Komatsu D65EX, D65PX Operation Manual

Operation & Maintenance
Manual

SEAM049901T

D65EX
D65PX

-15

-15

BULLDOZER

SERIAL NUMBERS D65EX-15 67001 and up

D65PX-15 67001 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 cha nges 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 2004 Komatsu
Printed in U.S.A.

Komatsu America Corp.

September 2004

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1 - 1

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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

Operators and maintenance personnel must always do as follows before beginning operation or maintenance.

Always be sure to read and understand this manual thoroughly before performing operation and maintenance.

Read the safety messages given in this manual and the safety labels affixed to the machine thoroughly and be sure that you
understand them fully.

Keep this manual at the storage location for the Operation and Maintenance Manual given below, and have all personnel read it
periodically.

If this manual has been lost or has become dirty and cannot be read, request a replacement manual immediately from Komatsu
or your Komatsu distributor.

If you sell the machine, be sure to give this manual to the new owners together with the machine.

Komatsu deliversmachines that comply with all applicable regulations and standards of the country to which it hasbeen shipped.
If this machine has been purchased in another country or purchased from someone in another country, it may lack certain safety
devices and specifications that are necessary for use in your country. If there is any question about whether your product
complies with the applicable standards and regulations of your country, consult Komatsu or your Komatsu distributor before
operating the machine.

Storage location for the Operation and Maintenance Manual:
If machine is equipped with a cab.
Inside of right and left doors

1 - 2

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FOREWORD

FOREWORD

If machine is equipped without cab.
Pocket at rear of operator's seat

FOREWORD

FOREWORD

1 - 3

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FOREWORD

FOREWORD

1 - 4

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FOREWORD

FOREWORD

1 - 5

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SAFETY INFORMATION

FOREWORD

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 safety 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 - 6

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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 INFORMATION

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 hazardouscondition
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 - 7

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INTRODUCTION

INTRODUCTION

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

Dozing
Smoothing
Cutting into hard or frozen ground or ditching
Felling trees, removing stumps

See the section "WORK POSSIBLE USING BULLDOZER (PAGE 3-104)" for further details.

FRONT/REAR, LEFT/RIGHT DIRECTIONS OF MACHINE

FOREWORD

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 - 8

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FOREWORD

NECESSARY INFORMATION

NECESSARY INFORMATION

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

MACHINE SERIAL NO. PLATE AND POSITION

This is at the front bottom right of the operator's seat.

ENGINE SERIAL NO. PLATE AND POSITION

The nameplate for this machine is provided at the center of the left side of the engine cylinder block.

1 - 9

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NECESSARY INFORMATION

POSITION OF SERVICE METER

The service meter is providedat the lower partof themonitor panel.

TABLE OF ENTER SERIAL NO. AND DISTRIBUTOR

Machine serial No.

Engine serial No.

FOREWORD

Distributor name

Address

Service Personnel

Phone/Fax

1 - 10

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FOREWORD

CONTENTS

CONTENTS

FOREWORD 1- 1
FOREWORD 1- 2
SAFETY INFORMATION 1- 6
INTRODUCTION 1- 8
FRONT/REAR, LEFT/RIGHT DIRECTIONS OF MACHINE 1- 8
NECESSARY INFORMATION 1- 9
MACHINE SERIAL NO. PLATE AND POSITION 1- 9
ENGINE SERIAL NO. PLATE AND POSITION 1- 9
POSITION OF SERVICE METER 1- 10
TABLE OF 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
STARTING ENGINE 2- 17
OPERATION 2- 19
TRANSPORTATION 2- 22
BATTERY 2- 23
TOWING 2- 25
PRECAUTIONS FOR MAINTENENCE 2- 26
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- 6
FRONT PANEL 3- 6
SWITCHES 3- 33
CONTROL LEVERS AND PEDALS 3- 37
CIRCUIT BREAKER 3- 45
FUSE 3- 46
FUSIBLE LINK 3- 47
ELECTRIC POWER TAKE-OUT ADAPTER 3- 48
DOOR - OPEN LOCK 3- 49
SASH GLASS INTERMEDIATE LOCK 3- 49
DOOR POCKET 3- 50
OPENING AND CLOSING ENGINE SIDE COVER 3- 50
ASHTRAY 3- 51
TOOL BOX 3- 51
SHOVEL HOLDER 3- 51
CAR STEREO, HANDLING 3- 52
AIR CONDITIONER, HANDLING 3- 60
ACCUMULATOR, HANDLING 3- 65
OPERATION 3- 66
CHECK BEFORE STARTING ENGINE, ADJUST 3- 66
STARTING ENGINE 3- 83
OPERATIONS AND CHECKS AFTER STARTING ENGINE 3- 88

1 - 11

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CONTENTS

STOPPING ENGINE 3- 91
MACHINE OPERATION 3- 92
SHIFTING GEARS 3- 95
SHIFTING BETWEEN FORWARD AND REVERSE 3- 98
STEERING MACHINE 3-100
PRECAUTIONS FOR OPERATION 3-102
WORK POSSIBLE USING BULLDOZER 3-104
ADUSTING POSTURE OF WORK EQUIPMENT 3-106
PARKING MACHINE 3-110
CHECK AFTER STOPPING ENGINE 3-111
CHECK AFTER FINISHING WORK 3-111
LOCKING 3-112
TIPS FOR LONGER UNDERCARRIAGE LIFE 3-113
TRANSPORTATION 3-116
TRANSPORTATION MEANS 3-116
REMOVING CAB 3-116
PRECAUTIONS WHEN REMOVING WORK EQUIPMENT 3-117
PRECAUTIONS WHEN REMOVING ROPS 3-117
LOADING, UNLOADING WORK 3-118
LIFTING MACHINE 3-121
TRAVELING ON ROADS 3-122
COLD WEATHER OPERATION 3-123
PRECAUTIONS FOR LOW TEMPERATURE 3-123
AFTER COMPLETION OF WORK 3-125
AFTER COLD WEATHER 3-125
LONG-TERM STORAGE 3-126
BEFORE STORAGE 3-126
DURING STORAGE 3-126
AFTER STORAGE 3-126
TROUBLESHOOTING 3-127
AFTER RUNNING OUT OF FUEL 3-127
MACHINE TOWING METHOD 3-127
IF BATTERY IS DISCHARGED 3-128
OTHER TROUBLE 3-132
MAINTENANCE 4- 1
GUIDE TO MAINTENANCE 4- 2
OUTLINE OF SERVICE 4- 5
OUTLINE OF OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC 4- 5
RELATING TO ELECTRIC SYSTEM 4- 7
WEAR PARTS LIST 4- 8
WEAR PARTS LIST 4- 8
USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE 4- 10
PROPER SELECTION OF FUEL, COOLANT AND LUBRICANTS 4- 10
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS 4- 14
TORQUE LIST 4- 14
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS 4- 15
SAFETY CRITICAL PARTS 4- 15
MAINTENANCE SCHEDULE CHART 4- 17
MAINTENANCE SCHEDULE CHART 4- 17
SERVICE PROCEDURE 4- 19

