209-26-00040 209-26-00042 Swing Reduction Gear Assembly for Komatsu PC750-7 PC800-8 PC850-8 Hydraulic Excavators
Common Faults
- Insufficient swing output torque, weak swing performance, difficult slewing under heavy load
- Abnormal noise during slewing, vibration of reducer housing
- Oil leakage of reducer, damaged oil seals and gaskets
- Wear of internal gears and bearings, excessive operating temperature
- Excessive swing clearance, slewing wobble
- Failure of swing brake, upper structure drifts after shutdown
Purchasing Recommendations
- Verify part numbers 209-26-00040, 209-26-00042 and machine serial number to confirm compatibility with Komatsu PC750, PC800-8, PC850-8 hydraulic excavators
- Prioritize OEM parts or high-quality remanufactured parts; be cautious of low-cost generic spare parts
- Inspect reducer housing for cracks, check integrity of port threads, flange and gear output end before acceptance
- Confirm the swing reduction gear 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 during replacement to prevent secondary wear of gears and bearings caused by contaminants