. OPERATION TROUBLES AND ACTIONS 3 - 139 Engine ( ) : Always contact your Komatsu distributor when dealing with these items. In cases of problem 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 SERVICR ( Check, repair) ( Replace) Steam spurts out from top of Coolant level low, leakage of Check, add coolant, repair, see water Loose fan belt Dirt scale accumulated in cooling system Red range of engine coolant temperature gauge lights up Clogging radiator fins or damages fins Defective thermostat Loose radiator filler cap (high altitude operations) Defective water level sensor REQUIRED Clean or repair, see EVERY 500 HOURS SERVICE ( Replace thermostat) Tightening cap or replace packing ( Replace sensor) White range of engine coolant temperature gauge in light up even after operating for long time ( Replace thermostat) Engine dose not start when starting motor is turned Add fuel, see CHECK BEFORE STARTING Repair place where air in 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 in specified level, see CHECK BEFORE STARTING Change to specified fuel Avoid rapid acceleration until after the engine warming-up Exhaust gas sometimes becomes black Clean or replace, see WHEN REQUIRED ( Replace nozzle) ( See "Defective compression") Combustion noise occasionally make breathing sound ( Replace nozzle)