Komatsu HM300-2 Service Manual
ARTICULATED
DUMP TRUCK
HM300
PEN00101-04
-2
SERIAL NUMBERS
NOTICE
Komatsu has Operation & Maintenance Manuals written
in some other languages. if a foreign language manual
is necessary, contact your local distributor for
availability.
2001
and up
WARNING
Unsafe Use of this machine may cause serious injury or
Death.Operators and maintenance personnel must read
this manual before operating or maintaining this machine.
This manual should be kept near the machine for
reference and periodically reviewed by all personnel
who will come into contact with it .
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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 in 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 towhich it has been 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:
On inside of left door
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FOREWORD
FOREWORD
1 - 3
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FOREWORD
FOREWORD
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FOREWORD
SAFETY INFORMATION
SAFETY INFORMATION
To enable you to use this machine safely, safety precautions and labels are given in this manual and affixed to the
machine to give explanations of situations involving potential hazards and of the methods of avoiding such
situations.
Signal words
The following signal words are used to inform you that there is a potential hazardous situation that may lead to
personal injury or damage.
In this manual and on machine labels, the following signal words are used to express the potential level of hazard.
Indicates an imminently hazardous situation which, if not avoided, will result in death or
serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
Indicates a potentially hazardous situation which, if not avoided, may result in minor or
moderate injury. This word is used also to alert against unsafe practices that may cause
property damage.
Example of safety message using signal word
WARNING
When standing up from the operator's seat, always place the lock lever in the LOCK position.
If you accidentally touch the control levers when they are not locked, this may cause a serious injury or death.
Other signal words
In addition to the above, the following signal words are used to indicate precautions that should be followed to
protect the machine or to give information that is useful to know.
This word is used for precautions that must be taken to avoid actions which could shorten
the life of the machine.
This word is used for information that is useful to know.
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SAFETY INFORMATION
Safety labels
Safety labels are affixed to the machine to informthe 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
FOREWORD
Safety labels using pictogram
Safety pictograms use a picture to express a level of hazardous
condition equivalent to the signal word. These safety pictograms
use pictures in order to let the operator or maintenance worker
understand the level and type of hazardous condition at all times.
Safety pictograms show the type of hazardous condition at the top
or left side, and the method of avoiding the hazardous condition at
the bottom or right side. In addition, the type of hazardous condition
is displayed inside a triangle and the method of avoiding the
hazardous condition is shown inside a circle.
Komatsu cannot predict every circumstance that might involve a potential hazard in operation and maintenance.
Therefore, the safety messages in this manual and on the machine may not include all possible safety precautions.
If any procedures or actions not specifically recommended or allowed in this manual are used, it isyour 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 distributorfor 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 J (1))
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FOREWORD
INTENDED USE
DIRECTIONS OF MACHINE
INTENDED USE
In this manual, the directions of the machine (front, rear, left, right) are determined according to the view from the
operator's seat in the direction of travel (front) of the machine.
(D)
(A)
(B)
(C)
FRONT
REAR
LEFT
RIGHT
(E)
OPERATOR'S SEAT
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LOCATION OF PLATES, TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
FOREWORD
LOCATION OF PLATES, TABLE TO ENTER SERIAL NO. AND
DISTRIBUTOR
When requesting service or ordering replacement parts, please inform your Komatsu distributor of the following
items.
PRODUCT IDENTIFICATION NUMBER (PIN)/MACHINE SERIAL NO. PLATE
This is at the rear right of the cab.
The design of the nameplate differs according to the territory.
EPA REGULATIONS, ENGINE NUMBER PLATE
It is located on the upper left side of the engine cylinder block if you look from the fan side.
EPA: Environmental Protection Agency, U.S.A.
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FOREWORD
LOCATION OF PLATES, TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
SERVICE METER POSITION
It is at the center bottom of the machine monitor.
TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR
Machine serial No.
Engine serial No.
