Komatsu PC15MRX-1 Operation And Maintenance Manual page 139

OPERATION
ENGINE
( ): Always contact your Komatsu distributor when dealing with these items.
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 spurts out from top of radia-
tor (pressure valve)
Radiator water level monitor lights
up
Engine does not start when starting
motor is turned
Exhaust gas is white or blue
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 dam-
aged point
Defective engine oil pressure
sensor
Defective monitor
Cooling water level low, leakage
of water
Loose fan belt
Dirt or scale accumulated in
cooling system
Clogged radiator fins or dam-
aged fins
Defective thermostat
Loose radiator filler cap (high-
altitude operations)
Defective water level sensor
Lack of fuel
Air in fuel system
Defective fuel injection pump or
defective nozzle
Starting motor cranks engine
sluggishly
Preheating monitor does not
light up
Defective compression
Defective valve clearance
Too much oil in oil pan
Improper fuel
TROUBLESHOOTING
Remedy
Add oil to specified level, see
CHECK BEFORE STARTING
Replace cartridge, see EVERY
250 HOURS SERVICE
( Check, repair)
( Replace sensor)
( Replace)
Check, add water, repair, see
CHECK BEFORE STARTING
Adjust fan belt tension. For
details, see EVERY 250
HOURS SERVICE.
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)
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
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