FOREWORD

1 - 12

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FOREWORD

WHEN REQUIRED 4- 19
CHECK BEFORE STARTING 4- 39
EVERY 50 HOURS SERVICE 4- 40
EVERY 250 HOURS SERVICE 4- 41
EVERY 500 HOURS SERVICE 4- 51
EVERY 1000 HOURS SERVICE 4- 55
EVERY 2000 HOURS SERVICE 4- 60
EVERY 4000 HOURS SERVICE 4- 64
EVERY 8000 HOURS SERVICE 4- 66
SPECIFICATIONS 5- 1
SPECIFICATIONS 5- 2
ATTACHMENTS, OPTIONS 6- 1
GENERAL PRECAUTIONS 6- 2
PRECAUTIONS RELATED TO SAFETY 6- 2
HANDLING HYDRAULIC RIPPER 6- 3
GENERAL VIEW 6- 3
EXPLANATION OF COMPONENTS 6- 4
OPERATION 6- 5
TROUBLESHOOTING 6- 7
MAINTENANCE 6- 8
SPECIFICATIONS 6- 8
DELUXE SEAT 6- 9
HEADREST 6- 11
EQUIPPING FIRE EXTINGUISHER AND FIRST- AID KIT 6- 12
INDEX 7- 1

CONTENTS

1 - 13

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2 - 1

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SAFETY

SAFETY

SAFETY

SAFETY LABELS 2- 4
POSITION 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 compertment 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 attachment 2- 11
Crushing or cutting prevention 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 (Roll Over Protective Structure) 2- 13
Precautions for attachments 2- 13
Unauthorized medification 2- 14
Safety at worksite 2- 14
Working on loose ground 2- 14
Do not go close to high-voltage cables 2- 14
Ensure good visibility 2- 15
Ventilation for enclosed aresa 2- 15
Checking signalman's signals and signs 2- 15
Emergency exit from operator's cab 2- 15
Be careful about asbestos dust 2- 16

2 - 2

SAFETY SAFETY

PRECAUTIONS FOR OPERATIONS---------------------------------------------------------------------------------------------------2- 17
BEFORE STARTING ENGINE---------------------------------------------------------------------------------------------------------2- 17
Checks before starting engine-------------------------------------------------------------------------------------------------------2- 17
Precautions when starting------------------------------------------------------------------------------------------------------------2- 17

Precautions in cold areas-------------------------------------------------------------------------------------------------------------2- 17

AFTER STARTING ENGINE -----------------------------------------------------------------------------------------------------------2- 19
Checks after starting engine ---------------------------------------------------------------------------------------------------------2- 19
Precautions for moving machine forward or in reverse------------------------------------------------------------------------2- 19
Precautions when traveling-----------------------------------------------------------------------------------------------------------2- 19
Traveling on slopes---------------------------------------------------------------------------------------------------------------------2- 20
Using brake-------------------------------------------------------------------------------------------------------------------------------2- 20
Operate carefully on snow------------------------------------------------------------------------------------------------------------2- 20
Parking machine ------------------------------------------------------------------------------------------------------------------------2- 21
TRANSPORTATION----------------------------------------------------------------------------------------------------------------------2- 22
Loading and unloading ----------------------------------------------------------------------------------------------------------------2- 22
Shipping-----------------------------------------------------------------------------------------------------------------------------------2- 22
BATTERY -----------------------------------------------------------------------------------------------------------------------------------2- 23
Battery hazard prevention ------------------------------------------------------------------------------------------------------------2- 23
Starting with booster cable -----------------------------------------------------------------------------------------------------------2- 24
TOWING-------------------------------------------------------------------------------------------------------------------------------------2- 25
When towing -----------------------------------------------------------------------------------------------------------------------------2- 25

PRECAUTIONS FOR MAINTENANCE-------------------------------------------------------------------------------------------------2- 26
Warning tag---------------------------------------------------------------------------------------------------------------------------------2- 26
Keep work place clean and tidy--------------------------------------------------------------------------------------------------------2- 26
Appoint leader when working with others--------------------------------------------------------------------------------------------2- 26
Stop engine before carrying out inspection and maintenance------------------------------------------------------------------2- 26
Two workers for maintenance when engine is running---------------------------------------------------------------------------2- 27
Proper tools---------------------------------------------------------------------------------------------------------------------------------2- 28
Accumulator---------------------------------------------------------------------------------------------------------------------------------2- 28
No unauthorized personnel into area-------------------------------------------------------------------------------------------------2- 28
Attachments---------------------------------------------------------------------------------------------------------------------------------2- 28
Work under machine----------------------------------------------------------------------------------------------------------------------2- 29
Noise------------------------------------------------------------------------------------------------------------------------------------------2- 29
Precautions when using hammer------------------------------------------------------------------------------------------------------2- 29
Repair welding -----------------------------------------------------------------------------------------------------------------------------2- 29
Removing battery terminal --------------------------------------------------------------------------------------------------------------2- 29
Precautions when using high-pressure grease to adjust track tension-------------------------------------------------------2- 30
Do not disassemble recoil spring---------------------------------------------------------------------------------------------­ Precaution with high-pressure oil------------------------------------------------------------------------------------------------------2- 30
Precaution for high fuel pressure------------------------------------------------------------------------------------------------------2- 30
Handling high-pressure hoses----------------------------------------------------------------------------------------------------------2- 31
Precaution for high voltage--------------------------------------------------------------------------------------------------------------2- 31
Waste material -----------------------------------------------------------------------------------------------------------------------------2- 31
Maintenance for air-conditioner--------------------------------------------------------------------------------------------------------2- 31
Compressed air----------------------------------------------------------------------------------------------------------------------------2- 31
Periodic replacement of safety critical parts ----------------------------------------------------------------------------------------2- 32

--------2- 30

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SAFETY LABELS

SAFETY

SAFETY LABELS

The following warning signes 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 signes 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

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SAFETY

SAFETY LABELS

(1) Precautions for operation, inspection and

maintenance (09651-03001)

SAFETY LABELS

(2) Precautions when traveling in reverse

(09802-13000)

(3) Precautions for leaving the operator's seat

(09654-33001)

(4) Precautions for high-temperature cooling water

(09668-03001)

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SAFETY LABELS

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

SAFETY

(6)Precautions for handling accumulator

(7) Precautions for check and adjust track tension

(09657-03003)

Safety label is attached to the back side of the inspection cover of the track frame.

(8) Precautions for handling electric wires

(09808-03000)

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SAFETY

(9) Caution for engine running (09667-03001) (10) Caution for approach when machine moving

(09812-13000)

(11) Jump start prohibited (09842-A0481) (12) Precautions when handling battery

SAFETY LABELS

2 - 7

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SAFETY LABELS

(11) ROPS (09620-B2000) (12) FOPS (09620-C2000)

SAFETY

2 - 8

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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 abnormality 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 abnormality 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

they

are

damaged.

Understand

Never

remove

the

guards

method

any

and

safety

covers

of

use

features.

of

are

safety

Always

in

their

features

keep

proper

and

them

position.

use

them

in

good

Have

guards

properly.

operating

and

covers

condition.

repaired

immediately

if

2 - 9

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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 (such as when
adjusting the operator's seat), lower the work equipment
completely to the ground, set safety lock lever (1) and parking
lever (2) 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 safety lock lever (1) and parking
lever (2) 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

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SAFETY

GENERAL PRECAUTIONS

HANDRAILS AND STEPS

To prevent personal injury caused by slipping or falling off the machine, always do as follows.

