Komatsu WA800-3E0, Operation & Maintenance Manual

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OPERATION
TROUBLESHOOTING
3-155
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 hight speed •Defective wiring
•Defective adjustment of alternator
best tension
(•Check, repair loose terminals,
disconnections)
•Adjust alternator belt tension
For details, see EVERY 250
HOURS SERVICE
Lamp flickers while engine is running
Battery charge caution pilot lamp
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
•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
Pre-heating monitor does not light •Defective wiring
•Defective heater relay
•Defective monitor pilot lamp (•Check, repair)
(•Replace)
(•Replace)
Engine oil pressure monitor lamp
does not light up when engine is
stopped (starting switch at ON posi-
tion) •Defective wiring
•Defective wiring, defective sensor (•Replace)
(•Check, repair, replace)
Battery charge caution pilot lamp
does not light up when engine is
stopped
(starting switch at ON position) •Defective wiring
•Defective monitor (•Check, repair)
(•Replace)
Outside of electrical heater is not
warm when touched by hand •Defective wiring
•Disconnection in electrical heater
•Defective operation of heater relay
switch (•Check, repair)
(•Replace)
(•Replace heater switch)