Komatsu D37EX-24 Operation & Maintenance Manual page 275

OPERATION
Problem
Steam spurts out from top of radiator.
(pressure valve)
Engine coolant temperature caution
lamp lights up.
Starting motor operates but engine
does not start.
Exhaust gas color is white or bluish.
Exhaust gas sometimes becomes
black.
Combustion sound sometimes fluctu-
ates
Main causes
Lowered coolant level, leakage of
coolant
Dirt or scale accumulated in cooling
system
Clogged radiator fins or damaged fin
Defective thermostat
Loose radiator filler cap (in high alti-
tude operation)
Defective monitor
Lowered coolant level, leakage of
coolant
Dirt or scale accumulated in cooling
system
Clogged radiator fins or damaged fin
Defective thermostat
Loose radiator filler cap (in high alti-
tude operation)
Defective monitor
Lack of fuel
Air is mixed in fuel system.
Defective fuel injection pump or de-
fective nozzle
Starting motor incapable of cranking
engine smoothly.
Improper compression
(Incorrect valve clearance)
Excessive oil in oil pan
Improper fuel
Water entry in muffler
Muffler breakage
Muffler breakage
Defective nozzle
TROUBLES AND ACTIONS
Remedy
Check, add coolant, repair by refer-
ring to CHECKS BEFORE START-
ING.
Change coolant, flush inside of cool-
ing system by referring to WHEN RE-
QUIRED.
Clean or repair. See WHEN RE-
QUIRED.
Replace thermostat. (*)
Tighten the cap or replace packing.
Replace monitor. (*)
Check, add coolant, repair by refer-
ring to CHECKS BEFORE START-
ING.
Change coolant, flush inside of cool-
ing system by referring to WHEN RE-
QUIRED.
Clean or repair. See WHEN RE-
QUIRED.
Replace thermostat. (*)
Tighten the cap or replace packing.
Replace monitor. (*)
Add oil to specified level. See
CHECKS BEFORE STARTING.
Repair the part where air is sucked in.
Replace pump or nozzle. (*)
See "PHENOMENA AND ACTIONS
FOR ELECTRICAL SYSTEM".
Adjust valve clearance. (*)
Add oil to specified level. See
CHECKS BEFORE STARTING.
Replace with specified fuel.
Check and repair. (*)
Replace muffler. (*)
Replace muffler. (*)
Replace nozzle.
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