OPERATION TROUBLES AND ACTIONS OTHER TROUBLE 3 Electrical System 3 q ( ): Always contact your Komatsu distributor when dealing with these items. q In cases of abnormalities or causes which are not listed below, contact your Komatsu distributor for repairs.
3-129 Problem Main causes Remedy Lamp does not glow brightly even when the engine runs at high speed •Defective wiring, deterioraion of battery •Loose fan belt (•Check, repair loose terminals, disconnections, replace battery) Lamp flickers while engine is run- ning •Check fan belt tension, replace Charge level monitor does not go out even when engine is running •Defective alternator •Defectivr 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 •Defective starting motor •Insufficient battery charge (•Check, repair) (•Replace) •Charge Pinion of starting motor keeps going and out •Insufficient battery charge •Defective safety relay •Charge (•Replace) Starting motor turns engine slug- gishly •Insufficient battery charge •Defective starting motor •Charge (•Replace) Starting motor disengages before engine starts •Defective wiring, defective ring gear pinion •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 relay switch (•Check, repair) (•Replace) (•Replace)