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TROUBLES AND ACTIONS
OTHER TROUBLE
Electrical System
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
Lamp does not glow brightly even
when the engine runs at high
speed
Lamp flickers while engine is running
Charge level monitor does not go
out even when engine is running
Abnormal noise is generated from
alternator
Starting motor does not turn when
starting switch is turned to ON
Pinion of starting motor keeps
going and out
Starting motor turns engine sluggishly
Starting motor disengages before
engine starts
Pre-heating monitor does not light
Oil pressure monitor does not light
up when engine is stopped (starting
switch at ON position)
Charge level monitor does not light
up when engine is stopped (starting
switch at ON position)
3-246
Main causes
•Defective wiring
•Deterioration of battery
•Defective adjustment of V belt
tension
•Defective alternator
•Defective wiring
•Defective alternator
•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.
•Insufficient battery charge
•Defective safety relay (direct
starting motor)
•Insufficient battery charge
•Defective starting motor
•Defective wiring
•Insufficient battery charge
•Defective link gear pinion
•Defective wiring
•Defective heater relay
•Defective monitor
•Defective monitor
•Defective wiring
•Defective sensor
•Defective monitor
•Defective wiring
OPERATION
Remedy
(•Check, repair loose terminals,
disconnections)
•Check, adjust V belt tension
For details, see EVERY 250
HOURS SERVICE
(•Replace)
(•Check, repair)
(•Replace)
(•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.
•Charge
(•Replace)
•Charge
(•Replace)
(•Check, repair)
(•Replace)
(•Replace)
(•Check, repair)
(•Replace)
(•Replace)
(•Replace)
(•Check, repair)
(•Replace)
(•Replace)
(•Check, repair)
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