New Holland NH 4121 – Armrest Module (ARU) / EHR Controller: Remote No.2 Spool movement to high

Indicates a mismatch between the commanded position and the actual position of the hydraulic spool valve. The electronic controller commanded the spool for Rear Remote Valve #2 to move, but the position sensor (potentiometer/LVDT) is reporting that the spool has traveled further than the expected or calibrated distance.

• New Holland T4 Series
• New Holland T5 Series
• New Holland T6 Series
• New Holland T7 Series
• New Holland T8 Series
• New Holland T9 Series
• New Holland T6000 Series
• New Holland T7000 Series

1. 1

   Inspect the wiring harness and connectors between the Armrest/EHR controller and Rear Remote Valve #2 for damaged pins, corrosion, or shorts to power/ground

2. 2

   Test the spool position sensor (potentiometer) on Remote Valve #2 for correct voltage and resistance to ensure it is not sending an out-of-range signal

3. 3

   Check the mechanical movement of the spool valve for sticking, binding, or over-travel caused by contaminated hydraulic fluid

4. 4

   Check if the remote valve requires a spool travel calibration (loss of calibration is a very common cause)

1. 1

   Relieve hydraulic pressure

   Relieve all hydraulic system pressure and turn off the tractor.

2. 2

   Inspect and clean connector

   Inspect and clean the electrical connector at Rear Remote Valve #2. Reconnect and ensure a tight fit.

3. 3

   Calibrate remote valve

   Attempt a remote valve calibration (spool travel calibration) via the tractor's monitor/display. If the calibration completes successfully, clear the fault codes and test the remote under load.

4. 4

   Replace position sensor

   If the calibration fails or the sensor tests out of specification, replace the EHR flow control potentiometer / position sensor on the remote valve.

5. 5

   Replace remote valve slice

   If replacing the sensor does not resolve the issue, the entire remote valve slice (EHR valve) may have internal mechanical damage (such as a broken return spring or scored bore) and will require replacement.

6. 6

   Perform final calibration

   After replacing any hydraulic or electronic parts, perform a final remote valve calibration and clear the fault codes.