayed in turn on possible without limit functions.
service meter portion, However, user must be careful.
caution lamp flashes, Please contact your Komatsu
buzzer sounds distributor immediately for repairs.
E03+CALL Number of speed ranges that Abnormality code and Move machine to a safe place,
can be used is limited service hour are then contact your Komatsu
Engine does not run at full displayed in turn on distributor immediately for repairs.
speed service meter portion,
Excessive shock when shifting caution lamp flashes,
gear buzzer sounds
Turning ability becomes poor
Excessive braking shock
Abnormal engine coolant
temperature sensor
E04+CALL Engine control impossible Abnormality code and Stop machine, then contact your
Travel impossible service hour are Komatsu distributor immediately
Machine does not stop displayed in turn on for repairs.
service meter portion,
caution lamp flashes,
buzzer sounds
3 - 142
.
CHASSIS
Problem Main causes Remedy

Oil pressure in torque converter Improper tightening of oil pipe, Check, repair
fails to rise pipe joint, air leaking in or oil
leaking out because of damage
Wear, scuffing of gear pump ( Check, replace)
Insufficient oil in power train case Add oil to the specified level. For
details, see CHECK BEFORE
STARTING
Clogged oil filter element strainer Clean. For details, see EVERY
in power train case 500 HOURS SERVICE
Torque converter is overheats Clogged radiator Clean radiator core
Engine water temperature is high See Engine related parts
Clogged oil cooler ( Clean or replace)
Oil pressure too low Go to "Oil pressure in torque
converter fails to rise"
Lack of flow of lubricant caused ( Replace gear pump)
by wear of power train gear pump
Torque converter oil temperature Defective oil temperature gauge ( Replace oil temperature gauge)
gauge does not work Defective contact in wiring ( Check, repair)
connection
Lacks drawbar pull (machine does Lack of engine horsepower See Engine related parts
not pick up speed) Oil pressure in torque converter Go to "Oil pressure in torque
is too low converter fails to rise"
Machine will not move off when Insufficient oil in power train caseAdd oil to the specified level. For
joystick is placed at FORWARD details, see CHECK BEFORE
Transmission oil pressure does Go to oil pressure in torque
not rise converter fails to rise
Defective lever wiring ( Check, repair)
Parking lever is at LOCK position Set to FREE position
Does not steer even when steering Brake is not applied on side ( Adjust linkage and check brake
is operated which is pulled pressure)
Parking lever is at LOCK position Set to FREE position
Defective lever wiring ( Check, repair)
Abnormality HSS pump ( Check, replace)
Abnormality HSS motor ( Check, replace)
Machine doesn't stop when brake Defective brake adjustment ( Adjust linkage)
pedal are depressed ( Check brake pressure)
Track comes off Track is too loose Adjust track tension. For details,
see WHEN REQUIRED.
Sprocket develops abnormal wear Track is too loose or too tight Adjust track tension. For details,
see WHEN REQUIRED.
Machine does not travel in straight Defective adjustment of HSS ( Adjust)
line controller
Abnormality HSS pump ( Replace)
3 - 143
.

Blade rises too slowly or does not Lack of hydraulic oil Add oil to specified level. For
rise at all details, see EVERY 250 HOURS
(or blade tilts too slowly) SERVICE
Defective solenoid valve Replace
Defective hydraulic switch Replace
Work equipment lock lever is at Set to FREE position
LOCK position
Ripper moves too slowly, does not Lack of hydraulic oil position Add oil to specified level. For
move details, see EVERY 250 HOURS
SERVICE
Defective hydraulic oil pressure Replace
switch
Defective solenoid valve Replace
Work equipment lock lever is at Set to FREE position
LOCK position
Insufficient force of ripper Leakage from piping ( Tighten)
3 - 144
.
ENGINE

Engine oil pan oil level is low Add oil to specified level, see
(sucking in air) CHECK BEFORE STARTING
Clogged oil filter cartridge Replace cartridge, see EVERY
Engine oil pressure monitor flashes
500 HOURS SERVICE
when engine speed is raised after
Defective tightening of oil pipe ( Check, repair)
completion of warm-up
joint, oil leakage from damaged
part
Defective monitor panel ( Replace)
Coolant level low, water leakage Add coolant, repair, see
Steam is emitted from top part of Dirt or scale accumulated in Change coolant, clean
radiator (pressure valve) cooling system inside of cooling system, see
WHEN REQUIRED
Clogged radiator fins or Clean or repair, see WHEN
damaged fins REQUIRED
Defective thermostat ( Replace thermostat)
Engine water temperature monitor Loose radiator filler cap (high Tighten cap or replace packing
remains alight altitude operation) altitude operation)
Defective monitor panel ( Replace)
Lack of fuel Add fuel, see CHECK BEFORE
STARTING
Air in fuel system Repair place where air is sucked
Engine does not start when starting in
motor is turned No fuel in fuel filter ( Replace pump or nozzle)
Starting motor cranks engine See ELECTRICAL SYSTEM
sluggishly
Defective valve compression ( Adjust valve clearance)
Too much oil in oil pan Add oil to specified level, see
Exhaust gas is white or blue CHECK BEFORE STARTING
Improper fuel Change to specified fuel
Clogged air cleaner element Clean or replace, see WHEN
REQUIRED
Exhaust gas occasionally turns
Defective nozzle ( Replace nozzle)
black
Defective compression ( Adjust valve clearance)
Defective turbocharger ( Clean or replace, turbocharger)
Combustion noise occasionally Defective nozzle ( Replace nozzle)
makes breathing sound Lack of fuel (in Air) Add fuel
Low grade fuel being used Change to specified fuel
Overheating See item "Indicator of water
Abnormal noise generated temperature gauge is in red
(combustion or mechanical) range on right side of gauge".
Damage inside muffler ( Replace muffler)
Excessive valve clearance ( Adjust valve clearance)
Monitor displays error code
Alarm buzzer sounds
Engine horsepower lowered Please contact your Komatsu distributor
suddenly
(Engine is running in duration
mode)
3 - 145
.
WHEN MODE SELECTION SYSTEM FLASHES

If the caution lamp flashes, or it becomes impossible to control the engine speed with the fuel control dial or
decelerator pedal, stop operation immediately, check the monitor panel display, then contact your Komatsu
distributor for repairs.
In addition to the above problems, if any of the problems in the table below occur, there is probably an abnormality
in the work equipment lever switch, transmission speed range sensor, or other part, so please contact your Komatsu
Mode Operation Abnormality

Engine speed varies, difficult to carry out operation
Economy Dozing
No sense of control, engine stays at full or partial
Ripper RAISE speed is slow
Slow reverse Reverse
Slow reverse speed is slow
Lock-up does not work
Lock-up All operations
Gearshifting shock becomes excessive
Traveling under Engine speed becomes partial when traveling under own
-
own power power
3 - 146
.
4-1
.
GUIDES TO MAINTENANCE MAINTENANCE
GUIDES TO MAINTENANCE
Do not perform any inspection and maintenance operation that is not found in this manual.
Stop the machine on flat hard ground when performing inspections and maintenance.
CHECK SERVICE METER:

Check the service meter reading every day to see if the time has come for any necessary maintenance to be
performed.
KOMATSU GENUINE REPLACEMENT PARTS:

Use Komatsu genuine parts specified in the Parts Book as replacement parts.
KOMATSU GENUINE OILS:

Use Komatsu genuine oils and grease. Choose oils and grease with proper viscosities specified for ambient
temperature.
ALWAYS USE CLEAN WASHER FLUID:

Use automobile window washer fluid, and be careful not to let any dirt get into it.
CLEAN OIL AND GREASE:

Use clean oil and grease. Also, keep the containers of the oil and grease clean. Keep foreign materials away from
oil and grease.
CHECK FOREIGN MATERIAL IN DRAINED OIL:

After oil is changed or filters are replaced, check the old oil and filters for metal particles and foreign materials. If large
quantity of metal particles or foreign materials are found, always report to the person in charge, and carry out
suitable action.
FUEL STRAINER:
If your machine is equipped with a fuel strainer, do not remove it while fueling.
WELDING INSTRUCTIONS:
Turn off the engine starting switch.
Do not apply more than 200 V continuously.
Connect grounding cable within 1 m (3.3 ft) of the area to be welded. If grounding cable is connected near
instruments, connectors, etc., the instruments may malfunction.
If a seal or bearing happens to come between the part being welded and grounding point, change the grounding
point to avoid such parts.
Do not use the area around the work equipment pins or the hydraulic cylinders as the grounding point.
OBJECTS IN YOUR POCKETS:

When opening inspection windows or the oil filler port of the tank to carry out inspection, be careful not to drop
nuts, bolts, or tools inside the machine.
If such things are dropped inside the machine, it may cause damage and/or malfunction of the machine, and will
lead to failure. If you drop anything inside the machine, always remove it immediately.
Do not put unnecessary things in your pockets. Carry only things which are necessary for inspection.
DUSTY WORKSITES:
When working at dusty worksites, do as follows:
Inspect the air cleaner clogging monitor frequently to see if the air cleaner is clogged.
Clean the air cleaner element at a shorter interval than specified.
4-2
.
MAINTENANCE GUIDES TO MAINTENANCE
Clean the radiator core frequently to avoid clogging.

Clean and replace the fuel filter frequently.
Clean electrical components, especially the starting motor and alternator, to avoid accumulation of dust.
When inspecting or changing the oil, move the machine to a place that is free of dust to prevent dirt from getting
into the oil.
AVOID MIXING OILS:

If a different brand or grade of oil has to be added, drain the old oil and replace all the oil with the new brand or grade
of oil. Never mix different brand or grade of oil.
LOCKING INSPECTION COVERS:

Lock inspection cover securely into position with the lock bar. If inspection or maintenance is performed with
inspection cover not locked in position, there is a danger that it may be suddenly blow shut by the wind and cause
injury to the worker.
BLEEDING AIR:
When hydraulic equipment has been repaired or replaced, or the hydraulic piping has been removed and installed
again, the air must be bled from the circuit. For details, see "BLEEDING AIR IN HYDRAULIC SYSTEM (PAGE
4-41)".
PRECAUTIONS WHEN INSTALLING HYDRAULIC HOSES:

When removing parts at locations where there are O-rings or gasket seals, clean the mounting surface, and
replace with new parts.
When doing this, be careful not to forget to assemble the O-rings and gaskets.
When installing the hoses, do not twist or bend them into loops with a small radius.
This will cause damage to the hose and drastically reduce its service life.
CHECKS AFTER INSPECTION AND MAINTENANCE:

If you forget to perform the checks after inspection and maintenance, unexpected problems may occur, and this may
lead to serious injury or property damage. Always do the following:
Checks after operation (with engine stopped)
Have any inspection and maintenance points been forgotten?
Have all inspection and maintenance items been performed correctly?
Have any tools or parts been dropped inside the machine? It is particularly dangerous if parts are dropped
inside the machine and get caught in the lever linkage mechanism.
Are there any leakage of coolant or oil? Have all nuts and bolts been tightened?
Checks when operating engine
For details of the checks when operating the engine, see "PROPER TOOLS (PAGE 2-29)" and pay careful
attention to safety.
Are the inspection and maintenance items working properly?
Is there any leakage of fuel or oil when the engine speed is raised?
4-3
.
GUIDES TO MAINTENANCE MAINTENANCE
PRECAUTIONS WHEN OPENING AND CLOSING ENGINE SIDE COVER:

When standing on track to open the engine side cover, adopt a
standing position, hold the side cover with both thumbs, and
open it slowly with your other fingers.
When the side cover is open, do not open or close the cab.
Before opening or closing the cab, always close the engine side
cover first.
4-4
.
MAINTENANCE OUTLINES OF SERVICE
OUTLINES OF SERVICE
Always use Komatsu genuine parts for replacement parts, grease or oil.
When changing the oil or adding oil, do not mix different types of oil. When changing the type of oil, drain all the
old oil and fill completely with the new oil. Always replace the filter at the same time. (There is no problem if the
small amount of oil remaining in the piping mixes with the new oil.)
Unless otherwise specified, when the machine is shipped from the factory, it is filled with the oil and coolant listed
in the table below.
Item Type
Engine oil pan Engine oil EO15W40DH (Komatsu genuine parts)
Power train case
Final drive case Power train oil TO30 (Komatsu genuine parts)
Damper case
Hydraulic system Power train oil TO10 (Komatsu genuine parts)
Radiator Supercoolant AF-NAC (Density: 30% or above) (Komatsu genuine parts)
HANDLING OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC
OIL
Oil is used in the engine and hydraulic equipment under extremely severe conditions (high temperature, high
pressure), and deteriorates with use.
Always use oil that matches the grade and maximum and minimum ambient temperatures recommended in the
Operation and Maintenance Manual. Even if the oil is not dirty, always change the oil after the specified interval.
Oil corresponds to blood in the human body, so always be careful when handling it to prevent any impurities
(water, metal particles, dirt, etc.) from getting in.
The majority of problems with the machine are caused by the entry of such impurities.
Take particular care not to let any impurities get in when storing or adding oil.
Never mix oils of different grades or brands.
Always add the specified amount of oil.
Having too much oil or too little oil are both causes of problems.
If the oil in the work equipment is not clear, there is probably water or air getting into the circuit. In such cases,
please contact your Komatsu distributor.
When changing the oil, always replace the related filters at the same time.
We recommend you have an analysis made of the oil periodically to check the condition of the machine. For
those who wish to use this service, please contact your Komatsu distributor.
When using commercially available oil, it may be necessary to reduce the oil change interval.
We recommend that you use the Komatsu oil clinic to carry out a detailed checks of the characteristics of the oil.
FUEL
To prevent the moisture in the air from condensing and forming water inside the fuel tank, always fill the fuel tank
after completing the day's work.
The fuel pump is a precision instrument, and if fuel containing water or dirt is used, it cannot work properly.
Be extremely careful not to let impurities get in when storing or adding fuel.
Always use the fuel specified in the Operation and Maintenance Manual.
Fuel may congeal depending on the temperature when it is used (particularly in low temperatures below -15°C
(5°F)), so it is necessary to use the fuel that is suitable for the temperature.
Before starting the engine, or when 10 minutes have passed after adding fuel, drain the sediment and water from
the fuel tank.
If the engine runs out of fuel, or if the filters have been replaced, it is necessary to bleed the air from the circuit.
If there is any foreign material in the fuel tank, wash the tank and fuel system.
4-5
.
OUTLINES OF SERVICE MAINTENANCE
COOLANT AND WATER FOR DILUTION

