OPERATION TROUBLESHOOTING
3-145
ENGINE 3
q ( ): Always contact your Komatsu distributor when dealing with these items.
q In cases of problem or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem Main causes Remedy
Engine oil pressure caution lamp
flashes when engine speed is raised
after completion of warm-up
•Engine oil pan oil level is low (suck-
ing in air)
•Clogged oil filter cartridge
•Defective tightening of oil pipe joint,
oil leakage from damaged part
•Defective monitor panel
•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)
•Coolant level low, water leakage
•Dirt or scale accumulated in cooling
system
•Clogged radiator fins or damaged
fins
•Defective thermostat
•Loose radiator filler cap (high alti-
tude operation)
•Defective monitor panel
•Add coolant, repair, see
CHECK BEFORE STARTING
•Change coolant, clean
inside of cooling system, see
WHEN REQUIRED
•Clean or repair, see WHEN
REQUIRED
(•Replace thermostat)
•Tighten cap or replace packing
(•Replace)
Engine coolant temperature caution
lamp flashes
Engine does not start when starting
motor is turned
•Lack of fuel
•Air in fuel system
•No fuel in fuel filter
•Starting motor cranks engine slug-
gishly
•Defective valve compression
•Add fuel, see CHECK BEFORE
STARTING
•Repair place where air is sucked
in
(•Replace pump or nozzle)
•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 nozzle
•Defective compression
•Defective turbocharger
•Clean or replace, see WHEN
REQUIRED
(•Replace nozzle)
(•Adjust valve clearance)
(•Clean or replace, turbocharger)
Combustion noise occasionally
makes breathing sound
•Defective nozzle
•Lack of fuel (in Air)
(•Replace nozzle)
•Add fuel
Abnormal noise generated (combus-
tion or mechanical)
•Low grade fuel being used
•Overheating
•Damage inside muffler
•Excessive valve clearance
•Change to specified fuel
•See item “Indicator of water
temperature gauge is in red
range on right side of gauge“.
(•Replace muffler)
(•Adjust valve clearance)
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