To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.
Visually check to ensure the pump is moving. If not, ensure the motor is wired properly.
If motor is moving but pump is not and pressure is not building, the hydraulic power pack may need servicing.
Check to ensure the linear position sensor is properly connected to the MCM and the wiring has not been damaged.
Replace the linear position sensor.
Reset coupler per specifications and re-tighten set screws.
Re-tighten or replace supply tube.
Verify that no outside forces are stopping the pump from moving, then inspect over-pressure valve for damage or debris.