Excavator Komatsu PC800-5 PC850-8 Swing Motor Assembly Part Numbers 706-7G-01031 706-7G-01030
Common Faults
- Insufficient swing torque, weak swing performance, difficult slewing under heavy load
- Unstable swing speed, jerky swing motion and heavy shock during start & stop
- Abnormal noise of swing motor with housing vibration
- Oil leakage on motor housing, damaged oil seals and gaskets
- Wear of internal valve plate and plunger, excessive operating temperature
- Loss of swing holding pressure, upper structure slewing drift after shutdown
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 motor housing for cracks, check integrity of port threads and output shaft before acceptance
- Confirm the swing motor assembly comes with a complete seal kit for easy installation and replacement
- Request warranty from supplier and retain factory inspection report
- Check hydraulic oil condition and clean hydraulic circuit to eliminate system contamination during assembly replacement