Case IH 1931-11 - UCM – UCM: Rear pilot head #2 reporting that the spool was not in neutral at power-on

A failure in the electronic pilot head valve assembly that controls the #2 rear hydraulic remote. When the tractor is powered on, the system expects the hydraulic spool to be in a neutral, centered position. If the pilot head detects that the spool is off-center (or if the pilot head's internal electronics have failed and are sending an erroneous signal), it will log a fault. Dealer technicians note that a shorted or failed pilot head can disrupt the CAN Bus network, causing other remote valves to go offline.

• MAGNUM AFS Connect
• Puma 185
• Puma 185CVT
• Puma 200
• Puma 220
• Puma 220CVT
• Puma 240CVT
• Optum 270
• Optum 300
• Steiger 350
• Steiger 370
• Steiger 400
• Steiger 420
• Steiger 450
• Steiger 470
• Steiger 500
• Steiger 580
• Quadtrac 350
• Quadtrac 370
• Quadtrac 400
• Quadtrac 420
• Quadtrac 450
• Quadtrac 470
• Quadtrac 500
• Quadtrac 580
• Magnum 210
• Magnum 280

1. 1

   Perform a CAN Bus Isolation Test by unplugging the electrical connector specifically at the #2 rear pilot head.

2. 2

   Cycle the tractor's power. If the rest of the remote valves come back online and function normally, the #2 pilot head is confirmed to be internally shorted/faulty and must be replaced.

1. 1

   Power down the tractor and relieve all hydraulic pressure from the rear remote valves.

   Power down the tractor and relieve all hydraulic pressure from the rear remote valves.

2. 2

   Disconnect the wiring harness from the #2 rear pilot head.

   Disconnect the wiring harness from the #2 rear pilot head.

3. 3

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

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

4. 4

   Install the new pilot head assembly and torque the mounting bolts to OEM specifications.

   Install the new pilot head assembly and torque the mounting bolts to OEM specifications.

5. 5

   Reconnect the wiring harness.

   Reconnect the wiring harness.

6. 6

   After installation, you must use the tractor's display or a diagnostic tool to perform a valve calibration procedure so the UCM can learn the neutral position of the new pilot head.

   Crucial Step: After installation, you must use the tractor's display or a diagnostic tool to perform a valve calibration procedure so the UCM can learn the neutral position of the new pilot head.