Fault Phenomenon: Dingli telescopic boom when operating the control handle, the action either does not move or moves at full speed, unable to perform fine control.

Troubleshooting Process:
– Checked handle potentiometer: potentiometer signal jumps.
– Checked proportional valve coil: coil resistance abnormal.
– Checked controller parameters: parameters lost.
– Replaced handle potentiometer, re-flashed controller parameters.

Root Cause: The control handle potentiometer wore out, causing loss of signal linearity.

Required Parts: Control handle assembly.