Komatsu WA380-6 Operation & Maintenance Manual page 235

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
Engine oil pressure caution lamp
lights up
Steam is emitted from top part of
radiator (pressure valve)
Engine water temperature gauge
is in red range
Engine cooling water temperature
caution lamp lights up
Engine water temperature gauge
is in white range
Engine does not start when
starting motor is turned
Exhaust gas is white or blue
3 - 178
Main causes
Low engine oil pan oil level
(sucking in air)
Clogged oil filter cartridge
Defective tightening of oil pipe
joint, oil leakage from damaged
part
Defective monitor
Low cooling water level, water
leakage
Defective fan pump or motor
Dirt or scale accumulated in
cooling system
Clogged radiator fin or damaged
fin
Defective thermostat
Defective thermostat seal
Loose radiator filler cap (high
altitude operation)
Defective monitor
Defective thermostat
Defective monitor
Lack of fuel
Air in fuel system
No fuel in fuel filter
Defective injection pump or
injector
Starting motor cranks engine too
slowly
Starting motor does not turn
Preheating pilot lamp does not
light up
Defective valve clearance
(Defective compression)
Too much oil in oil pan
Improper fuel
Remedy
Add oil to specified level, see
CHECK BEFORE STARTING
Replace cartridge, see EVERY
500 HOURS SERVICE
( Check, repair)
( Replace)
Check, add cooling water, repair,
see WHEN REQUIRED
( Check, repair)
Change cooling water, clean
inside of cooling system, see
WHEN REQUIRED
Clean or repair, see WHEN
REQUIRED
( Replace thermostat)
( Replace thermostat seal)
Tighten cap or replace packing
( Replace)
( Replace thermostat)
( Replace)
Add fuel, see CHECK BEFORE
STARTING
Repair place where air is sucked
in
Fuel filter with fuel. See EVERY
500 HOURS SERVICE
( Replace pump or injector)
See ELECTRICAL SYSTEM
See ELECTRICAL SYSTEM
See ELECTRICAL SYSTEM
( Adjust valve clearance)
Add oil to specified level, see
CHECK BEFORE STARTING
Change to specified fuel
OPERATION