723-47-26102 723-47-26103 723-47-26104 723-47-26105 Hydraulic Main Control Valve For PC300-7 PC350-7 PC360-7 Excavators

Part Numbers 723-47-26102, 723-47-26103, 723-47-26104, 723-47-26105 - Hydraulic Main Control Valve / Main Valve Assembly for PC300-7, PC350-7, PC360-7, and other -7 series excavators.

• 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 plate and plunger, excessive operating temperature
• Loss of swing holding pressure, upper structure slewing drift after shutdown

• Verify part numbers and machine serial number to confirm compatibility with Komatsu hydraulic excavator
• Prioritize OEM parts or high-quality remanufactured parts; be cautious of low-cost generic spare parts
• Inspect motor housing for cracks, check integrity of port threads and output shaft before acceptance
• Confirm the swing motor assembly comes with a complete seal kit for easy installation and replacement
• Request warranty from supplier and retain factory inspection report
• Check hydraulic oil condition and clean hydraulic circuit to eliminate system contamination during assembly replacement