Use the handrails and steps marked by arrows in the diagram on
the right when getting on or off the machine.

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 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 onthe workequipment, or other attachments. There is a hazard of fallingand suffering serious
injury.

CRUSHING OR CUTTING PREVENTION

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

2 - 11

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GENERAL PRECAUTIONS

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.

SAFETY

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

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SAFETY

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.

GENERAL PRECAUTIONS

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

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 be reduced. When
modifying, 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 if ROPS is installed, it does not work normally, if your seat belt is not fastened. Be sure to fasten your seat
belt when operating machine.

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.

2 - 13

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GENERAL PRECAUTIONS

SAFETY

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 action to prevent unauthorized people from approaching
the jobsite.
When working on public roads, position flagmen and erect
barriers to ensure the safety of passing traffic and pedestrians.
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.

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.

2 - 14

.

SAFETY

SAFETY

SAFETY

GENERAL PRECAUTIONS

GENERAL PRECAUTIONS

GENERAL PRECAUTIONS

Even going close to high-voltage cables can cause electric
shock, which may cause serious burns or even death. Always
maintain a safe distance (see the table on the right) between the
machine and the electric cable. Check with the local power
company about safe operating procedure before starting
operations.
To prepare for any possible emergencies, wear rubber shoes
and gloves. Lay a rubbersheet on top of the seat, and be careful
not to touch the chassis with any exposed part of your body.
Use a signalman to give warning if the machine approaches too
close to the electric cables.
When 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.

Voltage of Cables Safety Distance

100 V - 200 V Over 2 m (7ft)

6,600 V Over 2 m (7ft)

22,000 V Over 3 m (10 ft)

66,000 V Over 4 m (14 ft)

154,000 V Over 5 m (17 ft)

187,000 V Over 6 m (20 ft)

275,000 V Over 7 m (23 ft)

500,000 V Over 11 m (36 ft)

ENSURE GOOD VISIBILITY

Check for any persons or obstacles in the areaaround 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.

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.

EMERGENCY EXIT FROM OPERATOR'S CAB

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

2 - 15

.

GENERAL PRECAUTIONS

SAFETY

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

STARTING ENGINE

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

PRECAUTIONS FOR OPERATION

CHECKS BEFORE STARTING ENGINE

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

Remove all dirt from the surface of the window glass to ensure a good view.
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'sseat 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.
Adjust the mirror to a position which gives a good view to the rear from the operator's seat.
Check that there are no persons or obstacles above, below, or in the area around the machine.

PRECAUTIONS WHEN STARTING

Start and operate the machine only while seated.
Do not attempt to start the engine by short-circuiting the engine starting circuit. Such an act may cause a serious
bodily injury or fire.
When starting the engine, sound the horn as a warning.
Do not allow anyone apart from the operator to ride on the machine.

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.

2 - 17

.

PRECAUTIONS FOR OPERATION

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.

SAFETY

2 - 18

.

SAFETY

PRECAUTIONS FOR OPERATION

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.
Fix the operator's compartment doors and windows in position
securely.
If there is an area to the rear of the machine which cannot be
seen, position a signal person. Take special care not to hit other
machines or people when turning or swinging the machine.

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

PRECAUTIONS WHEN TRAVELING

When traveling on level ground, keep the work equipment at a
height of 40 to 50 cm (1.6 to 2.0 in) from the ground.
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.

2 - 19

.

SAFETY

PRECAUTIONS FOR OPERATION

PRECAUTIONS FOR OPERATION

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.

SAFETY

TRAVELING ON SLOPES

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

Keep the work equipment approx. 20 to 30 cm (8 to 12 in) above

the ground. In case of emergency, lower the work equipment to

the ground immediately to help stop the machine.

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 traveling down a slope, always place the transmission in

low speed and travel down the slope slowly.

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. If necessary, use the brake pedal at the same time.

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.

2 - 20

.

SAFETY

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-coveredslopes, 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.

PRECAUTIONS FOR OPERATION

PARKING MACHINE

Park 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.

When leaving the machine, set the steering, directional andgear
shift levers in the N(Neutral) position and set the blade lever in
the HOLD position, then apply safety lock lever (1) and parking
lever (2) and stop the engine.
Always close the operator's cab door, and use the key to lock all
the equipment in order to prevent any unauthorizedperson from
moving the machine. Always remove the key, take it with you,
and leave it in the specified place.

If it is necessary to park the machine on a slope, always do as
follows.

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

2 - 21

.

PRECAUTIONS FOR OPERATION

SAFETY

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.

LOADING AND UNLOADING

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

Perform loading and unloading on firm, level ground only.

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

Always use ramps of adequate strength. Be sure that the ramps

are wide, long, and thick enoughto provide a safe loading slope.

Take suitable steps to prevent the ramps from moving out of

position or coming off.

Be sure the ramp surface is clean and free of grease, oil, ice and

loose materials. Remove dirt from machine-tracks. On a rainy

day, in particular, be extremely careful since the ramp surface is

slippery.

Run the engine at low speed and travel slowly.

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

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

ramps again.

The center of gravity of the machine will chenge suddenly at the joint between the ramps and the track or trailer,

and there is danger of the machine losing its balance. Travel slowly over this point.

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

grade.

For machines equipped with a cab, always lock the door after boarding the machine. If this is not done, the door

may suddenly open during transportation.

Refer to "TRANSPORTATION (PAGE 3-116)".

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 enoughto support

the weight of the machine. When traveling on public roads, check first with the relevantauthorities and follow their

instructions.

For details of the shipping procedure, see "TRANSPORTATION (PAGE 3-116)" in the OPERATION section.

2 - 22

.

SAFETY

PRECAUTIONS FOR OPERATION

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.

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

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2 - 23

.

PRECAUTIONS FOR OPERATION

STARTING WITH BOOSTER CABLE

If any mistake is made in the method of connecting the booster
cables, it may cause the battery to explode, so always do as
follows.

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 details of the starting procedure when using booster cables,

see "STARTING ENGINE WITH BOOSTER CABLE (PAGE

3-130)" in the OPERATION section.

SAFETY

2 - 24

.

SAFETY

PRECAUTIONS FOR OPERATION

TOWING

WHEN TOWING

Serious injury or death could result if a disabled machine is towed incorrectly or if there is a mistake in the selection
or inspection of the wire rope.
For towing method, see section "MACHINE TOWING METHOD (PAGE 3-127)".

Always wear leather gloves when handling wire rope.
Connect a wire rope to the part indicated with the arrow in the
diagram at right.
During the towing operation, never stand between the towing
machine and the machine being towed.
Never tow a machine on a slope.

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

2 - 25

.

PRECAUTIONS FOR MAINTENENCE

PRECAUTIONS FOR MAINTENENCE

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 this warning tag in the tool box while it is not used. If there

is no toolbox, keep the tag in the operation manual pocket.

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.

