OPERATION TROUBLESHOOTING
3-137
ENGINE 0.
! ( ): 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 Main causes Remedy
Engine oil pressure caution pilot
lamp lights up
•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 monitor
•Add oil to specified level, see
CHECK BEFORE STARTING
•Replace cartridge, see EVERY
500 HOURS SERVICE
(•Check, repair)
(•Replace)
Steam is emitted from top part of
radiator (pressure valve)
Water temperature gauge is in red
range
Coolant temperature monitor lights
up
•Cooling water level low, water
leakage
•Defective fan pump or motor
•Dirt or scale accumulated in cool-
ing system
•Clogged radiator fin or damaged
fin
•Defective thermostat
•Defective thermostat seal
•Loose radiator filler cap (high alti-
tude operation)
•Defective monitor
•Check, add cooling water,
repair, see WHEN REQUIRED
(•Check, repair)
•Change cooling water, clean
inside of cooling system, see
WHEN REQUIRED
•Clean or repair, see WHEN
REQUIRED
(•Replace thermostat)
(•Replace thermostat seal)
•Tighten cap or replace packing
(•Replace)
Water temperature gauge is in
white range on left
•Defective thermostat
•Defective monitor
(•Replace thermostat)
(•Replace)
Engine does not start when start-
ing motor is turned
•Lack of fuel
•Air in fuel system
•No fuel in fuel filter
•Defective supply pump or injector
•Starting motor cranks engine too
slowly
•Starting motor does not turn
•Preheating pilot lamp does not
light up
•Defective valve clearance
(Defective compression)
•Add fuel, see CHECK BEFORE
STARTING
•Repair place where air is sucked
in
•Fuel filter with fuel. See EVERY
500 HOURS SERVICE
(•Replace pump or injector)
•See ELECTRICAL SYSTEM
•See ELECTRICAL SYSTEM
•See ELECTRICAL SYSTEM
(•Adjust valve clearance)
Exhaust gas is white or blue •Too much oil in oil pan
•Improper fuel
•Add oil to specified level, see
CHECK BEFORE STARTING
•Change to specified fuel
Exhaust gas occasionally turns
black
•Clogged air cleaner element
•Defective injector
•Defective compression
•Defective turbocharger
•Clean or replace, see WHEN
REQUIRED
(•Replace injector)
(•See defective compression
above)
(•Clean or replace turbocharger)
Combustion noise occasionally
makes breathing sound
•Defective nozzle
(•Replace nozzle)
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