Fault Phenomenon: Ruthmann truck crane during operation, the hydraulic tank suddenly collapses, the pump makes a loud noise.

Troubleshooting Process:
– Checked tank cap breather: breather frozen or clogged with debris.
– Checked return filter: filter severely clogged.
– Cleared breather, replaced return filter.

Root Cause: The tank breather was clogged, creating a vacuum inside the tank.

Required Parts: Return filter, breather cap.