SAFETY

KEEP WORK PLACE CLEAN AND TIDY

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

APPOINT LEADER WHEN WORKING WITHOTHERS

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

STOP ENGINE BEFORE CARRYING OUT INSPECTION AND MAINTENANCE

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.

2 - 26

.

SAFETY

SAFETY

Set safety lock lever (1) and parking lever (2) to the LOCK
position.

Put blocks under the track to prevent the machine from moving.

PRECAUTIONS FOR MAINTENENCE

PRECAUTIONS FOR MAINTENENCE

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.

Set safety lock lever (1) and parking lever (2) to the LOCK
position.
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.

2 - 27

.

PRECAUTIONS FOR MAINTENENCE

PROPER TOOLS

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

ACCUMULATOR

The accumulator is charged with high-pressure nitrogen gas.
When handling the accumulator, careless procedure may cause
an explosion which could lead to serious injury or 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.

SAFETY

NO UNAUTHORIZED PERSONNEL INTO AREA

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

ATTACHMENTS

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 - 28

.

SAFETY

PRECAUTIONS FOR MAINTENENCE

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 maintenanceof 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 - 29

.

PRECAUTIONS FOR MAINTENENCE

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 plug (1) may fly out and cause

serious injury or property damage.

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

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

drain plug slowly.

Never put your face, hands, feet, or any other part of your body

close to grease drain plug (1).

SAFETY

DO NOT DISASSEMBLE RECOIL SPRING

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

PRECAUTION WITH HIGH-PRESSURE OIL

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

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

If there is any leakage from the pipingor 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 youare hit bya jet of high-pressureoil 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

High pressure is generated inside the engine fuel piping when the engine is running. When carrying out inspection
or maintenance of the fuel piping system, wait for at least 30 seconds after stopping the engine to let the internal
pressure go down before starting inspection or maintenance.

2 - 30

.

SAFETY

PRECAUTIONS FOR MAINTENENCE

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 anyloose bolts are found, stop work and tighten to the specified torque. If any damagedhoses arefound,
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 or immediately after it has stopped,
high voltage is generated at the injector terminal and inside the
engine controller, so there is danger of electrocution. Never touch
the injector terminal or the inside of the engine controller.
If it is necessary to touch the injector terminal or the inside of the
engine controller, please contact your Komatsu distributor.

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 causeblindness; 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.

2 - 31

.

PRECAUTIONS FOR MAINTENENCE

SAFETY

PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS

In order for the machine to be operated safety for a long time, it is necessary to add oil and to carry out service

and maintenance at periodic intervals. In order to further increase safety, components with a strong relationship

to safety, such as hoses and seat belts, must be replaced at periodic intervals.

Replacement of safety critical parts: See "PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS

(PAGE 4-15)".
The material of these components naturallychanges 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 - 32

.

3 - 1

.

GENERAL VIEW

GENERAL VIEW

GENERAL VIEW OF MACHINE

Machine equipped with cab

OPERATION

Machine equipped with canopy

(1) Blade
(2) Tilt cylinder
(3) Lift cylinder
(4) Cab
(5) ROPS canopy

(6) Track shoe
(7) Sprocket
(8) Track frame
(9) Push arm
(10) Idler

3 - 2

.

OPERATION

GENERAL VIEW OF CONTROLS AND GAUGES

Machine equipped with cab

GENERAL VIEW

(1) Parking brake lever
(2) Safety lock lever
(3) Cigarette lighter
(4) Fuel control dial
(5) Joystick (Steering, directional and gear shift lever)
(6) Auto shift down switch
(7) Preset mode switch
(8) Head lamp switch
(9) Air conditioner panel or heater panel
(10) Monitor panel
(11) Rear lamp switch

(12) Fan rotation selector switch
(13) Starting switch
(14) Information switch
(15) Buzzer cancel switch
(16) Brake pedal
(17) Deceleration pedal
(18) Blade control lever
(19) Horn switch
(20) Ripper control lever (if equipped)
(21) Wiper switch
(22) Room lamp switch

3 - 3

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GENERAL VIEW

Machine equipped with canopy

OPERATION

(1) Parking brake lever
(2) Safety lock lever
(3) Fuel control dial
(4) Joystick (Steering, directional and gear shift lever)
(5) Auto shift down switch
(6) Preset mode switch
(7) Head lamp switch
(8) Monitor panel
(9) Rear lamp switch

3 - 4

(10) Fan rotation selector switch
(11) Information switch
(12) Buzzer cancel switch
(13) Starting switch
(14) Brake pedal
(15) Deceleration pedal
(16) Blade control lever
(17) Horn switch
(18) Ripper control lever (if equipped)

.

OPERATION

MONITOR PANEL

GENERAL VIEW

(1) Display panel A (Speed range, Engine speed)
(2) Power train oil temperature gauge
(3) Engine coolant temperature gauge
(4) Hydraulic oil temperature gauge
(5) Fuel gauge
(6) Hydraulic oil temperature caution lamp
(7) Power train oil temperature caution lamp
(8) Fan operation confirmation lamp

(9) Filter, oil change interval lamp
(10) Warning lamp
(11) Engine coolant temperature caution lamp
(12) Maintenance caution lamp
(13) Engine preheating pilot lamp
(14) Engine oil pressure caution lamp
(15) Charge caution lamp
(16) Display panel B (Multi-information)

3 - 5

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EXPLANATION OF COMPONENTS

OPERATION

EXPLANATION OF COMPONENTS

The following is an explanation of the devices needed for operating the machine.
To perform suitable operations correctly and safely, it is important to completely understand the methods of
operating equipment and meanings of the displays.

FRONT PANEL

A: Emergency caution group
B: Caution group
C: Meter group

D: Lamp
E: Switch

3 - 6

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OPERATION

EXPLANATION OF COMPONENTS

CHECK MONITOR SYSTEM

MONITOR SYSTEM

NOTICE

Stop the machine on level ground and carry out the monitor check.
Stop the engine, then turn the starting switch to the ON position and check that the lamps light up for approx. 2 seconds. If
they do not light up, please ask your Komatsu distributor to carry out inspection.
The monitor check cannot be carried out until at least 5 seconds has passed after the engine was stopped.

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

Turn the starting switch to the ON position.

1.
Check that the monitor liquid-crystal display and the lamps all

2.
light up for 2 seconds, that the alarm buzzer sounds for 2
seconds, and that "KOMATSU SYSTEM CHECK" is displayed
for 3 seconds on display panel B (multi-information) (1).

3. After 2 seconds, the current status of the machine is

displayed on liquid-crystal display (2).
After 2 seconds, the lamp portion (3) goes out.
After 3 seconds, the operating mode is displayed on display
panel B (multi-information) (1).

REMARK

The following cases do not indicate any abnormality.

If the preheating heater is actuated in cold weather, HEAT lamp
(4) does not go out until the preheating is completed.
If the oil or filter replacement interval has been reached,
maintenance caution lamp (5) or filter oil replacement interval
lamp (6) light up or flash for 30 seconds, and the action code is
displayed on display panel B (multi-information) (1).