The coolant has the important function of preventing corrosion as well as preventing freezing.
Even in the areas where freezing is not an issue, the use of antifreeze coolant is essential.
Komatsu machines are supplied with Komatsu Supercoolant (AF-NAC). Komatsu Supercoolant (AF-NAC) has
excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4000 hours.
Komatsu Supercoolant (AF-NAC) is strongly recommended wherever available.
When diluting the antifreeze coolant, use distilled water or tap water (soft water).
Natural water, such as a river water or well water (hard water), contains large amounts of minerals (calcium,
magnesium, etc.), and this makes it easier for scale to form inside the engine or radiator. Once scale is deposited
inside the engine or radiator, it is extremely difficult to remove. It also causes overheating due to poor heat
exchange, so when you dilute the coolant, we recommend that you use water with an overall hardness of less
than 100 PPM.
When using antifreeze, always observe the precautions given in the Operation and Maintenance Manual.
Antifreeze coolant is flammable, so be sure to keep it away from flame.
The ratio of Supercoolant (AF-NAC) to water differs according to the ambient temperature.
For details of the ratio when mixing, see "CLEAN INSIDE OF COOLING SYSTEM (PAGE 4-20)".
Supercoolant (AF-NAC) may be supplied already mixed. In such cases, never dilute with water.
If the engine overheats, wait for the engine to cool before adding coolant.
If the coolant level is low, it will cause overheating, and will also cause problems with corrosion due to air entering
the coolant.
GREASE
Grease is used to prevent seizure and noises at the joints.
This construction equipment is used under heavy-duty conditions. Always use the recommended grease and
follow the change intervals and recommended ambient temperatures given in this Operation and Maintenance
Manual.
The nipples not included in the MAINTENANCE section are nipples used when overhauling, so they do not need
grease.
If any part becomes stiff or generates noise after being used for a long time, grease it.
Always wipe off all of the old grease that is pushed out when greasing.
Be particularly careful to wipe off the old grease in places where sand or dirt sticking in the grease would cause
wear of the rotating parts.
4-6
.
MAINTENANCE OUTLINES OF SERVICE
CARRYING OUT KOWA (Komatsu Oil Wear Analysis)

KOWA is a maintenance service that makes it possible to prevent machine failures and downtime. With KOWA, the
oil is periodically sampled and analyzed. This enables early detection of wear of the machine drive parts and other
abnormalities.
We strongly recommend you to use this service. The oil analysis is carried out at actual cost, so the cost is low, and
the results of the analysis are reported together with recommendations which will reduce repair costs and machine
downtime.
KOWA ANALYSIS ITEMS

Measurement of density of metal wear particles
This uses an ICP (Inductively Coupled Plasma) analyzer to
measure the density of iron, copper, and other metal wear
particles in the oil.
Measurement of particle quantity

This uses a PQI (Particle Quantifier Index) measurer to
measure the quantity of large iron particles in the oil.
OIL SAMPLING
Sampling interval
250 hours: Engine
500 hours: Other components
Precautions when sampling

Make sure that the oil is well mixed before sampling.
Perform sampling at regular fixed intervals.
Do not perform sampling on rainy or windy days when water or dust can get into the oil.
For further details of KOWA, please contact your Komatsu distributor.
4-7
.
OUTLINES OF SERVICE MAINTENANCE
STORING OIL AND FUEL

Keep indoors to prevent any water, dirt, or other impurities from getting in.
When keeping drum cans for a long period, put the drum on its side so that the filler port of the drums is at the side
to prevent moisture from being sucked in.
If drums have to be stored outside, cover them with a waterproof sheet or take other measures to protect them.
To prevent any change in quality during long-term storage, be sure to use in the order of first in - first out (use the
oldest oil or fuel first).
FILTERS
Filters are extremely important safety parts. They prevent impurities in the fuel and air circuits from entering
important equipment and causing problems.
Replace all filters periodically. For details, see the Operation and Maintenance Manual.
However, when working in severe conditions, replace the filters at shorter intervals according to the oil and fuel
(sulfur content) being used.
Never try to clean the filters (cartridge type) and use them again. Always replace with new filters.
When replacing oil filters, check if any metal particles are affixed to the old filter. If any metal particles are found,
contact your Komatsu distributor.
Do not open packs of spare filters until just before they are to be used.
Always use Komatsu genuine filters.
OUTLINE OF ELECTRIC SYSTEM

It is extremely dangerous if the electrical equipment becomes wet or the covering of the wiring is damaged. This
will cause an electrical short circuit and may lead to malfunction of the machine. Do not wash the inside of the
operator's cab with water. When washing the machine, be careful not to let water get into the electrical
components.
Service relating to the electric system is checking fan belt tension, checking damage or wear to the fan belt and
checking battery fluid level.
Never install any electric components other than those specified by Komatsu.
External electro-magnetic interference may cause malfunction of the control system controller, so before
installing a radio receiver or other wireless equipment, contact your Komatsu distributor.
Be careful to keep the electric system free of water when washing the machine or when it rains.
When working at the seashore, carefully clean the electric system to prevent corrosion.
When installing an operator's cab cooler or any other electrical equipment, connect it to an independent power
source connector. The optional power source must never be connected to the fuse, starting switch, or battery
relay.
4-8
.
MAINTENANCE WEAR PARTS LIST
WEAR PARTS LIST

Wear parts such as the filter element, cutting edge, etc. are to be replaced at the time of periodic maintenance or
before their abrasion limits.
The wear parts should be changed correctly in order to use the machine economically.
For part change, Komatsu genuine parts of excellent quality should be used.
When requesting parts, check their part numbers from the parts list.
WEAR PARTS LIST

The parts in parentheses are to be replaced at the same time.
Item Part No. Part Name Weight Q'ty Replacement frequency
Engine oil filter 600-211-1340 Cartridge - 1 Every 500 hours service

07063-01100 Element 1
Power train oil filter - Every 500 hours service
(07000-02130) (O-ring) (1)
07063-01100 Element 1
Steering lubrication oil filter - Every 500 hours service
(07000-02130) (O-ring) (1)
Every 500 hours service
(Without additional fuel filter)
Fuel filter 600-319-3520 Cartridge - 1
Every 1000 hours service
(With additional fuel filter)
Additional fuel filter 600-319-3440 Cartridge - 1 Every 500 hours service
Hydraulic tank breather 20Y-60-21470 Element - 1 Every 500 hours service
Main corrosion resistor 600-411-1171 Cartridge - 1 Every 1000 hours service
Sub corrosion resistor 600-411-1511 Cartridge - 1 Every 1000 hours service
07063-51054 Element 1
Charge filter - Every 1000 hours service
(07000-02110) (O-ring) (1)
207-60-71181 Element 1
Hydraulic oil filter - Every 2000 hours service
(07000-05195) (O-ring) (2)
600-185-6100 Element Ass'y - 2 -
Air cleaner
600-185-6110 Outer element - 2 -
195-71-11654 Cutting edge 1
17M-71-21550 Cutting edge 2
(195-71-52280) (Bolt) (21)
(01643-22460) (Washer) (21)
(17M-71-21530) (Nut) (21)
Blade - -
17M-71-21930 End bit (left) 1
17M-71-21940 End bit (right) 1
(195-71-52280) (Bolt) (14)
(01643-22460) (Washer) (14)
(17M-71-21530) (Nut) (14)
17M-78-21330 Protector 3
Ripper
195-78-21331 Point - 3 -
(variable multi ripper)
(09244-02508) (Pin) (9)
17M-78-21330 Protector 1
Ripper
195-78-21331 Point - 1 -
(variable giant ripper)
(09244-02508) (Pin) (3)
NOTICE
When handling parts that weigh more than 25 kg (55 lb), remember that they are heavy objects, and take the necessary care.
4-9
.
RECOMMENDED FUEL, COOLANT, AND LUBRICANT MAINTENANCE
RECOMMENDED FUEL, COOLANT, AND LUBRICANT

Komatsu genuine oils are adjusted to maintain the reliability and durability of Komatsu construction equipment
and components.
In order to keep your machine in the best conditioner for long periods of time, it is essential to follow the
instructions in this Operation and Maintenance Manual.
Failure to follow these recommendations may result in shortened life or excess wear of the engine, power train,
cooling system, and/or other components.
Commercially available lubricant additives may be good for the machine, but they may also cause harm.
Komatsu does not recommend any commercially available lubricant additive.
Use the oil recommended according to the ambient temperature in the chart below.
Specified capacity means the total amount of oil including the oil in the tank and the piping. Refill capacity means
the amount of oil needed to refill the system during inspection and maintenance.
When starting the engine in temperatures below 0°C (32°F), be sure to use the recommended multi-grade oil,
even if the ambient temperature may become higher during the course of the day.
If the machine is operated at a temperature below -20°C (-4°F), a separate device is needed, so consult your
When the fuel sulfur content is less than 0.5%, change the engine oil according to the period inspection table
given in this Operation and Maintenance Manual.
If the fuel sulfur content is more than 0.5%, change the oil according to the following table.
Fuel sulfur content Engine oil change interval

0.5 to 1.0% 1/2 of regular interval
Above 1.0% 1/4 of regular interval
4 - 10
.
MAINTENANCE RECOMMENDED FUEL, COOLANT, AND LUBRICANT
USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE
SAE: Society of Automotive Engineers

ASTM: American Society of Testing and Material
API: American Petroleum Institute
4 - 11
.
RECOMMENDED FUEL, COOLANT, AND LUBRICANT MAINTENANCE
Power train oil pan Final Cooling

Engine system
(incl. transmission, Damper drive Hydraulic Fuel
oil
torque converter and case case system tank Main Sub
pan
bevel gear casses) (each) circuit circuit
Specified liter 55 150 1.5 40 270 840 110 20

amount US gal 14.53 39.63 0.40 10.57 71.33 221.93 29.06 5.28
Refil liter 50 90 1.5 40 130 - - -

capacity US gal 13.21 23.78 0.40 10.57 34.35 - - -
NOTICE
Use only diesel fuel.
The engine mounted on this machine employs electronic control and a high-pressure fuel injection device to obtain good fuel
consumption and good exhaust gas characteristics. For this reason, it requires high precision for the parts and good lubrication.
If kerosene or other fuel with low lubricating ability is used, there will be a big drop in durability.
Note 1: SAE0W30EOS and SAE5W40EOS must be fully synthetic and HTHS ( High-Temperature High-Shear
Viscosity 150°C) must be equal to or higher than 3.5 cP. Komatsu EOS0W30 and EOS5W40 are the most
suitable oils. If these oils are not available, follow the instruction "RECOMMENDED BRANDS,
RECOMMENDED QUALITY FOR PRODUCTS OTHER THAN KOMATSU GENUINE OIL (PAGE 4-12)"
at the end of this chapter.
Note 2: Powertrain oil has different properties from engine oil. Be sure to use the recommended oils.
Note 3: Hyper grease (G2-T, G2-TE) has a high performance.

When it is necessary to improve the lubricating ability of the grease in order to prevent squeaking of pins and
bushings, the use of G2-T or G2-TE is recommended.
Note 4: Supercoolant (AF-NAC)

1) Coolant has the important function of anticorrosion as well as antifreeze.
2) For details of the ratio when diluting super coolant with water, see "CLEAN INSIDE OF COOLING SYSTEM
(PAGE 4-20)".
When the machine is shipped from the factory, it may be filled with coolant containing 30% or more Supercoolant
(AF-NAC). In this case, no adjustment is needed for temperatures down to -10°C (14°F). (never dilute with water)
3) To maintain the anticorrosion properties of Supercoolant (AF-NAC), always keep the density of Supercoolant
between 30% and 68%.
RECOMMENDED BRANDS, RECOMMENDED QUALITY FOR PRODUCTS OTHER THAN

KOMATSU GENUINE OIL
When using commercially available oils other than Komatsu genuine oil, or when checking the latest specifications,
refer to the Komatsu web page or consult your Komatsu distributor.
4 - 12
.
MAINTENANCE STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS

TORQUE LIST
CAUTION
If nuts, bolts, or other parts are not tightened to the specified torque, it will cause looseness or damage to the tightened parts, and
this will cause failure of the machine or problems with operation.
Always pay careful attention when tightening parts.
Unless otherwise specified, tighten the metric nuts and bolts to the torque shown in the table below.
If it is necessary to replace any nut or bolt, always use a Komatsu genuine part of the same size as the part that was
replaced.
Thread Width Tightening torque

diameter across
Target value Service limit
of bolt flats
(a)(mm) (b)(mm) N·m kgf·m lbft N·m kgf·m lbft
6 10 13.2 1.35 9.8 11.8-14.7 1.2-1.5 8.7-10.8

8 13 31 3.2 23.1 27-34 2.8-3.5 20.3-25.3
10 17 66 6.7 48.5 59-74 6.0-7.5 43.4-54.2
12 19 113 11.5 83.2 98-123 10.0-12.5 72.3-90.4
14 22 172 17.5 126.6 153-190 15.5-19.5 112.1-141
16 24 260 26.5 191.7 235-285 23.5-29.5 170.0-213.4

18 27 360 37 267.6 320-400 33.0-41.0 238.7-296.6
20 30 510 52.3 378.3 455-565 46.5-58.0 336.3-419.5
22 32 688 70.3 508.5 610-765 62.5-78.0 452.1-564.2
24 36 883 90 651 785-980 80.0-100.0 578.6-723.3
27 41 1295 132.5 958.4 1150-1440 118.0-147.0 853.5-1063.3

30 46 1720 175.0 1265.8 1520-1910 155.0-195.0 1121.1-1410.4
33 50 2210 225.0 1627.4 1960-2450 200.0-250.0 1446.6-1808.3
36 55 2750 280.0 2025.2 2450-3040 250.0-310.0 1808.3-2242.2
39 60 3280 335.0 2423.1 2890-3630 295.0-370.0 2133.7-2676.2
Apply the following table for Hydraulic Hose.
Width
Nominal- across Tightening torque (N·m (kgf·m, lbft))
No. of flats
threads (a) (b) Target valve Parmissible range
mm
9/16 -18UNF 19 44 (4.5, 32.5) 35 - 54 (3.5 - 5.5, 25.3 - 39.8)
11/16 -16UN 22 74 (7.5, 54.2) 54 - 93 (5.5 - 9.5, 39.8 - 68.7)
13/16 -16UN 27 103 (10.5, 75.9) 84 - 132 (8.5 - 13.5, 61.5 -97.6)
1 -14UNS 32 157 (16.0, 115.7) 128 - 186 (13.0 - 19.0, 94.0 - 137.4)
1·3/16 -12UN 36 216 (22.0, 159.1) 177 - 245 (18.0 - 25.0, 130.2 - 180.8)
4 - 13
.
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS MAINTENANCE
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS

For using the machine safely for an extended period if time, you are required to periodically replace the safety
(critical and fire prevention) related parts listed in the table of important parts on the following page.
Material quality of these parts can change as time passes and they are likely to wear out or deteriorate. However,
it is difficult to determine the extent of wear or deterioration at the time of periodic maintenance. Hence, it is required
to replace them with new ones regardless of their condition after a certain period of usage. This is important to
ensure that these parts maintain their full performance at all times.
Furthermore, should anything abnormal be found on any of these parts, replace it with a new one even if the periodic
replacement time for the part has not yet arrived.
If any of the hose clamps show deterioration like deformation or cracking, replace the clamps at the same time as
the hoses.
Also perform the following checks with hydraulic hoses which need to be replaced periodically. Tighten all loose
clamps and replace defective hoses, as required.
When replacing hoses, always replace O-rings, gaskets, and other such parts at the same time.
Have your Komatsu distributor replace the critical parts.
4 - 14
.
MAINTENANCE PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS
SAFETY CRITICAL PARTS

