Fault Phenomenon: SANY SAP90C paver when using a leveling beam, the screed vibrates up and down frequently.

Troubleshooting Process:
– Checked leveling beam: beam deformed or connections loose.
– Checked sensor: sensor cable poor contact.
– Checked ground: reference surface too rough.
– Checked filtering: system damping parameters set too small.

Root Cause: The automatic leveling sensor cable connector is oxidized and loose, causing intermittent signal loss or jitter, leading to false corrections.

Required Parts: Repair or replace sensor cable and connector.