Problem Main causes Remedy
Lamp flickers while engine is run-
ning.
Defective wiring Check and repair loose terminals,
open circuit. (*)
Defective belt Check the belt and replace it. See
EVERY 500 HOURS MAINTE-
NANCE.
Unusual noise is generated from al-
ternator.
Defective alternator Replace. (*)
Battery charge level caution lamp
lights up while engine is running.
Defective alternator Replace. (*)
Defective wiring Check, repair. (*)
Defective belt Check the belt and replace it. See
EVERY 500 HOURS MAINTE-
NANCE.
Starting motor does not rotate even
when starting switch is turned to
START position.
Defective wiring Check, repair. (*)
Defective starting motor Replace. (*)
Battery disconnect switch is at OFF
position.
Turn it to ON position.
Engine shutdown secondary switch
at “engine stop” position
Set it “NORMAL” position.
Close the cover.
Insufficient battery charge Charge the battery.
Pinion of starting motor repeats en-
gaging and disengaging (rattles).
Insufficient battery charge Charge the battery.
Defective starting motor Replace. (*)
Starting motor turns engine sluggish-
ly.
Insufficient battery charge Charge the battery.
Defective starting motor Replace. (*)
Starting motor disengages before
engine starts.
Defective wiring Check, repair. (*)
Insufficient battery charge Charge the battery.
Preheating pilot lamp does not light
up.
Defective wiring Check, repair. (*)
Defective heater relay, intake air tem-
perature sensor, coolant temperature
sensor
Replace. (*)
Defective monitor Replace monitor. (*)
Engine does not start.
(“L04” lights up on monitor.)
Damaged data in the controller Check, repair. (*)
Other system troubles Check, repair. (*)
PHENOMENA AND ACTIONS FOR CHASSIS
• Contact your Komatsu distributor for the remedies indicated with (*) in the remedy column.
• Ask your Komatsu distributor for repairs for problems or causes which are not listed below.
Problem
Main causes Remedy
Transmission
Engine runs but machine does not
move.
Parking brake is applied. Release the parking brake.
Directional lever or directional selec-
tor switch is not switched completely.
Switch the directional lever or direc-
tional selector switch completely.
Lack of oil in transmission case Add oil to specified level. For details,
see WHEN REQUIRED.
TROUBLES AND ACTIONS OPERATION
3-292
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