No. Safety critical parts for periodic replacement Q'ty Replacement interval
1 Fuel hose (nozzle - fuel return hose) 1
2 Fuel hose (scavenging pump - fuel return hose) 1
3 Fuel hose (fuel tank - fuel strainer) 1
4 Fuel hose (fuel strainer - scavenging pump) 1
5 Fuel hose (hand priming pump - supply pump) 1
6 Hose (Torque converter oil cooler - power train assembly) 2
7 Hose (Power train pump - transmission filter / steering filter) 2
8 Hose (Transmission filter - power train assembly) 1
9 Hose (Steering filter - power train assembly) 1
10 Inspection hose assembly for power train pressure 1
11 Hose (HSS charge pump - HSS charge filter) 1
12 Hose (HSS charge filter - HSS pump) 1
13 Hose (HSS charge filter - HSS motor) 1
14 Hose (HSS pump - central drain block) 1
15 Hose (HSS pump - central drain block) 1
16 Hose (central drain block - Hydraulic tank) 2
17 Hose (HSS pump - HSS motor) 2 Every 2 years
18 Hose (self-reducing pressure valve - HSS pump) 1 or 4000 hours,
19 Hose (HSS pump - pivot turn valve) 1 whichever comes sooner
20 Hose (pivot turn valve - HSS motor) 1
21 Hose (pivot turn valve - drain relay block) 1
22 Hose (HSS motor - oil cooler bypass valve) 1
23 Hose (oil cooler bypass valve - hydraulic oil cooler) 2
24 Hose (fan pump - relay tube) 1
25 Hose (relay tube - fan motor) 2
26 Hose (fan motor - hydraulic tank) 4
27 Hose (self-reducing pressure valve - PPC lock valve) 2
28 Hose (PPC lock valve - blade PPC lock valve) 1
29 Hose (PPC lock valve - ripper PPC valve) 1
30 Hose (blade PPC valve - main control valve) 4
31 Hose (ripper PPC valve - main control valve) 4
32 Hose (blade PPC valve - hydraulic tank) 1
33 Hose (ripper PPC valve - hydraulic tank) 1
34 Hose (hydraulic pump - main control valve) 3
35 Hose (main control valve - ripper relay block) 4
36 Hose (main control valve - hydraulic tank) 1
37 Hose (ripper relay block - ripper cylinder) 8
38 Hose (main control valve - blade tilt relay tube) 4 Every 2 years
39 Hose (main control valve - blade relay tube) 2 or 4000 hours,
40 Hose (blade relay tube - blade divider block) 2 whichever comes sooner
41 Hose (radiator guard top - lift cylinder) 2
42 Injector assembly 1S
43 Seat belt 1 Every 3 years
44 High-pressure tube clamp 1S
Every 8000 hours
45 Fuel spray prevention cap 1S
4 - 15
.
MAINTENANCE SCHEDULE CHART MAINTENANCE
MAINTENANCE SCHEDULE CHART

MAINTENANCE SCHEDULE CHART
INITIAL 250 HOURS SERVICE (ONLY AFTER THE FIRST 250 HOURS)
CHANGE OIL IN ENGINE OIL PAN, REPLACE ENGINE OIL FILTER CARTRIDGE AND BYPASS
FILTER CARTRIDGE 4- 52
REPLACE POWER TRAIN OIL FILTER ELEMENT, STEERING LUBRICATING OIL FILTER
ELEMENT 4- 55
CHANGE OIL IN POWER TRAIN CASE, WASH STRAINERS (POWER TRAIN PUMP STRAINER,
SCAVENGING PUMP STRAINER) 4- 61
REPLACE CHARGE FILTER ELEMENT 4- 65
CHANGE OIL IN HYDRAULIC TANK, REPLACE HYDRAULIC OIL FILTER ELEMENT, CLEAN
HYDRAULIC TANK STRAINER 4- 66
CHANGE OIL IN FINAL DRIVE CASE 4- 68
WHEN REQUIRED
CLEAN INSIDE OF COOLING SYSTEM 4- 20
CHECK, CLEAN AND REPLACE AIR CLEANER ELEMENT 4- 24
CHECK TRACK TENSION 4- 26
CHECK AND TIGHTEN TRACK SHOE BOLTS 4- 28
ADJUST IDLER CLEARANCE 4- 29
REVERSE AND REPLACE THE END BITS AND CUTTING EDGES 4- 30
CLEAN, CHECK RADIATOR FINS 4- 32
CLEAN FUEL TANK STRAINER 4- 33
DRAIN WATER AND SEDIMENT IN FUEL TANK 4- 33
CLEAN STEERING CLUTCH CASE BREATHER 4- 33
REPLACE AIR CONDITIONER BELT 4- 33
CLEAN, CHECK HYDRAULIC COOLER FINS 4- 34
CHECK UNDERCARRIAGE OIL 4- 35
CLEAN AIR CONDITIONER AIR FILTER (FRESH/RECIRC FILTER) 4- 36
CHECK, ADJUST AIR CONDITIONER 4- 37
LUBRICATE DOOR HINGE 4- 38
CHECK DOOR LATCH 4- 38
CHECK DOOR LOCK STRIKER 4- 39
REPLACE DOOR DAMPER 4- 39
CHECK WINDOW WASHER FLUID LEVEL, ADD FLUID 4- 39
REPLACE WIPER BLADE 4- 40
BLEED AIR FROM HEAD END OF RIGHT PITCH CYLINDER 4- 41
BLEEDING AIR IN HYDRAULIC SYSTEM 4- 41
CHECK ELECTRICAL INTAKE AIR HEATER 4- 41
LUBRICATING 4- 42
4 - 16
.
MAINTENANCE MAINTENANCE SCHEDULE CHART
EVERY 250 HOURS SERVICE

LUBRICATING 4- 44
CHECK ALTERNATOR DRIVE BELT TENSION, ADJUST 4- 46
CHECK LEVEL OF BATTERY ELECTROLYTE 4- 47
CHECK BRAKE PERFORMANCE 4- 50
CHECK OIL LEVEL IN DAMPER CASE, ADD OIL 4- 51

CHANGE OIL IN ENGINE OIL PAN, REPLACE ENGINE OIL FILTER CARTRIDGE AND BYPASS
FILTER CARTRIDGE 4- 52
REPLACE FUEL FILTER CARTRIDGE (MACHINES EQUIPPED WITHOUT ADDITIONAL FUEL
FILTER CARTRIDGE) 4- 53
REPLACE POWER TRAIN OIL FILTER ELEMENT, STEERING LUBRICATING OIL FILTER
ELEMENT 4- 55
CHECK OIL LEVEL IN FINAL DRIVE CASE, ADD OIL 4- 56
REPLACE HYDRAULIC TANK BREATHER ELEMENT 4- 56
REPLACE ADDITIONAL FUEL FILTER CARTRIDGE (IF EQUIPPED WITH MACHINES) 4- 57

REPLACE FUEL FILTER CARTRIDGE (MACHINES EQUIPPED WITH ADDITIONAL FUEL FILTER
CARTRIDGE) 4- 59
CHANGE OIL IN POWER TRAIN CASE, WASH STRAINERS (POWER TRAIN PUMP STRAINER,
SCAVENGING PUMP STRAINER) 4- 61
CHECK, CLEAN FUEL STRAINER 4- 63
CHECK FOR LOOSE ROPS MOUNT BOLTS 4- 63
REPLACE MAIN CORROSION RESISTOR CARTRIDGE AND SUB CORROSION RESISTOR
CARTRIDGE 4- 64
CHECK TIGHTENING PARTS OF TURBOCHARGER 4- 64
REPLACE CHARGE FILTER ELEMENT 4- 65

CHANGE OIL IN HYDRAULIC TANK, REPLACE HYDRAULIC OIL FILTER ELEMENT, CLEAN
HYDRAULIC TANK STRAINER 4- 66
CHANGE OIL IN FINAL DRIVE CASE 4- 68
CHANGE OIL IN DAMPER CASE, CLEAN DAMPER BREATHER 4- 69
CHECK PIVOT BEARING OIL LEVEL, ADD OIL 4- 70
CHECK OIL LEVEL IN RECOIL SPRING, ASSIST CYLINDER CASE, ADD OIL 4- 71
CLEAN ENGINE BREATHER ELEMENT 4- 71
CHECK ALTERNATOR, STARTING MOTOR 4- 71
CHECK INJECTOR 4- 72
4 - 17
.
MAINTENANCE SCHEDULE CHART MAINTENANCE

CHECK WATER PUMP 4- 73
CHECK VIBRATION DAMPER 4- 73
CLEAN, CHECK TURBOCHARGER 4- 73
CHECK PLAY OF TURBOCHARGER ROTOR 4- 73
CHECK ENGINE VALVE CLEARANCE, ADJUST 4- 73
CHECKING FOR LOOSENESS OF HIGH-PRESSURE CLAMP, HARDENING OF RUBBER 4- 74
CHECKING FOR MISSING FUEL SPRAY PREVENTION CAP, HARDENING OF RUBBER 4- 75
REPLACE INJECTOR ASSEMBLY 4- 75
CHECK MAIN FRAME, WORK EQUIPMENT (BLADE, RIPPER) 4- 76

REPLACE HIGH-PRESSURE PIPING CLAMP 4- 77
REPLACE FUEL SPRAY PREVENTION CAP 4- 77
4 - 18
.
MAINTENANCE SERVICE PROCEDURE
SERVICE PROCEDURE
INITIAL 250 HOURS SERVICE (ONLY AFTER THE FIRST 250 HOURS)
Perform the following maintenance only after the first 250 hours.
Change oil in engine oil pan, replace engine oil filter cartridge
Replace power train oil filter element, steering lubricating oil filter element
Change oil in power train case, wash strainers (power train pump strainer, scavenging pump strainer)
Replace charge filter element
Change oil in hydraulic tank, replace hydraulic oil filter element, clean hydraulic tank strainer
Change oil in final drive case
For details of the method of replacing or maintaining, see the section on EVERY 500 HOURS, 1000 HOURS and
2000 HOURS SERVICE.
4 - 19
.
SERVICE PROCEDURE MAINTENANCE
WHEN REQUIRED
CLEAN INSIDE OF COOLING SYSTEM
WARNING
Immediately after the engine is stopped, the coolant is at a high temperature and the radiator is under high internal pressure.
If the cap is removed to drain the coolant in this condition, there is a hazard of burns. Wait for the temperature to go down, then
turn the cap slowly to release the pressure before removing it.
Cleaning is carried out with the engine running. When standing up or leaving the operator's seat, set the work equipment lock
lever and the parking lever to the LOCK position.
For details of starting the engine, see "CHECK BEFORE STARTING ENGINE, ADJUST (PAGE 3-68)" and "STARTING ENGINE
(PAGE 3-87)" in the OPERATION section.
Never enter front the machine when the engine is running.
There is danger of touching the fan.
Clean the inside of the cooling system, change the coolant and replace the corrosion resistor according to the table
below.
Interval of cleaning inside of cooling system

Antifreeze coolant Replacing corrosion resistor
and changing antifreeze coolant
Komatsu supercoolant Every two years or every 4000 hours

(AF-NAC) whichever comes first Every 1000 hours
and when cleaning the inside
of the cooling system
Permanent type antifreeze Every year (autumn) or every 2000 hours and when changing coolant.
(All-season type, *) whichever comes first.
*: Permanent type antifreeze shall meet the requirements of ASTM D3306-03.
Stop the machine on level ground when cleaning or changing the coolant.
The coolant has the important function of preventing corrosion as well as preventing freezing.
To maintain the anticorrosion properties of Supercoolant (AF-NAC), always keep the density of Supercoolant
between 30% and 68%.
4 - 20
.
When deciding the ratio of antifreeze to water, check the lowest temperature in the past, and decide from the mixing
table given below.
It is actually better to estimate and temperature about 10°C (18°F) lower when deciding the mixing ratio.
The mixing ratio depends on the ambient temperature, but it should always be a minimum of 30% by volume
(antifreeze/total amount of coolant x 100).
The freezing temperature of undiluted antifreeze is -15°C (5°F). Do not store undiluted antifreeze at a temperature
of below -15°C (5°F).
Mixing rate of water and antifreeze
Min.atmospheric °C Above -10 -15 -20 -25 -30

temperature °F Above 14 5 -4 -13 -22
Liters 39.0 46.7 53.2 59.7 65.0
Amount of antifreeze
US gal 10.30 12.34 14.06 15.77 17.17
Liters 91.0 83.3.1 76.8 70.3 65.0
Amount of water
US gal 24.04 22.01 20.29 18.57 17.17
Volume ratio (%) % 30 36 41 46 50
WARNING
Antifreeze is flammable, so keep it away from flame.
Antifreeze is toxic. When removing the drain plug, be careful not to get water containing antifreeze on you. If it gets in your eyes,
flush your eyes with large amount of fresh water and see a doctor at once.
Use antifreeze and appropriate water for diluting. (for details, see "COOLANT AND WATER FOR DILUTION (PAGE
4-6)")
We recommend use of an antifreeze density gauge to control the mixing proportions.
Prepare a container whose capacity is larger than the specified coolant volume to catch drained coolant.
Prepare a hose to supply antifreeze coolant and water.
1. Stop the engine, wait for the coolant to cool completely, then
turn valve (3) of main corrosion resistor (1) and sub corrosion
resistor (2) to the Close stopper position.
4 - 21
.
2. Turn main radiator cap (4) and sub radiator cap (5) slowly, and
remove.
3. Prepare a container to catch the coolant, pull out hose (6) of the
main radiator at the bottom front right of the machine, then
open drain valve (7) and drain the water.
The sub radiator is at the bottom front left of the machine. Pull
out drain hose (8) in the same way, then open drain valve (9)
and drain the water.
4. Open the drain valve (11) in the water pump piping on the right
side of the engine, and drain the coolant.
5. After draining the antifreeze solution, close drain valve (7), (9)
and (11), then fill with clean water. After the radiator is filled with
water, start and run the engine at low idling speed. After the
water temperature rises above 90°C (194°F), run the engine
for about 10 minutes.
6. Stop the engine, open drain valve (7), (9) and (11), and drain
the water.
7. After draining the water, clean the cooling system with cleaning
agent.
For the cleaning method, see the instructions for the cleaning
agent.
8. Close drain valve (7), (9) and (11).
9. Replace the corrosion resistor, then open each valve (3).

For details of the procedure for replacing the corrosion resistor, see "REPLACE MAIN CORROSION
RESISTOR CARTRIDGE AND SUB CORROSION RESISTOR CARTRIDGE (PAGE 4-64)".
10. Add coolant mixed with antifreeze until it overflows from the water filler.
Decide the proportions of antifreeze and water according to the table for the mixing rate of water and antifreeze.
11. To bleed the air from the cooling system, run the engine at low idling for 5 minutes, and for a further 5 minutes
at high idling. (When doing this, leave the radiator cap off.)
4 - 22
.
12. Drain the coolant from sub-tank (10), clean the inside of the
sub-tank, then add water until the coolant level is between the
FULL and LOW marks.
13. Stop the engine, wait for approx. 3 minutes, then add coolant
until the coolant level is near the coolant filler port, and tighten
the cap. Check the coolant level and add coolant if necessary.
4 - 23
.
CHECK, CLEAN AND REPLACE AIR CLEANER ELEMENT
WARNING
Always wear protective glasses, dust mask, or other protective equipment.
When removing the air cleaner element from the air cleaner body, it is dangerous to pull it out by force.
When working at high places or where the foothold is poor, be careful not to fall because of the reaction when pulling out the
outer element.
CHECKING
If the internal yellow piston overlaps the red zone on the outside
diameter of dust indicator (1), clean the air cleaner element.
After cleaning, press the reset button to reset the piston.
NOTICE
Always wait for the yellow piston in the dust indicator to overlap the red
zone on the outside before cleaning the element.
If the element is cleaned frequently before the yellow piston in the dust
indicator overlaps the red zone on the outside, the air cleaner will be
unable to display its normal performance and the cleaning effect will
become poor.
In addition, the frequency of dust stuck to the element falling inside the
inner element during the cleaning operation will increase.
CLEANING OR REPLACING OUTER ELEMENT

NOTICE
Before and after cleaning the element, do not leave or keep it in direct
sunlight.
1. Remove 6 holders (2), then remove cover.

