16. TROUBLESHOOTING
16.6 OTHER TROUBLE
16.6.1 ELECTRICAL SYSTEM
l (
): Always contact your Komatsu distributor when dealing with these items.
l 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
l Defective wiring (o Check, repair loose terminals,
disconnections)
l Adjust fan belt tension
For details, see EVERY 250
HOURS SERVICE
l Defective adjustment of fan belt
tension
Lamp flickers while engine is
running
Charge level monitor does not go
out even when engine is running
l Defective alternator
l Defective wiring
(o Replace)
(o Check, repair)
(o Replace) Abnormal noise is generated from
alternator
l Defective alternator
Starting motor does not turn when
starting switch is turned to ON
(o Check, repair)
l Charge
(o Replace)
(o Replace)
l Defective wiring
l Insufficient battery charge
l Defective starting motor
l Defective safety relay
Pinion of starting motor keeps going
in and out
l Charge
(o Replace)
l Insufficient battery charge
l Defective safety relay
l Insufficient battery charge
l Defective starting motor
Starting motor turns engine
sluggishly
l Charge
(o Replace)
a Defective wiring
l Insufficient battery charge
(o Check, repair)
l Charge
Starting motor disengages before
engine starts
Pre-heating monitor does not light
l Defective wiring
l Defective heater relay
l Defective monitor
(o Check, repair)
(o Replace)
(o Replace)
Oil pressure monitor does not
light up when engine is stopped
(starting switch at ON position)
l Defective monitor
l Defective caution lamp switch
(o Replace)
(o Replace)
Charge monitor does not light
up when engine is stationary
(when the starting switch is ON
position)
l Defective monitor
l Defective wiring
(o Replace)
(o Replace)
Outside of electrical heater is not
warm when touched by hand
l Defective wiring
l Disconnection in electric
heater
l Defective operation of
heater relay switch
(o Check, repair)
(o Replace)
(o Replace)
2-94
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