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TROUBLESHOOTING
ENGINE
( ): Always contact your Komatsu distributor when dealing with these items.
In cases of abnormalities or causes which are not listed below, please contact your Komatsu distributor for
repairs.
Problem
Engine oil pressure caution lamp
remains alight when engine speed is
raised after completion of warm-up
Steem is emitted from top part of
radiator (pressure valve)
Indicator of water temperature
gauge is in red range on right side of
gauge
Indicator of water temperature
gauge is in white range on left side
of gauge
Engine dose not start when starting
motor is turned
Exhaust gas is white or blue
Exhaust gas occasionally turns black
Combustion noise occasionally
makes breathing sound
3-120
Main causes
Engine oil pan oil level is low
(sucking in air)
Clogged oil filter cartridge
Defective tightening of oil pipe
joint, oil leakage from damaged
part
Defective caution lamp
Cooling water level low, water
leakage
Loose fan belt
Dirt or scale accumulated in cool-
ing system
Clogged radiator fin or damaged
fin
Defective thermostat
Loose radiator filler cap (high
altitued operation)
Defective water temperature
gauge
Defective thermostat
Defective water temperature
gauge
Lack of fuel
Air in fuel system
Defective fuel injection pump or
nozzle
Starting motor cracks engine slug-
gishly
Glow signal dose not glow red
Defective compression
Defective valve clearance
Too mach oil in oil pan
Improper fuel
Clogged air cleaner element
Defective nozzle
Defective compression
Defective nozzle
OPERATION
Remedy
Add oil to specified level, see
CHECK BEFORE STARTING
Replace cartridge, see EVERY
500 HOURS SERVICE
(
Check, repair)
(
Replace)
Add cooling water, repair, see
CHECK BEFORE STARTING
Adjust fan belt tension, see
EVERY 250 HOURS SERVICE
Change cooling water, clean
inside of cooling system, see
WHEN REQUIRED
Clean or replace, see WHEN
REQUIRED
(
Replace thermostat)
Tightening cap or replace pack-
ing
(
Replace water temperature
gauge)
(
Replace thermostat)
(
Replace water temperature
gauge)
Add fuel, see CHECK BEFORE
STARTING
Repair place where air is sucked
in
(
Replace pump or nizzle)
See ELECTRICAL SYSTEM
See ELECTRICAL SYSTEM
(
Adjust valve clearance)
Add oil to specified level, see
CHECK BEFORE STARTING
Change to specified fuel
Clean or replace, see WHEN
REQUIRED
(
Replace nozzle)
(
Adjust valve clearance)
(
Replace nozzle)
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