Case IH 112 – Armrest Controller: Aux 1st remote valve FLOW potentiometer is failed in the Armrest Controller

The controller is detecting an out-of-range voltage, an open circuit, or a short circuit from the rotary dial (potentiometer) used to set the hydraulic flow rate for the #1 auxiliary remote valve. A common physical cause is a worn-out carbon track inside the potentiometer, creating a "dead spot" in the dial's sweep.

• Magnum
• Magnum Series
• MX215
• MX245
• MX275
• MX305
• 235
• 260
• 290
• 310
• 340
• Steiger Series
• Quadtrac Series
• 335
• 380
• 430
• 485
• 500
• 530
• 550
• Puma Series
• Maxxum Series
• MX Series
• TG Series

1. 1

   Perform a sweep test: Turn the key ON and slowly turn the 1st remote flow dial from 0% to 100% while watching the flow percentage on the tractor's display. Look for erratic jumps or dropouts.

2. 2

   Perform a resistance check: Use a multimeter to test the potentiometer for smooth resistance changes across the sweep. OEM flow control potentiometers are typically 1000 Ohm.

3. 3

   Perform a component swap test to isolate the dial from the wiring: Swap the electrical connector of the #1 flow potentiometer with the #2 flow potentiometer. If the fault code changes to 113, the potentiometer itself is physically bad. If the code remains 112, the issue is likely a broken wire, a loose pin in the armrest wiring harness, or a failure on the armrest circuit board itself.

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the battery to prevent electrical shorts while working inside the armrest.

2. 2

   Disassemble the Armrest

   Remove the retaining screws securing the right-hand armrest console cover/trim. Carefully lift the cover to expose the internal controls, wiring harnesses, and circuit boards.

3. 3

   Locate the Component

   Locate the Aux 1st remote valve flow control dial assembly.

4. 4

   Remove the Knob

   Pull the plastic adjustment knob straight up and off the top of the potentiometer shaft.

5. 5

   Disconnect Wiring

   Unplug the 3-pin electrical connector from the bottom of the potentiometer.

6. 6

   Remove the Potentiometer

   Remove the retaining nut (typically a 3/8-32 nut) that secures the potentiometer to the armrest bracket or panel. Pull the failed potentiometer out from the bottom.

7. 7

   Install the New Part

   Insert the new potentiometer, align the anti-rotation tab (if equipped), and tighten the retaining nut.

8. 8

   Reassemble

   Reinstall the plastic knob, plug in the electrical connector, and carefully reassemble the armrest console plastics. Reconnect the battery.

9. 9

   Calibration

   Turn the key ON and navigate to the tractor's diagnostic/calibration menu. You must perform an Armrest Controller Calibration (specifically the SCV / remote valve calibration) so the module can learn the new minimum and maximum voltage limits of the replacement potentiometer.