The hydraulic system presents working equipment, walking, reversing

1. The PC valve is poorly adjusted.

2. Defective LS valve assembly.

3. The PC valve assembly is damaged.

4. The hydraulic components of the output circuit of the pressure reducing valve are defective

5. The plunger pump is defective.

6. The servo piston of the plunger pump is defective.

7. The main relief valve is not adjusted correctly.

8. The unloading valve does not operate properly.

9. The main relief valve is damaged.

[Solution] Through fault analysis, the following solutions are obtained:

1. Adjust or repair pc valve

2. View and repair the LS valve

3. Overhaul the PC valve

4. Repair the hydraulic components of the output circuit of the pressure reducing valve or replace the hydraulic components of the output circuit of the pressure reducing valve

5. Overhaul the plunger pump

6. Repair or replace the piston pump servo piston

7. Readjust the main relief valve

8. Adjust or repair the unloading valve

9. Overhaul the main relief valve