. OPERATION TROUBLESHOOTING 3 - 153 ENGINE ( ) : Always contact your Komatsu distributor when dealing with these items. In cases of problems or causes which are not listed below, ask your Komatsu distributor for repairs. Problem Main causes Remedy Engine oil pressure caution lamp lights up Insufficient oil in oil pan Add oil to specified level. See CHECK BEFORE STARTING. Clogged oil filter cartridge Replace cartridge, see EVERY 500 HOURS SERVICE.
Oil leakage due to damage caused by defective tightening of oil pan, pipe joint ( Check, repair) Disconnection, broken wiring to sensor ( Repair, connect wiring) Steam spurts out from top of radiator (pressure valve) Drop in engine water level is displayed on the character display and the maintenance caution lamp lights up Coolant temperature gauge is in red range Engine coolant temperature caution lamp flashes Insufficient coolant, coolant leakage Check, add coolant. See CHECK BEFORE STARTING. Loose fan belt Replace belt. See EVERY 500 HOURS SERVICE. Dirt or scale accumulated in cooling system Change coolant, clean inside of cooling system. See WHEN REQUIRED.
Radiator fins clogged or damaged Clean or repair. See WHEN REQUIRED. Defective coolant temperature gauge ( Replace coolant temperature gauge) Defective thermostat ( Replace thermostat) Defective thermostat seal ( Replace thermostat seal) Loose radiator filler cap Tighten or replace cap.
Disconnection, broken wiring to sensor ( Repair, connect wiring) Coolant temperature gauge display stays at lowest level and does not rise Defective coolant temperature gauge ( Replace coolant temperature gauge) Defective thermostat ( Replace thermostat) In cold weather, cold wind is blowing strongly against engine ( Install radiator curtain) Engine does not start even when starting motor is turned Insufficient fuel Add fuel. See CHECK BEFORE STARTING.
Air in fuel system ( Repair place where air is leaking in) Starting motor cranks engine too slowly See electrical components Starting motor does not turn See electrical components Defective valve clearance (defective compression) ( Adjust valve clearance) Gear shift lever is not at N (neutral) position Set gear shift lever to N (neutral) position