New Holland NH 4123 – EHR (Electro-Hydraulic Remote) Controller or ATC (Armrest Controller): Remote No.2 Manually operated

This code indicates that the control module detects the spool for the second rear electro-hydraulic remote (EHR) valve is moving or positioned outside of its neutral state without an active electronic command from the cab. This typically means the valve is either being physically overridden via the manual lever, or there is a failure in the valve's proportional actuator/internal position potentiometer sending a false position signal back to the controller.

• T6
• T7
• T8
• T9
• TS6
• Genesis series
• Magnum
• Puma

1. 1

   Check for physical interference: Verify that the manual override lever on rear remote valve #2 is in the neutral position and is not stuck, bound by debris, or being accidentally actuated.

2. 2

   Inspect the 4-pin electrical connector and wiring harness at the proportional actuator on remote valve #2 for moisture, corrosion, or damaged pins that could distort the potentiometer's voltage signal.

3. 3

   Attempt to run the EHR valve calibration procedure through the tractor's display monitor. If the spool cannot find or learn neutral, the calibration will fail, confirming a hard fault in the actuator.

4. 4

   Perform a component swap test: Swap the proportional actuator from Remote #2 with the actuator from Remote #1 or #3. If the fault code follows the component, the actuator itself is definitively faulty.

1. 1

   Relieve hydraulic pressure

   Park the tractor on a level surface, lower all implements, turn off the engine, and cycle the remote controls in the cab to relieve all hydraulic pressure in the system.

2. 2

   Locate valve

   Locate the rear hydraulic valve stack at the back of the tractor and identify Rear Remote Valve No. 2.

3. 3

   Disconnect electrical connector

   Disconnect the 4-pin electrical connector from the proportional actuator mounted on the valve body.

4. 4

   Remove mounting hardware

   Remove the mounting hardware (usually Allen head bolts) securing the actuator to the remote valve.

5. 5

   Remove faulty actuator

   Carefully remove the faulty actuator, ensuring no dirt or debris falls into the hydraulic valve body. Clean the mounting surface.

6. 6

   Install new actuator

   Install the new proportional actuator, ensuring the internal linkage properly engages the valve spool.

7. 7

   Secure actuator and reconnect harness

   Tighten the mounting hardware to OEM torque specifications and reconnect the electrical harness.

8. 8

   Access diagnostic menu

   Turn the tractor key to the ON position and access the tractor's diagnostic/calibration menu.

9. 9

   Perform calibration

   Perform the EHR valve calibration procedure to teach the controller the new actuator's neutral, full-extend, and full-retract positions. Clear the inactive NH 4123 fault code.