Product identification number (PIN)
Distributor name
Address
Service Personnel
Phone/Fax
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CONTENTS
FOREWORD
CONTENTS
FOREWORD 1- 1
FOREWORD 1- 2
SAFETY INFORMATION 1- 5
INTENDED USE 1- 7
DIRECTIONS OF MACHINE 1- 7
LOCATION OF PLATES, TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR 1- 8
PRODUCT IDENTIFICATION NUMBER (PIN)/MACHINE SERIAL NO. PLATE 1- 8
EPA REGULATIONS, ENGINE NUMBER PLATE 1- 8
SERVICE METER POSITION 1- 9
TABLE TO ENTER SERIAL NO. AND DISTRIBUTOR 1- 9
SAFETY 2- 1
SAFETY 2- 2
SAFETY LABELS 2- 4
POSITION FOR ATTACHING SAFETY LABELS 2- 5
SAFETY LABELS 2- 6
GENERAL PRECAUTIONS 2- 11
PRECAUTIONS DURING OPERATION 2- 20
STARTING ENGINE 2- 20
OPERATION 2- 22
TRANSPORTATION 2- 26
BATTERY 2- 27
TOWING 2- 29
PRECAUTIONS FOR MAINTENANCE 2- 30
PRECAUTIONS WITH TIRES 2- 37
OPERATION 3- 1
GENERAL VIEW 3- 2
GENERAL VIEW OF MACHINE 3- 2
GENERAL VIEW OF CONTROLS AND GAUGES 3- 3
EXPLANATION OF COMPONENTS 3- 5
MACHINE MONITOR 3- 5
OTHER FUNCTIONS OF MACHINE MONITOR 3- 26
SWITCHES 3- 30
CONTROL LEVERS AND PEDALS 3- 40
BODY PIVOT PIN 3- 45
ARTICULATE LOCK 3- 45
LOCATION OF FIRE EXTINGUISHER 3- 46
DUST INDICATOR 3- 46
CIRCUIT BREAKER 3- 46
FUSES 3- 47
CAR RADIO 3- 50
CAR STEREO 3- 56
AIR CONDITIONER 3- 64
OPERATION 3- 70
CHECK BEFORE STARTING ENGINE 3- 70
STARTING ENGINE 3- 85
OPERATIONS, CHECKS AFTER STARTING ENGINE 3- 87
STOPPING ENGINE 3- 88
CHECKS AFTER STOPPING ENGINE 3- 88
MOVING MACHINE OFF (FORWARD, REVERSE), STOPPING 3- 89
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FOREWORD
SHIFTING GEAR 3- 94
TRAVELING DOWNHILL 3- 96
STEERING THE MACHINE 3-102
OPERATION USING DIFFERENTIAL LOCK 3-103
LOADING OPERATIONS 3-104
DUMP OPERATIONS 3-105
CAB TILT OPERATION 3-107
PRECAUTIONS FOR OPERATION 3-110
PARKING MACHINE 3-111
CHECKS AFTER COMPLETION OF WORK 3-112
LOCKING 3-112
HANDLING TIRES 3-113
DETERMINING AND MAINTAINING TRAVEL ROAD 3-114
DETERMINING TRAVEL ROAD 3-114
MAINTAINING TRAVEL ROAD 3-114
TRANSPORTATION 3-115
PRECAUTIONS WHEN TRANSPORTING 3-115
STEPS FOR TRANSPORTATION 3-115
METHOD OF SECURING MACHINE 3-116
METHOD OF LIFTING MACHINE 3-117
COLD WEATHER OPERATION 3-121
PRECAUTIONS FOR LOW TEMPERATURE 3-121
PRECAUTIONS AFTER COMPLETION OF WORK 3-122
AFTER COLD WEATHER 3-123
LONG-TERM STORAGE 3-124
BEFORE STORAGE 3-124
DURING STORAGE 3-124
AFTER STORAGE 3-124
PRECAUTIONS BEFORE TRAVELING AFTER LONG-TERM STORAGE 3-124
TROUBLESHOOTING 3-125
