Fault Phenomenon: Bronto fire truck aerial ladder platform during extension/retraction, a sharp grinding sound occurs and it jams.

Troubleshooting Process:
– Checked wear pads: pads worn and detached.
– Checked guide rails: rails deformed.
– Checked lubrication: grease dried out.
– Replaced wear pads, straightened rails, re-greased.

Root Cause: The telescopic guide wear pads wore off and detached, causing direct metal-to-metal friction.

Required Parts: Guide wear pad set, specialized grease.