2. Hold the outer element, rock it lightly up and down and to the
left and right, and rotate the element to the left and right to pull
it out.
NOTICE
Never remove the inner element. It will allow dirt to enter and cause
failure of the engine.
Do not use a screwdriver or other tool.
3. Use a clean cloth or brush to remove the dirt stuck to the cover and the inside of the air cleaner body.
4 - 24
.
4. Direct dry compressed air (Max. 0.69 MPa (7 kgf/cm2, 99.4

PSI)) from the inside of the outer element along its folds. Then
direct the compressed air from the outside along the folds, and
again from the inside.
1) Check that the inner element is not loose. If it is loose,
insert it securely.
2) If the yellow piston overlaps the outer element red zone
immediately after the outer element is cleaned, replace the
inner and outer elements.
5. If small holes or thinner parts are found on the element when
it is checked with an electric bulb after cleaning and drying,
replace the element.
NOTICE
Do not use an element whose folds or gasket or seal are damaged.
When cleaning the element, do not hit it or beat it against something.
6. Set the cleaned outer element in position, then secure cover

with mounting holders (2).
7. After replacing the element, press the dust indicator button to

reset it.
The yellow piston will return to its original position.
REPLACING INNER ELEMENT

1. First remove the outer element, and then remove the inner element.
2. Cover the air connector side (outlet side) with a clean cloth or tape.
3. Clean the air cleaner body interior, then remove the cover installed in Step 2.
4. Fit a new inner element to the connector.
Do not clean and reinstall an inner element.
5. Install the outer element and the cover.
6. After replacing the element, press the dust indicator button to
reset it.
The yellow piston will return to its original position.
4 - 25
.
CHECK AND ADJUST TRACK TENSION

The wear of pins and bushings on the undercarriage will vary with the working conditions and types of soil. It is thus
necessary to continually inspect the track tension so as to maintain the standard tension.
Carry out the check and adjustment under the same conditions as when operating (on jobsites where the track
becomes clogged with mud, measure with the track clogged with mud).
INSPECTION
Stop the machine on level ground (stop with the transmission in
FORWARD without applying the brake). Then place a straight bar
on the track shoes between the carrier roller and the idler as shown
in the figure, and measure the clearance between the bar and the
grouser at the midpoint. If the clearance (A) is 20 to 30 mm (0.79
to 1.18 in), the tension is standard.
If the track tension is not at the standard value, adjust it in the
following manner.
ADJUSTMENT
WARNING
Grease inside the adjusting mechanism is under high pressure.
Grease coming from plug (4) under pressure can penetrate the body
causing injury or death. For this reason, do not loosen plug (4) more than
one turn. Do not loosen any part other than plug (4). Furthermore, do not
bring your face in front of the grease fitting.
If track tension is not relieved by this procedure, contact your Komatsu
WHEN INCREASING TENSION

1. First remove the bolt (1) and then remove the cover (2).
NOTICE
When removing cover (2), be careful not to let soil get in.
There is a safety label stuck to the back of cover (2). Be careful not to damage the safety label.
2. Pump in grease through the grease fitting (3) with a grease pump.
3. To check that the correct tension has been achieved, move the machine backwards and forwards.
4. Check the track tension again, and if the tension is not correct, adjust it again.
4 - 26
.
5. Continue to pump in grease until S becomes 475 mm (18.7 in).

If the tension is still loose, the pin and bushing are excessively
worn, so they must be either turned or replaced. Please
contact your Komatsu distributor.
WHEN LOOSENING TENSION
WARNING
It is extremely dangerous to release the grease by any method except the procedure given below.
If track tension is not relieved by this procedure, contact your Komatsu distributor for repairs.
1. Remove both bolts (1), then remove cover (2).
NOTICE
When removing cover (2), be careful not to let any dirt get inside.
There is a safety label stuck to the back of cover (2). Be careful not to damage the safety label.
2. Loosen plug (4) gradually to release the grease.

3. Turn plug (4) a maximum of one turn.
4. If the grease does not come out smoothly, move the machine
backwards and forwards a short distance.
5. Tighten plug (4).
6. To check that the correct tension has been achieved, move the
machine backwards and forwards.
7. Check the track tension again, and if the tension is not correct,
adjust it again.
4 - 27
.
WHEN REMOVING TRACK
WARNING
Depending on the situation, the operation to remove the track may be extremely dangerous.
Before removing the track, if the procedure "WHEN LOOSENING TENSION (PAGE 4-27)" does not loosen the track tension, contact
your Komatsu distributor for repairs.
CHECK AND TIGHTEN TRACK SHOE BOLTS

If the machine is used with track shoe bolts being loose, they will break, so tighten any loose bolts immediately.
METHOD OF TIGHTENING SHOE BOLT

1. First tighten to a tightening torque of 490 ± 49 N·m (50 ± 5 kgf·m, 361.7 ± 36.2 lbft) then check that the nut and
shoe are in close contact with the link contact surface.
2. After checking, tighten a further 180° ± 10°.
METHOD OF TIGHTENING MASTER LINK CONNECTING BOLT

1. First tighten to a tightening torque of 490 ± 49 N·m (50 ± 5 kgf·m, 361.7 ± 36.2 lbft) then check that the link
contact surfaces are in close contact.
2. After checking, tighten a further 180° ± 10°.
ORDER FOR TIGHTENING

Tighten the bolts in the order shown in the diagram on the right.
4 - 28
.
ADJUST IDLER CLEARANCE

The idler moves forward and backward under external pressure
when this happens, side guide (1) and guide plate (2) become
worn.
As they become worn, there is side play in the idler, or the idler
turns at an angle, causing the track to come off or resulting in
uneven wear, so adjust as follows.
ADJUSTMENT
1. Drive the machine for 8 to 12 m (24.4 to 36.6 ft) on flat ground,
then measure clearance A (4 places: left, right, inside outside)
between the track frame and side guide (1).
2. If clearance A is more than 3 mm (0.1 in), remove bolt (3), then
take out shim (4), and adjust to that the clearance on one side
is less than 0.5 mm (0.02 in).
REMARK
There are two types of shim (thickness: 0.5 mm (0.02 in) and 1.0
mm (0.04 in).
4 - 29
.
REVERSE AND REPLACE THE END BITS AND CUTTING EDGES
WARNING
It is dangerous if the work equipment moves by mistake when the cutting edges and end bits are being reversed or replaced.
Set the work equipment in a stable condition, then stop the engine and lock the blade control lever securely with the work
equipment lock lever.
Reverse or replace the end bits and cutting edges before it is worn out to the blade end.
1. Raise the blade to a proper height, apply a block under the frame to prevent the blade from falling.
2. Operate the work equipment lock lever to the LOCK position.
If the cutting edge and the end bit on both sides are worn out, replace with new one.
If it has been worn out up to the fitting surface, repair the fitting surface and then reverse or replace.
3. Loosen nut (1) and remove bolt (2). Then remove the cutting
edge and the end bit and clean the mounting surface.
4. Reverse or replace the cutting edge and the end bit when worn
out.
If bolt (1) and nut (2) are damaged, replace them with new ones
at the same time.
5. Install the edge to the blade, then tighten partially. Drop the
blade three to five times on to the ground or rock to remove any
play in bolt (2), then tighten it to the correct tightening torque.
When installing end bit (3), put top surface (4) of the end bit in
close contact with stopper (5), then tighten with the bolts.
Tightening torque: 1499 ± 157 N·m (153 ± 16 kgf·m, 1106.6 ±
115.7 lbft)
6. After several hours of running, retourque the nuts.
REMARK
The tightening operation is easier if the power wrench that has
been supplied is used.
When the nut is rusted and is removed by gas cutting, cut on both
side (6) of the nut as shown in the diagram.
Be careful not to damage seat surface (7).
If it is damaged, repair it. Be careful not to get spatter on the
mounting surface.
4 - 30
.
METHOD OF USING POWER WRENCH

The power wrench set is equipped with a special socket.
This socket is designed to grip the nuts and prevent the wrench set
from pulling out. This means that tightening can be performed by
one worker.
This socket has a double construction, and is designed so that the
outside can rotate 30°
It is used as follows.
1. Align the hexagons of the inside socket and outside socket, the
insert the nut that is to be tightened or loosened.
2. After inserting the nut, turn the outside socket 30° clockwise.
When this is done, the outside socket will catch the notch in
the nut seat surface, and the wrench will not come off.
3. Put the reaction arm in contact with the blade rib, and tighten
or loosen.
4. Turn the outside socket counterclockwise, and remove the
wrench.
4 - 31
.
CLEAN AND CHECK RADIATOR FINS
WARNING
For the cleaning and check, stop the engine without fail and confirm that the fan is not rotating, and carry out the work.
When the radiator fins are blocked with mud, dirt, or debris, clean as follows.
1. Remove four bolts (1) at corners of grill (2), then open the grill.
2. Clean the radiator fins clogged with mud, dust and leaves with compressed air. Steam or water may be used
instead of compressed air.
REMARK
Check the hydraulic cooler hoses. If any hose is cracked or hardened by age, replace with a new hose. Also check
and tighten all loose hose clamps.
Run the fan in reverse to switch the direction of the air and clean the radiator fins between the main radiator and sub
radiator.
1) Remove bolts (1) at the four corners of the radiator fins,

then open radiator grill (2).
2) Turn screws (3) of the direction selector valve of the fan
motor until they contact the stopper (10 mm (0.4 in)).
3) Close radiator grill (2), then secure with bolts (1).
4) Start the engine and run the fan in reverse.
5) After completing the cleaning, return the screws of the
direction selector valve to their original positions.
4 - 32
.
CLEAN FUEL TANK STRAINER

Clean the strainer if there is any dirt collected in it.
Remove the filler cap (1) of the fuel tank and take out strainer.
If the strainer is dirty, clean it with diesel fuel.
DRAIN WATER AND SEDIMENT IN FUEL TANK

Carry out this procedure after the machine has been at rest for a
long time and after a long spell of rainy days.
Loosen valve (1) at the bottom of the tank and drain sediment
accumulated on the bottom together with mixed water and fuel.
CLEAN STEERING CLUTCH CASE BREATHER

1. Open the rear cover.
2. Remove bolts (1), then remove cover (2).
3. Remove breather (3) on the side of the hydraulic tank, remove
any dirt stuck to the breather, then wash with clean diesel oil or
flushing oil.
REPLACE AIR CONDITIONER BELT

1. Loosen 4 bolts (1) and jack bolt (2), then move compressor (3)
to the side.
2. Replace the V-belt.
When adjusting the V-belt, do not push the compressor
directly with the bar. Use jack bolt (2).
3. Tighten jack bolt (2) and bolts (1), and apply tension to the
V-belt. The standard deflection for the belt is approx. 10 mm
(0.4 in) when pressed with a finger force of approx. 6 kg at a
point midway between the air conditioner compressor pulley
and fan pulley.
4 - 33
.
CLEAN AND CHECK HYDRAULIC COOLER FINS

If the hydraulic cooler fins are clogged or there is dirt caught in the
fins, clean and check the fins.
1. Open the inspection cover on the right.
2. Use compressed air to remove the mud, dirt, and leaves
clogging the hydraulic cooler fins. Steam or water may be used
instead of compressed air.
REMARK
Check the hydraulic cooler hoses. If any hose is cracked or hardened by age, replace with a new hose. Also check
and tighten all loose hose clamps.
4 - 34
.
CHECK UNDERCARRIAGE OIL

Stop the machine on level ground, and check for any reduction in
the oil at the idler (portion P), track roller (portion Q), and carrier
roller (portion R).
1. Loosen seal bolt (1) slowly and check if oil oozes out from the
thread. If oil oozes out, the oil level has not gone down, so
tighten the bolt.
2. If no oil comes out even when seal bolt is removed, the oil level
is low. Contact your Komatsu distributor for repairs.
REMARK
Bogie shaft seal bolt (1) is located on both the inside and outside.
4 - 35
.
CLEAN AIR CONDITIONER AIR FILTER (FRESH/RECIRC FILTER)

Clean the air conditioner air filter if it becomes clogged or if there is
dirt or oil stuck to it.
1. Open inspection cover (1) on the top of the left engine cover,
then remove fresh air filters (2).
2. Open inspection cover (3) under the front panel and pull up
recirculation air filter (4) to remove it.
3. Clean filters (2) and (4) with compressed air. If there is oil stuck
to the filter, or it is extremely dirty, wash it in a neutral agent.
After washing it, dry it completely before installing it again.
REMARK
If the filters cannot be cleaned with air or in water, replace them
with new ones.
4 - 36
.
CHECK AND ADJUST AIR CONDITIONER
CHECK TENSION OF COMPRESSOR BELT

If the belt is loose, it will slip and the cooling effect will be reduced.
From time to time, press a point midway between the drive pulley
and compressor pulley with your finger (approx. 58.8 N (6 kgf)) and
check that the tension is 15 to 18 mm (0.6 to 0.7 in).
When the belt is new, there will be initial elongation, so always
adjust again after 2 or 3 days.
CHECK LEVEL OF REFRIGERANT(GAS)
WARNING
When handling refrigerant gas, always follow local laws and
regulations.
The refrigerant used in the cooler is colorless and odorless and does
not harm the atmosphere, but if the liquid gets into your eyes or on your
hands, it may cause loss of sight or frostbite, so never loosen any part
of the refrigerant circuit.
If the level of the refrigerant (gas) is low, the cooling effect will be
reduced. Run the engine at high idling, and check the flow of the
refrigerant in the refrigerant circuit through the sight glass of the
receiver (1) when the cooler is running at high speed.
No bubbles in refrigerant flow: Suitable
Some bubbles in flow
(bubbles pass continuously): Lack of refrigerant
Colorless, transparent: No refrigerant
REMARK
When there are bubbles, the refrigerant gas level is low, so
contact your refrigerant dealer to have refrigerant added. If the
air conditioner is run with the refrigerant gas level low, it will
cause damage to the compressor.
New Freon R134a is used as the refrigerant.
4 - 37
.
LUBRICATE DOOR HINGE

