1.Installation Precautions
System Cleanliness: Flush the entire hydraulic circuit and replace the oil before installation; even microscopic contaminants can cause spool seizure.
Accurate Hose Labeling: Strictly label all hydraulic lines to prevent incorrect connections, which can lead to operational logic errors.
Torque & Sealing: Tighten mounting bolts symmetrically to specified torque to avoid housing deformation. Always replace O-rings with new ones and apply a light coat of hydraulic oil.
2.Troubleshooting Solutions
Slow or Weak Response: Prioritize inspecting the Main Relief Valve pressure settings and verifying if the pilot control pressure meets OEM specifications.
Hydraulic Drift (e.g., Boom Dropping): This usually indicates internal leakage due to worn spools/bores or a faulty Overload Valve.
Spool Seizure/Sticking: Typically caused by contamination or a broken return spring; requires a full cleaning of the valve block and oil quality analysis.
External Leakage: Inspect seals for aging and check return line backpressure, as excessive pressure can compromise the spool oil seals.