AFTER RUNNING OUT OF FUEL 3-125
IF TRANSMISSION HAS TROUBLE 3-126
METHOD OF LOWERING DUMP BODY IN EMERGENCY 3-126
METHOD OF TOWING MACHINE 3-127
IF BATTERY IS DISCHARGED 3-131
OTHER TROUBLE 3-135
MAINTENANCE 4- 1
GUIDES TO MAINTENANCE 4- 2
OUTLINE OF SERVICE 4- 4
HANDLING OIL, FUEL, COOLANT, AND PERFORMING OIL CLINIC 4- 4
OUTLINE OF ELECTRIC SYSTEM 4- 8
WEAR PARTS 4- 9
WEAR PARTS LIST 4- 9
RECOMMENDED FUEL, COOLANT, AND LUBRICANT 4- 10
USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE 4- 11
RECOMMENDED BRANDS, RECOMMENDED QUALITY FOR PRODUCTS OTHER THAN
KOMATSU GENUINE OIL 4- 12
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS 4- 13
TORQUE LIST 4- 13
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS 4- 15
CONTENTS
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CONTENTS
SAFETY CRITICAL PARTS 4- 16
MAINTENANCE SCHEDULE CHART 4- 17
MAINTENANCE SCHEDULE CHART 4- 17
SERVICE PROCEDURE 4- 19
INITIAL 250 HOURS SERVICE (ONLY AFTER THE FIRST 250 HOURS) 4- 19
WHEN REQUIRED 4- 20
CHECK BEFORE STARTING 4- 39
EVERY 50 HOURS SERVICE 4- 40
EVERY 250 HOURS SERVICE 4- 41
EVERY 500 HOURS SERVICE 4- 53
EVERY 1000 HOURS SERVICE 4- 60
EVERY 2000 HOURS SERVICE 4- 71
EVERY 4000 HOURS SERVICE 4- 77
EVERY 6000 HOURS SERVICE 4- 79
EVERY 8000 HOURS SERVICE 4- 80
SPECIFICATIONS 5- 1
SPECIFICATIONS 5- 2
ATTACHMENTS, OPTIONS 6- 1
HANDLING AUTOMATIC RETARDER, ACCELERATOR CONTROL(ARAC) 6- 2
EXPLANATION OF COMPONENTS 6- 2
METHOD OF OPERATION 6- 3
USE OF REAR VIEW MONITOR 6- 4
NAME AND FUNCTON OF EACH PART OF REAR VIEW MONITOR 6- 4
SETTING OF REAR VIEW MONITOR 6- 7
CAUTIONS WHEN USING REAR VIEW MONITOR 6- 7
HANDLING DUMPING COUNTER 6- 8
HANDLING MACHINES EQUIPPED WITH KOMTRAX 6- 9
BASIC PRECAUTIONS 6- 9
INDEX 7- 1
FOREWORD
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SAFETY
SAFETY
SAFETY
SAFETY LABELS 2- 4
POSITION FOR ATTACHING SAFETY LABELS 2- 5
SAFETY LABELS 2- 6
GENERAL PRECAUTIONS 2- 11
SAFETY RULES 2- 11
IF ABNORMALITIES ARE FOUND 2- 11
CLOTHING AND PERSONAL PROTECTIVE ITEMS 2- 11
FIRE EXTINGUISHER AND FIRST AID KIT 2- 11
SAFETY FEATURES 2- 12
KEEP MACHINE CLEAN 2- 12
INSIDE OPERATOR'S COMPARTMENT 2- 12
ALWAYS APPLY LOCK WHEN LEAVING OPERATOR'S SEAT 2- 12
HANDRAILS AND STEPS 2- 13
MOUNTING AND DISMOUNTING 2- 13
CRUSHING OR CUTTING PREVENTION 2- 13
PREVENTION OF BURNS 2- 14
FIRE PREVENTION 2- 15
ACTION IF FIRE OCCURS 2- 15
WINDOW WASHER LIQUID 2- 16
PRECAUTIONS WHEN USING ROPS (Roll Over Protective Structure) 2- 16
