Komatsu GD555-5 Operation & Maintenance Manual page 242

OPERATION
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
After warming-up operation, engine
oil pressure monitor lights up even
when engine speed is raised
Steam spurts out from top of
radiator sub-tank (pressure valve)
Water temperature gauge is in top
of red range
After warming-up operation, water
temperature gauge does not work
even when engine speed is raised
Main causes
Oil level in engine oil pan is low
(sucking in air)
Clogged oil filter cartridge
Leakage of oil due to damage,
defective tightening of oil pipe,
pipe join
Defective monitor
Defective oil pressure switch
Diluted with fuel, water
Defective pressure adjustment
valve
Coolant level is low.
Leakage of coolant
Abnormality in the hydraulic circuit
of the cooling fan
Dirt or scale accumulated in
cooling system
Radiator fins clogged or bent
Defective thermostat
Loose radiator filler cap (high
altitude operations)
Defective water temperature
gauge
Broken shroud or not installed
Defective pressure cap
Excessive load
efective thermostat
Defective water temperature
gauge
TROUBLESHOOTING
Remedy
Add oil to specified level
For details, see CHECK
BEFORE STARTING
Replace cartridge
For details, see EVERY 500
HOURS SERVICE
( Check, repair)
( Replace)
( Replace)
( Check, repair)
( Check valve, replace spring)
Check, add cooling water,
repair cooling system
For details, see WHEN
REQUIRED
( Check, repair)
Change cooling water,
clean cooling system
For details, see WHEN
REQUIRED
Clean or repair
For details, see EVERY 500
HOURS SERVICE
( Replace thermostat)
Tighten cap or replace packing
( Replace)
( Check, repair, install)
Replace
( Check brake, check defective
return of parking brake)
( Replace thermostat)
( Replace water temperature
gauge)
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