PDF Operation & Maintenance Manual Komatsu WA470-6 Wheel Loader - 2 MB
This is the official Operation and Maintenance Manual for the Komatsu WA470-6 wheel loader.
This comprehensive guide provides operators with crucial information on safety, controls, and correct operating techniques.
It also outlines the full preventative maintenance schedule required to keep the machine reliable and productive.
This manual is a must-read for anyone operating or servicing this wheel loader.
PDF Viewer
Viewer loads when you scroll here
SHARE THIS MANUAL
Download the PDF Manual
PDF viewer loading area
Text Preview from This Manual
The text below was extracted from the visible preview pages to help you confirm the manual contents before download.
--- Page 1 ---
TEN00451-00
WHEEL LOADER WA470 -6
SERIAL NUMBERS 90234 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.
NOTICE
Komatsu has Operation & Maintenance Manuals
written in some other languages. If a foreign language
manual is necessary, contact your local distributor for
availability.
--- Page 3 ---
.
CONTENTS FOREWORD
WEAR PARTS LIST 4- 8
RECOMMENDED FUEL, COOLANT, AND LUBRICANT 4- 9
USE OF FUEL, COOLANT AND LUBRICANTS ACCORDING TO AMBIENT TEMPERATURE 4- 10
RECOMMENDED BRANDS, RECOMMENDED QUALITY FOR PRODUCTS OTHER THAN
KOMATSU GENUINE OIL 4- 11
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS 4- 12
TORQUE LIST 4- 12
PERIODIC REPLACEMENT OF SAFETY CRITICAL PARTS 4- 13
MAINTENANCE SCHEDULE CHART 4- 15
MAINTENANCE SCHEDULE CHART 4- 15
SERVICE PROCEDURE 4- 17
INITIAL 250 HOURS SERVICE 4- 17
INITIAL 1000 HOURS SERVICE 4- 17
WHEN REQUIRED 4- 18
CHECK BEFORE STARTING 4- 42
EVERY 50 HOURS SERVICE 4- 43
EVERY 100 HOURS SERVICE 4- 44
EVERY 250 HOURS SERVICE 4- 46
EVERY 500 HOURS SERVICE 4- 54
EVERY 1000 HOURS SERVICE 4- 57
EVERY 2000 HOURS SERVICE 4- 62
EVERY 4000 HOURS SERVICE 4- 68
EVERY 8000 HOURS SERVICE 4- 72
SPECIFICATIONS 5- 1
SPECIFICATIONS 5- 2
ATTACHMENTS, OPTIONS 6- 1
SELECTING BUCKET AND TIRES 6- 2
HANDLING TORQUE CONVERTER LOCK-UP 6- 3
GENERAL LOCATIONS 6- 3
METHOD OF OPERATION 6- 4
WARNING/LIMIT FUNCTIONS FOR TRAVEL SPEED 6- 5
HANDLING JOYSTICK STEERING SYSTEM 6- 6
EXPLANATION OF COMPONENTS 6- 6
STRUCTURE AND FUNCTION OF JOYSTICK STEERING 6- 10
GETTING IN OR OUT OF OPERATOR'S CAB 6- 11
SEAT ADJUSTMENT 6- 12
ADJUSTMENT OF JOYSTICK CONSOLE 6- 14
OPERATION USING JOYSTICK LEVER AND OPERATION USING STEERING WHEEL 6- 15
PRECAUTIONS FOR STEERING WITH JOYSTICK 6- 16
OPERATION METHOD OF JOYSTICK STEERING SYSTEM 6- 16
HANDLING MULTI FUNCTION MONO-LEVER 6- 19
EXPLANATION OF COMPONENTS 6- 19
USING FNR SWITCH TO CHANGE BETWEEN FORWARD AND REVERSE 6- 24
HANDLING LOAD METER 6- 26
OUTLINE OF LOAD METER 6- 26
PRINCIPLE OF LOAD METER MEASUREMENT 6- 28
POINTS TO REMEMBER TO ENSURE HIGH ACCURACY 6- 30
USING LOAD METER 6- 32
CENTRAL LUBRICATION SYSTEM 6- 63
OPERATING THE CENTRAL LUBRICATION SYSTEM 6- 63
1 - 10
--- Page 4 ---
.
SAFETY LABELS SAFETY
(7) Caution when canceling parking brake emergency
(423-93-41311)
(8) Warning for hot cooling water (09668-03001)
(9) Caution when oil is at high temperature (09653-03001)
(10) Caution when handling battery cable (09808-03000)
2-8
--- Page 5 ---
.
