Main hydraulic control valve pilot valve Part Nos. 723-36-10300 723-36-10105 723-36-10101 for PC120-6 PC110-6 PC100-6 PC130-6

Pilot valve assembly for main hydraulic control valves designed for Komatsu hydraulic excavators. Ensures precise control and reliable performance in demanding operating conditions.

• 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