Doosan DX22 - Causes of Faults and Troubleshooting

6. Cooling System
92
Causes of Faults and Troubleshooting
Symptom Possible Cause Troubleshooting
Overheated engine
Insufficient coolant Add coolant
Loose radiator cap spring Replace the cap
Loose or broken fan belt Adjust or replace the fan belt
Fan belt contaminated with oil Replace the fan belt
Malfunctioning thermostat Replace the thermostat
Faulty coolant pump Repair or replace
Resistance due to contamination of coolant
passage
Clean the radiator and coolant passage
Incorrect injection timing Adjust the injection timing
Contaminated or clogged radiator air passage Clean the outside of the radiator
Coolant leakage due to damaged cylinder
head gasket
Replace the cylinder head gasket
Overcooled engine
Malfunctioning thermostat Replace the thermostat
Excessively low ambient temperature Cover the radiator
Insufficient coolant
Coolant leaking from radiator Repair or replace
Loose or damaged radiator coolant connection Retighten the hose clamp or replace the hose
Loose radiator cap valve spring Replace the cap
Leaky coolant pump Repair or replace
Loose or damaged heater hose connection Tighten or replace the hose
Leaky cylinder head gasket Replace the cylinder head gasket
Cracked cylinder head or block Replace the cylinder head or block
Abnormal noise in cooling
system
Faulty coolant pump bearing Replace the bearing
Loose or bent cooling fan Retighten or replace the fan
Uneven rotation of cooling fan Replace the fan
Faulty fan belt Replace the fan belt