Operation 3.7 Troubleshooting 3.7.4 Other trouble Electrical system z ( ): Always contact your KOMATSU distributor when deal- ing with these items. z In cases of abnormalities or causes which are not listed below, please contact your KOMATSU distributor for repairs.
WA150-5H – VEAM934100 3-117 Problem Main causes Remedy Lamp does not glow brightly even when the engine runs at high speed Lamp flickers while engine is run- ning z Defective wiring z Defective adjustment of belt ten- sion z (Check, repair loose terminals, disconnections) z Check, Adjust alternator driving belt tension For details, see EVERY 1000 HOURS SERVICE Even when the engine is rotating, the charge caution pilot lamp does not go out z Defective alternator z Defective wiring z Defective adjustment of alterna- tor driving belt tension z (Replace) z (Check, repair) z Check, Adjust alternator driving belt tension For details, see EVERY 1000 HOURS SERVICE Abnormal noise is generated from alternator z Defective alternator z (Replace) Starting motor does not turn when starting switch is turned to START z Defective wiring z Insufficient battery charge z Defective starting motor z (Check, repair) z Charge z (Check, repair) Pinion of starting motor keeps going in and out z Insufficient battery charge z Charge Starting motor turns engine slug- gishly z Insufficient battery charge z Defective starting motor z Charge z (Replace) Starting motor disengages before engine starts z Defective wiring z Insufficient battery charge z (Check, repair) z Charge Preheating pilot lamp does not light up z Defective wiring z Defective heater relay, preheat- ing water temperature sensor z Defective preheating pilot lamp z (Check, repair) z (Replace) (Replace) Even when engine is stopped, charge caution pilot lamp does not light up (starting switch at ON posi- tion) z Defective wiring z Defective monitor z (Check, repair) z (Replace) Even when engine is stopped, engine oil pressure caution pilot lamp does not light up (starting switch at ON position) z Defective pilot lamp z Defective pressure caution lamp z Defective monitor z (Replace) z (Replace) z (Replace)