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.