Fault Phenomenon: Stemco bridge inspection vehicle work platform when the boom luffs, it cannot maintain level, excessive tilt angle.

Troubleshooting Process:
– Checked leveling cylinder: cylinder internal leakage.
– Checked tilt sensor: zero-point offset.
– Checked leveling valve block: valve block clogged.
– Recalibrated sensor, cleaned valve block.

Root Cause: Zero-point drift of the tilt sensor caused control logic errors.

Required Parts: Tilt sensor.