Fault Phenomenon: Zoomlion crawler crane after turning off the key switch, the engine continues to run, unable to stop.

Troubleshooting Process:
– Checked stop solenoid: solenoid stuck in the fuel supply position.
– Checked wiring: wiring shorted, constantly energized.
– Tapped the solenoid to reset it, later replaced the solenoid.

Root Cause: The engine stop solenoid was mechanically stuck, unable to cut off the fuel supply.

Required Parts: Stop solenoid.