Case IH 4549 – Armrest Controller (ATC / Armrest) or EHR (Electro-Hydraulic Remote) controller: Front remote No.4 - spool movement too high

The Electro-Hydraulic Remote (EHR) system has detected that the internal spool of the #4 front remote valve has traveled beyond its calibrated physical range, or the potentiometer monitoring the spool's position is sending an out-of-bounds voltage signal back to the controller.

• Puma/Mid Range Magnum
• MAXXUM T4E
• Case IH Puma Series (115, 125, 140, 155, 165, 180, 195, 210, 225)
• Case IH Magnum Series (200, 235, 305, 340)
• Case IH Steiger Series
• Case IH Optum Series
• Case IH Maxxum Series

1. 1

   Inspect the pilot valve head on the EHR valve (dealer mechanics note a faulty original pilot head is the most common cause)

2. 2

   Inspect the potentiometer on the #4 front remote valve for physical damage or electrical failure

3. 3

   Inspect the EHR control valve wire harness for shorts, corrosion, or open circuits that could distort the potentiometer signal

4. 4

   Check the valve spool for mechanical binding, contamination, or sticking that could cause erratic movement

1. 1

   Clean the Area

   Thoroughly clean the area around the #4 front remote valve to prevent dirt from contaminating the hydraulic system.

2. 2

   Replace the Faulty Component

   If diagnostics point to the pilot head, remove and replace the pilot valve head. If the potentiometer is faulty, unbolt and replace the potentiometer.

3. 3

   Reassign Valve Addresses

   After replacing the pilot head or potentiometer, use the tractor's display/controller to reassign the valve addresses. This ensures the controller correctly identifies which armrest lever controls the #4 valve.

4. 4

   Perform Calibration

   Use the Case IH special service tool/software to perform the EHR valve calibration procedure. This tunes the valve for proper function and teaches the controller the new physical limits of the spool.

5. 5

   Clear Codes

   Clear the 4549 fault code from the Armrest/EHR controller and test the remote for proper operation.