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TROUBLES AND ACTIONS
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
Engine oil pressure monitor lights
up
Steam spurts out from top of
radiator (pressure valve)
Radiator coolant level monitor
lights up
Engine does not start when starting
motor is turned
Exhaust gas is white or blue
Exhaust gas occasionally turns
black
Combustion noise occasionally
make breathing sound
3 - 144
Main causes
Engine oil pan oil level is low
(sucking in air)
Clogged oil filter cartridge
Defective tightening of oil pipe,
pipe joint, oil leakage from
damaged point
Defective engine oil pressure
sensor
Defective monitor
Coolant level low, leakage of
water
Loose fan belt
Dirt or scale accumulated in
cooling system
Clogged radiator fins or
damaged fins
Defective thermostat
Loose radiator filler cap
(high-altitude operations)
Defective water level sensor
Defective monitor
Lack of fuel
Air in fuel system
Defective fuel injection pump or
defective nozzle
Starting motor cranks engine
sluggishly
Engine pre-heating monitor does
not light up
Defective compression
(efective valve clearance)
Too much oil in oil pan
Improper fuel
Clogged air cleaner element
Defective nozzle
Defective compression
Defective turbocharger
Defective nozzle
Remedy
Add oil to specified level, see
CHECK BEFORE STARTING
Replace cartridge, see EVERY
500 HOURS SERVICE
( Check, repair)
( Replace sensor)
( Replace monitor)
Check, add coolant, repair, see
CHECK BEFORE STARTING
Check fan belt tension, adjust,
replace
Change coolant, flush inside of
cooling system, see WHEN
REQUIRED
Clean or repair, see EVERY 500
HOURS SERVICE
( Replace thermostat)
Tighten cap or replace packing
( Replace sensor)
( Replace monitor)
Add fuel, see CHECK BEFORE
STARTING
Repair place where air is sucked
in, see EVERY 500 HOURS
SERVICE
( Replace pump or nozzle)
See ELECTRICAL SYSTEM
See ELECTRICAL SYSTEM
( Adjust valve clearance)
Set oil to specified level, see
CHECK BEFORE STARTING
Change to specified fuel
Clean or replace, see WHEN
REQUIRED
( Replace nozzle)
( See defective compression
above)
( Clean or replace turbocharger)
( Replace nozzle)
OPERATION
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