Other Trouble; Electrical System - Komatsu WA320-5H Operation & Maintenance Manual

OPERATION

OTHER TROUBLE

ELECTRICAL SYSTEM

q (
): Always contact your Komatsu distributor when dealing with these items.
q In cases of abnormalities or causes which are not listed below, please 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
Even when the engine is rotating,
the charge caution pilot lamp does
not go out
Abnormal noise is generated from
alternator
Starting motor does not turn when
starting switch is turned to START
Pinion of starting motor keeps going
in and out
Starting motor turns engine slug-
gishly
Starting motor disengages before
engine starts
Preheating pilot lamp does not light
up
Even when engine is stopped,
charge caution pilot lamp does not
light up (starting switch at ON posi-
tion)
Even when engine is stopped,
engine oil pressure caution pilot
lamp does not light up (starting
switch at ON position)
Main causes
•Defective wiring
•Defective adjustment of belt ten-
sion
•Defective alternator
•Defective wiring
•Defective adjustment of fan belt
tension
•Defective alternator
•Defective wiring
•Insufficient battery charge
•Defective starting motor
•Insufficient battery charge
•Insufficient battery charge
•Defective starting motor
•Defective wiring
•Insufficient battery charge
•Defective wiring
•Defective heater relay, preheating
water temperature sensor
•Defective preheating pilot lamp
•Defective wiring
•Defective monitor
•Defective pilot lamp
•Defective pilot lamp switch
•Defective monitor
TROUBLESHOOTING
Remedy
(•Check, repair loose terminals,
disconnections)
•Check, Adjust fan belt tension
For details, see EVERY 1000
HOURS SERVICE
(•Replace)
(•Check, repair)
•Check, Adjust fan belt tension
For details, see EVERY 1000
HOURS SERVICE
(•Replace)
(•Check, repair)
•Charge
(•Check, repair)
•Charge
•Charge
(•Replace)
(•Check, repair)
•Charge
(•Check, repair)
(•Replace)
(•Replace)
(•Check, repair)
(•Replace)
(•Replace)
(•Replace)
(•Replace)
3
3
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