Case IH 1991-09 - UCM – UCM: Aux Valve 7 Port Flow Command

The pilot head for the #7 rear remote auxiliary valve is experiencing communication failures. A faulty pilot head can short or disrupt the network, effectively killing CAN bus communications and causing the module to reset unexpectedly.

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

1. 1

   Verify that the #7 pilot head is the root cause of the network disruption

2. 2

   Physically unplug the electrical connector to the #7 pilot head. If the pilot head has failed internally and is taking down the CAN bus, unplugging it will allow the rest of the remote valves and communications to come back online immediately

1. 1

   Locate the #7 pilot head valve assembly

   Locate the rear remote valve stack and identify the #7 pilot head valve assembly.

2. 2

   Unplug the electrical connector

   Unplug the electrical connector to the #7 pilot head to verify CAN bus communications are restored.

3. 3

   Remove retaining hardware

   Remove the retaining hardware (such as the M5 x 20mm hex socket screws) securing the pilot head to the valve body.

4. 4

   Remove the faulty pilot head

   Remove the faulty pilot head valve assembly.

5. 5

   Install the new pilot head

   Install the new pilot head valve assembly and secure the hardware.

6. 6

   Reconnect the electrical harness

   Reconnect the electrical harness.

7. 7

   Run hydraulic valve calibration

   Run the hydraulic valve calibration procedure via the tractor's display so the UCM can learn the new pilot head.