Case IH 1979-09 - UCM – UCM: Rear pilot head #6 unexpected reset

This fault code indicates that the electronic pilot head (the valve driver/actuator) controlling the #6 Rear Selective Control Valve (SCV / Remote Valve) has experienced an unexpected reboot or reset.

• MAGNUM AFS Connect
• Steiger
• Puma

1. 1

   Cycle power and attempt to run an EHR (Electro-Hydraulic Remote) valve calibration via the Pro 1200 display to rule out a temporary software glitch.

2. 2

   Inspect the wiring harness leading to the #6 rear remote valve for rubbed wires, loose connector pins, or moisture/corrosion inside the plug.

3. 3

   Verify the pilot head is receiving a steady 12V power supply and has a clean ground.

4. 4

   Perform a swap test by exchanging the electronic pilot head from SCV #6 with a known good pilot head from an adjacent valve (e.g., SCV #5) to determine if the fault follows the pilot head or remains on the tractor's wiring/UCM.

1. 1

   Depressurize the System

   Turn off the tractor and cycle the remote levers/buttons to relieve any residual hydraulic pressure in the SCV stack.

2. 2

   Disconnect Electronics

   Unplug the electrical harness connector from the #6 SCV pilot head.

3. 3

   Remove the Pilot Head

   Remove the mounting bolts securing the pilot head to the main hydraulic valve body. Carefully pull the pilot head away.

4. 4

   Prep the Surface

   Clean the mating surface on the valve body. Inspect the spool for any binding or scoring.

5. 5

   Install the New Pilot Head

   Install the replacement pilot head, ensuring that the O-rings/seals are properly seated to prevent oil seepage. Torque the mounting bolts to OEM specifications.

6. 6

   Reconnect & Calibrate

   Plug the electrical connector back in. Start the tractor, warm up the hydraulic oil, and perform a mandatory SCV calibration through the cab display so the UCM can learn the new valve driver's neutral, extend, and retract limits.