main control valve on Komatsu PC1250-7 PC1250-8 excavators are 709-15-94000 709-15-94001

709-15-94000, 709-15-94001

• 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, fluctuating system pressure and jerky operation
• Relief valve malfunction, system pressure fails to build up or rises abnormally high

• Verify part numbers and machine serial number to confirm compatibility with Komatsu PC850 hydraulic excavator
• Prioritize OEM parts or high-quality remanufactured parts; be cautious of low-cost generic spare parts
• Inspect valve body for cracks, check integrity of port threads and mounting flange before acceptance
• Confirm the main control valve assembly comes with a complete seal kit for easy installation and replacement
• Request warranty from supplier and retain factory inspection report
• Clean hydraulic tank, replace hydraulic oil and flush pipeline contaminants during valve replacement to prevent secondary wear