Fault Phenomenon: Potain Igo self-erecting tower crane during self-erection, the hydraulic pump station emits a piercing noise.

Troubleshooting Process:
– Checked oil level: level too low.
– Checked suction strainer: strainer damaged.
– Checked pump coupling: coupling elastic element worn.
– Added oil, replaced strainer and elastic element.

Root Cause: The suction strainer was damaged, allowing debris to enter the pump, combined with coupling wear.

Required Parts: Suction strainer, coupling elastic element.