Komatsu PC450-8 Operation & Maintenance Manual page 262

TROUBLES AND ACTIONS
OTHER TROUBLE
Electrical System
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
Lamp does not glow brightly even
when the engine runs at high speed
Lamp flickers while engine is run-
ning
Charge level monitor does not go
out even when engine is running
Abnormal noise is generated from
alternator
Starting motor does not turn when
starting switch is turned to ON
Pinion of starting motor keeps going
and out
Starting motor turns engine slug-
gishly
Starting motor disengages before
engine starts
Engine pre-heating monitor does not
light
Oil pressure monitor does not light
up when engine is stopped (starting
switch at ON position)
Outside of electrical heater is not
warm when touched by hand
3-196
Main causes
•Defective wiring, deterioration of
battery
•Loose fan belt
•Defective alternator
•Defective wiring
•Defective alternator
•Defective wiring
•Defective starting motor
•Insufficient battery charge
•Insufficient battery charge
•Defective safety relay
•Insufficient battery charge
•Defective starting motor
•Defective wiring, defective ring gear
pinion
•Insufficient battery charge
•Defective wiring
•Defective heater relay
•Defective monitor
•Defective monitor
•Defective caution lamp switch
•Defective wiring
•Disconnection in electric heater
•Defective operation of heater relay
switch
OPERATION
Remedy
(•Check, repair loose terminals,
disconnections, replace battery)
•Check fan belt tension, replace
(•Replace)
(•Check, repair)
(•Replace)
(•Check, repair)
(•Replace)
•Charge
•Charge
(•Replace)
•Charge
(•Replace)
(•Check, repair)
•Charge
(•Check, repair)
(•Replace)
(•Replace)
(•Replace)
(•Replace)
(•Check, repair)
(•Replace)
(•Replace)
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