TROUBLESHOOTING *) These measures must be performed by your local Komatsu dealer. 6-5 ENGINE (CONTINUED) FAULT CAUSES REMEDY Temperature display coolant: tempera- ture display coolant in red zone, top LED is flashing, acoustic alarm is given Engine has run too hot Let engine run idle without load until it has cooled down sufficiently and the coolant temperature indicator is within the green range.
Tension of fan's drive belt too low Tension drive belt Internal surface of engine cooling sys- tem furred or dirty *) Clean internal surface of engine cooling system Radiator (radiator surfaces, fins) dirty Clean radiator (radiator surfaces, fins) Thermostat without function *) Check function of thermostat; replace defective thermostat Radiator cap either defective or loose Replace defective radiator cap; re- tighten loose radiator cap Coolant temperature indicator:
with the engine at operating temperature, the temperature display coolant does not indicate a temperature Temperature indicator without function *) Check function of temperature indi- cator; replace defective temperature indicator Engine does not start up Fuel tank empty Refill fuel and bleed fuel system Air in fuel system Bleed fuel system Injection pump or injection nozzles without function *) Replace injection pump or injection nozzles Starting speed too low See "Electrical System" Engine compression too low *) Check tappet clearance Exhaust fume colour white or blue Oil level in engine too high Correct oil level Wrong fuel Use prescribed fuel Exhaust fume colour temporarily black Air filter insert dirty Clean or replace air filter insert Injection nozzle defective *) Replace injection nozzles Engine compression too low *) Check tappet clearance