.
OPERATION
TROUBLESHOOTING
ENGINE
( ): Always contact your Komatsu distributor when dealing with these items.
In cases of abnormalities or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem
Main causes
Remedy
Engine oil pressure monitor lights
up
Insufficient oil in oil pan
Clogged oil filter cartridge
Oil leakage due to damage
caused by defective tightening of
oil pan, pipe joint
Disconnection, broken wiring to
sensor
Add oil to specified level. See
CHECK BEFORE STARTING
Replace cartridge, see EVERY
500 HOURS SERVICE
( Check, repair)
( Repair, connect wiring)
Steam spurts out from top of
radiator (pressure valve)
Insufficient coolant, water leakage
Loose fan belt
Dirt or scale accumulated in
cooling system
Radiator fins clogged or damaged
Defective water temperature
gauge
Defective thermostat
Defective thermostat seal
Loose radiator filler cap
Disconnection, broken wiring to
sensor
Check, add cooling water. See
CHECK BEFORE STARTING
Replace belt. See EVERY 500
HOURS SERVICE
Change coolant, clean inside of
cooling system. See WHEN
REQUIRED
Clean or repair. See EVERY 500
HOURS SERVICE
( Replace water temperature
gauge)
( Replace thermostat)
( Replace thermostat seal)
Tighten or replace cap
( Repair, connect wiring)
Radiator cooling water level
monitor lights up
Engine water temperature gauge is
in red range
Engine water temperature monitor
flashes
Engine water temperature gauge
display stays at lowest level and
does not rise
Defective water temperature
gauge monitor
Defective thermostat
In cold weather, cold wind is
blowing strongly against engine
( Replace water temperature
gauge monitor)
( Replace thermostat)
( Install radiator curtain)
Engine does not start even when
starting motor is turned
Insufficient fuel
Air in fuel system
No fuel in fuel filter
Starting motor cranks engine too
slowly
Starting motor does not turn
Defective valve clearance
(defective compression)
Add fuel. See CHECK BEFORE
STARTING
( Repair place where air is leaking
in)
Fill filter with fuel. See EVERY
500 HOURS SERVICE
See electrical components
See electrical components
( Adjust valve clearance)
Fuel stops from time to time
Crushed fuel tank breather tube
( Replace breather tube)
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Содержание HM400-1
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