If the door makes a squeaking noise when it is opened or closed,
spray lubricant in through the split in the hinge bushing.
If the bushing is worn, replace the hinge.
CHECK DOOR LATCH
WARNING
If the control lever is touched by accident during checking, the machine
moves off suddenly, and this may lead to serious injury or death.
Before checking door latch, stop the engine and set the parking lever
securely to the LOCK position.
Check
Hold the door open-locked, and check that there is still grease
inside the latch. If the amount of grease is low or there is no more
grease, coat the inside of the latch with grease from portion (1).
REMARK
If there is no more grease inside the latch, the movement will
become poor because of dust inside the latch, and the handle may
be stiff when opening the door.
4 - 38
.
CHECK DOOR LOCK STRIKER

If the wear of the door lock striker exceeds 0.5 mm (0.02 in),
replace the striker. If it is used at it is, the play will increase and this
may result in breakage of the hinge or door lock.
REPLACE DOOR DAMPER

If the depth of the door damper rubber groove is less than 2 mm
(0.08 in), replace the damper.
There are two dampers each at the top and bottom on the left and
right doors.
CHECK WINDOW WASHER FLUID LEVEL, ADD FLUID

If there is air in the window washer fluid, check the level and add
fluid.
Open the battery cover, check the level of the fluid in window
washer tank (1), and if it is low, add automobile window washer
fluid.
When adding fluid, be careful not to let any dust get in.
4 - 39
.
REPLACE WIPER BLADE

If the blade is damaged, it will not wipe the window clean, so
replace the blade.
REPLACEMENT
FRONT, REAR WIPER

1. Remove screw (1), then remove the blade.
2. Install a new blade, then tighten screw (1) securely.
REAR WIPER
1. Remove E-ring (1).
The blade can then be removed.
2. Install a new blade, then install securely with E-ring (1).
DOOR WIPER
1. It is hooked at portion (A), so move the blade in the direction of
the arrow to remove it.
2. Install the new blade and hook it securely.
4 - 40
.
BLEED AIR FROM HEAD END OF RIGHT PITCH CYLINDER

(DUAL TILT DOZER ONLY)
Bleed the air if the work equipment has been removed or repaired.
1. Raise the blade and run the engine at low idling.
2. Operate the left and right tilt 5 to 10 times to bleed the air from the tilt circuit.
3. Operate the forward and rear pitch 5 to 10 times to bleed the air from the bottom end of the right cylinder.
4. Set the left and right cylinders at the neutral position, then carry out the following operations 5 - 10 times to bleed
the air from the head end of the right pitch cylinder.
(1) Forward pitch → (2) Left tilt → (3) Right tilt → (4) Rear pitch
BLEEDING AIR IN HYDRAULIC SYSTEM

See "OPERATIONS AND CHECKS AFTER STARTING ENGINE (PAGE 3-90)".
Since the engine must be started and the blade must be operated, see OPERATION.
NOTICE
If the engine is run at high speed immediately after startup or a cylinder is pushed up to its stroke end, air taken inside the cylinder
may cause damage to the piston packing.
1. Bleeding air from cylinders
1) Run the engine at low idling, and extend and retract each cylinder 4 to 5 times, taking care so that a cylinder
may not be brought up to its stroke end. (Stop the cylinder approx. 100 mm (3.9 in) short of its stroke end)
2) Next, operate each cylinder 3 to 4 times to the end of its stroke.
3) Finally, operate each cylinder 4 to 5 times to the end of its stroke to completely remove the air.
CHECK ELECTRICAL INTAKE AIR HEATER

Check before the cold season starts (once a year).
Remove the electric heater from the engine intake manifold and check for wire disconnections and dirt clung to it.
When checking and installing the electric heater, replace its gasket with a new part.
4 - 41
.
LUBRICATING
1. Lower the work equipment to the ground, then stop the engine.
2. Using a grease pump, pump in grease through the grease fittings shown by arrows.
3. After greasing, wipe off any old grease that was pushed out.
Fuel control (1 place)
Steering, directional, gearshift lever rotating link (4 places)
4 - 42
.

For the following items, see "CHECK BEFORE STARTING (PAGE 3-70)".
Checking with machine monitor
Check coolant level, add coolant
Check fuel level, add fuel
Check water separator, drain water and sediment
Check oil level in engine oil pan, add oil
Check oil level in power train case, add oil
Check brake pedal travel
Check dust indicator
Check oil level in hydraulic tank, add oil
Check electric wiring
Check that lamps light up
Check horn sound
Check backup alarm sound
Check seat belt for wear or damage
Adjust mirror
Adjust joystick
Adjust armrest
4 - 43
.
LUBRICATING
1. Lower the work equipment to the ground, then stop the engine.
2. Using a grease pump, pump in grease through the grease fittings shown by arrows.
3. After greasing, wipe off any old grease that was pushed out.
(1) Blade lift cylinder support yoke (4 places)
REMARK
These are at the front and rear of the left and right cylinders.
(2) Blade lift cylinder support shaft (2 places)
(3) Blade arm ball joint (4 places)

(4) Brace screw (2 places)
4 - 44
.
(5) Ripper tilt cylinder bottom pin (2 places)

(6) Ripper lift cylinder bottom pin (2 places)
(7) Ripper tilt cylinder rod end pin (2 places)
(8) Ripper lift cylinder rod end pin (2 places)
(9) Ripper arm pin (front) (2 places)
(10)Ripper arm pin (rear) (2 places)
The illustration on the right shows Giant Ripper (if equipped).
(11) Equalizer bar side shaft (2 places)
(12) Suspension (Equalizer bar center shaft) (1 place)
1) Carry out greasing of the suspension (equalizer bar center

shaft) through the grease fittings marked by arrows.
2) Pump the greasing lever up and down 3 to 5 times.
4 - 45
.
CHECK ALTERNATOR DRIVE BELT TENSION, ADJUST
CHECKING
The standard deflection for the drive belt is approx.13 to 16 mm
(0.51 to 0.63 in) when pressed by thumb (approx.10 kg (22.05 lb))
at a point midway between the drive pulley and alternator pulley.
ADJUSTING
1. Remove cover mounting bolts (6) (2 places), and remove the
cover.
2. Loosen bolts and nuts (1), (2), and (5), then turn nut (4) and
adjust the belt tension.
3. After adjusting, tighten bolts and nuts (1), (2), and (5), to secure
alternator (3) in position.
4. Reinstall the cover removed in step 1. Confirm that no part of
the cover touches any turning part of the alternator.
REMARK
Check each pulley for damage, wear of the V-groove, and wear of the V-belt. In particular, be sure to check that
the V-belt is not touching the bottom of the V-groove.
If any pulley is defective, ask your Komatsu distributor to replace it.
If any belt has stretched and there is no allowance for adjustment, or if there are cuts or cracks on any belt,
replace both belts at the same time.
When adjusting the V-belt, do not push the tension pulley directly with a steel bar, etc., but put a wood piece, etc.
between the pulley and bar.
After replacing the V-belt, operate for 1 hour, then check and adjust the belt tension again.
4 - 46
.
CHECK LEVEL OF BATTERY ELECTROLYTE

Perform this check before operating the machine.
WARNING
Do not use the battery if the battery electrolyte level is below the LOWER LEVEL line. This will accelerate deterioration of the
inside of the battery and reduce the service life of the battery. In addition, it may cause an explosion.
The battery generates flammable gas and there is danger of explosion, so do not bring fire or sparks near the battery.
Battery electrolyte is dangerous. If it gets in your eyes or on your skin, wash it off with a large amount of water and consult a
doctor.
When adding distilled water to the battery, do not allow the battery electrolyte to go above the UPPER LEVEL line. If the
electrolyte level is too high, it may leak and cause damage to the paint surface or corrode other parts.
NOTICE
When adding distilled water in cold weather, add it before starting operations in the morning to prevent the electrolyte from
freezing.
Inspect the battery electrolyte level at least once a month and follow the basic safety procedures given below.
Open cover (1), (2) at the rear left side of the machine. The
batteries are installed at (A) part.
4 - 47
.
WHEN CHECKING ELECTROLYTE LEVEL FROM SIDE OF BATTERY

If it is possible to check the electrolyte level from the side of the battery, check as follows.
1. Use a wet cloth to clean the area around the electrolyte level
lines and check that the electrolyte level is between the
UPPER LEVEL (U.L.) and LOWER LEVEL (L.L.) lines.
If the battery is wiped with a dry cloth, static electricity may
cause a fire or explosion.
2. If the electrolyte level is below the midway point between the

U.L and L.L lines, remove cap (3) and add distilled water to the
U.L line.
3. After adding distilled water, tighten cap (3) securely.
REMARK
If distilled water is added to above the U.L. line, use a syringe to
lower the level to the U.L. line. Neutralize the removed fluid with
baking soda (sodium bicarbonate), then flush it away with a large
amount of water or consult your Komatsu distributor or battery
maker.
4 - 48
.
WHEN IT IS IMPOSSIBLE TO CHECK ELECTROLYTE LEVEL FROM SIDE OF BATTERY

If it is impossible to check the electrolyte level from the side of the battery, or there is no display of the UPPER
LEVEL line on the side of the battery, check as follows.
1. Remove cap (3) at the top of the battery, look through the water
filler port, and check the electrolyte surface. If the electrolyte
does not reach the sleeve, add distilled water so that the level
reaches the bottom of the sleeve (UPPER LEVEL line) without
fail.
Use the diagram below for reference, and check if the electrolyte reaches the bottom of the sleeve.
2. After adding distilled water, tighten cap (3) securely.
REMARK
If distilled water is added to above the bottom of the sleeve, use a syringe to lower the level to the bottom of the
sleeve. Neutralize the removed fluid with baking soda (sodium bicarbonate), then flush it away with a large amount
of water or consult your Komatsu distributor or battery maker.
WHEN IT IS POSSIBLE TO USE INDICATOR TO CHECK ELECTROLYTE LEVEL

If it is possible to use and indicator to check the electrolyte level, follow the instructions given.
4 - 49
.
CHECK BRAKE PERFORMANCE
WARNING
If the machine moves during the following operation, please contact your Komatsu distributor for repairs immediately.
NOTICE
Do not place the joystick in the 1st speed position.
Otherwise, it will cause damage to the machine.
Before starting the engine, check that the area around the machine is safe, then do as follows.
1. Start the engine.
2. After completing the warm-up operation, set fuel control dial (3) to the SLOW position.
3. Set work equipment lock lever (1) to the FREE position then
operate blade control lever (6) and ripper control lever (7) to
raise the blade and ripper.
Leave the work equipment lock lever (1) to the FREE position.
4. Set parking lever (2) to the FREE position.
5. Depress brake pedal (5), set joystick (4) in FORWARD, then
press the shift up button to enter 2nd speed.
6. Operate fuel control dial (3) and gradually raise the engine
speed to full throttle. (Keep the brake pedal depressed.)
7. Check that the machine does not move. This indicates that
brake performance is normal.
4 - 50
.
CHECK OIL LEVEL IN DAMPER CASE, ADD OIL

1. Open the engine side cover on the left side of the chassis.
2. Remove dipstick (G) and wipe the oil off with a cloth.
4. The oil should be between the H and L marks on dipstick (G).
If the oil is below the L mark, add engine oil through the dipstick
insertion port.
5. If the oil is above the H mark, open inspection cover (2) in the
center of the bottom face of the power train case, drain the
excess oil from engine damper drain plug (P) (this can be seen
towards the front of the machine from the inspection window),
then check the oil level again.
REMARK
Check the oil level while the engine is stopped.
If the machine is inclined, set it in a level position before
checking the oil level.
4 - 51
.

Maintenance for every 250 hours should be performed at the same time.
CHANGE OIL IN ENGINE OIL PAN, REPLACE ENGINE OIL FILTER CARTRIDGE
(including engine by-pass filter cartridge)
WARNING
The oil is at high temperature after the engine has been operated, so never change the oil immediately after finishing operations.
Wait for the oil to cool down before changing it.
Refill capacity: 50 liters (13.21 US gal)

Prepare a socket wrench and filter wrench.
1. Remove the covers at the bottom left at the front of the
machine and on the side face, and put a container directly
underneath to catch the drained oil.
2. Remove drain plug (1) and loosen drain valve (2) slowly to
avoid getting oil on yourself, and drain the oil.
Take care not to loosen drain valve (2) so much that the
stopper pin in the valve is distorted.
Tightening torque for drain plug (1): 68.6 ± 9.81 N·m
(7 ± 1 kgf·m, 50.6 ± 7.2
lbft)
Tightening torque for drain valve (2): 63.7 ± 14.7 N·m (6.5 ±
1.5 kgf·m, 47.0 ± 10.8
lbft)
3. Check the drained oil, if there is excessive metal particles or
foreign material, contact your Komatsu distributor.
4. Tighten drain valve (2), then tighten plug (1).
5. Using the filter wrench, turn engine oil filter cartridge (3) to the
left and remove it.
6. Clean the filter holder, fill the new filter cartridge with engine oil,
coat the packing surface and thread with engine oil (or coat it
thinly with grease), then install the filter cartridge.
7. When installing the filter cartridge, bring the packing surface
into contact with the filter holder, then tighten a further 3/4 to 1
turn.
8. After replacing the filter cartridge, add engine oil through oil
filler port (F) until the oil level is between the H and L marks on
the dipstick.
9. Run the engine at idling for a short time, then stop the engine, and check that the oil level is between the H and
L marks on the dipstick. For details, see "CHECK OIL LEVEL IN ENGINE OIL PAN, ADD OIL (PAGE 3-74)".
Even if the machine has not been operated for 500 hours, the oil and filter cartridge must be replaced when the
machine has been operated for 12 months.
In the same way, even if the machine has not been operated for 12 months, the oil and filter cartridge must be
replaced when the machine has been operated for 500 hours.
4 - 52
.
REPLACE FUEL FILTER CARTRIDGE (MACHINES EQUIPPED WITHOUT ADDITIONAL FUEL FILTER CARTRIDGE)
WARNING
After the engine has been operated, all parts are at high temperature, so do not replace the filter immediately. Wait for all parts
to cool down before starting the operation.
High pressure is generated inside the engine fuel piping system when the engine is running.
When replacing the filter, wait for at least 30 seconds after stopping the engine to let the internal pressure go down before
replacing the filter.
Do not bring any fire or flame close.
Be careful when opening the air bleed plug in the fuel filter head. It is still under pressure, so fuel may spurt out.
NOTICE
Genuine Komatsu fuel filter cartridges use a special filter that has highly efficient filtering ability. When replacing the filter
cartridge, always use a genuine Komatsu part.
The common rail fuel injection system used on this machine consists of more precise parts than the conventional injection
pump and nozzle.
If any part other than a genuine Komatsu filter cartridge is used, dust or dirt may get in and cause problems with the injection
system. Always avoid using substitute parts.
When carrying out inspection or maintenance of the fuel system, pay more attention than normal to the entry of dirt. If dirt is
stuck to any part, use fuel to wash it off completely.
Container to catch the oil

Filter wrench
1. Set the container under the filter cartridge to catch the drained
oil.
2. Close valve (1) of fuel strainer part.
3. Remove the drain plug at the bottom of the filter to drain fuel.
After draining fuel, tighten the drain plug.
4. Using a filter wrench, turn filter cartridge (2) counterclockwise

to remove it.
4 - 53
.
NOTICE
Do not fill the fuel filter cartridge with fuel.
Remove cap (B) and install the fuel filter.
5. Clean the filter holder, then coat the packing portion of the new
filter cartridge with oil, and install.
6. When installing, tighten until the packing surface contacts the
seal surface of the filter holder, then tighten it 3/4 of a turn.
If the filter cartridge is tightened too far, the packing will be
damaged and this will lead to leakage of fuel. If the filter
cartridge is too loose, fuel will also leak from the packing, so
always tighten to the correct amount.
7. Open valve (1) of fuel strainer and loosen air bleeding plug (3).
8. Loosen the knob of primimg pump (4), move it up and down,
and continue until no more bubbles come out with the fuel from
air bleed plug (3).
9. Tighten air bleed plug (3), push in the knob of priming pump (4),
then tighten it.
10. After replacing the filter cartridge, start the engine and check
for leakage from the filter seal surface.
REMARK
When only the filter cartridge is replaced, it is suffficient that air
bleeding is carried out for the filter head alone. But when the fuel
piping is removed, air bleeding should also be carried out for the
injection pump air-bleeding valve.
4 - 54
.
REPLACE POWER TRAIN OIL FILTER ELEMENT, STEERING LUBRICATING OIL FILTER ELEMENT
WARNING
Before opening the filter cases, depress the brake pedal several times to release the pressure, then lock the brake pedal. If there
is still pressure inside the filter, the oil may spurt out.
1. Remove the floor cover on right side fender.

