Komatsu D51EX-24, Operation & Maintenance Manual

Page: 274 / 382

Problem Main causes Remedy
Steam spurts out from top of radiator.
(pressure valve) Lowered coolant level, leakage of
coolant Check, add coolant, repair by refer-
ring to CHECKS BEFORE START-
ING.
Dirt or scale accumulated in cooling
system Change coolant, flush inside of cool-
ing system by referring to WHEN RE-
QUIRED.
Clogged radiator fins or damaged fin Clean or repair. See WHEN RE-
QUIRED.
Defective thermostat Replace thermostat. (*)
Loose radiator filler cap (in high alti-
tude operation) Tighten the cap or replace packing.
Defective monitor Replace monitor. (*)
Engine coolant temperature caution
lamp lights up. Lowered coolant level, leakage of
coolant Check, add coolant, repair by refer-
ring to CHECKS BEFORE START-
ING.
Dirt or scale accumulated in cooling
system Change coolant, flush inside of cool-
ing system by referring to WHEN RE-
QUIRED.
Clogged radiator fins or damaged fin Clean or repair. See WHEN RE-
QUIRED.
Defective thermostat Replace thermostat. (*)
Loose radiator filler cap (in high alti-
tude operation) Tighten the cap or replace packing.
Defective monitor Replace monitor. (*)
Starting motor operates but engine
does not start. Lack of fuel Add oil to specified level. See
CHECKS BEFORE STARTING.
Air is mixed in fuel system. Repair the part where air is sucked in.
Defective fuel injection pump or de-
fective nozzle Replace pump or nozzle. (*)
Starting motor incapable of cranking
engine smoothly. See “PHENOMENA AND ACTIONS
FOR ELECTRICAL SYSTEM”.
Improper compression
(Incorrect valve clearance) Adjust valve clearance. (*)
Exhaust gas color is white or bluish. Excessive oil in oil pan Add oil to specified level. See
CHECKS BEFORE STARTING.
Improper fuel Replace with specified fuel.
Water entry in muffler Check and repair. (*)
Muffler breakage Replace muffler. (*)
Exhaust gas sometimes becomes
black. Muffler breakage Replace muffler. (*)
Combustion sound sometimes fluctu-
ates Defective nozzle Replace nozzle.
TROUBLES AND ACTIONS OPERATION
3-218