Case IH R18 – EHR (Electronic Hitch Relief) Control Unit: EHR Control Unit 1 Lever Faulty

The system has detected a malfunction, corrupted signal, or out-of-range value originating from the potentiometer/lever that controls the #1 Electronic Hitch Relief (EHR) or electro-hydraulic remote valve.

• MXM
• Case IH MXM 120
• Case IH MXM 130
• Case IH MXM 140
• Case IH MXM 155
• Case IH MXM 175
• Case IH MXM 190
• Case IH Maxxum 100
• Case IH Maxxum 110
• Case IH Maxxum 115
• Case IH Maxxum 120
• Case IH Maxxum 125
• Case IH Maxxum 130
• Case IH Maxxum 135
• Case IH Maxxum 140
• Case IH Magnum MX180
• Case IH Magnum MX200
• Case IH Magnum MX210
• Case IH Magnum MX215
• Case IH Magnum 250-400

1. 1

   Perform the H-Menu Switch Test (H5) to verify if the #1 lever's potentiometer is registering inputs on the Electronic Instrument Cluster

2. 2

   Inspect the wiring harness running from the armrest controls to the EHR controller, and from the controller to the remote valves for open circuits, shorts to ground, or loose connections

3. 3

   Verify the lever's physical travel to ensure the potentiometer is not mechanically binding or out of adjustment

1. 1

   Disconnect Power

   Disconnect the tractor's battery before servicing the electrical components.

2. 2

   Access the Controls

   Open the armrest controller or side console where the EHR remote levers are housed.

3. 3

   Remove the Faulty Unit

   Disconnect the wiring harness from the faulty #1 EHR lever/potentiometer and unbolt the unit.

4. 4

   Install the New Part

   Install the replacement EHR lever or potentiometer and securely reconnect the 3-pin wiring harness.

5. 5

   Restore Power

   Reconnect the battery.

6. 6

   Mandatory Calibration

   Perform the Transmission/EDC Calibration Set Up Procedure. This is strictly required whenever a potentiometer has been replaced or the non-volatile memory has been reset.

7. 7

   Execute Calibration

   Enter the "H1" calibration menu via the Electronic Instrument Cluster. Follow the on-screen prompts to calibrate the travel limits of the new lever (e.g., pulling the lever into the raise detent position when prompted) until the system confirms the calibration is saved.