PRECAUTIONS FOR ATTACHMENTS, OPTIONS 2- 16
UNAUTHORIZED MODIFICATION 2- 16
SAFETY AT WORKSITE 2- 16
WORKING ON LOOSE GROUND 2- 17
DO NOT GO CLOSE TO HIGH-VOLTAGE CABLES 2- 17
ENSURE GOOD VISIBILITY 2- 18
PRECAUTIONS RELATED TO VENTILATION OF EXHAUST GAS 2- 18
CHECKING SIGNALMAN'S SIGNALS AND SIGNS 2- 18
EMERGENCY ESCAPE FROM OPERATOR'S CAB 2- 18
ASBESTOS DUST HAZARD PREVENTION 2- 19
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SAFETY
PRECAUTIONS DURING OPERATION 2- 20
STARTING ENGINE 2- 20
CHECKS BEFORE STARTING ENGINE, ADJUST 2- 20
PRECAUTIONS WHEN STARTING 2- 20
PRECAUTIONS IN COLD AREAS 2- 21
OPERATION 2- 22
CHECKS BEFORE STARTING OPERATION 2- 22
PRECAUTIONS WHEN TRAVELING IN FORWARD OR REVERSE 2- 22
PRECAUTIONS WHEN TRAVELING 2- 23
PRECAUTIONS WHEN TRAVELING ON SLOPES 2- 23
PRECAUTIONS WHEN OPERATING DUMP BODY 2- 24
PRECAUTIONS WHEN OPERATING 2- 24
PRECAUTIONS FOR ACCUMULATED SNOW, ICE 2- 24
PARKING MACHINE 2- 25
TRANSPORTATION 2- 26
LOADING AND UNLOADING 2- 26
SHIPPING 2- 26
BATTERY 2- 27
BATTERY HAZARD PREVENTION 2- 27
STARTING WITH BOOSTER CABLES 2- 28
TOWING 2- 29
WHEN TOWING 2- 29
SAFETY
PRECAUTIONS FOR MAINTENANCE 2- 30
WARNING TAG 2- 30
KEEP WORK PLACE CLEAN AND TIDY 2- 30
APPOINT LEADER WHEN WORKING WITH OTHERS 2- 30
STOP ENGINE BEFORE CARRYING OUT INSPECTION AND MAINTENANCE 2- 31
TWO WORKERS FOR MAINTENANCE WHEN ENGINE IS RUNNING 2- 32
PROPER TOOLS 2- 33
HANDLING SUSPENSION CYLINDER, ACCUMULATOR 2- 33
PERSONNEL 2- 33
WORK UNDER THE MACHINE 2- 33
NOISE 2- 33
PRECAUTIONS WHEN USING HAMMER 2- 34
REPAIR WELDING 2- 34
REMOVING BATTERY TERMINAL 2- 34
PRECAUTIONS WITH HIGH-PRESSURE OIL 2- 34
PRECAUTIONS FOR HIGH-PRESSURE FUEL 2- 34
HANDLING HIGH-PRESSURE HOSES, PIPING 2- 35
PRECAUTIONS FOR HIGH VOLTAGE 2- 35
WASTE MATERIALS 2- 35
MAINTENANCE OF AIR CONDITIONER 2- 35
COMPRESSED AIR 2- 35
PERIODIC REPLACEMENT OF SAFETY-CRITICAL PARTS 2- 36
PRECAUTIONS WITH TIRES 2- 37
HANDLING TIRES 2- 37
PRECAUTIONS WHEN STORING TIRE 2- 37
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SAFETY LABELS
SAFETY
SAFETY LABELS
The following warning signs and safety labels are used on this machine.
Be sure that you fully understand the correct position and content of labels.
To ensure that the content of labels can be read properly, be sure that they are in the correct place and always
keep them clean. When cleaning them, do not use organic solvents or gasoline. These may cause the labels to
peel off.
