New Holland 4523 – Armrest Controller (ARU) / Universal Controller (UCM) / Hydraulic Controller: Primary Hydraulic Power System Electro-hydraulic Remote Valve Mid-mount Remote Control Valve, Self-engage, Front Remote No.2 - Manually Operated

The electronic control system has detected that the number 2 front electro-hydraulic remote (EHR) valve is being manually operated. This fault is triggered when the control module senses that the manual override function has been activated, which disables electronic control of the valve. The system logs this code because it cannot control the valve spool electronically as commanded, either because the manual override lever on the valve body is physically engaged or because a sensor is incorrectly reporting that it is.

• T7.170
• T7.185
• T7.190
• T7.200
• T7.210
• T7.220
• T7.225
• T7.230
• T7.235
• T7.245
• T7.250
• T7.260
• T7.270

1. 1

   Physically inspect the No. 2 front remote valve block to ensure the manual override lever or knob is in the neutral or automatic position, not manually engaged.

2. 2

   Check the tractor's diagnostic menu for related active or stored fault codes (e.g., 4525 for potentiometer, 4524 for driver, or 4518/4519 for voltage issues).

3. 3

   Inspect the wiring harness and connectors leading to the No. 2 front remote valve for damage, corrosion, dirt, or loose connections on the main, potentiometer, and solenoid connectors.

4. 4

   Test the valve's potentiometer by measuring resistance between the center wire and the two outer wires while operating the valve (resistance should change smoothly without dropping to zero or spiking to infinity).

5. 5

   Verify system voltage is above 12.5V and ensure all main power and ground connections to the chassis and controllers are clean and tight to rule out ghost faults.

1. 1

   Deactivate manual override

   Ensure the manual override on the No. 2 front remote valve is disengaged. Cycle the tractor's ignition key off and on to see if the fault code clears.

2. 2

   Clean electrical connections

   Turn off the tractor and disconnect the battery. Disconnect the electrical connector at the No. 2 remote valve, clean the pins and receptacles with electrical contact cleaner, re-seat firmly, and reconnect the battery.

3. 3

   Replace potentiometer

   If the fault persists (especially if code 4525 is also logged) and resistance readings are erratic or out of specification, replace the potentiometer on the valve.

4. 4

   Inspect and clean valve spool

   If electrical components are functioning correctly, remove and disassemble the valve to inspect for a sticky or seized spool that may be preventing the valve from returning to the neutral position. Clean as necessary.

5. 5

   Calibrate valve

   After replacing any component on the electro-hydraulic remote valve, perform a calibration procedure through the tractor's diagnostic 'H' menu to ensure the controller learns the new component's operating range.