Case IH 1979-00 - UCM – UCM: Rear pilot head #6 actuator temperature high

The UCM has detected an abnormally high temperature in the electronic actuator head of the #6 rear remote valve (Electro-Hydraulic Remote or EHR). This condition typically arises from an internal electrical short or failure, a mechanical bind in the hydraulic spool valve, a failed internal temperature sensor, or general hydraulic system overheating.

• MAGNUM AFS Connect
• Magnum AFS Connect (models 180 through 400)
• Steiger AFS Connect series

1. 1

   Verify the tractor's hydraulic oil level and check if the overall hydraulic oil temperature is running too hot (address general overheating first).

2. 2

   Inspect the wiring harness and connector going to the #6 rear remote valve for melted wires, corrosion, or signs of a short circuit to ground or power.

3. 3

   Perform a swap test: swap the electrical connection of the #6 actuator with an adjacent known-good remote (e.g., #4 or #5). If the fault moves, the actuator is internally faulty. If it stays at #6, the issue is in the wiring or UCM.

4. 4

   With the tractor off and hydraulic pressure relieved, manually check if the spool valve moves freely to rule out a mechanical bind causing the actuator to overwork.

1. 1

   Relieve Pressure

   Park the tractor on a level surface, lower all implements, turn off the engine, and cycle the remote levers/buttons to relieve all residual hydraulic pressure.

2. 2

   Disconnect Battery

   Disconnect the negative battery cable to prevent electrical shorts during the repair.

3. 3

   Remove the Actuator

   Disconnect the electrical harness from the #6 rear remote valve. Remove the retaining bolts holding the electronic actuator (pilot head) to the mechanical valve slice.

4. 4

   Inspect the Spool

   Before installing a new actuator, ensure the mechanical spool in the valve body moves smoothly and is free of debris or scoring.

5. 5

   Install New Part

   Mount the new EHR actuator head onto the valve section and torque the retaining bolts to the manufacturer's specification. Reconnect the electrical harness.

6. 6

   Recalibrate

   Reconnect the battery and power on the tractor. Use the AFS Pro 1200 display or the Case IH Electronic Service Tool (EST) to clear the inactive 1979-00 fault code.

7. 7

   EHR Calibration

   You must perform the EHR (Electro-Hydraulic Remote) valve calibration procedure via the AFS Connect monitor so the UCM can learn the neutral, extend, and retract limits of the new actuator.