16. TROUBLESHOOTING 16.4.4 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. If “02” or “04” is displayed, stop the machine at a safe place and apply the parking brake. After checking the service code, contact your Komatsu distributor for repairs. 2-116 Problem Main causes Remedy Engine oil pressure monitor lights up ‡ Insufficient oil in oil pan ‡ Clogged oil filter cartridge ‡ Oil leakage due to damage caused by defective tightening of oil pan, pipe joint ‡ Disconnection, broken wiring to sensor ‡ Add oil to specified level.
See CHECK BEFORE STARTING. ‡ Replace cartridge, see EVERY 250 HOURS SERVICE (‡ Check, repair) (‡ Repair, connect wiring) Steam spurts out from top of radia- tor (pressure valve) ‡ Insufficient coolant, water leak- age ‡ Loose fan belt ‡ Dirt or scale accumulated in cool- ing system ‡ Radiator fins clogged or dam- aged ‡ Defective water temperature gauge ‡ Defective thermostat ‡ Defective thermostat seal ‡ Loose radiator filler cap (opera- tions at high altitude) ‡ Disconnection, broken wiring to sensor ‡ Check, add cooling water. See CHECK BEFORE STARTING. ‡ Replace belt. See EVERY 500 HOURS SERVICE. ‡ Change coolant, clean inside of cooling system. See WHEN RE- QUIRED. ‡ Clean or repair.
See EVERY 500 HOURS SERVICE. (‡ Replace water temperature gauge) (‡ Replace thermostat) (‡ Replace thermostat seal) ‡ Tighten or replace cap.
(‡ Repair, connect wiring) Radiator cooling water level monitor lights up Water temperature gauge is in red range Engine water temperature monitor flashes Water temperature gauge display stays at lowest level and does not rise ‡ Defective water temperature gauge monitor ‡ Defective thermostat ‡ In cold weather, cold wind is blowing strongly against engine (‡ Replace water temperature gauge monitor) ‡ Replace thermostat (‡ Install radiator curtain) Engine does not start even when starting motor is cranked ‡ Insufficient fuel ‡ Air in fuel system ‡ No fuel in fuel filter ‡ Starting motor cranks engine too slowly ‡ Starting motor does not turn ‡ Defective valve clearance (defec- tive compression) ‡ Add fuel.
See CHECK BEFORE STARTING. (‡ Repair place where air is leak- ing in) ‡ Fill filter with fuel. See EVERY 500 HOURS SERVICE. See electrical components (‡ Adjust valve clearance)