Hydraulic Main Piston Pump Assembly - Part Numbers 708-2G-00320 & 708-2G-00620
Product Overview
Part numbers 708-2G-00320 and 708-2G-00620 are hydraulic main piston pump assemblies designed for Komatsu PC200-10, PC210-10, and PC210LC-10 excavators.
Common Faults & Issues
- Insufficient swing torque and weak swing performance
- Unstable swing speed with jerky motion and heavy shock during start/stop
- Abnormal noise from swing motor with housing vibration
- Oil leakage on motor housing from damaged seals and gaskets
- Wear of internal valve plate and plunger with excessive operating temperature
- Loss of swing holding pressure causing upper structure drift after shutdown
Purchasing Recommendations
- Verify part numbers and machine serial number for compatibility
- Prioritize OEM parts or high-quality remanufactured components
- Inspect motor housing for cracks and check port thread integrity
- Confirm assembly includes complete seal kit for installation
- Request warranty documentation and factory inspection reports
- Check hydraulic oil condition and clean hydraulic circuit during replacement