Fault Phenomenon: SANY SW936 wheel loader when operating one action, another unrelated action drifts slightly or is weak.

Troubleshooting Process:
– Checked multi-way valve: O-rings between sections aged or valve body porosity.
– Checked spools: spools worn, excessive clearance.
– Checked pressure: unstable system pressure.
– Checked oil quality: contaminated fluid.

Root Cause: The high-pressure seal rings between the multi-way valve sections aged and failed, allowing high-pressure oil to cross into other sections.

Required Parts: Replace multi-way valve section seals or repair valve body.