Komatsu PC350LC-8, Operation & Maintenance Manual

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OPERATION
TROUBLES AND ACTIONS
3-211
Engine 3
q
( ): Always contact your Komatsu distributor when dealing with these items.
q
In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem Main causes Remedy
Engine oil pressure monitor lights
up
•Engine oil pan oil level is low
(sucking in air)
•Clogged oil filter cartridge
•Defective tightening of oil pipe,
pipe joint, oil leakage from
damaged point
•Defective engine oil pressure
sensor
•Defective monitor
•Add oil to specified level, see
CHECK BEFORE STARTING
•Replace cartridge, see EVERY
500 HOURS SERVICE
(•Check, repair)
(•Replace sensor)
(•Replace monitor)
Steam spurts out from top of
radiator (pressure valve) •Coolant level low, leakage of
water
•Loose fan belt
•Dirt or scale accumulated in
cooling system
•Clogged radiator fins or
damaged fins
•Defective thermostat
•Loose radiator filler cap
(high-altitude operations)
•Defective coolant level sensor
•Defective monitor
•Check, add coolant, repair, see
CHECK BEFORE STARTING
(•Check fan belt tension, replace)
•Change coolant, flush inside of
cooling system, see WHEN
REQUIRED
•Clean or repair, see EVERY 500
HOURS SERVICE
(•Replace thermostat)
•Tighten cap or replace packing
(•Replace sensor)
(•Replace monitor)
Radiator coolant level monitor
lights up
Engine does not start when starting
motor is turned
•Lack of fuel
•Air in fuel system
•Defective fuel injection pump or
defective nozzle
•Starting motor cranks engine
sluggishly
•Engine pre-heating monitor does
not light up
•Defective compression
(Defective valve clearance)
•Add fuel, see CHECK BEFORE
STARTING
•Repair place where air is sucked
in, see EVERY 500 HOURS
SERVICE
(•Replace pump or nozzle)
•See ELECTRICAL SYSTEM
•See ELECTRICAL SYSTEM
(•Adjust valve clearance)
Exhaust gas is white or blue
•Too much oil in oil pan
•Improper fuel
•Set 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)
(•See defective compression
above)
(•Clean or replace turbocharger)
Combustion noise occasionally
make breathing sound
•Defective nozzle (•Replace nozzle)