GENERAL PRECAUTIONS COMMON TO OPERATION AND MAINTENANCE SAFETY
PRECAUTIONS WHEN LEAVING MACHINE
If the proper procedures are not taken when parking the machine,
the machine may suddenly move off by itself, and this may lead to
serious personal injury or death. Always do the following.
When leaving the machine, always lower the work equipment
completely to the ground, set work equipment lock lever (1) to
the lock position (L), set parking brake switch (2) to the ON
position (A), and stop the engine.
In addition, lock all parts, always take the key with you, and
leave it in the specified place.
EMERGENCY EXIT FROM OPERATOR'S CAB
On machines fitted with a cab, a door is installed on the left side and an emergency escape door is installed on the
right side. If the door on the left side does not open, escape from the emergency door on the right side.
PRECAUTIONS WHEN CLEANING CAB GLASS
Always keep the cab glass clean to ensure good visibility when operating.
When cleaning the front glass, pay careful attention to the safety of your footing on the platform on the left or right
of the operator's cab or on the step on the front fender so as not to fall off the machine.
For cab glass cleaning procedures, see "WALK-AROUND CHECK (PAGE 3-99)" in this manual.
2 - 18
--- Page 6 ---
.
PRECAUTIONS FOR OPERATION SAFETY
TRAVELING ON SLOPES
To prevent the machine from tipping over or slipping to the side, always do as follows.
Keep the work equipment at height (A) 20 - 30 cm (8 - 12 in)
above the ground) so that it can be lowered immediately to the
ground to stop the machine in case of emergency.
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.
If the engine stops, depress the brake pedal immediately, lower the bucket to the ground, and apply the parking
brake to stop the machine.
When traveling downhill, never shift gear or place the transmission at neutral. It is dangerous not to use the
braking force of the engine. Always place the transmission in a low gear before starting to travel downhill.
When traveling downhill, travel slowly. If necessary, use the braking force of the engine together with the brake
pedal to control the travel speed.
When traveling up or down hills with a loaded bucket, always travel with the bucket facing uphill. If the machine
travels with the bucket facing downhill, there is danger that the machine may tip over.
METHOD OF 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.
When traveling downhill, use the braking force of the engine, and always use the right brake pedal at the same
time.
Set to the lock-up and use the braking force of the engine.
2 - 28
--- Page 7 ---
.
PRECAUTIONS FOR MAINTENANCE SAFETY
PRECAUTIONS FOR INSPECTION AND MAINTENANCE
PRECAUTIONS WHEN 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.
HANDLING BATTERY
Before inspecting or handling the battery, turn the key in the starting switch to the OFF position.
When installing the optional battery disconnector switch, turn the battery disconnector switch to the OFF position.
For details, see "HANDLING BATTERY DISCONNECTOR SWITCH (PAGE 6-67)".
Danger of battery exploding
When the battery is being charged, flammable hydrogen gas is
generated and may explode. In addition, the battery electrolyte
includes dilute sulphuric acid. Any mistake in handling may
cause serious personal injury, explosion, or fire, so always
observe the following.
Do not use or charge the battery if the battery electrolyte is
below the LOWER LEVEL mark. This will cause explosion.
Always carry out periodic inspection of the battery electrolyte
level, and add distilled water (or commercially available
battery filler solution) to the UPPER LEVEL mark.
Do not smoke or bring any flame close to the battery.
Hydrogen gas is generated when the battery is being
charged, so remove the battery from the machine, take it to
a well-ventilated place, remove the battery caps, then carry
out the charging.
After charging, tighten the battery caps securely.
Danger from dilute sulphuric acid
When the battery is being charged, flammable hydrogen gas is
generated and may explode. In addition, the battery electrolyte
includes dilute sulphuric acid. Any mistake in handling may
cause serious personal injury, explosion, or fire, so always
observe the following.
When handling the battery, always wear protective goggles
and rubber gloves.
If battery electrolyte gets into your eyes, immediately wash
your eyes with large amounts of fresh water. After that, get
medical attention immediately.
If battery electrolyte gets on your clothes or skin, wash it off
immediately with large amounts of water.
Removing battery cables
Before repairing the electrical system or carrying out electrical welding, turn the starting switch OFF. Wait for
approx. 1 minute, then remove the negative (-) battery cable to stop the flow of electricity.
For machines equipped with a battery disconnector switch, set the battery disconnector switch to the OFF
position.
