Komatsu PC1250-7 & PC1250-8 Main Control Valve Part Numbers: 709-14-93500, 709-14-93501 Common Faults & Symptoms Insufficient flow of main control valve, weak machine performance and slow operation speed Spool sticking, single function failure and uncoordinated combined movements Internal leakage of valve block, insufficient pressure under load and speed drop during operation External oil leakage on valve body, aged and damaged seals and O-rings Wear of valve bore and spool,