Komatsu PW160-7K Series, Operation And Maintenance Manual

Page: 217 / 358

OPERATION TROUBLESHOOTING
217
OTHER TROUBLE
ELECTRICAL SYSTEM
● ( ) 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 high
speed
● Defective wiring, deterioration of
battery
● (Check, repair loose terminals,
disconnections, replace bat-
tery)
Lamp flickers while engine is run-
ning
● Loose fan belt
● Check fan belt tension,
replace
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
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 (start-
ing 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)