Fault Phenomenon: Genie IWP-20S vertical mast aerial work platform when rising halfway, suddenly gets stuck, unable to continue rising or descending.

Troubleshooting Process:
– Checked mast guide rails: rails deformed or have foreign objects.
– Checked rollers: roller shattered and stuck.
– Checked chains: chain jumped teeth or broken.
– Checked hydraulic lock: hydraulic lock stuck.

Root Cause: A mast guide roller shattered, and debris got stuck in the guide rail, causing mechanical seizure.

Required Parts: Guide roller assembly and rail cleaning.