Komatsu PC450-8, Operation & Maintenance Manual

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