16. TROUBLESHOOTING 16.6.3 ENGINE ( ): 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 2-96 Problem Engine oil pressure monitor lights up Steam is emitted from top part of radiator (pressure valve) Radiator water level monitor lights up Engine does not start when starting motor is turned Main causes Remedy • Engine oil pan oil level is low (sucking in air) • Clogged oil filter cartridge • Defective tightening of oil pipe joint, oil leakage from damaged part • Defective engine oil pressure sensor • Add oil to specified level, see “CHECK BEFORE STARTING” • Replace cartridge, see “EVERY 250 HOURS SERVICE” (• Check, repair) (• Replace sensor) • Cooling water level low, water leakage • Loose fan belt • Dirt or scale accumulated in cooling system • Add cooling water, repair, see “CHECK BE- FORE STARTING” • Adjust fan belt tension, see “EVERY 250 HOURS SERVICE” • Change cooling water, clean inside of cooling system, see “WHEN RE- QUIRED” • Clogged radiator fin or damaged fin • Defective thermostat • Loose radiator filler cap (high altitude op- eration) • Defective water level sensor • Clean or repair, see “EVERY 500 HOURS SERVICE” (• Replace thermostat) • Tighten cap or replace packing (• Replace sensor) • Lack of fuel • Air in fuel system • Defective fuel injection pump or nozzle • Starting motor cranks engine sluggishly • Preheating monitor does not light up • Defective compression • Defective valve clearance • Contaminated fuel • Lift pump not working • Fuel filter clogged • Fuel lines blocked • Add fuel, see CHECK “BEFORE STARTING” • Repair place where air is sucked in, see “EVERY 250 HOURS SERVICE” (• Replace pump or nozzle) See ELECTRICAL SYSTEM (• Adjust valve clearance) • Drain & clean fuel system • Check/replace pump • Change filters • Check/blow out lines