There are also other labels in addition to the warning signs and safety labels. Handle those labels in the same
way.
If the labels are damaged, lost, or cannot be read properly, replace them with new ones. For details of the part
numbers for the labels, see this manual or the actual label, and place an order with Komatsu distributor.
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SAFETY
POSITION FOR ATTACHING SAFETY LABELS
SAFETY LABELS
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SAFETY LABELS
SAFETY LABELS
(1) Caution for modification of ROPS/FOPS (09620-A2000)
(2) Caution for checking engine room (09667-A0880)
SAFETY
(3) Caution when releasing radiator cap (09653-A0641)
(4) Caution when releasing hydraulic tank cap (09653-A0641)
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SAFETY
SAFETY
(5) Caution when handling suspension (09659-A0641)
SAFETY LABELS
SAFETY LABELS
(6) Caution for handling accumulator (09659-A057B)
(7) Warnings for electric wire
Warnings for crush hazard when inspection and maintenance
(56B-93-12980)
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SAFETY LABELS
(8) Cautions before starting
Cautions when traveling in reverse
(569-93-61720)
SAFETY
(9) Caution when handling battery cable (09808-A1681)
(10) Exhaust pipe is hot! (09817-A1103)
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SAFETY
SAFETY
(11) Prohibited to enter (09162-C0881)
SAFETY LABELS
SAFETY LABELS
(12) Cation for articulate lock (09161-C0881)
(13)Precautions when handling battery
(The battery manufacturer sticks this caution plate on the
battery. )
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SAFETY
SAFETY LABELS
SAFETY LABELS
(14) Caution for parking brake
(This plate is fixed in position by the chamber maker)
(15) Prohibited to jump start (09842-A0481)
(This plate is fixed to the starting motor)
SAFETY
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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 in this manual when operating or performing maintenance on
the machine.
If you are not feeling well, or if you are under the influence of alcohol or medication, your ability to safely operate
or repair your machine may be severely impaired, putting yourself and everyone else on your job site in danger.
When working with another operator or with the person on the worksite traffic duty, discuss the content of the
operation beforehand and use the determined signals when carrying out the operation.
IF PROBLEMS ARE FOUND
If you find any problems in the machine during operation or maintenance (noise, vibration, smell, incorrect gauges,
smoke, oil leakage, etc., or any abnormal display on the warning devices or monitor), report to the person in charge
and have the necessary action taken. Do not operate the machine until the problem has been corrected.
CLOTHING AND PERSONAL PROTECTIVE ITEMS
Do not wear loose clothing and accessories. There is a hazard that they may catch on dump lever 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 in the storage point. Carry out periodic
checks and add to the contents if necessary.
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GENERAL PRECAUTIONS
SAFETY FEATURES
Be sure that all guards, covers and mirrors are in their proper position. Have guards and covers repaired
immediately if they are damaged.
Understand the method of use of safety features and use them properly.
Never remove any safety features. Always keep them in good operating condition.
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.
SAFETY
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 adjusting or standing up from the operator's seat, always set shift lever (1) to the N position and parking
brake switch (2) to the PARKING position, then stop the engine.
If the gear shift lever or dump lever are touched by mistake, there is danger that the machinemay suddenly move
and cause serious personal injury or damage.
When leaving the machine, always place shift lever(1) at neutral
and set parking brake switch (2) to the PARKING position.
Lower the dump body, set the dump lever to the HOLD position,
and lock with the dump lever lock knob. Apply all the locks and
always remember to take the key with you and keep it in the
fixed place.
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SAFETY
HANDRAILS AND STEPS
To prevent personal injury caused by slipping or falling off the machine, always do as follows.
Use the parts marked by arrows in the diagram when getting on
or off the machine.
A: For getting on or off machine using left door
B: For getting on or off machine using right door
GENERAL PRECAUTIONS
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 to ensure that you support
yourself.
Do not grip the dump lever when getting on or off the machine.