For details, see "HANDLING BATTERY DISCONNECTOR SWITCH (PAGE 6-67)".
2 - 38
--- Page 8 ---
.
GENERAL VIEW OPERATION
MACHINE MONITOR
(1) Central warninng lamp (21) Auto-greasing pilot lamp (if equipped)
(2) Brake oil pressure caution lamp (22) Joystick pilot lamp (if equipped)
(3) Enigine oil pressure caution lamp (23) Directional selector pilot lamp (if equipped)
(4) Water separtor caution lamp (24) Shift indicator
(5) Radiator coolant level caution lamp (25) Auto-shift pilot lamp
(6) Engnine oil level caution lamp (26) Torque converter lockup pilot lamp (if equipped)
(7) Transmission oil filter clogging caution lamp (27) Shift hold pilot lamp
(8) Air cleaner clogging caution lamp (28) Shift lever position pilot lamp
(Machines equipped with KOMTRAX) (29) Torque converter oil temperature gauge
(9) Parking brake pilot lamp (30) Torque converter oil temperature caution lamp
(10) Brake oil temperature caution lamp (31) Engine coolant temperature gauge
(11) Cooling fan reverse rotaion pilot lamp (32) Engine coolant temperature caution lamp
(12) Maintenance caution lamp (33) Speedometer
(13) Battery electrolyte level caution lamp (34) Turn signal pilot lamp
(14) Battery charge circuit caution lamp (35) Head lamp high beam pilot lamp
(15) Steering oil pressure caution lamp (if equipped) (36) Meter display pilot lamp
(16) Emergency steering pilot lamp (if equipped) (37) Hydraulic oil temperature caution lamp
(17) Character display portion (38) Hydraulic temperature gauge
(18) Power mode pilot lamp (P mode) (39) Fuel level caution lamp
(19) Preheating pilot lamp (40) Fuel gauge
(20) Semi auto digging pilot lamp (if equipped) (41) Economy operation display lamp
3-4
--- Page 9 ---
.
EXPLANATION OF COMPONENTS OPERATION
EMERGENCY STOP ITEMS
CAUTION
If these lamps light up and the buzzer sounds, stop operations immediately and carry out inspection and maintenance of the
applicable location.
If any abnormality is found in the emergency stop items, the alarm buzzer will sound intermittently, and the lamp for
the location of the abnormality and the central warning lamp will light up.
At the same time, the top line of the character display displays "E03" and the bottom line displays "CHECK RIGHT
NOW" and "CALL" alternately for 3 seconds each, so stop the machine immediately in a safe place, stop the engine,
and carry out inspection.
(1) Brake oil pressure caution lamp (4) Steering oil pressure caution lamp
(2) Engine oil pressure caution lamp (if equipped)
(3) Battery charge circuit caution lamp
3 - 14
--- Page 10 ---
.
EXPLANATION OF COMPONENTS OPERATION
COOLING FAN REVERSE ROTATION PILOT LAMP
This lamp (2) lights up when the direction of rotation of the cooling
fan is reversed.
At the same time, "COOLING FAN REVERSE" is displayed on the
character display.
For details of the method of operation, see "COOLING FAN
REVERSE ROTATION SWITCH (PAGE 3-50)".
EMERGENCY STEERING PILOT LAMP
(If equipped)
(Green)
This lamp (3) lights up when the emergency steering is being
actuated.
If the engine stops when the machine is traveling or an abnormality
occurs in the steering oil pressure circuit, and the machine is
traveling at a speed of more than 2 km/h (1.2 MPH), the emergency
steering is automatically actuated and the lamp lights up.
If the lamp lights up, move the machine immediately to a safe
place, stop the engine, and check the condition.
In addition, the lamp flashes if the emergency steering is actuated continuously for one minute.
At the same time, "E02 EMR S/T OVERRUN" is displayed on the character display, so move the machine
immediately to a safe place, stop the engine, and check the condition.
There is an emergency steering self-check function. For details, see "EMERGENCY STEERING SELF-CHECK
FUNCTION (PAGE 3-137)" in the OPERATION section.
POWER MODE PILOT LAMP (P MODE)
This lamp (4) lights up when the P mode is selected.
Use the power mode selector switch to select the P mode.
3 - 24
--- Page 11 ---
.
EXPLANATION OF COMPONENTS OPERATION
INPUT METHOD FOR TELEPHONE NUMBER
It is possible to display the telephone number on the right side of "CALL" displayed on the character display when
action code "E03" is generated.
