16. TROUBLESHOOTING
16.6.3 ENGINE
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1: Always contact your Komatsu distributor when dealing with these items.
l In cases of abnormalities or causes which are not listed below, please contact your Komatsu
distributor for repairs.
Problem
Engine oil pressure monitor
lights up
Steam is emitted from top part
of radiator (pressure valve)
Radiator water level monitor
lights up
Engine does not start when
starting motor is turned
Main causes
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 engine oil pressure
sensor
Cooling water level low, water
leakage
Loosen fan belt
Dirt or scale accumulated in
cooling system
Clogged radiator fin or
damaged fin
Defective thermostat
Loose radiator filler cap (high
altitude operation)
Defective water level sensor
Lack of fuel
Air in fuel system
Defective fuel injection pump or
nozzle
Starting motor cranks engine
sluggishly
Preheating monitor does not
light up
Defective compression
o Defective valve clearance
Remedy
l Add oil to specified level, see
CHECK BEFORE STARTING
l Replace cartridge, see EVERY
250 HOURS SERVICE
(o Check, repair)
(o Replace sensor)
Add cooling water, repair, see
CHECK BEFORE STARTING
Adjust fan belt tension, see
EVERY 250 HOURS SERVICE
Change cooling water, clean
inside of cooling system, see
WHEN REQUIRED
Clean or repair, see EVERY
500 HOURS SERVICE
Replace thermostat)
Tighten cap or replace packing
Replace sensor)
l Add fuel, see CHECK
BEFORE STARTING
l Repair place where air is
sucked in, see EVERY 500
HOURS SERVICE
(e Replace pump or nozzle)
1
J
See ELECTRICAL SYSTEM
(o Adjust valve clearance)
2-96
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