(1) Power train filter
(2) Steering lubricating filter
2. Remove bolts (3), pull up cover (4), then take out element (5).
3. Clean inside of the case and the removed parts, then install a
new element.
Replace the O-ring with a new one.
4 - 55
.
CHECK OIL LEVEL IN FINAL DRIVE CASE, ADD OIL
WARNING
There is danger that oil may spurt out under internal pressure, so stand to the side, and gradually turn the plug to release internal
pressure before removing the plug.
1. Place the machine on a horizontal place.

2. Remove oil level plug (G) and check whether the final drive
case is filled with oil to lower edge of the plug hole.
3. If the oil level is still too low, add gear oil through oil filter plug
hole (F) until the oil overflows.
Before removing oil plug (F), remove all the mud and dirt from
around oil filler plug (F). Be careful not to let any dirt or sand get
in when adding oil.
REPLACE HYDRAULIC TANK BREATHER ELEMENT
WARNING
Replace the element when the oil is cold.
When removing breather cap (1), turn it slowly to release the internal
pressure before removing it.
1. Remove breather cap (1) at the top of the hydraulic tank.
2. Replace element (2) inside the cap.
4 - 56
.
REPLACE ADDITIONAL FUEL FILTER CARTRIDGE (IF EQUIPPED WITH MACHINES)
WARNING
NOTICE
pump and nozzle.

Filter wrench
1. Close the fuel valve.

2. Set the container to catch the fuel under the additional fuel filter
cartridge.
3. Using a filter wrench, turn filter cartridge counterclockwise to
remove it.
4. After removing the filter, remove transparent bowl (1) and
inspect it. If there is any damage, replace it with a new part.
5. Clean transparent bowl (1) and remove seal (2).
Coat new seal (2) with clean fuel or oil, then install it.
6. Install transparent bowl (1) to new filter cartridge (3).
Tightening torque: 10 N·m (1 kgf·m, 7.2 lbft)
7. Check that drain plug (4) at the bottom of the transparent bowl
is tightened securely.
Tightening torque: 0.2 to 0.45 N·m (0.02 to 0.046 kgf·m, 0.1 to
0.3 lbft)
8. Clean the filter holder, fill the new filter cartridge with clean fuel, coat the packing surface thinly with oil, then
install to the filter holder.
4 - 57
.
NOTICE
When adding fuel, do not remove cap (B). Always add fuel from the 8
small holes (A) on the dirty side.
After adding fuel, remove cap (B) and install the fuel filter.
Always fill with clean fuel. Be careful not to let any dirt or dust get into
the fuel. In particular, center portion is the clean side, so do not remove
cap (B) when adding fuel. Be careful not to let dirt or dust get into center
portion on the clean side.
9. When installing, tighten until the packing surface contacts the seal surface of the filter holder, then tighten it 3/4
of a turn.
If the filter cartridge is tightened too far, the packing will be damaged and this will lead to leakage of fuel. If the
filter cartridge is too loose, fuel will also leak from the packing, so always tighten to the correct amount.
When tightening with a filter wrench, be extremely careful not to dent or damage the filter.
10. When carrying out standard replacement of the fuel filter cartridge (every 1000 hours), replace the cartridge and
bleed the air. For details, see "REPLACE FUEL FILTER CARTRIDGE (MACHINES EQUIPPED WITH
ADDITIONAL FUEL FILTER CARTRIDGE) (PAGE 4-59)".
11. Open the fuel valve, start the engine, check that there is no leakage of fuel from the filter seal surface or water
separator mounting surface, then run for approx. 10 minutes at low idling.
4 - 58
.

Maintenance for every 250 and 500 hours should be performed at the same time.
REPLACE FUEL FILTER CARTRIDGE (MACHINES EQUIPPED WITH ADDITIONAL FUEL FILTER CARTRIDGE)
WARNING
NOTICE
pump and nozzle.

Filter wrench
1. Set the container under the filter cartridge to catch the drained
oil.
2. Close valve (1) of fuel strainer part.
3. Remove the drain plug at the bottom of the filter to drain fuel.
After draining fuel, tighten the drain plug.
4. Using a filter wrench, turn filter cartridge (2) counterclockwise

to remove it.
4 - 59
.
NOTICE
Do not fill the fuel filter cartridge with fuel.
Remove cap (B) and install the fuel filter.
5. Clean the filter holder, then coat the packing portion of the new
filter cartridge with oil, and install.
seal surface of the filter holder, then tighten it 3/4 of a turn.
damaged and this will lead to leakage of fuel. If the filter
cartridge is too loose, fuel will also leak from the packing, so
always tighten to the correct amount.
7. Open valve (1) of fuel strainer and loosen air bleeding plug (3).
8. Loosen the knob of primimg pump (4), move it up and down,
and continue until no more bubbles come out with the fuel from
air bleed plug (3).
9. Tighten air bleed plug (3), push in the knob of priming pump (4),
then tighten it.
10. After replacing the filter cartridge, start the engine and check
for leakage from the filter seal surface.
REMARK
When only the filter cartridge is replaced, it is suffficient that air
bleeding is carried out for the filter head alone. But when the fuel
piping is removed, air bleeding should also be carried out for the
injection pump air-bleeding valve.
4 - 60
.
CHANGE OIL IN POWER TRAIN CASE, WASH STRAINERS (POWER TRAIN PUMP STRAINER, SCAVENGING PUMP
STRAINER)
WARNING
The oil is at high temperature immediately after operations, so wait for the temperature to go down before starting the
operation.
The undercover is heavy. Do not go directly under the cover when opening or closing it. When removing bolts (5), carry out the
operation at the rear of the point immediately under the cover so that it is possible to escape at any time.
Prepare the following.

1. Remove drain cover (1) at the bottom left of the power train
case, pull out drain hose (2) from the pick-up port, then loosen
drain plug (P1) and drain the oil.
After draining the oil, tighten drain plug (P1).
Do not remove drain plug (P1).
4 - 61
.
2. Remove inspection cover (3) in the undercover at the bottom

rear of the machine as follows.
1) Remove 2 bolts (4) at the front (front of machine).
2) Hold cover (3) in position and gradually remove 2 bolts (5) at
the rear (rear of machine). (Rain water may flow out when
doing this.)
3) Lower cover (3) gradually to open it. (The front of the cover
is attached by a hinge.)
If you look up, you can see the strainer at portion (P).
3. Remove drain plug (P2) in the strainer cover, and drain the oil
(approx. 4 liters (1.06 US gal)) collected inside the piping.
4. Loosen mounting bolt (6) of the power train strainer, then
remove cover (7).
5. Remove spring (8), then remove strainer (9).
6. Remove any dirt stuck to strainer (9), then wash it in clean
diesel oil or flushing oil. Wash the removed parts and the inside
of the case at the same time.
7. Loosen mounting bolt (10) of the scavenging pump strainer,
then remove cover (11).
8. Remove strainer (12).
9. Remove any dirt stuck to strainer (12), then wash it in clean diesel oil or flushing oil. Wash the removed parts
and the inside of the case at the same time.
10. Install the strainers to their original position.
11. Replace the power train filter element.
For details, see "REPLACE POWER TRAIN OIL FILTER ELEMENT, STEERING LUBRICATING OIL FILTER
ELEMENT (PAGE 4-55)".
4 - 62
.
12. Refill the specified quantity of engine oil through oil filler (F).
13. After adding the oil, check that the oil is at the specified level.
For details, see "CHECK OIL LEVEL IN POWER TRAIN
CASE, ADD OIL (PAGE 3-75)".
If the spring or strainer are damaged,replace them with new
parts.
CHECK, CLEAN FUEL STRAINER

1. Tighten valve (1).
2. Remove cap (2), and wash the strainer and strainer case.
The strainer forms one unit with the cap.
3. After checking and cleaning, set the strainer in the case, then
tighten cap (2).
4. After installing, open valve (1).
CHECK FOR LOOSE ROPS MOUNT BOLTS

Check for loose and damaged bolts. If any loose bolt is found, tighten to a torque of 1180 to 1470 N·m (120 to 150
kgf·m, 868 to 1,085 lbft).
If any damaged bolt is found, replace the bolt with a genuine Komatsu bolt.
4 - 63
.
REPLACE MAIN CORROSION RESISTOR CARTRIDGE AND SUB CORROSION RESISTOR CARTRIDGE
WARNING
If the engine has been operated, all parts will be at a high temperature, so never try to replace the cartridge immediately after
stopping the engine.
Always wait for the engine and other parts to cool down.
Container to catch drained coolant

Prepare a filter wrench for fuel filter element.
1. Turn valve (4) of main corrosion resistor (1) and sub corrosion
resistor (2) to the Close stopper position.
2. Set a container to catch the coolant under the cartridge.
3. Using a filter wrench, turn cartridge (4) to the left to remove it.
4. Clean the filter holder, coat the packing surface and thread of
the new cartridge with engine oil, then install it to the filter
holder.
seal surface of the filter holder, then tighten it up 2/3 of a turn.
damaged and this will lead to leakage of coolant.
If the filter cartridge is too loose, coolant will also leak from the
packing, so always tighten to the correct amount.
6. Turn valve (3) of cartridge to the OPEN stopper position.
7. After replacing the cartridge, start the engine and check for any
coolant leakage from the filter seal surface. If there is any
leakage, check if the cartridge is tightened properly.
CHECK TIGHTENING PARTS OF TURBOCHARGER

Contact your Komatsu distributor to have the tightening portions checked.
4 - 64
.
REPLACE CHARGE FILTER ELEMENT

1. Remove inspection cover (1).
2. Loosen mounting bolt (2) and remove filter cover (3).

3. Remove drain plug (P) (which can be seen from under the
fender) and drain the oil.
4. Remove spring (4), then take out element (5) .
5. Clean the removed parts and the inside of filter case (6), then
install a new element.
Use a genuine Komatsu element.
6. Install inspection cover (3) with bolt (2).
4 - 65
.

Maintenance for every 250, 500, and 1000 hours should be performed at the same time.
CHANGE OIL IN HYDRAULIC TANK, REPLACE HYDRAULIC OIL FILTER ELEMENT, CLEAN HYDRAULIC TANK
STRAINER
WARNING
The oil is at high temperature immediately after the machine has been operated. Wait for the oil to cool down before changing
the oil.
When removing the oil filler cap (F), turn it slowly to release the internal pressure, then remove it carefully.

1. Lower the blade and ripper on the ground securely, stop the
engine and slowly turn the cap of oil filler (F) to release the
internal pressure. Then, remove the cap.
2. Remove drain plug (1) at the bottom of the tank and loosen
drain valve (2). After draining the oil, tighten drain plug (1) and
drain valve (2). When loosening drain valve (1), be careful not
to get oil on yourself.
3. Remove bolts (3), then remove cover (4) and take out the
element.
4. Clean the inside of case and removed parts and install a new
element.
4 - 66
.
5. Remove bolts (5), then remove cover (6) and take out the
strainer.
6. Wash the strainer in clean diesel oil or flushing oil.
7. Install the strainer to its original position.
8. Add engine oil through oil filler port (F) to the specified level.
9. After adding oil, check that the oil is at the specified level. For
details, see "CHECK OIL LEVEL IN HYDRAULIC TANK, ADD
OIL (PAGE 3-77)".
4 - 67
.
CHANGE OIL IN FINAL DRIVE CASE
WARNING
The oil is at high temperature immediately after the machine has been operated. Wait for the oil to cool down before starting
the operation.
There is danger that oil spouts out due to the internal pressure. When removing the plug, work from the side, turn the plug
slowly to release the internal pressure, and remove it carefully.

1. Remove oil filler plug (F), then remove drain plug (1) and level
plug (G), and drain the oil.
Remove all the mud and dirt from around oil filler plug (F)
before removing it. Be careful not to let any dirt or sand get in
when adding oil.
2. After draining the oil, tighten the drain plug (1).
3. Remove level plug (G), refill gear oil from oil filler plug hole (F)
until the oil overflows the level plug hole.
After refilling, tighten the plugs.
4 - 68
.
CHANGE OIL IN DAMPER CASE, CLEAN DAMPER BREATHER
WARNING
The oil is at high temperature immediately after the machine has been operated.Wait for the oil to cool down before carrying
out maintenance.
The undercover is heavy. Do not go directly under the cover when opening or closing it. When removing bolts (4), carry out the
operation at the rear of the point immediately under the cover so that it is possible to escape at any time.
Refill capacity: 1.5 liters ( 0.40 US gal)

1. Open the engine side cover at the left of the machine; you can
see gauge (G).
2. Remove the undercover (2) at the bottom rear of the chassis as

follows.
1) Remove 2 bolts (3) at the front of the chassis.
2) Hold cover (1) and gradually remove 2 bolts (4) at the rear
of the chassis. (Be careful when doing this. Rain water may
run out.)
3) Lower cover (2) slowly and open it. Drain plug (P) can be
seen at the top.
4 - 69
.
3. Remove dipstick (G), then remove drain plug (P) and drain the
oil.
After draining the oil,tighten drain plug (P).
4. Add engine oil through the holder of dipstick (G). After adding
the oil, insert dipstick (G).
5. Remove any dirt or dust stuck to breather (5), then wash with
clean diesel oil or flushing oil.If it cannot be cleaned
completely, replace with a new part.
6. Install undercover (2), then close engine side cover (1) at the
left side of the machine.
CHECK PIVOT BEARING OIL LEVEL, ADD OIL

1. Remove plug (1).
When removing plug (1), be careful not to let dirt or dust get it.
2. Check that the oil is at the level shown in the diagram. If the oil
level is low, add engine oil through the hole of plug (1).
Use class CD SAE 30 engine oil regardless of the ambient
temperature.
4 - 70
.
CHECK OIL LEVEL IN RECOIL SPRING, ASSIST CYLINDER CASE, ADD OIL
1. Remove bolts (1), then remove cover (2).
When removing the cover, be careful not to let dirt or sand get
in.
2. Loosen the plug and confirm that the internal pressure is
released.
Insert a scale and check that the oil level is 90 to 110 mm (3.6
to 4.4 in) from the bottom edge of the inspection port.
If the oil is insufficient, add engine oil.
CLEAN ENGINE BREATHER ELEMENT

1. Loosen clamp (1), then remove the hose.
2. Remove bolt (2), then remove breather (3).
3. Rinse the whole breather in diesel oil or flushing oil. Dry with
compressed air, then install it.
4. Check the breather hose, and if any deteriorated oil is stuck to
the inside, replace the hose with a new hose.
REMARK
The engine breather element is at the front end on top of the engine
(behind the radiator).
CHECK ALTERNATOR, STARTING MOTOR

The brushes mat be worn or the bearing may have run out of grease, contact your Komatsu distributor for inspection
and repairs.
If the engine is started frequently, have this inspection carried out every 1000 hours.
4 - 71
.
CHECK INJECTOR
Check the color of the exhaust gas visually. If there is any abnormality in the exhaust gas color, contact your
Komatsu distributor for inspection.
For details, see "TROUBLESHOOTING (PAGE 3-136)" "Exhaust color is black".
4 - 72
.

