Bulldozer Komatsu D61-15 D65-15 D65-16 D85-15 Bulldozer Fan Motor Auxiliary Motor Cooling (Radiator) Fan Motor 708-7L-00060 708-7L-00070
Common Faults & Troubleshooting
- Fan not rotating / abnormal speed: First determine whether the fault is in the pump or the motor—measure the fan motor inlet pressure/flow. If pressure is normal but the fan does not turn, it indicates internal motor wear; if pressure or flow is insufficient, check the fan pump, filter and oil circuit.
- Abnormal noise / squealing: Worn internal motor bearing, cavitation (air entrained in system), contaminated oil.
- Unstable fan speed / jitter: Abnormal electronic control signal, seized motor displacement mechanism, air in oil circuit.
- Oil leakage: Aged shaft oil seal, worn end-cover O-rings.
- High oil temperature chain reaction: Severe motor internal leakage generates heat, which in turn accelerates wear.
Repair & Purchasing Recommendations
- Light wear: Replace the oil seal + seal kit and clean the interior.
- Severe scoring (cylinder block, valve plate, piston): Replace the rotating group parts or the complete motor assembly.
- After reassembly: Always fill the pump/motor with hydraulic oil before starting; running it dry will burn out the motor.