Never climb on the engine hood or covers where there are no
non-slip pads.
Before getting on or off the machine, check the handrails and
steps, and if there is any oil, grease, or mud on them, wipe it off
immediately. In addition, 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.
CRUSHING OR CUTTING PREVENTION
If the clearance at the articulating portion changes, it will lead to serious personal injury.
Do not allow anyone to come inside the articulation range.
The clearance in the area around the dump body changes according to the movement of the dump body. If you
are caught, you will suffer serious injury. Do not allow anyone near any of the rotating or telescoping parts.
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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 a 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
2 - 14
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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-flammableoil. 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.
GENERAL PRECAUTIONS
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.
Fire coming from electric wiring
Short circuits in the electrical system can cause fire.
Always keep electric wiring connections clean and securely tightened.
Check the wiring every day for looseness or damage. Tighten any loose connectors or wiring clamps. Repair
or replace any damaged wiring.
Fire coming from hydraulic line
Check that all the hose and tube clamps, guards, and cushions are securely fixed in position.
If they are loose, they may vibrate during operation and rub against other parts. This may lead to damage to the
hoses, and cause high-pressure oil to spurt out, leading to fire damage or serious injury.
Explosion caused by lighting equipment
When checking fuel, oil, battery electrolyte, window washer fluid, or coolant, always use lighting with
anti-explosion specifications. If such lighting equipment is not used, there is danger of explosion that may
cause serious injury.
When taking the electrical power for the lighting from the machine itself, follow the instructions in this manual.
ACTION IF FIRE OCCURS
If a fire occurs, escape from the machine as follows.
Turn the start switch OFF to stop the engine.
Use the handrails and steps to get off the machine.
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GENERAL PRECAUTIONS
WINDOW WASHER LIQUID
Use an ethyl alcohol base washer liquid.
Methyl alcohol base washer liquid may irritate your eyes, so do not use it.
PRECAUTIONS WHEN USING ROPS (Roll Over Protective Structure)
The operator's cab has a ROPS structure. In addition to supporting
of the load if the machine tips over, it also absorbs the impact
energy and protects the operator. If the function of ROPS is
reduced, it cannot protect the operator and he may be injured.
Always do the following.
Do not weld, drill holes, or make any other modification to the
operator's cab structure.
Repair or replace the operator's cab if it is deformed by falling
objects or when the machine tips over. For details of repair,
please consult your Komatsu distributor.
Even when the ROPS isinstalled, ifyou donot fastenyour seatbelt
securely, it cannot protect you properly. Always fasten your seat
belt when operating the machine.
SAFETY
PRECAUTIONS FOR ATTACHMENTS, OPTIONS
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, product failures or other property damages resulting from the use of unauthorized
attachments or parts will not be the responsibility of Komatsu.
Always read the instruction manual for the attachment.
UNAUTHORIZED MODIFICATION
If this machine is modified without permission from Komatsu, there is danger that problems may occur with safety
and that this may lead to serious personal injury. Modifications may have an adverse effect on items such as
machine strength and visibility. Before making any modifications, please consult your Komatsu distributor.
Komatsu cannot take any responsibility for accidents, failures, or damage caused by modifications not authorized
by Komatsu.
SAFETY AT WORKSITE
Before starting operations, thoroughly check the area for any unusual conditions that could be dangerous.
Check the terrain and condition of the ground at the worksite, and determine the safest method of operation. Do
not operate where there is a hazard of landslides or falling rocks.
Take necessary measures to prevent any unauthorized person from entering the operating area.
When traveling or operating in shallow water or onsoft ground,check the shape and condition of the bedrock, and
the depth and speed of flow of the water before starting operations.
Always design and maintain the roads on the jobsite so that the machines can travel safely.
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SAFETY
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 personal
injury or death. 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.
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 rubber sheet 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 near 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 near the machine.
Voltage of Cables Safety Distance
100 V - 200 V Over 2 m (7 ft)
6,600 V Over 2 m (7 ft)
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)
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