New Holland 18014 – ARU: Rear Hitch Potentiometer Voltage Too Low

The armrest control unit has detected that the voltage from the rear hitch position control potentiometer is below the normal operating range. This sensor informs the control system of the exact height and position of the rear hitch arms. A low voltage condition is typically caused by a short circuit to ground in the wiring, an internal failure of the potentiometer, or a poor electrical connection, which will result in erratic or non-functional rear hitch control.

• T6
• T7
• T8
• Magnum
• Maxxum
• Puma

1. 1

   Check the tractor's diagnostic display for other active fault codes (multiple low voltage codes may indicate a broader 5-volt reference supply issue)

2. 2

   Inspect the wiring harness and connectors leading to the rear hitch position potentiometer (located in the rear rockshaft lift arm linkage assembly) for chafing, corrosion, or loose connections

3. 3

   Inspect and clean the main ground strap from the battery to the chassis, as well as any other ground connections associated with the cab and control modules

4. 4

   Test the potentiometer with a multimeter: measure resistance between the two outer terminals, then measure between one outer terminal and the center terminal while slowly rotating the shaft (resistance should change smoothly without sudden jumps or dropouts)

1. 1

   Prepare machine for service

   Ensure the tractor is on level ground, the parking brake is engaged, and the engine is off.

2. 2

   Remove the faulty potentiometer

   Locate the rear hitch position potentiometer on the rear of the tractor, connected to the three-point hitch linkage. Disconnect the electrical connector and remove the mounting bolts.

3. 3

   Install the new potentiometer

   Mount the new potentiometer, ensuring it is correctly oriented. Reconnect the electrical connector.

4. 4

   Clear fault codes

   Use the tractor's diagnostic menu to clear the active fault codes after the new sensor is installed.

5. 5

   Calibrate the hitch

   Perform an Electronic Draft Control (EDC) calibration to teach the control module the new potentiometer's voltage range. With transmission oil at operating temperature, access the diagnostic 'H' menu, navigate to hitch calibration, and follow on-screen prompts to move the hitch control lever to fully raised and lowered positions. Save settings and exit.