Komatsu PC290LC-11 Operation & Maintenance Manual page 341

OPERATION
Problem
Steam spurts out from top of radiator
(pressure valve).
Radiator coolant level caution lamp
lights up.
Starting motor turns but engine does
not start
Exhaust gas color is white or bluish.
Exhaust gas turns black from time to
time.
Combustion makes breathing sound
from time to time.
Main causes
Lowered coolant level, leakage of
coolant
Accumulation of dirt or scale in cool-
ing system
Clogged radiator fins or damaged fin
Defective thermostat
Loosened radiator filler cap (in high
altitude operation)
Defective coolant level sensor
Defective monitor
Lowered coolant level, leakage of
coolant
Accumulation of dirt or scale in cool-
ing system
Clogged radiator fins or damaged fin
Defective thermostat
Loosened radiator filler cap (in high
altitude operation)
Defective coolant level sensor
Defective monitor
Lack of fuel
Air in fuel system
Defective fuel injection pump or de-
fective nozzle
Starting motor turns engine sluggish-
ly.
Preheating pilot lamp does not light
up.
Defective compression
(Defective valve clearance)
Water entry in KDPF
Broken KDPF
Excessive oil in oil pan
Improper fuel
Broken KDPF
Defective nozzle
TROUBLES AND ACTIONS
Remedy
Check, add coolant, repair. See
CHECKS BEFORE STARTING.
Change coolant, flush inside of cool-
ing system. See WHEN REQUIRED.
Clean or repair. See EVERY 500
HOURS MAINTENANCE.
Replace thermostat. (*)
Tighten cap or replace packing.
Replace sensor. (*)
Replace monitor. (*)
Check, add coolant, repair. See
CHECKS BEFORE STARTING.
Change coolant, flush inside of cool-
ing system. See WHEN REQUIRED.
Clean or repair. See EVERY 500
HOURS MAINTENANCE.
Replace thermostat. (*)
Tighten cap or replace packing.
Replace sensor. (*)
Replace monitor. (*)
Add fuel. See CHECKS BEFORE
STARTING.
Repair place where air is sucked in.
See EVERY 500 HOURS MAINTE-
NANCE.
Replace pump or nozzle (*)
See ELECTRICAL SYSTEM.
See ELECTRICAL SYSTEM.
Adjust valve clearance. (*)
Check, repair. (*)
Replace KDPF. (*)
Set it to specified oil level. See
CHECKS BEFORE STARTING.
Replace with specified fuel.
Replace KDPF. (*)
Replace nozzle. (*)
3-269