3 - 7

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EXPLANATION OF COMPONENTS

OPERATION

EMERGENCY CAUTION ITEMS

CAUTION

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

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

(1) Engine oil pressure caution lamp
(2) Engine coolant temperature caution lamp

3 - 8

(3) Power train oil temperature caution lamp
(4) Hydraulic oil temperature caution lamp

.

OPERATION

ENGINE OIL PRESSURE MONITOR

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 abnormality.

ENGINE COOLANT TEMPERATURE MONITOR

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.

EXPLANATION OF COMPONENTS

POWER TRAIN OIL TEMPERATURE MONITOR

This lamp (3) indicates a rise in the oil temperature of the torque
converter outlet.
When the monitor lamp flashes, run the engine at the low idling
speed until the green range of the power train oil temperature
gauge lights.

HYDRAULIC OIL TEMPERATURE MONITOR

Lamp (4) indicates a rise in the hydraulic oil temperature.
When the monitor lamp flashes, stop the machine and run the
engine at the low idling speed until oil temperature falls.

3 - 9

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EXPLANATION OF COMPONENTS

OPERATION

CAUTION MONITOR GROUP

CAUTION

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

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

(1) Charge level monitor (2) Maintenance caution lamp

CHARGE MONITOR

This lamp (1) indicates an abnormality inthe chargingsystem while
the engine is running.
If the monitor lamp flashes, check the V-belt tension. If any
abnormality is found, see "OTHER TROUBLE (PAGE 3-132)".

REMARK

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

3 - 10

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OPERATION

MAINTENANCE CAUTION LAMP

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

After replacing the indicated filter or oil displayed on display panel
B (multi-information),reset the interval. Fordetails, see "METHOD
OF USING OIL AND FILTER MAINTENANCE MODE (PAGE
3-26)".
The lamp goes out.

REMARK

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

EXPLANATION OF COMPONENTS

3 - 11

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EXPLANATION OF COMPONENTS

METER GROUP

OPERATION

(1) Engine coolant temperature gauge
(2) Power train oil temperature gauge
(3) Hydraulic oil temperature gauge
(4) Fuel gauge

(5) Engine preheating pilot lamp
(6) Display panel A

(Speed range display, Engine speed)

(7) Display panel B (multi-information)

ENGINE COOLANT TEMPERATURE GAUGE

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

Gauge (1) indicates temperature of the engine coolant.
If the temperature is normal during operation, green range (B) will
light.
If red range (C) lights during operation, move the fuel control dial to
lower engine speed tp approx. 3/4 of the full speed, and run until
the coolant temperature enters green range (B).
If red range (C) lights up during operation, and the engine coolant
temperature caution lamp flashes and the alarm buzzer sounds,
stop the machine, run the engine at low idle, and wait for the
coolant temperature to return to green range (B).
(A): White range
(B): Green range
(C): Red range

3 - 12

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OPERATION

EXPLANATION OF COMPONENTS

POWER TRAIN OIL TEMPERATURE GAUGE

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

Gauge (2) indicates the torque converter outlet oil temperature.
If the temperature is normal during operation, green range (B) will
light.
If red range (C) lights up during operation, move the fuel control
lever to lower engine speed to approx. 3/4 of the full speed, reduce
the load and run until the oil temperature enters green range (B).
If red range (C) lights up during operation, and the power train oil
temperature caution lamp flashes and the alarm buzzer sounds,
stop the machine, run the engine at low idle, and wait for the oil
temperature to go down to green range (B).
(A): White range
(B): Green range
(C): Red range

HYDRAULIC OIL TEMPERATURE GAUGE

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

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 60 liters
(15.85 US gal) of fuel remaining.

3 - 13

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EXPLANATION OF COMPONENTS

ENGINE PREHEATING PILOT LAMP

This lamp (5) indicates that the engine is being preheated with an
electric heater in cold weather.
When the engine starting switch is turned to the ON position, the
engine controller detects the engine coolant temperature and
automatically starts to preheat the engine at low temperature.

DISPLAY PANEL A (speed range display, engine speed)

Meter (6) displays the transmission speed range being used on the
machine and engine speed.

The travel direction (A) and speed range (B) are displayed in the
center of the speed range display.
(A) F: FORWARD
R: REVERSE
N: Neutral
P: Parking lever at LOCK position
(B) 1: 1st
2: 2nd
3: 3rd

Example: F1 is displayed for FORWARD 1st

OPERATION

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

3 - 14

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OPERATION

EXPLANATION OF COMPONENTS

DISPLAY PANEL B (multi-information)

The top and bottom lines in display panel B (multi-information) display information related to the condition of the
machine.
The content of the display is divided into "OPERATING MODE" and "MAINTENANCE MODE". Use the buzzer
cancel switch to switch between the operating mode and maintenance mode.
For details of switching the mode, see "BUZZER CANCEL SWITCH (PAGE 3-23)".

OPERATING MODE (default screen)

Use this mode when operating the machine.

REMARK

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

The following information is displayed by the operating mode.
Top line (A): Action code

If any abnormality occurs on the machine, an action
code is displayed. If an action code appears, take the
applicable action. For details, see "OTHER
TROUBLE (PAGE 3-132).
This displays various types of filter or oil replacement
intervals have been reached.

Bottom line, left (B): Preset mode

When the preset mode switch is ON, the
selected preset mode is displayed.
For details of selecting the preset mode, see
"GEARSHIFTING OPERATION USING
PRESET MODE FUNCTION (PAGE 3-96)".

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

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

Service meter
This displays the total number of hours that the machine has been operated. Use the display
to determine the intervals for periodic maintenance.
While the engine is running, the service meter advances, even if the machine is not being
operated.
While the engine is running, the hourglass mark at the side of the meter flashes to show that
the meter is advancing.
The meter advances 0.1h for every 6 minutes that the engine is running, regardless of the
engine speed.

3 - 15

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OPERATION

EXPLANATION OF COMPONENTS

EXPLANATION OF COMPONENTS

Maintenance mode

This displays various types of information related to maintenance
of the machine.
For details, see "METHOD OF USING MAINTENANCE MODE
(PAGE 3-24)".

OPERATION

3 - 16

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OPERATION

LAMPS

EXPLANATION OF COMPONENTS

(1) Warning lamp
(2) Filter, oil change interval lamp

(3) Fan operation confirmation lamp

WARNING LAMP

(Red)

NOTICE
If alarm buzzer sounds, stop work immediatey and perform inspection and maintenance of the appropriate point.

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

When the caution lamp (A) of an emergency warning item flashes,
or when the part of an action code is displayed, the alarm buzzer
sounds continuously at the same time.

3 - 17

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EXPLANATION OF COMPONENTS

FILTER, OIL CHANGE INTERVAL LAMP

(Yellow)
If it is time to replace a filter or changethe oil, this lamp (2) lights up
or flashes for approx. 30 seconds after the starting switch is turned
ON.

REMARK

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

After replacing the indicated filter or oil displayed on display panel
B (multi-information), reset the time. For details, see "METHOD
OF USING OIL AND FILTER MAINTENANCE MODE (PAGE
3-26)".
The lamp goes out or stops flashing.

