Komatsu HB365LC-3 Operation & Maintenance Manual page 346

TROUBLES AND ACTIONS
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.
3-274
Main causes
Lowered coolant level, leakage of
coolant
Dirt or scale accumulated in cooling
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
Dirt or scale accumulated in cooling
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 caution 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
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 oil to specified level. See
CHECKS BEFORE STARTING.
Replace with specified fuel.
Replace KDPF. (*)
Replace nozzle. (*)
OPERATION