Komatsu Utility 76243, Operation & Maintenance Manual

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OPERATION
TROUBLESHOOTING
3-149
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 caution lamp
•Add oil to specified level, see
CHECK BEFORE STARTING
•Replace cartridge, see EVERY
500 HOURS SERVICE
(•Check, repair)
(•Replace lamp)
Steam is emitted from top part of
radiator (pressure valve)
•Coolant level low, water leakage
•Loose fan belt
•Dirt or scale accumulated in cooling
system
•Clogged radiator fin or damaged fin
•Defective thermostat
•Loose radiator filler cap
(high altitude operation)
•Defective monitor panel
•Add coolant, repair, see
CHECK BEFORE STARTING
•Adjust fan belt tension, see
EVERY 250 HOURS SERVICE
•Change coolant, clean
inside of cooling system, see
WHEN REQUIRED
•Clean or repair, see WHEN
REQUIRED
(•Replace thermostat)
•Tighten cap or replace packing
(•Replace monitor panel)
Red range of coolant temperature
gauge flashes
White range of coolant temperature
gauge flashes •Defective thermostat
•Defective coolant temperature
gauge (•Replace thermostat)
(•Replace coolant temperature
gauge)
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
•Glow signal does not glow red
•Defective compression
•Defective valve clearance
•Add fuel, see CHECK BEFORE
STARTING
•Repair place where air is sucked
in
(•Fill fuel filter with fuel, see
EVERY 500 HOURS SERVICE)
•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 nozzle
•Defective compression
•Clean or replace, see WHEN
REQUIRED
(•Replace nozzle)
(•Adjust valve clearance)
Combustion noise occasionally
makes breathing sound
•Defective nozzle (•Replace nozzle)
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 “Red range of coolant
temperature gauge flashes“.
(•Replace muffler)
(•Adjust valve clearance)