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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 run-
ning
Charge level monitor does not go
out even when engine is running
Abnormal noise is generated from
alternator
Starting motor does not crank when
Starting switch is turned ON
Pinion of starting motor keeps going
in and out
Starting motor turns engine slug-
gishly
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)
3-150
Main causes
•Defective wiring
•Deteriorated battery
•Defective adjustment of V belt ten-
sion
•Defective alternator
•Defective wiring
•Defective alternator
•Defective wiring
•Defective starting motor
•Insufficient battery charge
•Defective safety relay
•Defective engine controller
•Insufficient battery charge
•Defective safety relay (direct start-
ing motor)
•Insufficient battery charge
•Defective starting motor
•Defective wiring,defective ring gear
pinion
•Insufficient battery charge
•Defective wiring
•Defective heater relay
•Defective monitor
•Defective monitor
•Defective sensor
•Defective wiring
•Defective monitor
•Defective wiring
OPERATION
Remedy
(•Check, repair loose terminals,dis-
connections)
(•Replace battery)
•Check, adjust V belt tension
For details, see EVERY 250
HOURS SERVICE
(•Replace)
(•Check, repair)
(•Replace)
(•Check, repair)
(•Replace)
•Charge
(•Replace)
(•Replace)
•Charge
(•Replace)
•Charge
(•Replace)
(•Check, repair)
•Charge
(•Check, repair)
(•Replace)
(•Replace)
(•Replace)
(•Replace)
(•Check, repair)
(•Replace)
(•Check, repair)
3
3
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