.
OPERATION
TROUBLESHOOTING
ENGINE
( ): Always contact your Komatsu distributor when dealing with these items.
In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem Main causes Remedy
Engine oil pressure monitor flashes
when engine speed is raised after
completion of warm-up
Engine oil pan oil level is low
(sucking in air)
Clogged oil filter cartridge
Defective tightening of oil pipe
joint, oil leakage from damaged
part
Defective monitor panel
Add oil to specified level, see
CHECK BEFORE STARTING
Replace cartridge, see EVERY
500 HOURS SERVICE
(
Check, repair)
(
Replace)
Steam is emitted from top part of
radiator (pressure valve)
Coolant level low, water leakage
Dirt or scale accumulated in
cooling system
Clogged radiator fins or
damaged fins
Defective thermostat
Loose radiator filler cap (high
altitude operation)
Defective monitor panel
Add coolant, repair, see
CHECK BEFORE STARTING
Change coolant, clean
inside of cooling system, see
WHEN REQUIRED
Clean or repair, see WHEN
REQUIRED
(
Replace thermostat)
Tighten cap or replace packing
(
Replace)
Engine water temperature monitor
remains alight altitude operation)
Engine does not start when starting
motor is turned
Lack of fuel
Air in fuel system
No fuel in fuel filter
Starting motor cranks engine
sluggishly
Defective valve compression
Add fuel, see CHECK BEFORE
STARTING
Repair place where air is sucked
in
(
Replace pump or nozzle)
See ELECTRICAL SYSTEM
(
Adjust valve clearance)
Exhaust gas is white or blue
Too much oil in oil pan
Improper fuel
Add oil to specified level, see
CHECK BEFORE STARTING
Change to specified fuel
Exhaust gas occasionally turns
black
Clogged air cleaner element
Defective nozzle
Defective compression
Defective turbocharger
Clean or replace, see WHEN
REQUIRED
(
Replace nozzle)
(
Adjust valve clearance)
(
Clean or replace, turbocharger)
Combustion noise occasionally
makes breathing sound
Defective nozzle
Lack of fuel (in Air)
(
Replace nozzle)
Add fuel
Abnormal noise generated
(combustion or mechanical)
Low grade fuel being used
Overheating
Damage inside muffler
Excessive valve clearance
Change to specified fuel
See item "Indicator of water
temperature gauge is in red
range on right side of gauge".
(
Replace muffler)
(
Adjust valve clearance)
Monitor displays error code
Please contact your Komatsu distributor
Alarm buzzer sounds
Engine horsepower lowered
suddenly
(Engine is running in duration
mode)
3 - 152
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