Fault Phenomenon: Haulotte HA32RTJ PRO articulating boom aerial work platform when rotating, a loud metallic grinding sound comes from inside the turntable.

Troubleshooting Process:
– Checked swing bearing: ring gear missing teeth or balls broken.
– Checked swing gearbox: gears damaged.
– Checked lubrication: lubricating grease dried out.
– Checked for foreign objects: debris entered the ring gear.

Root Cause: The swing bearing raceway balls are broken or the ring gear is severely worn.

Required Parts: Swing bearing assembly.