Fault Phenomenon: Manitou 160ETJ telescopic boom aerial work platform after power is turned off, the hydraulic pump still runs.

Troubleshooting Process:
– Checked contactor: main contacts welded.
– Checked control wiring: wiring shorted.
– Checked button: button stuck.
– Checked controller: controller output normally closed.

Root Cause: The hydraulic pump main contactor contacts welded due to high current.

Required Parts: Main contactor assembly.