1. Press the ( ) of machine monitor mode selector switch 1, and display the odometer.
2. Press (>) or (<) of machine monitor mode selector switch 2 and
display "TEL".
3. Press ( ) of machine monitor mode selector switch 1. It will
change to the display in the diagram on the right.
Once the telephone number is input, the input number will be
displayed next time.
4. Up to 12 digits can be displayed for the telephone number.
Input from the first digits.
The cursor is displayed at the input position. Press (>) or (<) of
machine monitor mode selector switch 2 and display "0 to 9".
To leave a blank, select "*".
When the input value is decided, press ( ) of machine monitor
mode selector switch 1. The cursor will move to the next
position.
5. Repeat the procedure in Step 4 until the last digit. At the last digit, press ( ) of machine monitor mode selector
switch 1 to return to the previous screen.
If there is a mistake in the input or the input is to be stopped, press () of machine monitor mode selector switch
1 to return to the previous screen.
6. When completing the operation, press () of machine monitor mode selector switch 1 twice or turn the starting
switch OFF.
3 - 34
--- Page 12 ---
.
EXPLANATION OF COMPONENTS OPERATION
HAZARD LAMP SWITCH
WARNING
Use the hazard lamp only in emergencies. Using the hazard lamp when traveling may cause confusion for other machine
operators.
This switch (8) is used in emergencies, such as when the machine
breaks down and has to be parked on the road.
Position (A): Turn signal lamps, turn signal pilot lamp flash, and
pilot lamp (C) lights up at same time.
Position (B): Lamps are OFF.
PARKING BRAKE SWITCH
WARNING
Always apply the parking brake when leaving the machine or when parking it.
Even if the parking brake switch is turned ON, there is danger until the parking brake pilot lamp lights up, so keep the brake pedal
depressed.
NOTICE
Do not use the parking brake switch to apply the brake when traveling except in emergencies. The parking brake may be
damaged, resulting in a serious accident. Stop the machine first, then apply the parking brake.
If the parking brake has to be used as an emergency brake when the machine is traveling at high speed, ask your Komatsu
distributor to carry out inspection to check that there is no damage to the parking brake.
This switch (9) operates the parking brake.
Position (A): ON
The parking brake is applied, and the parking brake
pilot lamp lights up.
Position (B): OFF
The parking brake is released.
REMARK
When the parking brake is applied, the machine will not move off even if the directional lever is operated.
If the directional lever is placed at the F or R position with the parking brake still applied, the central warning lamp
will light up and the buzzer will sound.
Before starting the engine, turn the parking brake switch ON.
3 - 44
--- Page 13 ---
.
EXPLANATION OF COMPONENTS OPERATION
CONTROL LEVERS, PEDALS
(1) Gearshift lever (5) Bucket control lever
(2) Directional lever (6) Lift arm control lever
(3) Gearshift lever stopper (7) Brake pedal
(4) Work equipment lock lever (8) Accelerator pedal
GEARSHIFT LEVER
This lever (1) changes the speed range of the transmission.
MANUAL SHIFT
This machine has a 4-FORWARD, 4-REVERSE speed
transmission.
Place the gearshift lever in a suitable position to obtain the desired
speed range.
1st and 2nd speeds are used for working.
3rd and 4th speeds are used for traveling.
However, when the gearshift lever stopper is being used, it is
impossible to shift to 3rd or 4th. Disengage the gearshift lever
stopper before trying to shift gear.
Position (a): 1st
Position (b): 2nd
Position (c): 3rd
Position (d): 4th
3 - 54
--- Page 14 ---
.
EXPLANATION OF COMPONENTS OPERATION
OPEN LOCK KNOB FOR CAB EMERGENCY ESCAPE DOOR
CAUTION
The door on the right side of the cab is provided as an emergency escape door for use when it is impossible to exit from the
door on the left side. Do not use it as the door for normal entry and exit from the cab.
Never operate the machine with the door open to around 90 degrees. The door may extend beyond the maximum width of the
machine or it may suddenly close if the brakes are applied. This is extremely dangerous, so never operate the machine in this
condition.
Operate the machine with the door on the right side fully closed (lock) or partially opened (quarter lock).
Use this to fix the door on the right side at the open or closed position.
1. When open lock knob (1) is pushed down securely, the lock is
applied.
When using the air conditioner or heater, carry out operations
with the knob in this position.
2. If open lock knob (1) is lifted up, the door on the right will
partially open (quarter lock).
