TROUBLES AND ACTIONS OPERATION
3-246
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 high
speed
•Defective wiring
•Deterioration of battery
•Defective adjustment of V belt
tension
(•Check, repair loose terminals,
disconnections)
•Check, adjust V belt tension
For details, see EVERY 250
HOURS SERVICE
Lamp flickers while engine is running
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
•Defective safety relay
•Defective engine controller
•The lock lever is in the LOCK posi-
tion.
•The engine emergency stop
switch is in the ON position.
•The hydraulic tank strainer is not
installed normally.
•The starter isolator switch is in the
OFF position.
•The battery isolator switch is in the
OFF position.
(•Check, repair)
(•Replace)
•Charge
(•Replace)
(•Replace)
•Set the lever in the FREE position.
•Turn the switch to the OFF posi-
tion.
(•Check, repair)
•Turn the starter isolator switch to
the OFF position.
•Turn the battery isolator switch to
the OFF position.
Pinion of starting motor keeps
going and out
•Insufficient battery charge
•Defective safety relay (direct
starting motor)
•Charge
(•Replace)
Starting motor turns engine sluggishly
•Insufficient battery charge
•Defective starting motor
•Charge
(•Replace)
Starting motor disengages before
engine starts
•Defective wiring
•Insufficient battery charge
•Defective link gear pinion
(•Check, repair)
(•Replace)
(•Replace)
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 (starting
switch at ON position)
•Defective monitor
•Defective wiring
•Defective sensor
(•Replace)
(•Check, repair)
(•Replace)
Charge level monitor does not light
up when engine is stopped (starting
switch at ON position)
•Defective monitor
•Defective wiring
(•Replace)
(•Check, repair)
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