Fault Phenomenon: Dingli GTBZ40 telescopic boom aerial work platform during lifting, the cylinder piston rod is bent, unable to extend/retract.

Troubleshooting Process:
– Checked load: severe off-center loading.
– Checked impact: collision damage.
– Checked material: low material strength.
– Checked guidance: guidance failed.

Root Cause: Severe off-center loading or collision caused the piston rod to bend.

Required Parts: Cylinder piston rod straightening or replacement.