Maintenance for every 250, 500, 1000, and 2000 hours should be performed at the same time.
CHECK WATER PUMP

Check for oil and coolant leakage, or clogging of the drain hole. If any abnormality is found, contact your Komatsu
distributor for disassembly, repair, or replacement.
CHECK VIBRATION DAMPER

Check decrease of damper fluid, dent or out-of-flat. If there is any abnormality, contact Komatsu distributor for repair.
CLEAN, CHECK TURBOCHARGER

Contact your Komatsu distributor for cleaning or inspection.
CHECK PLAY OF TURBOCHARGER ROTOR

Contact your Komatsu distributor to have the rotor play checked.
CHECK ENGINE VALVE CLEARANCE, ADJUST

As special tool is required for removing and adjusting the parts, you shall request Komatsu distributor for service.
4 - 73
.
CHECKING FOR LOOSENESS OF HIGH-PRESSURE CLAMP, HARDENING OF RUBBER

Check that there is no looseness in the high-pressure clamp mounting bolts (1) - (15) in the drawing on the next
page. Check visually and feel with your finger to check that the rubber has not hardened. If there is any problem, the
problem part must be replaced. Contact your Komatsu distributor for part replacement.
NOTICE
If the engine continues to be used when there are loose bolts, hardened rubber, or missing parts, there is danger of damage or
breakage occurring due to vibration and wear at the connections of high-pressure piping. Always check that the proper
high-pressure piping clamps are correctly installed.
4 - 74
.
CHECKING FOR MISSING FUEL SPRAY PREVENTION CAP, HARDENING OF RUBBER

Fuel spray prevention caps (1) - (16) and fuel spray prevention cover (17) are protective parts installed to prevent
fire caused by fuel leaking and spraying out on to high temperature parts of the engine. Check visually that there
are no missing caps or loose bolts, and feel with your finger to check that the rubber has not hardened. If there is
any problem, the problem part must be replaced. Contact your Komatsu distributor for part replacement.
REPLACE INJECTOR ASSEMBLY

Please contact your Komatsu distributor to have the injector assembly replaced.
4 - 75
.
CHECK MAIN FRAME, WORK EQUIPMENT (BLADE, RIPPER)

Check after the first 4000 hours, and every 1000 hours after that.
Preparation
Wipe off all the mud that is stuck around portions (A) - (L) of the
work equipment and frame to make it easier to carry out the check.
Visual check
Carefully check the base material of the steel casting and welding
at portions (A) - (L), and check that there is no damage.
If any cracks or other damage is found, repair them.
Contact your Komatsu distributor for details of the repair
procedure.
4 - 76
.

Maintenance for every 10, 100, 250, 500, 1000, 2000, and 4000 hours of service should be performed at the same
time.
REPLACE HIGH-PRESSURE PIPING CLAMP

Contact your Komatsu distributor to have the engine high-pressure clamp replaced.
REPLACE FUEL SPRAY PREVENTION CAP

Contact your Komatsu distributor to have the fuel spray prevention cap replaced.
4 - 77
.
.
5-1
.
SPECIFICATIONS SPECIFICATIONS
SPECIFICATIONS
D275AX-5
Item Unit
Semi-U tilt dozer U tilt dozer
Operating weight (without operator) kg (lb) 57,650 (127,118) *1 58,600 (129,213) *2
Blade unit weight (including cylinder) kg (lb) 6,750 (14,884) 7,676 (16,926)
4,462 (9,839) 3,600 (7,938)
Ripper unit weight kg (lb)
(Multi-shank ripper) (Giant ripper)
Name of engine - KOMATSU SDA6D140E diesel engine
Engine horsepower KW (HP)/rpm 306 (410)/2,000
A Overall length mm (ft in) 8,905 (29' 3") 9,595 (31' 6")
B Overall height mm (ft in) 3,985 (13' 1")
C Overall width mm (ft in) 4,300 (14' 1")
Forward km/h (MPH) 3.8/6.7/11.2 (2.4/4.2/7.0)
Travel speed (1st/2nd/3rd)
Reverse km/h (MPH) 4.9/8.7/14.9 (3.0/5.4/9.3)
*1: Semi-U tilt dozer, multi-shank ripper, ROPS cab, air conditioner
*2: U tilt dozer, Giant ripper, ROPS cab, air conditioner
5-2
.
6-1
.
GENERAL PRECAUTIONS ATTACHMENTS, OPTIONS
GENERAL PRECAUTIONS
PRECAUTIONS RELATED TO SAFETY
If attachments or options other than those authorized by Komatsu are installed, this will not only affect the life of the
machine, but will also cause problems with safety.
When installing attachments not listed in this Operation and Maintenance Manual, contact your Komatsu distributor
first.
If you do not contact Komatsu, we cannot accept any responsibility for any accidents or failures.
WARNING
General precautions
Read the instruction manual for the attachment carefully, and do not use the machine before you understand the operation
method completely.
If you lose the instruction manual, be sure to order another copy from your Komatsu distributor.
To prevent serious personal injury caused by misoperation, place your foot on the pedal only when operating the pedal.
Precautions for removal and installation
When removing or installing an attachment, observe the following items and work safely.
Select a firm, level surface when installing or removing an attachment.
When working in cooperation with one or more other workers, decide signs and observe them when carrying out the operation.
When carrying a heavy part (25 kg (55 lb) or more), use a crane.
When removing a heavy part, always place a support in position before removing it.
When lifting a load with a crane, be particularly careful of the center of gravity.
It is dangerous to carry out operations when the load has been raised by a crane. Always lower the load onto a stand and check
that it is safe.
When leaving an attachment removed or installing it, place it in a stable position to prevent it from falling over.
Never go under a load raised by a crane.
Always stand in a place which is safe even if the load should fall.
NOTICE
Qualifications are required to operate a crane. Never allow the crane to be operated by an unqualified person.
For details of removal and installation operations, contact your Komatsu distributor.
6-2
.
ATTACHMENTS, OPTIONS SELECTION OF TRACK SHOE
SELECTION OF TRACK SHOE

SELECTION OF TRACK SHOES
Select suitable track shoes to match the operating conditions.
METHOD OF SELECTING SHOES

If a wider shoe than necessary is used, the load on the track will increase, and this will cause the shoes to bend, links
to crack, pins to break, shoe bolts to come loose, and various other problems.
Category Use Precautions when using Track shoe width

Bedrock, This shoe can be used for a wide range of work from crushed
A normal rock to general civil engineering work such as reclamation of 610 mm (24 in)
soil residential land. There is no particular limit to its use.
Use this shoe for general soil, such as where the main work is
scraper work and pusher work, reclaiming land for golf courses, or
Normal
B stripping the overburden for coal mines. This shoe cannot be 610 mm (24 in)
soil
used on bedrock. On jobsites where there are rocks in the soil, be
careful to avoid letting the machine mount the rocks.
Use this shoe on soft ground where the shoe in category B sinks
710 mm (28 in)/
C Soft soil into the ground. Do not use this shoe on jobsites where there are
760 mm (29.9 in)
rocks in the soil.
6-3
.
PROCEDURE FOR SELECTING RIPPER POINT ATTACHMENTS, OPTIONS
PROCEDURE FOR SELECTING RIPPER POINT

PROCEDURE FOR SELECTING RIPPER POINT
6-4
.
ATTACHMENTS, OPTIONS CAP WITH LOCK, HANDLING
CAP WITH LOCK, HANDLING

METHOD OF OPENING AND CLOSING CAP WITH LOCK
Lock-type caps are available for the radiator water filler, fuel tank filler cap, power train case oil filler cap, hydraulic
tank oil filler cap, and hydraulic tank breather cap. The method of opening or closing the cap is as follows.
TO OPEN THE CAP

1. Insert the key. Make sure that you have inserted the key fully
before turning it. If the key is turned when only partially
inserted, it may break.
2. Turn the key counterclockwise to align the match mark on the
cap with the rotor groove, then turn the cap slowly. When a
click is heard, the lock is released, enabling the cap to be
opened.
TO LOCK THE CAP

1. Turn the cap into place.
2. Turn the key clockwise and take the key out.
6-5
.
EFFECTIVE METHOD OF OPERATION FOR DUAL TILT DOZER ATTACHMENTS, OPTIONS
EFFECTIVE METHOD OF OPERATION FOR DUAL TILT DOZER

BLADE CONDITION
SINGLE TILT
Operate single/dual tilt selector switch to the SINGLE position,
then operate the tilt.
Applicable operation
Normal operations
DUAL TILT
Operate single/dual tilt selector switch to the DUAL position, then
operate the tilt.
Side cutting operations (high places)
Horizontal dozing operations form side slope (rough ground)
Ditching work
R PITCH (PITCH BACK)

Keep the pitch button pushed in and operate the left tilt.
Hauling
Dozing soft soil (filling)
Leveling operations (spreading)
6-6
.
ATTACHMENTS, OPTIONS EFFECTIVE METHOD OF OPERATION FOR DUAL TILT DOZER
S PITCH (STANDARD)
Normal operations
Normal operations
F PITCH (PITCH DUMP)

Keep the pitch button pushed in and operate the right tilt.
Digging natural ground and bed-rock (digging hard soil)
Pushing soil over cliffs
Pushing-up soil
(Reduces spillage of soil over the top surface of the blade, and
reduces amount of soil carried back)
6-7
.
DOZING WORK
DOZING ON LEVEL GROUND, OR DOWNHILL
NATURAL GROUND, BEDROCK
WARNING
If you feel that the situation is dangerous when dumping the soil, for safety reasons, use two movements to push the soil over the
edge.
1. Dig with the F (Front) pitch, and when the load on the blade is approx. 80%, return to S (Straight) pitch and
continue digging.
2. Set to R (Rear) pitch which gives a larger load, and haul the soil. Adjust the cutting angle to the most effective
angle for rolling the soil.
3. Use F pitch to dump the soil.
6-8
.
FILLING, SOFT SOIL

Carry out digging in R pitch or S pitch, and haul in R pitch.
REMARK
If the digging is carried out in R pitch, there is no sudden digging
into the soil, and the operation can be carried out smoothly.
HARD SOIL (HARD CLAY, SHALE, ETC.)

If digging is carried out in F pitch, and the chassis is raised and the
blade is tilted, the end bit will dig in better.
6-9
.
PUSHING-UP SOIL
1. Dig with S pitch.

When digging gradually, use R pitch.
If the ground is hard, use F pitch.
2. Haul with R pitch.
If there is any spillage of soil over the top of the blade, change to S pitch.
3. Dump the soil with F pitch.
This dumps the soil more effectively, and less soil is carried back.
6 - 10
.
LEVELING (SPREADING) OPERATION

Carry out this operation with R itch.
When carry out this operation with R pitch, the end bit does not dig
in, and the ground can be leveled ( or the soil can be spread
smoothly.)
REMARK
If the tilt cylinder is moved completely to the end of its stroke, the
tilt operation cannot be carried out on one side, so move the
cylinder back slightly from the end of its stroke to the S pitch
position.
DITCHING OPERATION
If the dual tilt is used, the digging width becomes smaller and a
deeper ditch can be dug.
If R pitch is used, the digging can be carried out gradually, and this
reduces the unevenness.
BOULDER RAISING OPERATION

Because the dual tilt greatly increases the amount of tilt, the blade
can dig in deep and hook under the boulder. In addition, the
operating stroke is large, so operations to raise boulders can be
carried out effectively.
6 - 11
.
SIDE-CUTTING OPERATIONS
Carry out this operation in R pitch, and set the end face of the end
bit in contact with the rock face to carry out cutting.
REMARK
With the dual tilt it is possible to increase the amount of tilt and to
carry out side-cutting operations on higher walls.
HORIZONTAL DOZING OPERATIONS FROM SIDE SLOPE (ROUGH GROUND)

The dual tilt can give a larger amount of tilt, so when dozing from
a side slope, this is effective because the chassis becomes
horizontal after a short digging distance.
6 - 12
.
ATTACHMENTS, OPTIONS SHOE SLIP CONTROL
SHOE SLIP CONTROL

MODE SELECTION SWITCH PANEL (SHOE SLIP CONTROL)
Press each mode switch to turn it ON or OFF and to select the mode.
For details of setting the mode to use, see "EFFECTIVE USE OF MODE SELECTION SYSTEM (PAGE 3-112)".
The economy mode, reverse slow mode, and shoe slip control mode can be used independently or in
combination.
(1) Shoe slip control switch (2) Rock selection mode selector switch
SHOE SLIP CONTROL SWITCH

This switch (1) is used for ripping operations.
When it is switched ON, the lamp lights up.
NOTICE
If the shoe slip control is switched ON, the rock selection mode is
automatically set to [3], so switch the rock selection mode to match the
type of rock.
6 - 13
.
SHOE SLIP CONTROL ATTACHMENTS, OPTIONS
ROCK SELECTION MODE SELECTOR SWITCH

Using this switch (2) during ripping operations, turn the shoe slip
control ON and select mode [1] - [5] according to the shoe slip
ratio.
The lamp for the selected mode lights up.
EFFECTIVE USE OF MODE SELECTION SYSTEM
(1) Lock up mode switch (4) Shoe slip control switch