When taking in outside air on the right side, carry out
operations with the window in this position.
METHOD OF RELEASING A LOCK IN AN EMERGENCY
If the door on the left side of the cab will not open, or it is dangerous to get on or off the machine from the door on
the left side, release the open lock of the door on the right, open the door fully, then use it to leave the operator's cab.
1. Lift open lock knob (1) up.
3 - 64
--- Page 15 ---
.
EXPLANATION OF COMPONENTS OPERATION
METAL TAPE BUTTON
(used also for preset button No. 5)
This button (11) is used when playing a metal or chrome tape. This
button is also used for preset button No. 5. When it is pressed,
"MTL" appears on the display.
MANUAL TUNING BUTTONS
These buttons (12) are used for manual tuning.
When "TUN ∧" button is pressed, the frequency goes up; when
"TUN ∨" button is pressed, the frequency goes down. If the button
is pressed down and held, the frequency will change continuously.
SEEK TUNING BUTTONS
These buttons (13) are used to seek tuning.
When the "SEEK UP" button is pressed, the search automatically
goes up; when the "SEEK DN" button is pressed, the search
automatically goes down.
When the next station that can be received is found, it
automatically stops.
BAND SELECTOR BUTTON
When this button (14) is pressed, the band is switched between
FM1, FM2, and MW (AM). The band is shown on the display.
3 - 74
--- Page 16 ---
.
EXPLANATION OF COMPONENTS OPERATION
AIR CONDITIONER
(If equipped)
By taking fresh air into the cab through a filter, it is possible to raise the pressure inside the cab. This makes it
possible to provide a pleasant working environment even on dusty jobsites.
GENERAL LOCATIONS AND FUNCTION OF CONTROL PANEL
(1) Main power switch (4) Temperature control switch
(2) Fan switch (5) FRESH/RECIRC selector switch
(3) Air conditioner switch (6) Display monitor
3 - 84
--- Page 17 ---
.
EXPLANATION OF COMPONENTS OPERATION
AIR CONDITIONER SWITCH
Use this switch (3) to start and stop the cooling or dehumidifying
heating function.
When the main power switch is ON, if the air conditioner switch is
pressed, the air conditioner is turned ON and (A) is displayed on
the display monitor.
If the switch is pressed again, the switch is turned OFF and display
monitor (A) goes out.
AUTO SWITCH
Use this switch (4) for automatic operation of the air conditioner
(actuation of the cooling and dehumidifying/heating functions,
stopping operation).
When the main power switch is turned ON and the AUTO air
conditioner switch is pressed, the air conditioner is turned ON and
the display monitor shows "AUTO".
If the switch is pressed again, the air conditioner is turned OFF and
the "AUTO" sign on the display monitor goes out.
TEMPERATURE CONTROL SWITCH
Use this switch (5) to adjust the temperature between low
temperature and high temperature.
When switch (A) is pressed, the temperature of the air blowing out
becomes higher; when switch (B) is pressed, the temperature of
the air blowing out becomes lower.
The set temperature is displayed on the display monitor.
3 - 94
--- Page 18 ---
.
OPERATION OPERATION
CHECK COOLANT LEVEL, ADD COOLANT
WARNING
Do not open the radiator cap unless necessary. When checking the coolant, always wait for the engine to cool down and check
the sub-tank.
Immediately after the engine is stopped, the coolant is at a high temperature and the radiator is under high internal pressure.
If the cap is removed to check the coolant level in this condition, there is a hazard of burns. Wait for the temperature to go
down, then turn the cap slowly to release the pressure and remove it carefully.
CAUTION
When adding coolant, use the step and handrail provided. Support your body securely.
1. Open cover (1) of the platform on the right side of the machine.
2. Check that the coolant level is between the FULL and LOW
marks on radiator sub-tank (2). If the coolant level is low, add
coolant through the coolant filler of sub-tank (2) to the FULL
level.
3. After adding coolant, tighten the cap securely.
4. If the sub-tank becomes empty, there is probably coolant
leakage. After checking, repair any abnormality immediately. If
no abnormality is found, check the level of the water in the
radiator. If it is low, add COOLANT of the same density in
radiator according to the COOLANT density table in "CLEAN
INSIDE OF COOLING SYSTEM (PAGE 4-21)", then add
COOLANT to the sub-tank.
If the volume of coolant added is more than usual, check for
possible leakage.
Confirm that there is no oil in the coolant.
3 - 104
--- Page 19 ---
.
