4723874 Original Excavator Joystick Pilot Valve for ZX220W-7

Part number 4723874 is a genuine joystick pilot valve produced by Hitachi Construction Machinery Co., Ltd. in Japan. Its universal model usually covers ZX220W-7 same platform models, and may also be applicable to W-7 series wheeled excavators such as ZX210W-7 and ZX240W-7 that use the same handle assembly. As an original precision hydraulic control unit, its interface size, flow characteristics, and mechanical structure of the handle are precisely matched with the vehicle's pilot hydraulic circuit

This product is a direct acting or pilot operated precision hydraulic valve, with a silver gray high-strength alloy valve body and multiple copper oil ports on the top for connecting pilot oil pipes. One side is equipped with a black adjustment knob for fine-tuning the spool stroke or pressure. Its core function is to linearly convert the small mechanical displacement of the operating handle into proportional pilot hydraulic oil output, thereby accurately controlling the opening of the main control valve core. The "CBCJFBF" on the label is the production batch number. The working pressure is usually matched with a pilot system (3-5 MPa), with sensitive response and extremely low leakage. High protection level, able to adapt to the possible humidity and vibration environment inside the handle. Its materials and craftsmanship ensure long-term stability and durability.

Installation specifications: 1 Safety preparation: Before operation, be sure to turn off the engine and operate all handles to release residual pressure in the hydraulic system. 2. Clean the connection: Clean the valve body oil port and installation surface with a lint free cloth, replace all O-rings, and apply clean hydraulic oil to the new sealing rings. 3. Alignment tightening: Align the valve body with the installation hole, use a torque wrench to tighten the fixing bolts diagonally to the specified torque (usually 10-15 N · m), avoiding unilateral force. 4. Exhaust and testing: After connecting the oil pipe, start the engine and run it at idle speed. Slowly and repeatedly operate the corresponding handle throughout the full stroke to exhaust the air inside the valve. Then check for any leaks in each interface and test the operating feel.