TROUBLESHOOTING OPERATION
3-134
OTHER TROUBLE 0.
ELECTRICAL SYSTEM 0.
! ( ): Always contact your Komatsu distributor when dealing with these items.
! In cases of abnormalities or causes which are not listed below, please contact your Komatsu distributor for
repairs.
Problem Main causes Remedy
Lamp does not glow brightly even
when the engine runs at hight
speed
Lamp flickers while engine is run-
ning
•Defective wiring
•Defective adjustment of belt ten-
sion
(•Check, repair loose terminals,
disconnections)
•Adjust alternator belt tension
For details, see EVERY 250
HOURS SERVICE
Even when the engine is rotating,
the charge caution pilot lamp does
not go out
•Defective alternator
•Defective wiring
•Defective adjustment of alternator
belt tension
(•Replace)
(•Check, repair)
•Adjust alternator belt tension
For details, see EVERY 250
HOURS SERVICE
Abnormal noise is generated from
alternator
•Defective alternator (•Replace)
Starting motor does not turn when
starting switch is turned to ON
•Defective wiring
•Insufficient battery charge
(•Check, repair)
•Charge
Pinion of starting motor keeps
going in and out
•Insufficient battery charge •Charge
Starting motor turns engine slug-
gishly
•Insufficient battery charge
•Defective starting motor
•Charge
(•Replace)
Starting motor disengages before
engine starts
•Defective wiring
•Insufficient battery charge
(•Check, repair)
•Charge
Preheating pilot lamp does not
light up
•Defective wiring
•Defective glow relay, glow con-
troller, water temperature sensor
•Defective preheating pilot lamp
(•Check, repair)
(•Replace)
(•Replace)
Even when engine is stopped,
charge caution pilot lamp does not
light up (starting switch at ON
position)
•Defective wiring
•Defective monitor
(•Check, repair)
(•Replace)
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