Fault Phenomenon: Manitou 130ETJ telescopic boom aerial work platform while driving, the motor jitters, speed uncontrolled.

Troubleshooting Process:
– Checked encoder wiring: wiring open circuit.
– Checked encoder disc: disc dirty.
– Checked connector: connector loose.
– Checked controller: controller reading error.

Root Cause: The drive motor encoder signal is lost or has interference.

Required Parts: Motor encoder assembly.