OPERATION OPERATION
To make belt longer: Set the fixed end of the tether belt at 90
degrees to the holder, and pull.
ADJUST LEVER STAND
WARNING
When adjusting the lever stand, check that the work equipment lock lever is securely at the LOCK position.
If it is not at the LOCK position, and the work equipment control levers are touched by accident when adjusting the lever stand,
the work equipment may suddenly move and cause serious personal injury.
ADJUST HEIGHT AND ANGLE OF ARMREST
The height and angle of armrest (1) can be adjusted by loosen lock
lever (2).
Height adjustment amount: 30 mm
Angle adjustment amount: 44 degrees
REMARK
Set lock lever (2) to the FREE position (F). The lock lever is
loosened.
Hold the armrest at the desired position and move the lock lever to
the LOCK position (L) to secure the armrest in position.
ADJUST LEVER STAND FORWARD AND BACKWARD
Pull lever (3) up with your left hand, grip armrest (1) with your
right-hand and move it to the front or rear, then release lever (3).
Amount of adjustment: 180 mm
3 - 114
--- Page 20 ---
.
OPERATION OPERATION
To warm up the hydraulic oil in cold areas, do as follows.
2. After carrying out the warming-up operation, check that the
engine rotation is smooth, then set the work equipment lock
lever to the FREE position (F).
3. Operate the bucket control lever to the TILT position (A) and
return it to the HOLD position (B) repeatedly to warm up the
hydraulic oil.
Relieve the circuit at the TILT position (A) for a maximum of 10
sec.
This brings the oil to the relief pressure and makes it quicker
warm up the oil.
4. Slowly operate the steering wheel to the left and the right about 10 times to warm up the hydraulic oil inside the
steering valve.
WARNING
If the steering wheel is operated and stopped while the oil temperature is
low, there may be a time lag before the machine stops turning.
In this case, use the frame lock bar to ensure safety, and perform the
warm-up operation in a wide place.
Do not relieve the hydraulic oil in the circuit continuously for more than 5
seconds.
NOTICE
Turn the steering wheel a little and stop in that position. Confirm that the machine turns by an angle equivalent to the amount that
the steering wheel is turned.
5. After carrying out the warming-up operation, check that the
gauges and caution lamps are normal.
If there is any abnormality, carry out maintenance or repair.
Run the engine under a light load until engine water
temperature gauge (2) and torque converter oil temperature
gauge (3) are in the green range.
6. Check for abnormal exhaust gas color, noise, or vibration. If
any problem is found, contact your Komatsu distributor.
REMARK
The rotating speed of the cooling fan differs according to the following conditions, but this does not indicate any
abnormality.
The cooling fan speed increases when the hydraulic oil temperature, engine coolant temperature, or transmission
oil temperature are high.
However, when the cooling fan is rotating in reverse, it rotates at a fixed speed proportional to the engine speed,
regardless of any oil or coolant temperature.
3 - 124
--- Page 21 ---
.
OPERATION OPERATION
ADJUSTING TRANSMISSION CUT-OFF POSITION
CAUTION
Apply the parking brake before adjusting the transmission cut-off position.
Adjust the amount that the brake pedal is depressed.
1. Start the engine with starting switch (1), then set parking brake
switch (2) to the ON position.
2. Set transmission cut-off switch (3) to the ON position.
3. Depress brake pedal (4) and adjust the set position to return
the transmission to Neutral.
4. Press transmission cut-off set switch (5), then release it. When
the switch is released, the buzzer will sound with a repeated
short sound, and the cut-off position is set.
Method of canceling cut-off position
5. After the buzzer sounds in Step 4 of the adjustment procedure,
the transmission cut-off switch flashes for 2 seconds. While it
is flashing, press transmission cut-off set switch (5) again and
release it.
6. The buzzer will sound with a long sound and the adjusted
cut-off position is canceled.
STOPPING WHEN TRANSMISSION CUT-OFF IS ON
When the transmission cut-off switch is ON, if the brake pedal is depressed, the transmission is returned to Neutral
when the brake pedal is depressed to the set position.
REMARK
When the transmission cut-off switch is OFF, the transmission is not returned to Neutral.
3 - 134
--- Page 23 ---
.
OPERATION OPERATION
LOADING OPERATIONS
Select the method of operation which will give the minimum amount of turning and travel in order to provide the most
efficient method for the jobsite.
WARNING
Always keep the jobsite flat, and do not operate the steering wheel suddenly or apply the brakes suddenly when the lift arm is
raised with a loaded bucket. This is dangerous.