TROUBLES AND ACTIONS OPERATION Engine 0. ( ): 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.
3-104 Problem Main causes Remedy Engine oil pressure monitor lights up • Oil level low in oil pan (sucking air in) • Clogged oil filter cartridge • Defective tightening of oil pipe, pipe joint, oil leakage from damaged point • Defective engine oil pressure sensor • Add oil to specified level, see CHECK BEFORE STARTING • Replace cartridge, see EVERY 500 HOURS SERVICE (• Check, repair) (• Replace sensor) Steam spurts out from top of radiator (pressure valve) • Cooling water 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 opera- tions) • Defective water level sensor • Check, add water, repair, see CHECK BEFORE STARTING • Adjust fan belt tension, see EVERY 250 HOURS SERVICE • Change coolant, flush inside of cooling system, see WHEN REQUIRED • Clean or repair, see EVERY 500 HOURS SERVICE (• Replace thermostat) • Tightening cap or replace packing (• Replace sensor) Red range of engine water tempera- ture gauge lights up White range of engine water tempera- ture gauge is lights up even after operating for long time •Defective thermostat (• Replace thermostat) Engine dose not start when starting motor is turned • Lack of fuel • Air in fuel system • •Water in fuel system • •Defective fuel injection pump or defective nozzle • Starting motor cranks engine sluggishly • Preheating monitor dose not light up • Defective compression • Defective valve clearance • Add fuel, see CHECK BEFORE STARTING • Repair place where air is sucked in, see EVERY 500 HOURS SERVICE • Drain water.
For details, see WHEN REQUIRED and CHECK BEFORE STARTING (• Replace pump or nozzle) • See ELECTRICAL SYSTEM • See ELECTRICAL SYSTEM (• Adjust valve clearance) Exhaust gas is while or blue • Too mach oil in oil pan • Improper fuel • Set oil to specified level, see CHECK BEFORE STARTING • Change to specified fuel Exhaust gas sometimes becomes black •Clogged air cleaner element •Defective nozzle •Defective compression • Clean or replace, see WHEN REQUIRED (• Replace nozzle) (• See "Defective compression") Combustion noise occasionally make breathing sound • Defective nozzle (• Replace nozzle) Abnormal noise generated (combustion or mechanical) • Low grade fuel being used • Overheating • Damage inside muffler • Excessive valve clearance • Change to specified fuel • See "Red range of engine water temperature gauge lights up" • Replace muffler (• Adjust valve clearance)