Case IH 4539 – Armrest Controller (ARM) or Electronic Hitch/Remote (EHR): Front remote no. 3 - potentiometer faulty

The control module is receiving an out-of-range, missing, or implausible electrical signal from the potentiometer responsible for monitoring the position of the #3 front remote hydraulic valve.

• Puma/Mid Range Magnum
• MAXXUM T4E
• VESTRUM CVX
• Puma (165, 180, 195, 210, 225 CVX)
• Steiger
• Magnum (including MX / TG series)
• Maxxum

1. 1

   Isolate the component by swapping electrical connections between remote #3 and a known working remote (such as #4). If the fault moves, the valve's potentiometer is faulty; if it stays, the issue is in the armrest controller or wiring.

2. 2

   Inspect the wiring harness and connectors between the armrest controller and the front remote valve stack for rubbed wires, corrosion, or bent pins.

3. 3

   Connect a diagnostic tool or use the tractor's display to check the potentiometer's voltage range to determine if it has fallen out of calibration.

1. 1

   Relieve hydraulic pressure

   Park the tractor on a level surface, lower all implements, turn off the engine, and cycle the remote levers to relieve any residual hydraulic pressure.

2. 2

   Locate the faulty potentiometer

   Depending on your diagnostic results, this will either be the flow control/lever potentiometer inside the armrest console or the spool position potentiometer mounted directly on the #3 front remote valve slice.

3. 3

   Disconnect electrical connector

   Disconnect the electrical connector from the faulty potentiometer.

4. 4

   Remove defective potentiometer

   Unbolt and remove the defective potentiometer from the valve block or armrest assembly.

5. 5

   Install replacement potentiometer

   Install the replacement potentiometer and secure the mounting hardware.

6. 6

   Reconnect electrical harness

   Reconnect the electrical harness.

7. 7

   Perform remote valve calibration

   You must perform a remote valve calibration (SCV calibration) using the tractor's AFS Pro display or a dealer diagnostic tool. The controller needs to learn the new potentiometer's exact neutral, minimum, and maximum voltage positions.