Product Introduction:

The W-07-00801 is a lift cylinder control valve used in the Sinomach 732T motor grader. It is part of the working hydraulic system that controls the raising and lowering of the moldboard (blade).

1. Installation Location
This valve is installed in the grader's working hydraulic circuit, typically mounted within the main valve block or as a separate section in the hydraulic control manifold. It is connected to the left and right blade lift cylinders. The 732T uses a load-sensing hydraulic system with a working pressure of 25 MPa .

2. Function
The valve controls hydraulic oil flow to the blade lift cylinders, enabling the operator to raise, lower, and hold the moldboard at the desired height. The 732T is equipped with a working cushion device in the lift cylinder piping; if the blade suddenly collides with an obstacle, excessive pressure in the hydraulic system forces the cylinder to lift the blade, preventing damage to components . The valve works in conjunction with the load-sensing system to match hydraulic output to operating demand .

3. Maintenance and Service
Regular inspection includes checking for external leakage at the valve ports, verifying smooth spool movement, and ensuring electrical connections (if equipped with solenoid control) are secure. If the blade fails to hold position, drifts, or responds slowly, the valve may require inspection. Internal repairs should be performed by qualified hydraulic technicians under clean conditions. The valve assembly is not user-serviceable internally; replacement with an identical unit is recommended if a fault is confirmed.

4. Important Notes
Always verify the part number W-07-00801 matches the original specification before installation. Depressurize the hydraulic system before servicing. After installation, test the blade lift function through its full range of motion to confirm proper operation. Use only hydraulic fluid meeting the manufacturer's specifications.