Fault Phenomenon: Manitou 180ATJ articulating boom aerial work platform while driving, the transmission automatically jumps from high gear back to neutral.

Troubleshooting Process:
– Checked transmission fluid level: level normal.
– Checked shift solenoid valves: valves stuck.
– Checked transmission internals: gear shift fork worn.
– Checked control software: software logic error.

Root Cause: The transmission internal shift fork is worn, causing unstable gear meshing.

Required Parts: Transmission repair kit or assembly.