Komatsu PC200-7 PC210-7 PC220-7 PC240-7 Main Control Valve Assembly Part Numbers: 723-47-20404, 723-46-20401, 723-46-20400 Common Operational Faults Slow and weak machine movements Weak operation of single actuator (boom / arm / bucket / swing / travel) Jerky and vibrating movement Interference during combined operation, poor flow merging External leakage of main control valve, oil seepage and oil leakage on valve body Severe internal leakage, rapid pressure drop and poor