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16.7.3 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 is emitted from top part of
radiator (pressure valve)
Radiator water level monitor lights
up
Engine does not start when start-
ing 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 dam-
aged 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 dam-
aged fin
• Defectie 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
° Defective valve clearance
16. TRO UBLESHOOTING
Remedy
• Add oil to specified level, see
CHECK BEFORE STARTING
• Replace cartridge, see EVERY
250 HOURS SERVICE
(• Check, repair)
(• Replace sensor)
• Add cooling water, repair, see
CHECK BEFORE STARTING
• Adjust fan belt tension, see
EVERY 1000 HOURS SERV-
ICE
• 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)
• Add fuel, see CHECK BE-
FORE STARTING
• Repair place where air is
sucked in, see EVERY 500
HOURS SERVICE
(• Replace pump or nozzle)
See ELECTRICAL SYSTEM
(° Adjust valve clearance)
2-105
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