Case IH R28 – EHR (Electronic Hydraulic Remote) Controller: EHR Control Unit 2 Lever Faulty

Indicates a malfunction, signal failure, or calibration error in the electronic lever (or its internal potentiometer) that controls the #2 Electronic Hydraulic Remote (EHR) valve.

• MXM
• MXM Series (120, 130, 140, 155, 175, 190)
• Magnum Series (180, 200, 210, 215, 220, 260, 315, 380)
• Puma Series (140-240, 175 CVX)
• Maxxum Series (110, 115, 120, 125, 130, 140)
• Steiger / Quadtrac Series (350 to 600 horsepower models)

1. 1

   Check for neutral position errors: observe if the green cylinder light on the A-post display remains on when the lever is in neutral. If pulling the switch back slightly turns it off, the potentiometer is failing or out of calibration.

2. 2

   Inspect the wiring harness from the armrest controls to the EHR controller to rule out a short or open circuit.

3. 3

   Attempt a battery reset by disconnecting the tractor's battery for a short period to clear temporary glitches.

4. 4

   Attempt lever calibration (via A-post on Magnum/Steiger or H-Menu on MXM models). If calibration fails and throws a code, the potentiometer is likely dead.

1. 1

   Power down and disconnect battery

   Power down the tractor and disconnect the battery to prevent electrical shorts.

2. 2

   Disassemble console

   Disassemble the armrest console or side panel to access the underside of the EHR lever bank.

3. 3

   Disconnect wiring harness

   Disconnect the wiring harness connector specifically routed to the #2 EHR lever.

4. 4

   Remove faulty lever

   Unbolt or unclip the faulty lever assembly from the control bank.

5. 5

   Install new lever

   Install the new replacement lever and reconnect the wiring harness.

6. 6

   Reassemble console

   Reassemble the armrest console.

7. 7

   Reconnect battery and calibrate

   Reconnect the battery and perform the EHR lever calibration procedure so the controller can learn the new lever's exact neutral, extend, and retract voltage parameters.