Komatsu D65PX-12 Service Manual

TROUBLESHOOTING OPERATION
3-116
OTHER TROUBLE
ELECTRICAL SYSTEM
● ( ): Always contact your Komatsu distributor when dealing with these items.
● 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
● Defective wiring ( ● Check, repair loose terminals, dis-
connections)
Lamp flickers while engine is running
● Defective adjustment of fan belt ten-
sion
● Adjust fan belt tension For details,
see EVERY 250 HOURS SERVICE
Charge lamp does not go out even when
engine is running
● Defective alternator
● Defective wiring
(
● Replace)
(
● Check, repair)
Abnormal noise is generated from alter-
nator
● Defective alternator ( ● Replace)
Starting motor does not turn when start-
ing switch is turned to ON
● Defective wiring
● Insufficient battery charge
● Safety switch out of adjust
( ● Check, repair)
● Charge
(
● Adjust safety switch)
Pinion of starting motor keeps going in
and out
● Insufficient battery charge ● Charge
Starting motor turns engine sluggishly
● Insufficient battery charge
● Defective starting motor
● Charge
(
● Replace)
Starting motor disengages before engine
starts
● Defective wiring
● Insufficient battery charge
(
● Check, repair)
● Charge
Automatic preheating is not actuated
● Defective wiring
● Defective glow switch
● Defective timer
( ● Check, repair)
(
● Replace)
(
● Replace)
Glow signal lamp dose not go out
● Defective wiring
● Defective heater relay
(
● Check, repair)
(
● Replace)
Glow signal lamp does not become red
(gauge panel specification only)
● Defective wiring
● Defective heater relay
● Defective glow signal
( ● Check, repair)
(
● Replace)
(
● Replace)
Oil pressure caution lamp does not light
up when engine is stopped (starting
switch at ON position)
● Defective caution lamp
● Defective caution lamp switch
● Defective wiring
(
● Replace)
(
● Replace)
(
● Check, repair)
Charge lamp does not light up when
engine is stopped (starting switch at ON
position)
● Defective charge lamp
● Defective wiring
(
● Replace)
(
● Check, repair)
Outside of electrical intake air heater is
not warm when touched by hand
● Defective wiring
● Disconnection in electrical intake air
heater
● Defective operation of heater relay
switch
(
● Check, repair)
(
● Replace)
( ● Check,repair heater relay switch)
Air conditioner does not work properly
● Blown fuse
● Insufficient battery charge
● Defective air conditioner swtich
● Defective blower switch
● Defective compressor
(
● Check, repair)
● Charge
(
● Replace air conditioner switch)
(
● Replace blower switch)
(
● Replace)
Speed range display lamp does not light
up.
● Defective wiring
● Defective limit switch
● Defective display lamp
( ● Check, repair)
(
● Replace)
(
● Replace)
Speed range display lamp does not
change when gear is shifted.
● Defective wiring
● Defective limit switch
(
● Check, repair)
(
● Replace)

Komatsu D65PX-12 Specifications

General

Brand	Komatsu
Model	D65PX-12
Category	Construction Equipment
Language	English