. OPERATION TROUBLES AND ACTIONS 3 - 141 Engine ( ) : Always contact your Komatsu distributor when dealing with these items. In cases of problems or causes which are not listed below, contact your Komatsu distributor for repairs.
Problem Main causes Remedy Engine oil pressure monitor lights up Add oil to specified level, see CHECK BEFORE STARTING Replace cartridge, see EVERY 500 HOURS SERVICE ( Check, repair) ( Replace sensor) ( Replace monitor) Steam spurts out from top of radiator (pressure valve) Coolant level low, leakage of water Loose fan belt Dirt or scale accumulated in cooling system Clogged radiator fins or damaged fins Defective thermostat Loose radiator filler cap (high-altitude operations) Defective water level sensor Defective monitor Check, add coolant, repair, see CHECK BEFORE STARTING Check fan belt tension, adjust, replace Change coolant, flush inside of cooling system, see WHEN REQUIRED Clean or repair, see EVERY 500 HOURS SERVICE ( Replace thermostat) Tighten cap or replace packing ( Replace sensor) ( Replace monitor) Radiator coolant level monitor lights up Engine does not start when starting motor is turned Add fuel, see CHECK BEFORE STARTING Repair place where air is sucked in, see EVERY 500 HOURS SERVICE ( Replace pump or nozzle) See ELECTRICAL SYSTEM See ELECTRICAL SYSTEM ( Adjust valve clearance) Exhaust gas is white or blue Set oil to specified level, see CHECK BEFORE STARTING Change to specified fuel Exhaust gas occasionally turns black Clean or replace, see WHEN REQUIRED ( Replace nozzle) ( See defective compression above) Clean or replace turbocharger Combustion noise occasionally make breathing sound ( Replace nozzle)