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