Case IH 1955-12 - UCM – UCM: Rear pilot head #4 reporting internal controller fault

The electronic pilot head (the transducer/actuator mounted on top of the hydraulic remote valve) on the #4 rear Electro-Hydraulic Remote (EHR) has suffered an internal electrical or microprocessor failure. When this occurs, the remote valve will typically fail to operate, throw a 'position transducer faulty' error, or cause the EHR system to act intermittently.

• MAGNUM AFS Connect
• Steiger 350
• Steiger 400
• Steiger 420
• Steiger 450
• Steiger 470
• Steiger 500
• Steiger 580
• Quadtrac 350
• Quadtrac 400
• Quadtrac 420
• Quadtrac 450
• Quadtrac 470
• Quadtrac 500
• Quadtrac 580
• Magnum 210
• Magnum 250
• Magnum 280
• Magnum 300
• Magnum 340
• Magnum 380
• Magnum 400
• Puma 180
• Puma 185
• Puma 200
• Puma 220
• Puma 240
• Puma 260
• Optum 270
• Optum 300

1. 1

   Connect the Case IH Electronic Service Tool (EST) to confirm the 1955.12 code is active and isolated to remote #4.

2. 2

   Inspect the CAN bus wiring harness and the electrical connector at the #4 pilot head for corrosion, moisture, or loose pins.

3. 3

   Ensure the issue is actually the pilot head and not a worn or sticking mechanical spool inside the main valve body, or incorrect base hydraulic pressure.

1. 1

   Removal

   Clean the area around the #4 rear remote valve to prevent dirt from entering the hydraulic system. Unplug the electrical harness from the pilot head. Unbolt and remove the faulty pilot head from the top of the remote valve slice.

2. 2

   O-Rings

   Remove the old O-rings between the valve slice and the pilot head. Install new O-rings to prevent hydraulic leaks.

3. 3

   Installation

   Bolt the new pilot head assembly onto the valve slice and reconnect the electrical harness.

4. 4

   Reassign Valve Addresses

   Using the Case IH Electronic Service Tool (EST), you must reassign the valve addresses so the UCM knows which cab lever controls the newly installed #4 valve.

5. 5

   Calibration

   Perform the EHR calibration procedure using the EST. This tunes the valve for proper spool movement and ensures it functions correctly, especially for constant flow applications.