Hitachi excavator accessory 9246436 pilot valve sleeve (copper sleeve+oil seal)

9246436 is a key worn component on the Hitachi excavator pilot valve - the valve sleeve assembly (Sleeve ASSY). It is installed inside the pilot valve (control lever pilot valve), mainly playing the role of supporting, guiding, and sealing the pilot valve core (push rod), ensuring precise transmission of pilot oil pressure, and making the actions of the boom, forearm, and rotation sensitive and smooth. After long-term use, the valve sleeve is prone to wear, scratches, or seal failure, resulting in unstable pilot pressure, slow action, soft control lever, or increased internal leakage. Replacing the original or high-quality valve sleeve can effectively restore the performance of the pilot system.