16. TROUBLESHOOTING 16.6 OTHER TROUBLE 16.6.1 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.
PC450-ENG 2-94 Problem Main causes Remedy Lamp does not glow brightly even when the engine runs at height speed • Defective wiring • Defective adjustment of fan belt tension • (Check, repair loose terminals, disconnections) • Adjust fan belt tension For details, see “EVERY 250 HOURS SERVICE” Lamp flickers while engine is running Charge level monitor does not go out even when engine is running • Defective alternator • Defective wiring (• Replace) (• Check, repair) Abnormal noise is generated from alternator • Defective alternator (• Replace) Starting motor does not turn when starting switch is turned to ON.
• Defective wiring • Insufficient battery charge (• Check, repair) • Charge 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 Pre-heating monitor does not light • Defective wiring • Defective heater relay • Defective monitor (• Check, repair) (• Replace) (• Replace) Oil pressure monitor does not light up when engine is stopped (starting switch at ON position) • Defective monitor • Defective caution lamp switch (•Replace) (•Replace) Outside of electrical heater is not warm when touched by hand • Defective wiring • Disconnection in electric heater • Defective operation of heater switch (• Check, repair) (• Replace) (• Replace)