OPERATION

FAN OPERATION CONFIRMATION LAMP

(Orange)
This lamp (3) flashes when the direction of fan rotation is not
switched even when the switch is operated to reverse the direction
of rotation of the cooling fan or when the hydraulic circuit is in
protected status.
For details, see "FAN ROTATION SELECTOR SWITCH (PAGE
3-22)".

3 - 18

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OPERATION

SWITCHES

Machine equipped with cab

EXPLANATION OF COMPONENTS

Machine equipped with canopy

(1) Starting switch
(2) Auto shift down switch
(3) Preset mode switch
(4) Head lamp switch

(5) Rear lamp switch
(6) Fan rotation selector switch
(7) Information switch
(8) Buzzer cancel switch

3 - 19

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EXPLANATION OF COMPONENTS

OPERATION

STARTING SWITCH

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

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

ON position
In this position, electric current flows in the charging and lamp
circuits.
Keep the starting switch key at the ON position while the engine is
running.

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

AUTO SHIFT DOWN SWITCH

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

(a) (OFF) position: Stopped
(b) (ON) position: Actuated

For details, see "AUTO DOWN SHIFT OPERATION (PAGE
3-97)".

PRESET MODE SWITCH

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

(a) (OFF) position: Stopped
(b) (ON) position: Actuated

For details, see "GEARSHIFTING OPERATION USING PRESET
MODE FUNCTION (PAGE 3-96)".

3 - 20

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OPERATION

HEAD LAMP SWITCH

This switch (4) lights up when the front lamp, left and right working
lamps on the front fender, and panel lamp light up.

(a) OFF position: Lights out
(b) ON position: Lights on

REAR LAMP SWITCH

This switch (5) lights up the rear lamps.

(a) OFF position: Lights out
(b) ON position: Lights on

EXPLANATION OF COMPONENTS

3 - 21

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EXPLANATION OF COMPONENTS

FAN ROTATION SELECTOR SWITCH

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

(a) position: Normal rotation

Normally use this position.
The air is pushed out to the front through the radiator
mask.
The speed of the fan changes to match the
temperature of the coolant in order to improve the
cooling efficiency.

(b) position: Reverse rotation

The fan rotates in the reverse direction.
The air is sucked into the engine room through the
radiator mask. This makes it possible to use the heat
from the radiator to warm the operator's cab.
Operating with the fan rotating in reverse may cause
overheating, so use this function only during cold
weather (ambient temperature below 15°C).

(c) position: Cleaning

The fan rotates in the reverse direction at high speed,
regardless of the coolant temperature.
Use this function to clean the radiator fins.

OPERATION

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

REMARK

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

3 - 22

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OPERATION

INFORMATION SWITCH

This switch (7) is used to operate display panel B
(multi-information).
When the switch is released, it returns automatically to the center
position.

When display panel B (multi-information) is in the operation mode,

turn the switch to (a) or (b) to switch the display to service meter
or engine speed.

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

It is used to move between sub modes, between items, to move
the cursor, or to change values.
For details, see "METHOD OF USING MAINTENANCE MODE
(PAGE 3-24)".

BUZZER CANCEL SWITCH

This switch (8) is used to operate control panel B
(multi-information) or to stop the alarm buzzer.
When the switch is released, it returns automatically to the center
position.

EXPLANATION OF COMPONENTS

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

When the alarm buzzer is sounding, turn this switch to the left
or right to stop the buzzer.
If the switch is held at the (a) position for at least 2.5 seconds,
the display switches to the maintenance mode.

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

(a) position: Cancel or reset to operation mode
(b) position: Confirms selection or selected item
For details, see "METHOD OF USING MAINTENANCE MODE (PAGE 3-24)".

3 - 23

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EXPLANATION OF COMPONENTS

METHOD OF USING MAINTENANCE MODE

To switch from the operation mode to the maintenance mode, turn
the buzzer switch to the (a) position and hold it there for at least 2.5
seconds. The screen will switch to the maintenance mode.
On the first screen, the oil and filter maintenance mode is
displayed.

EXPLANATION OF MODES AND OPERATION

The maintenance mode has the following 4 sub modes.

Sub mode Function Reference items

Oil/filter maintenance mode

Oil or filter replacement time is
displayed

OPERATION

METHOD OF USING OIL AND FILTER
MAINTENANCE MODE(3-26 PAGE)

PM clinic auxiliary mode

Fault code display mode

Adjustment mode Adjusts monitor brightness, etc.

Use information switch (1) and buzzer cancel switch (2) to operate
each mode.

Engine speed or hydraulic circuit
pressure is displayed

Fault codes for electronic control
related parts are displayed

METHOD OF USING PM CLINIC
AUXILIARY MODE(3-28 PAGE)

METHOD OF USING FAULT CODE
DISPLAY MODE(3-29 PAGE)

METHOD OF USING USER ADJUST
MODE(3-30 PAGE)

3 - 24

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OPERATION

METHOD OF SELECTING EACH MODE

EXPLANATION OF COMPONENTS

3 - 25

.

EXPLANATION OF COMPONENTS

OPERATION

METHOD OF USING OIL AND FILTER MAINTENANCE MODE

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

In the oil and filter maintenance mode, the replacement intervals
for oil and filters are displayed on display panel B
(multi-information).
(1) The item is displayed.
(2) The time remaining until replacement is displayed.
(3) The quantity of replacements until now is displayed.

The display items can be displayed in order by operating the
information switch to the left or right (<, >).

Display Item Replacement Interval

1. ENG.OIL Engine oil 500h

2. ENG.FLT Engine oil filter 500h

3. FUEL.FLT Fuel filter 500h

4. HYD.FLT Hydraulic oil filter 2000h

5. CORR.FLT Corrosion resistor 1000h

6. BYPS.FLT Bypass filter (*) 0h

7. DAMP.OIL Damper oil 2000h

8. OIL Final drive oil 1000h

9. HYD.OIL Hydraulic oil 2000h

10. POWL.OIL Power train oil 1000h

11. POWL.FLT Power train oil filter 500h

12. HSS.FLT HSS charge filter (*) 0h

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

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 replacementquantity will increase
by 1, the replacement interval will be reset, and the oil, filter change
interval lamp will go out.
When this is done, if the maintenance caution lamp does not go
out, there is another item close to the replacement time, so check
that item.

3 - 26

.

OPERATION

OPERATION

REMARK

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

EXPLANATION OF COMPONENTS

EXPLANATION OF COMPONENTS

3 - 27

.

EXPLANATION OF COMPONENTS

OPERATION

METHOD OF USING PM CLINIC AUXILIARY MODE

CAUTION

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

The PM clinic auxiliary mode displays the engine speed or hydraulic pressure on display panel B (multi-information).
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 four 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 PRESSURE Boost pressure Pressure (kPa)

03-HYD.PUMP PRES Hydraulic oil pressure Pressure (MPa)*

04-BATTERY VOLT Battery voltage Voltage (V)

* 0.0 MPa is shown as the value for hydraulic oil pressure of the work equipment, as

this machine is not equipped with a sensor for this purpose.

REMARK

Items such as the engine speed fluctuateand aredifficult to see during the measurement. In such cases, operate
the buzzer cancel switch to . This makes it possible to hold the display of the value.
To cancel this mode, operate the buzzer cancel switch again to .
To return to the maintenance mode, operate the buzzer cancel switch to .

