Fault Phenomenon: Skyjack SJ9650 telescopic boom aerial work platform during rapid boom retraction, the hydraulic tank deforms and collapses.

Troubleshooting Process:
– Checked tank cap breather: breather clogged.
– Checked breather: breather frozen or dirty.
– Checked return filter: filter clogged causing high back pressure.
– Checked tank structure: insufficient structural strength.

Root Cause: The hydraulic tank breather is clogged, causing a vacuum inside during rapid oil return.

Required Parts: Tank breather cleaning or replacement.