Komatsu PC130-8 Hydraulic Main Control Valve Part Numbers: 723-57-12700, 723-57-12701, 723-57-12702, 723-57-12703 Common Faults 723-57-12700 723-57-12701 723-57-12702 723-57-12703 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