Fault Phenomenon: Palazzani aerial work platform after turning off the key, the diesel engine continues to run, cannot stop.

Troubleshooting Process:
– Checked stop solenoid: valve spool stuck in open position.
– Checked wiring: wiring normally closed.
– Checked key switch: switch failed.
– Checked mechanical cable: cable stuck.

Root Cause: The diesel engine stop solenoid is stuck, preventing fuel cutoff.

Required Parts: Stop solenoid assembly.