Komatsu GALEO HM350-2 Operation & Maintenance Manual page 187

TROUBLESHOOTING
ENGINE
( ): Always contact your Komatsu distributor when dealing with these items.
In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem
Engine oil pressure monitor lights
up
Steam spurts out from top of
radiator (pressure valve)
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
Engine does not start even when
starting motor is turned
Fuel stops from time to time
3 - 138
Main causes
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
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 sub-tank filler cap
Disconnection, broken wiring to
sensor
Defective water temperature
gauge monitor
Defective thermostat
In cold weather, cold wind is
blowing strongly against engine
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)
Crushed fuel tank breather tube
Remedy
Add oil to specified level. See
CHECK BEFORE STARTING
Replace cartridge, see EVERY
500 HOURS SERVICE
( Check, repair)
( Repair, connect wiring)
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)
( Replace water temperature
gauge monitor)
( Replace thermostat)
( Install radiator curtain)
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)
( Replace breather tube)
OPERATION