New Holland NH 4146 – EHR (Electronic Hitch/Hydraulic Remote) Controller: Rear Remote No.4 - Under Voltage

This indicates that the voltage supplied to, or the feedback voltage sensed from, the electronic actuator on the #4 rear hydraulic remote valve has dropped below the minimum operational threshold.

• New Holland T6
• New Holland T7
• New Holland T8
• New Holland T9
• New Holland T6000

1. 1

   Verify system voltage from the battery and alternator is supplying the correct voltage (typically 12V-14V). A weak battery or failing alternator can trigger under-voltage codes.

2. 2

   Inspect the wiring harness and connector leading from the EHR controller to the Rear Remote No.4 valve for chafed wires, pinched harnesses, or corrosion.

3. 3

   Perform a component isolation swap test by swapping the electrical connector from Remote No.4 with Remote No.3. If the fault moves to No.3, the issue is in the harness or controller. If it stays on No.4, the valve's internal solenoid/processor has failed.

4. 4

   Ensure the electro-hydraulic remote lever in the cab is functioning correctly and sending the proper signal to the EHR controller.

1. 1

   Depressurize the System

   Turn off the tractor, lower all implements to the ground, and cycle the remote levers/switches in the cab to relieve any residual hydraulic pressure.

2. 2

   Disconnect the Valve

   Disconnect the electrical harness connector from the Rear Remote No.4 valve section. Remove the hydraulic lines attached to that specific spool.

3. 3

   Remove the Valve Section

   Unbolt the tie-rods holding the rear remote valve stack together. Carefully slide the faulty No.4 valve section out, ensuring you do not lose or damage the O-rings between the valve slices.

4. 4

   Install the New Valve

   Install the replacement valve section with new O-rings. Torque the stack tie-rods to the manufacturer's specification. Reconnect the hydraulic lines and the electrical harness.

5. 5

   EHR Valve Calibration

   Crucial Step. Each electro-hydraulic remote valve has a built-in processor. When a new valve is installed from the parts department, it has no assigned number. You must use the tractor's in-cab display (or a dealer diagnostic tool) to calibrate the EHR system and program the new valve to recognize itself as "Valve No.4".