Case IH 119 – Armrest Controller (ARM) or Tractor Multi-Function (TMF) Controller: Auxiliary 4th remote valve FLOW potentiometer has failed

The potentiometer is the dial/switch located in the cab that allows the operator to adjust the hydraulic flow rate to the 4th rear remote valve. The fault triggers when the controller detects an out-of-range signal (voltage too high, too low, or an open/short circuit), meaning the system can no longer accurately read the operator's flow setting.

• MX Magnum
• STX Steiger
• MX Magnum Series
• TG Series
• Steiger 4WD Series (e.g., 335, 380, 430, 500, Quadtrac)
• Puma Series
• Maxxum Series

1. 1

   Verify the code is active and specifically points to the 4th remote flow potentiometer.

2. 2

   Perform a sweep test on the physical dial to check for 'dead spots' or bad spots in their sweep (e.g., failing around the 25% mark).

3. 3

   Remove the armrest cover and inspect the wiring harness connecting the potentiometer to the Armrest Controller board for pinched wires, broken connections, or loose pins.

4. 4

   Using a multimeter, verify that the potentiometer is receiving its 5V reference voltage from the controller and test the resistance to ensure it matches OEM spec (typically 1000 Ohm or 3000 Ohm).

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to prevent electrical shorts while working on the Armrest Controller.

2. 2

   Access the Armrest

   Remove the retaining screws to open the right-hand armrest console/multi-function handle housing.

3. 3

   Locate the Component

   Locate the specific flow control potentiometer for the 4th auxiliary valve on the printed circuit board/panel.

4. 4

   Disconnect

   Unplug the electrical connector harness from the back of the faulty potentiometer.

5. 5

   Remove Hardware

   Remove the retaining nut (often a 3/8-32 nut) and washer holding the potentiometer to the console panel. Pull the old potentiometer out.

6. 6

   Install New Part

   Insert the replacement potentiometer, secure it with the retaining nut and washer, and reattach the control knob.

7. 7

   Reconnect

   Plug the electrical harness back into the new potentiometer.

8. 8

   Reassemble and Calibrate

   Reassemble the armrest console, reconnect the battery, and clear the fault codes. If required by the specific model's service manual, perform a remote valve calibration via the tractor's display monitor.