Case IH 1955-09 - UCM – UCM: Rear pilot head #4 unexpected reset

The internal electronics of the #4 rear remote pilot head have experienced a sudden reboot, loss of power, or loss of communication with the tractor's main controller.

• MAGNUM AFS Connect
• Magnum AFS Connect series
• Steiger / Quadtrac series (350, 370, 400, 420, 450, 470, 500)
• Puma series (185, 200, 220, 240 CVT)
• Optum series (270, 300)

1. 1

   Verify if the fault code is active, which generally points to an internal failure of the #4 pilot head itself requiring replacement.

1. 1

   Relieve hydraulic pressure

   Before performing any hydraulic repairs, you MUST relieve all pressure in the hydraulic system before disconnecting any lines or components to prevent severe fluid injection injuries.

2. 2

   Disconnect electrical harness

   Disconnect the electrical harness from the #4 rear pilot head.

3. 3

   Remove faulty pilot head

   Unbolt and remove the faulty pilot head assembly from the hydraulic remote valve body.

4. 4

   Install replacement pilot head

   Install the replacement pilot head assembly.

5. 5

   Verify connections

   Before applying pressure to the circuit, verify that all connections are tight and that the components are in good condition.

6. 6

   Calibrate pilot head

   After replacement, the new pilot head will likely require calibration via the tractor's control panel or the Case IH EST (Electronic Service Tool) to ensure proper spool travel and communication with the UCM.