3 - 28

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OPERATION

EXPLANATION OF COMPONENTS

METHOD OF USING FAULT CODE DISPLAY MODE

NOTICE
The fault items observed by this function are connected with the electronic control, so even if a fault code is not displayed, there
is probably some problem with the machine. If the operator feels any abnormality 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 displaypanel B (multi-information).When contactingyour 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 (1).
The display is shown repeatedly.

REMARK

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

3 - 29

.

EXPLANATION OF COMPONENTS

OPERATION

METHOD OF USING USER ADJUST MODE

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

Adjusting backlighting of liquid crystal display

1.
The diagram on the right is the mode for adjusting the

1)
brightness of the backlighting of the liquid crystal panel.
This display will be switched to the screen brightness
adjustment display, if the alarm buzzer cancellation switch
is turned to the  position.

2) 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

The brightness of the backlight for the LCD gauges may be

3)
held constant by turning the alarm buzzer cancellation
switch to the  position.

REMARK

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

3 - 30

.

OPERATION

2. Adjusting backlighting of display panel B (multi-information)
The diagram on the right is the mode for adjusting the

1)
brightness of the backlighting of the display panel B
(multi-information).
On the screen, operate the buzzer cancel switch to  to
switch to the screen for adjusting the brightness.

The brightness can be adjusted by operating the

2)
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

EXPLANATION OF COMPONENTS

3) When the buzzer cancel switch is operated to , the
brightness of the display panel B (multi-information)
backlighting is set.

REMARK

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

3 - 31

.

EXPLANATION OF COMPONENTS

3. Adjusting contrast of liquid crystal display panel B (multi-information)
The diagram on the right is the mode for adjusting the

1)
contrast of the liquid crystal display panel B
(multi-information).
On this screen, operate the buzzer cancel switch to  to
switch to the screen to adjust the contrast.

The contrast can be adjusted by operating the information

2)
switch.
The higher the number, the deeper the screen becomes;
the lower the number, the lighter the screen becomes.
> position: Number increases
< position: Number decreases

OPERATION

3) When the buzzer cancel switch is operated to , the
contrast of the liquid crystal display panel B
(multi-information) is set.

REMARK

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

3 - 32

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OPERATION

SWITCHES

Machine equipped with cab

EXPLANATION OF COMPONENTS

Machine equipped with canopy

(1) Fuel control dial
(2) Horn switch
(3) Room lamp switch

(4) Wiper switch
(5) Cigarette lighter
(6) Accessory socket

3 - 33

.

EXPLANATION OF COMPONENTS

FUEL CONTROL DIAL

Dial (1) is used to control the engine speed and output.
(a) Low idling position: Turn fully to the left
(b) High idling position: Turn fully to the right

HORN SWITCH

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

OPERATION

ROOM LAMP SWITCH

This (3) illuminates the room lamp.
OFF position: Lamps are out
ON position: Lamps light up

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OPERATION

WIPER SWITCH

This (4) activates the wipers.
The wiper switches are as follows:
(LH) Left door
(FF) Front window
(RH) Right door
(RR) Rear window
(INT) Wiper intermittent operation switch

This is also used as the window washer switch.
The switch is operated as follows.

Wiper only
If this is switched on, the wiper will start.

EXPLANATION OF COMPONENTS

Wiper and window washer
If this is kept pressed to the ON position while the wiper is
working, water will be sprayed out.

REMARK

When the wiper intermittent operation switch is ON, if the wiper switch for each window is turned ON, the wiper will
move intermittently.

CIGARETTE LIGHTER

This (5) 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.
If the cigarette lighter is removed, the socket can be used as a
power source.

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

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EXPLANATION OF COMPONENTS

ACCESSORY SOCKET

This (6) is used as the power source for a wireless or other 12V
equipment.

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

OPERATION

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OPERATION

CONTROL LEVERS AND PEDALS

(1) Safety lever
(2) Parking lever
(3) Joystick (steering, directional and gear shift lever)

EXPLANATION OF COMPONENTS

(4) Brake pedal
(5) Deceleration pedal
(6) Blade control lever

SAFETY LOCK LEVER

WARNING

When leaving the operator's seat, always set the safety lock lever securely in the LOCK position.
If the work equipment control levers are not locked and are they are touched by accident, it may lead to serious injury.
If the safety lock leveris not set securely in theLOCK position, the work equipment control levers may move and cause serious
injury. Check that it is in the position shown in the diagram.
When parking the machine or when carrying out maintenance, always lower the work equipment to the ground, then set the
safety lever in the LOCK position.

This lever (1) is a lock device for the work equipment control levers.
When it is set to the LOCK position, operation of the work
equipment is locked.

REMARK

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

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EXPLANATION OF COMPONENTS

OPERATION

PARKING LEVER

WARNING

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

This lever (2) operates the parking brake. The parking brake is
applied when it is in the LOCK position.

REMARK

Before moving the parking lever to the LOCK position, return
the steering, directional, and gearshift lever to the N position.
When starting the engine, if the parking lever is not in the LOCK
position, the limit switch is actuated and it is impossible to start
the engine.

JOYSTICK (STEERING, DIRECTIONAL AND GEAR SHIFT LEVER)

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

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

REMARK

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

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OPERATION

OPERATION

EXPLANATION OF COMPONENTS

EXPLANATION OF COMPONENTS

Gear shifting

When switch (c) or switch (d) is pushed, the transmission speed
will change.
UP switch (c): Each time the switch is pressed, the transmission

will up shift one speed.

DOWN switch (d): Each time the switch is pressed, the

transmission will down shift 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 panel A on the monitor panel according to the gearshift operation.
<Example>
Neutral: N is displayed on the display panel.
FORWARD 2nd: F2 is displayed on the display panel.
REVERSE 3rd: R3 is displayed on the display panel.
When the parking lever is locked, P is displayed.
For details of the method of shifting gears according to the shift mode, see the "SHIFTING GEARS (PAGE
3-95)". Shift mode selection means that the selected speed range is displayed at the N position before starting.

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 operatedfurther, the speed of the counterrotationturn
will increase.
(R): Right counterrotation turn
(L): Left counterrotation turn

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EXPLANATION OF COMPONENTS

BRAKE PEDAL

WARNING

Do not place your foot on this pedal unnecessarily.

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

OPERATION

DECELERATOR 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.

This pedal (5) is used when reducing the engine speed or stopping
the machine.
When switching between forward and reverse, or when stopping
the machine, use this pedal to reduce speed.

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OPERATION

BLADE CONTROL LEVER

POWER TILTDOZER

This lever (6) is used to lift 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

If the lever is in the FLOAT position, even when it is released,
it does not return to the HOLD position, so return it by hand.
If the engine is stopped when the control lever is in the FLOAT
position, the lever is returned automatically to the HOLD
position.
In low temperatures, it may take a short time for the blade
control lever to be held in the FLOAT position, so hold the lever
in position for at least 1 second.

