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.
2-106 Problem Main causes Remedy Engine oil pressure monitor lights up ‡ 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 ‡ Defective monitor ‡ Add oil to specified level, see CHECK BEFORE STARTING ‡ Replace cartridge, see EVERY 250 HOURS SERVICE (‡ Check, repair) (‡ Replace sensor) (‡ Replace monitor) Steam is emitted from top part of radiator (pressure valve) ‡ Cooling water level low, water leakage ‡ Loosen fan belt ‡ Dirt or scale accumulated in cooling system ‡ Clogged radiator fin or damaged fin ‡ Defective thermostat ‡ Loose radiator filler cap (high altitude operation) ‡ Defective water level sensor ‡ Defective monitor ‡ Add cooling water, repair, see CHECK BEFORE STARTING ‡ Adjust fan belt tension, see EVERY 250 HOURS SERVICE ‡ Change cooling water, clean 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 water level monitor lights up Engine does not start when starting motor is turned ‡ 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 fi Defective valve clearance ‡ 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 (fi Adjust valve clearance)