New Holland 4133 – Tractor Control Unit (TCU), Armrest Control Module (ACM), or general hydraulic controller: Rear Remote No. 3 – Over Voltage

The control module has detected that the voltage in the electrical circuit for the rear electro-hydraulic remote (EHR) valve number 3 is above the manufacturer's specified limit. This over-voltage condition indicates an electrical fault, such as a short circuit to a power source or a faulty position sensor, which prevents proper function and typically causes the system to disable the affected remote as a safety precaution.

• T7.170
• T7.185
• T7.200
• T7.210
• T7.220
• T7.235
• T7.250
• T7.260
• T7.270
• T8.275
• T8.300
• T8.330
• T8.360
• T8.390
• T8.420
• T9.390
• T9.450
• T9.505
• T9.560
• T9.615
• T9.670

1. 1

   Visually inspect the wiring harness leading to the #3 rear remote valve for signs of chafing, melting, or corrosion

2. 2

   Check electrical connectors at the valve, controller, and intermediate connection points for corrosion, bent pins, or loose connections

3. 3

   Check the tractor's overall system voltage to ensure the alternator is not overcharging, which could cause high voltage across all systems

4. 4

   Test the potentiometer (position sensor) by disconnecting it and measuring resistance across the two outer terminals, then from the center terminal to an outer terminal while manually actuating the valve (resistance should change smoothly without jumps or open circuits)

5. 5

   Test the solenoid for a short circuit to power within its windings or in the wiring leading to it

1. 1

   Prepare machine for service

   Park the tractor on a level surface, shut down the engine, and disconnect the battery. Relieve any residual hydraulic pressure by moving the remote levers back and forth.

2. 2

   Locate and inspect remote valve

   Identify the #3 electro-hydraulic remote valve on the rear of the tractor (valves are typically stacked and numbered). Perform visual and electrical diagnostic checks on the wiring harness and connectors.

3. 3

   Replace faulty components

   If the solenoid or potentiometer is identified as faulty, replace the specific component. In many cases, the solenoid coil or potentiometer can be replaced without replacing the entire valve section.

4. 4

   Reassemble components

   Reconnect all electrical connectors, ensure the wiring is secure and protected from damage, and reconnect the battery.

5. 5

   Calibrate the remote valve

   Recalibrate the valve through the tractor's instrument cluster display (often in the 'H' service menu) by selecting the remote valve and initiating the process to allow the controller to learn the end-points of the spool's travel. For T9 series, a special tool (380001903) may be required to connect to the diagnostic port.

6. 6

   Perform final testing

   Start the tractor and test the operation of remote #3 to ensure it is functioning correctly and that the fault code does not reappear.