EXPLANATION OF COMPONENTS

Tilting control
(b) HOLD: Blade is stopped and held in this position.
(e) LEFT TILT
(f) RIGHT TILT

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EXPLANATION OF COMPONENTS

POWERTILT POWER PITCHDOZER

This lever (6) is used to lift or tilt and pitch 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

If the lever is in the FLOAT position, even when it is released,
it does not return to the HOLD position, so return it by hand.
If the engine is stopped when the control lever is in the FLOAT
position, the lever is returned automatically to the HOLD
position.
In low temperatures, it may take a short time for the blade
control lever to be held in the FLOAT position, so hold the lever
in position for at least 1 second.

OPERATION

Tilting control
(b) HOLD: Blade is stopped and held in this position.
(e) LEFT TILT
(f) RIGHT TILT

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OPERATION

OPERATION

Pitch control
First set the lever to the neutral position, then keep switch (A)
in the center of the knob pushed down and carry out the tilt
operation to change the cutting angle of the blade.
(b) HOLD: Blade is stopped and held in this position.
(e) REAR PITCH: Min. digging angle
(f) FORWARD PITCH: Max. digging angle

EXPLANATION OF COMPONENTS

EXPLANATION OF COMPONENTS

Precautions when using pitch control
When using the pitch operation, the tilt operation changes as follows.

Pitch condition Tilt operation Amount of tilt

Max.forward
pitch

Forward pitch

Standard pitch

Rear pitch

Max. rear

pitch

Only left tilt
operation is possible

Both left and right
tiltoperations are
possible

Only right tilt
operation is possible

Max. 890mm (35.1 in)

Compared with
standard:
LEFT tilt is LARGER
RIGHT tilt is SMALLER

460mm (18.1 in) (both
left and right)

Compared with
standard:
LEFT tilt is SMALLER
RIGHT tilt is LARGER

Max. 890mm (35.1 in)

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EXPLANATION OF COMPONENTS

ANGLE DOZER

This lever (6) is used to lift 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

If the lever is in the FLOAT position, even when it is released,
it does not return to the HOLD position, so return it by hand.
If the engine is stopped when the control lever is in the FLOAT
position, the lever is returned automatically to the HOLD
position.
In low temperatures, it may take a short time for the blade
control lever to be held in the FLOAT position, so hold the lever
in position for at least 1 second.

OPERATION

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OPERATION

EXPLANATION OF COMPONENTS

CIRCUIT BREAKER

NOTICE

When resetting the circuit breaker, always turn off the power first (turn the starting switch OFF).
If the reset button for the circuit breaker comes out immediately when it is pushed in, it is necessary to carryout an inspection
of the electrical circuit.

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

REMARK

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

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

1.
breakers (1) and (2) can be seen.
(Circuit breaker (2) is installed only on machines equipped with
an air conditioner.)
When the circuit breaker has cut off the circuit, reset button (3)

2.
springs out.
Push reset button (3) in.

No

(1) 20A Starting switch

(2) 20A Air conditioner

Fuse

capacity

Circuit

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.

EXPLANATION OF COMPONENTS

OPERATION

FUSE

NOTICE
Before replacing a fuse, be sure to turn ignition switch to the OFF position.

The fuses protect the electrical equipment and wiring from burning out.
If the fuse becomes corroded, or white powder can be seen, or the fuse is loose in the fuse holder, replace the fuse.
Replace the fuse with another of the same capacity.

Chassis

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

Cab (machines equipped with cab)

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

FUSE CAPACITY AND CIRCUIT NAME

Fuse box (A)

NO.

(1) 20A Spare power source

(2) 10A

(3) 20A Front lamp, Rear lamp

(4) 20A

(5) 10A Continuous power source

Fuse

capacity

Circuit

Horn, Engine preheater heater
PTP valve

Transmission,
Steering controller

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OPERATION

Fuse box (B)

NO.

(1) 15A Monitor panel

(2) 20A Fuel pump

(3) 30A Air conditioner

(4) 10A Backup alarm

(5) 30A Body power source

Fuse box (C)

NO.

(1) 10A Radio memory

(2) 20A Radio, lamp,cigarette lighter

(3) 20A Heated glass (if equipped)

(4) 10A Rear wiper

(5) 10A Front wiper

(6) 10A Left and right door wiper

Fuse

capacity

Fuse

capacity

Circuit

Circuit

EXPLANATION OF COMPONENTS

FUSIBLE LINK

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

REMARK

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

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

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OPERATION

EXPLANATION OF COMPONENTS

EXPLANATION OF COMPONENTS

Fusible link (2)
Open the engine side cover on the right side of the machine.
Fusible link (2) can be seen under the window washer tank.
Capacity: 120 A

OPERATION

ELECTRIC POWER TAKE-OUT ADAPTER

MACHINE EQUIPPED WITH CAB

NOTICE
The powerfor the cigarette lighter is24V. Do not use itas the power source
for 12V equipment.

The cigarette lighter socket (1) can be used as a power source for
24V equipment and the accessory socket (2) can be used for 12V
equipment.
Capacity of cigarette lighter : 120W (24V x 5A)
Capacity of accessory socket : 60W (12V x 5A)

MACHINE EQUIPPED WITH CANOPY

NOTICE

Do not use as a power supply for 12V equipment.

This will cause failure of the equipment.

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

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

1.

2. There is the connector for the spare power take-off.
(Connector CN800 (3) can be used.)

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OPERATION

DOOR - OPEN LOCK

(Machines equipped with cab)
Use this when your want to keep the door held open.

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

To release the door, move lever (2) inside the cab to the front

2.
of the cab. This will release the catch.

NOTICE

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

EXPLANATION OF COMPONENTS

SASH GLASS INTERMEDIATE LOCK

(Machines equipped with cab)
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 in the LOCK position, the glass is held in
position.

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EXPLANATION OF COMPONENTS

DOOR POCKET

(Machines equipped with cab)
This is inside the left and right doors. Use it for storing the
Operation and Maintenance Manual or other things.
Do not put heavy tools or other heavy objects in it.
If the pocket is dirty, turn 4 clips (1), then remove the pocket and
rinse it.

OPENING AND CLOSING ENGINE SIDE COVER

When opening

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

OPERATION

When closing

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

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

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OPERATION

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

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

EXPLANATION OF COMPONENTS

SHOVEL HOLDER

(If equipped)
This can be used for storing a shovel with a rounded blade.

Method of installing

Position the shovel with stopper(1) and holder(2).

1.

2. Tighten the adjustment nut (3) so the shovel does not move.

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EXPLANATION OF COMPONENTS

CAR STEREO, HANDLING

(Machine equipped with cab) (If equipped)

EXPLANATION OF COMPONENTS

OPERATION

(1) Power switch/volume
(2) Auto-store/preset scan button
(3) Bass control knob
(4) Treble control knob
(5) Loudness button
(6) Time/radio display selector button
(7) Tape eject button

(A) Band display
(B) Metal tape display
(C) FM stereo reception display
(D) Loudness display

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(8) Cassette door
(9) Fast forward, rewind buttons
(10) Preset buttons
(11) Metal tape button
(12) Manual tuning buttons
(13) Seek tuning buttons
(14) Band selector button

(E) Tape direction display
(F) Preset channel display
(G) Time/frequency display

.

OPERATION

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.

EXPLANATION OF COMPONENTS

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

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