(2) Economy mode selector switch (5) Rock selection mode selector switch
(3) Reverse slow mode selector switch
Selecting mode to match the type of work and quality of rock and soil makes to perform operations effectively.
The condition when all the mode selection switches are off is called the standard mode.
It is impossible to use any combination of the lock-up mode and any other mode.
The economy mode, reverse slow mode, and shoe slip control mode can be used independently or in combination.
{: Possible to use ±: Compound use not possible
6 - 14
.
SELECTION OF MODE
DOZING OPERATIONS
LOCK UP MODE
By using the lock up mode, the travel speed increases, the
operating efficiency is improved, and the fuel consumption is also
reduced.
Speed ranges that can be used: All speed ranges
Applicable operations: Dozing loose material (suitable for
long-distance hauling operations)
When the lock up mode is turned ON, direct drive or torque
converter drive are automatically selected according to the load.
(Example)
Slot dozing operations
Hillside dozing operations
REMARK
If dozing operations are carried out on a slope of more than 15
°, the lock-up tends to be canceled, so operations are easier to
carry out in the standard mode.
For normal ripping operations, if the lock-up mode is used, the
lock-up will switch repeatedly between ON and OFF, so use the
standard mode or shoe slip control mode.
Even with ripping operations, if the ground is extremely soft, the
lock-up mode can be used.
6 - 15
.
ECONOMY MODE
Using the economy mode makes it possible to reduce wasteful
shoe slippage and to reduce the fuel consumption.
Applicable operations: Hauling after ripping, dozing blasted
rock, smoothing
When the economy mode is turned ON, it is automatically set to [1].
Carry out dozing operations in this condition, then set to [2] and
carry out operations. From this test, select the matching that gives
power and low shoe slip ratio (frequency of deceleration
operation).
Mode [1] is set to approx. 90% of full power and mode [2] is set to
approx 70%.
(Example)
Fine leveling operations
Ripping and dozing operations
REMARK
If the shoe slip control switch is turned ON and the ripper is lowered during dozing operations in the standard
mode, the system will enter the shoe slip control mode. If this happens, return to the N position, set the speed
range to F1, and this will return to the standard mode.
If the economy mode and shoe slip control switches are turned ON and the ripper is lowered during dozing
operations in the economy mode, the system will enter the shoe slip control mode. If this happens, return to the
N position, set the speed range to F1, and this will return to the standard mode.
6 - 16
.
RIPPING OPERATIONS
SHOE SLIP CONTROL

This makes it possible to reduce the frequency of operation of the
decelerator pedal by the operator, and contributes to reduction in
operator fatigue. It also prevents wasteful shoe slippage, improves
the service life of the undercarriage, and reduces fuel
consumption.
Applicable operations: Ripping
In normal ripping operations, the operator uses the decelerator
pedal to control the engine speed while carrying out ripping. If the
shoe slip control is turned ON, the shoe slip control system aids the
operator in carrying out this control.
When the shoe slip control switch is turned ON, the rock selection
mode is automatically set to [3].
Carry out operations in this condition, and if the shoe slip ratio is too
high, press a switch in the hard direction to set the mode to [4] or
[5].
If the shoe slip ratio is low and there seems to be lack of power,
press the switch in the soft direction to set the mode to [2] or [1].
REMARK
After the joystick is set to F1, the shoe slip control starts when
the ripper lever is operated to LOWER or TILT. Even when the
operation alternates between dozing and ripping, there is no
need to turn the switch ON or OFF.
With this system, if shoe slippage occurs during ripping
operations, the engine speed is lowered to prevent wasteful
shoe slippage.
If shoe slippage occurs during ripping operations and the
engine speed goes down, if the ripper lever is operated to TILT
IN or RAISE, the engine speed will rise (output is increased) to
make it easier to carry out breaking operations.
When carrying out ripping operations on hard rock, if the rear of
the machine comes off the ground and there is sudden shoe
slippage, it is possible to reduce the shoe slippage by operating
the ripper to LOWER and reducing the engine speed.
6 - 17
.
REVERSE SLOW MODE

This reduces the travel speed when traveling in reverse, reduces
the frequency of operating the deceleration pedal, and improves
the riding comfort for the operator.
Speed ranges that can be used: R1, 2, 3
(If this mode is only necessary when traveling in R2 or R3, it is
possible to change the setting of the service mode. To do this,
please contact your Komatsu distributor.)
Applicable operations: Traveling on bedrock, traveling down
steep hills
Use this mode to reduce the travel speed when traveling in R1, R2,
or R3.
When the reverse slow mode is ON, the travel speed is set to
approx. 80% of the full travel speed.
Use this mode to reduce the travel speed when traveling in reverse
after ripping and dozing bedrock or when traveling in reverse after
dozing on steep slopes. The travel speed differs in each mode
according to whether it is used in combination with the economy
mode or with shoe slip control.
When using shoe slip control, the travel speed for bedrock setting
modes [1] - [5] is set at approx. 70 - 90% of the full travel speed.
When traveling on bedrock, if it is felt that the travel speed when

When traveling down slopes, if it is felt that the travel speed when
6 - 18
.
PROCEDURE FOR SELECTING MODE ACCORDING TO NATURE OR NEEDS TO WORK

Use the table below to select the mode that matches the nature or needs of the operation.
6 - 19
.
IF MODE SELECTION SYSTEM FLASHES

If the caution lamp flashes, or it becomes impossible to control the engine speed with the fuel control dial or
decelerator pedal, stop operation immediately, check the monitor panel display, then contact your Komatsu
In addition to the above problems, if any of the problems in the table below occur, there is probably an abnormality
in the work equipment lever switch, transmission speed range sensor, or other part, so please contact your Komatsu
Mode Operation Abnormality

When shoe slip occurs, it is impossible to throttle power
Even when there is shoe slippage, it is impossible to control
After slippage stops, it takes a long time for power to recover
It becomes difficult to break rock by operating lever to TILT or RAISE
Shoe slip control Ripping
Travel speed increases when shank is inserted
Travel speed is slow and drawbar pull is lacking
No sense of control, engine stays at full or partial
Chassis flies when starting ripping
6 - 20
.
INDEX
INDEX
<A> ENGINE SERIAL NO. PLATE AND

ACCUMULATOR, HANDLING 3- 67 POSITION 1- 8
ADJUSTING POSTURE OF WORK EXPLANATION OF COMPONENTS 3- 5
EQUIPMENT 3-124
AIR CONDITIONER, HANDLING 3- 62 <F>
ASHTRAY 3- 53 FOREWORD 1- 2
FRONT PANEL 3- 5
<B> FRONT/REAR, LEFT/RIGHT
BLADE SERIAL NO. PLATE POSITION 1- 9 DIRECTIONS OF MACHINE 1- 7
FUSE BOX 3- 48
<C> FUSIBLE LINK 3- 51
CAP WITH LOCK, HANDLING 6- 5
METHOD OF OPENING AND <G>
CLOSING CAP WITH LOCK 6- 5 GENERAL PRECAUTIONS 2- 9
CAR STEREO, HANDLING 3- 54 GENERAL PRECAUTIONS 6- 2
CHECK AFTER FINISHING WORK 3-109 PRECAUTIONS RELATED TO
CHECK AFTER STOPPING ENGINE 3- 93 SAFETY 6- 2
CHECK BEFORE STARTING ENGINE, GENERAL VIEW 3- 2
ADJUST 3- 68 GENERAL VIEW OF CONTROLS AND
COLD WEATHER OPERATION 3-133 GAUGES 3- 3
AFTER COLD WEATHER 3-134 GENERAL VIEW OF MACHINE 3- 2
AFTER COMPLETION OF WORK 3-134 GUIDES TO MAINTETNANCE 4- 2
PRECAUTIONS FOR LOW
TEMPERATURE 3-133 <H>
CONTROL LEVERS, PEDALS 3- 38 HANDLING OIL, FUEL, COOLANT, AND
PERFORMING OIL CLINIC 4- 5
<D>
DOOR OPEN LOCK 3- 52 <I>
DOOR POCKET 3- 53 INSTALLATION OF CAB 3-132
DUST INDICATOR 3- 46 INTRODUCTION 1- 7
<E> <L>
EFFECTIVE METHOD OF OPERATION LOADING, UNLOADING WORK 3-129
FOR DUAL TILT DOZER 6- 6 LOCKING 3-109
BLADE CONDITION 6- 6 LONG-TERM STORAGE 3-135
BOULDER RAISING OPERATION 6- 11 AFTER STORAGE 3-135
DITCHING OPERATION 6- 11 BEFORE STORAGE 3-135
DOZING WORK 6- 8 DURING STORAGE 3-135
HORIZONTAL DOZING
OPERATIONS FROM SIDE SLOPE <M>
(ROUGH GROUND) 6- 12 MACHINE SERIAL NO. PLATE AND
LEVELING (SPREADING) POSITION 1- 8
OPERATION 6- 11 MAINTENANCE SCHEDULE CHART 4- 16
SIDE-CUTTING OPERATIONS 6- 12 METHOD OF LIFTING MACHINE 3-130
EFFECTIVE USE OF MODE MOVING MACHINE OFF 3- 94
SELECTION SYSTEM 3-112
7-1
.
INDEX
<N> SAFETY CRITICAL PARTS 4- 15

NECESSARY INFORMATION 1- 8 SAFETY INFORMATION 1- 5
SAFETY LABELS 2- 4
<O> POSITIONS OF SAFETY
OPERATING METHOD FOR RIPPING PICTOGRAMS 2- 4
OPERATIONS 3-120 SAFETY LABELS 2- 5
OPERATION 3- 68 SASH GLASS INTERMEDIATE LOCK 3- 52
OPERATIONS AND CHECKS AFTER SELECTION OF TRACK SHOE 6- 3
STARTING ENGINE 3- 90 SELECTION OF TRACK SHOES 6- 3
OUTLINE OF ELECTRIC SYSTEM 4- 8 SERVICE PROCEDURE 4- 19
OUTLINES OF SERVICE 4- 5 CHECK BEFORE STARING 4- 43
<P> EVERY 2000 HOURS SERVICE 4- 66
PARKING MACHINE 3-107 EVERY 250 HOURS SERVICE 4- 44
PERIODIC REPLACEMENT OF SAFETY EVERY 4000 HOURS SERVICE 4- 73
CRITICAL PARTS 4- 14 EVERY 500 HOURS SERVICE 4- 52
POSITIONF OF SERVICE METER 1- 9 EVERY 8000 HOURS SERVICE 4- 77
POWER SOURCE 3- 47 INITIAL 250 HOURS SERVICE
PRECAUTIONS FOR LOADING 3-129 (ONLY AFTER THE FIRST 250
PRECAUTIONS FOR MAINTENANCE 2- 27 HOURS) 4- 19
PRECAUTIONS FOR OPERATION 2- 17 WHEN REQUIRED 4- 20
BATTERY 2- 24 SHIFTING BETWEEN FORWARD AND
BEFORE STARTING ENGINE 2- 17 REVERSE 3-100
OPERATION 2- 19 SHIFTING GEAR 3- 97
TOWING 2- 26 SHOE SLIP CONTROL 6- 13
TRANSPORTATION 2- 23 EFFECTIVE USE OF MODE
PRECAUTIONS FOR OPERATION 3-105 SELECTION SYSTEM 6- 14
PRECAUTIONS FOR IF MODE SELECTION SYSTEM
TRANSPORTATION 3-131 FLASHES 6- 20
PROCEDURE FOR SELECTING MODE SELECTION SWITCH PANEL
RIPPER POINT 6- 4 (SHOE SLIP CONTROL) 6- 13
PROCEDURE FOR SELECTING SPECIFICATIONS 5- 2
RIPPER POINT 6- 4 STANDARD TIGHTENING TORQUES
FOR BOLTS AND NUTS 4- 13
<R> STARTING ENGINE 3- 87
RECOMMENDED FUEL, COOLANT, STEERING MACHINE 3-102
AND LUBRICANT 4- 10 STOPPING ENGINE 3- 93
RECOMMENDED BRANDS, STOPPING MACHINE 3- 96
RECOMMENDED QUALITY FOR SWITCHES 3- 34
PRODUCTS OTHER THAN
KOMATSU GENUINE OIL 4- 12 <T>
USE OF FUEL, COOLANT TABLE TO ENTER SERIAL NO. AND
AND LUBRICANTS ACCORDING TO DISTRIBUTOR 1- 10
AMBIENT TEMPERATURE 4- 11 TIPS FOR LONGER UNDERCARRIAGE
REMOVAL OF CAB 3-131 LIFE 3-127
RIPPER OPERATION 3-117 TOOL BOX 3- 53
RIPPER SERIAL NO. PLATE POSITION 1- 9 TORQUE LIST 4- 13
TRANSPORTATION 3-129
<S> TRANSPORTATION PROCEDURE 3-129
SAFETY 2- 2 TRAVELING ON ROADS 3-131
7-2
.
INDEX
TROUBLESHOOTING 3-136
AFTER RUNNING OUT OF FUEL 3-136
IF BATTERY IS DISCHARGED 3-138
METHOD OF TOWING MACHINE 3-137
OTHER TROUBLE 3-141
WHEN MODE SELECTION SYSTEM
FLASHES 3-146
<W>
WORK POSSIBLE USING BULLDOZER 3-110
7-3
.
D275AX-5 GALEO BULLDOZER

Form No. TEN00034-00
©
2004 KOMATSU
All Right Reserved
Printed in Japan 12-04

Operación y Mantenimiento

Uploaded by

Copyright:

Available Formats

Operación y Mantenimiento

Uploaded by

Document Information

Copyright

Available Formats

Share this document

Share or Embed Document

Sharing Options

Did you find this document useful?

Is this content inappropriate?

Copyright:

Available Formats

Operación y Mantenimiento

Uploaded by

Copyright:

Available Formats

TEN00034-00

Operation & Maintenance

Copyright 2005 Komatsu

Read this manual thoroughly and understand its contents fully.

Location to keep operation & maintenance manual

FOREWORD SAFETY INFORMATION

Example of safety message using signal word

Other signal words

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

SAFETY INFORMATION FOREWORD

Example of safety label using words

Safety labels using pictogram

FRONT/REAR, LEFT/RIGHT DIRECTIONS OF MACHINE

NECESSARY INFORMATION FOREWORD

MACHINE SERIAL NO. PLATE AND POSITION

ENGINE SERIAL NO. PLATE AND POSITION

EPA: Environmental Protection Agency, U.S.A.

FOREWORD NECESSARY INFORMATION

BLADE SERIAL NO. PLATE POSITION

RIPPER SERIAL NO. PLATE POSITION

POSITION OF SERVICE METER

NECESSARY INFORMATION FOREWORD

TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR

Machine serial No.

Engine serial No.

KOMATSU GENUINE OIL 4- 12

Precautions for Operation 2- 17

Precautions for Maintenance 2- 27

SAFETY LABELS SAFETY

POSITIONS OF SAFETY PICTOGRAMS

SAFETY SAFETY LABELS

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

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

SAFETY LABELS SAFETY

(4) Caution for high-temperature coolant (09668-03001)

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

(6) Caution for check and adjust track tension (195-98-22931)

(7) Caution for handling electric wires (09808-03000)

SAFETY SAFETY LABELS

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

(9) Caution for handling accumulator (09659-53000)

(10) Caution for use of seat belt (195-98-12940)

(11) Caution for approach when machine moving (09812-03000)

SAFETY LABELS SAFETY

(12) Warning for ROPS (09620-30201)

(13) Warning for battery (09664-30082)

SAFETY GENERAL PRECAUTIONS

IF ABNORMALITIES ARE FOUND

CLOTHING AND PERSONAL PROTECTIVE ITEMS

FIRE EXTINGUISHER AND FIRST AID KIT

GENERAL PRECAUTIONS SAFETY

KEEP MACHINE CLEAN

INSIDE OPERATOR'S COMPARTMENT

ALWAYS APPLY LOCK WHEN LEAVING OPERATOR'S SEAT

When leaving the machine, always lower the work equipment

SAFETY GENERAL PRECAUTIONS

HANDRAILS AND STEPS

To ensure safety, always face the machine and maintain

MOUNTING AND DISMOUNTING

GENERAL PRECAUTIONS SAFETY