Excavator Komatsu PC160-7 PC160-8 PC180-7 Main Control Valve Assembly 723-57-16100 723-57-16103 723-56-16101
Common Faults & Symptoms
- 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 pressure retention
- Spool sticking, no response of corresponding function
- Worn overload relief valve, low system pressure
- Damaged check valve, abnormal return of operation
- Scuffed valve bore, continuously increasing internal leakage
- Unstable pilot control pressure, erratic movement speed
- Aging and failure of seals, multiple oil leaks