Wheel Loader Komatsu WA380-6 WA430-6 WA450-6 WA470-6 WA480-6 Loader Fan Hydraulic Pump - 708-1S-00940 708-1S-00970
Common Faults
- Insufficient output flow of fan pump, low fan speed and engine overheating
- Low pressure of auxiliary pump, slow response of pilot control
- Abnormal noise during pump operation with housing vibration
- Oil leakage at pump mating surface and shaft end, damaged oil seals and gaskets
- Wear of internal gears and flow distribution components, pump overheating
- Severe pressure fluctuation, unstable fan speed
Purchasing Recommendations
- Verify part numbers and machine serial number to confirm compatibility with Komatsu hydraulic excavator
- Prioritize OEM parts or high-quality remanufactured parts; be cautious of low-cost generic spare parts
- Inspect pump housing for cracks, check integrity of port threads, input shaft and solenoid valve before acceptance
- Confirm the fan pump & auxiliary pump assembly comes with a complete seal kit for easy installation and replacement
- Request warranty from supplier and retain factory inspection report
- Replace hydraulic oil and clean hydraulic circuit during assembly replacement to prevent secondary wear caused by contaminants