2-70
Problem Main causes Remedy
Lamp does not glow brightly even ‡ Defective wiring (‡ Check, repair loose terminals,
when the engine runs at hight disconnections)
speed ‡ Defective adjustment of fan belt ‡ Adjust fan belt tension
tension For details, see EVERY 250
Lamp flickers while engine is HOURS SERVICE
running
Abnormal noise is generated from ‡ Defective alternator (‡ Replace)
alternator
Starting motor does not turn when ‡ Defective wiring (‡ Check, repair)
starting switch is turned to ON ‡ Insufficient battery charge ‡ Charge
Pinion of starting motor keeps going ‡ Insufficient battery charge ‡ Charge
in and out
Starting motor turns engine ‡ Insufficient battery charge ‡ Charge
sluggishly ‡ Defective starting motor (‡ Replace)
Starting motor disengages before ‡ Defective wiring (‡ Check, repair)
engine starts ‡ Insufficient battery charge ‡ Charge
Preheating pilot lamp does not light ‡ Defective wiring (‡ Check, repair)
up ‡ Defective glow relay, glow (‡ Replace)
controller, water temperature
sensor
‡ Defective preheating pilot lamp (‡ Replace)
Even when engine is stopped, ‡ Defective caution pilot lamp (‡ Replace)
engine oil pressure caution pilot ‡ Defective caution pilot lamp (‡ Replace)
lamp does not light up (starting switch
switch at ON position)
16. TROUBLESHOOTING 16. TROUBLESHOOTING
16.4 OTHER TROUBLE
16.4.1 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.
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