Case IH 4005 – EHR (Electronic Hitch/Hydraulic Remote) Control Unit / Armrest Controller (ARM/ATC): Levers are not calibrated at power up.

The tractor's computer does not recognize the position parameters of the Electronic Hitch/Hydraulic Remote (EHR) levers (also known as SCV levers) located in the armrest. This condition typically occurs when a new controller is installed, an EHR lever is replaced, or the internal potentiometer in one of the levers begins to fail and loses its memory.

• Magnum
• Steiger T4B
• Case IH Magnum Series
• Case IH Maxxum Series

1. 1

   Check recent service history to see if the EHR control unit or any armrest levers were recently replaced, which would require a routine calibration

2. 2

   Identify the faulty lever using the A-post display or Pro monitor (look for a remote light, such as a green cylinder light, staying on when the lever is physically in neutral)

3. 3

   Inspect the wiring harness and connectors between the EHR levers and the armrest controller to ensure pins are tight, undamaged, and free of corrosion

4. 4

   Test the internal potentiometer by observing the neutral light; if the light is on in neutral but goes out when you pull the switch back slightly, the potentiometer is likely failing

1. 1

   Attempt Calibration

   Hold the 'Prog' (Program) key on the A-post display while turning the ignition key to the ON position.

2. 2

   Attempt Calibration

   Navigate to the 'ARM' (Armrest) section and locate the calibration menu (often found under the HH > H1 menus depending on the model).

3. 3

   Attempt Calibration

   Follow the on-screen prompts: Pull the affected lever fully back (raise detent), then push it fully forward (lower detent), and finally return it to the neutral position.

4. 4

   Attempt Calibration

   Turn off the ignition key and wait at least 30 seconds before restarting the tractor to test the system.

5. 5

   Replace the Lever (If Calibration Fails)

   Disassemble the armrest control pod to access the EHR levers.

6. 6

   Replace the Lever (If Calibration Fails)

   Disconnect the wiring harness from the faulty lever.

7. 7

   Replace the Lever (If Calibration Fails)

   Remove the mounting screws and extract the faulty lever.

8. 8

   Replace the Lever (If Calibration Fails)

   Install the new EHR lever and reconnect the harness.

9. 9

   Replace the Lever (If Calibration Fails)

   You must repeat the calibration procedure outlined in Step 1 so the controller can learn the new lever's parameters.

10. 10

    Replace the Lever (If Calibration Fails)

    Clear the error code and test the hydraulic remotes for normal operation.