Fault Phenomenon: SANY SR360 rotary drilling rig instrument displays low hydraulic oil level alarm, but the actual level is normal.

Troubleshooting Process:
– Checked sensor: float stuck in low position.
– Checked wiring: wiring shorted to ground.
– Checked oil quality: sludge adhering to float.
– Checked instrument: display module faulty.

Root Cause: The hydraulic tank level sensor float is stuck due to sludge adhesion, unable to rise with the oil level, sending a false signal.

Required Parts: Clean or replace level sensor.