.
OPERATION
TROUBLES AND ACTIONS
Engine
( ): Always contact your Komatsu distributor when dealing with these items.
In cases of problem or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem
Main causes
Remedy
Engine oil pressure monitor lights
up
Oil level low in oil pan (sucking
air in)
Clogging oil filter cartridge
Defective tightening of oil pipe,
pipe joint, oil leakage from
damaged point
Defective monitor
Add oil to specified level, see
CHECK BEFORE STARTING
Replace cartridge, see EVERY
500 HOURS SERVICR
(
Check, repair)
(
Replace)
Steam spurts out from top of
radiator (pressure valve)
Coolant level low, leakage of
water
Loose fan belt
Dirt scale accumulated in cooling
system
Clogging radiator fins or
damages fins
Defective thermostat
Loose radiator filler cap (high
altitude operations)
Defective water level sensor
Check, add coolant, repair, see
CHECK BEFORE STARTING
Adjust fan belt tension, see
EVERY 250 HOURS SERVICE
Change coolant, flush inside of
cooling system, see WHEN
REQUIRED
Clean or repair, see EVERY
500 HOURS SERVICE
(
Replace thermostat)
Tightening cap or replace
packing
(
Replace sensor)
Red range of engine coolant
temperature gauge lights up
White range of engine coolant
temperature gauge in light up even
after operating for long time
Defective thermostat
(
Replace thermostat)
Engine dose 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
Pre-heating monitor dose not
light up
Defective compression
Defective valve clearance
Add fuel, see CHECK BEFORE
STARTING
Repair place where air in
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 mach oil in oil pan
Improper fuel
Rapid acceleration right after the
engine start-up in cold
temperature
Set oil in specified level, see
CHECK BEFORE STARTING
Change to specified fuel
Avoid rapid acceleration until
after the engine warming-up
Exhaust gas sometimes becomes
black
Clogging air cleaner element
Defective nozzle
Defective compression
Clean or replace, see WHEN
REQUIRED
(
Replace nozzle)
(
See "Defective compression")
Combustion noise occasionally
make breathing sound
Defective nozzle
(
Replace nozzle)
3 - 137
Содержание PC78MR-6
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