Case IH R44 – EHR (Electronic Hitch/Remote) Control Unit: Valve 4 Supply Under Voltage/Over Voltage Or Output Stage Faulty Or Transducer Faulty Or Spool Neutral Error Or Spool Not Neutral Error

This indicates a failure in the 4th Electro-Hydraulic Remote (EHR) valve circuit. The system has detected that the voltage supplied to the valve is out of range, the electronic output stage/pilot head has failed, the position transducer is sending incorrect data, or the internal hydraulic spool is mechanically failing to return to its neutral, centered position.

• MXM
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190
• Maxxum
• Puma
• Steiger
• Quadtrac

1. 1

   Test the tractor's system voltage to rule out a general over/under voltage condition.

2. 2

   Inspect the wiring harness from the cab controls to the EHR controller, and from the controller to the remote valves, looking for shorts or open circuits.

3. 3

   Access the tractor's onboard diagnostic H-Menu (menu H5) to verify that the physical switches/levers in the cab are functioning and sending the correct signals.

4. 4

   Navigate to menu H1 to attempt a manual calibration of the remote valves. If the valve spool is mechanically stuck, the calibration will fail to complete.

5. 5

   Swap the electronic pilot head from Valve 4 with a known working valve (e.g., Valve 3). If the fault code changes to R34, the electronic pilot head is faulty. If the code remains R44, the mechanical spool inside Valve 4 is likely binding.

1. 1

   Preparation

   Disconnect the tractor's battery to prevent electrical shorts. Thoroughly clean the rear hydraulic valve stack to prevent dirt from contaminating the hydraulic system.

2. 2

   Wiring Repair

   If harness testing revealed a fault, repair the damaged wiring or replace the corroded connector pins at the EHR controller or the valve itself.

3. 3

   Pilot Head Replacement

   If the diagnostic isolation test pointed to the electronic module (pilot head), unbolt the faulty pilot head from the top of Valve 4 and install a replacement unit.

4. 4

   Valve Replacement

   If the spool is mechanically stuck (failing to reach neutral) and cannot be freed, the entire remote valve slice must be replaced. Unbolt the tie-rods holding the hydraulic valve stack together, remove the faulty Valve 4 section, and insert the new replacement valve.

5. 5

   Reassembly

   Torque the valve stack tie-rods to factory specifications and reconnect all hydraulic lines and electrical harnesses.

6. 6

   Recalibration

   Reconnect the battery, start the tractor, and enter the H-Menu (H1). Run the EHR calibration procedure so the central controller can learn the travel limits of the new transducer and spool. Clear the stored R44 fault code.