Massey Ferguson 8.01.22 – HITCH: Rear Hitch Position Sensor Signal Voltage Issue

The control module is receiving an implausible signal, an out-of-range voltage (either too high or too low), or no signal at all from the rear hitch rotary position sensor (potentiometer).

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S

1. 1

   Visually inspect the wire harness leading from the HITCH controller to the rear hitch position sensor for rub points, pinched wires, or damaged insulation.

2. 2

   Disconnect the sensor and check for corrosion, bent pins, or moisture inside the connector.

3. 3

   Turn the key ON and test the reference voltage at the sensor connector. This should be a steady 5V or 8.5V reference signal from the ECU.

4. 4

   Using a multimeter, test the resistance of the rotary position sensor while manually moving the hitch linkage. The resistance should change smoothly without any dead spots or sudden drop-offs.

1. 1

   Lower the hitch

   Ensure the rear 3-point hitch is fully lowered and the tractor is turned off to remove any mechanical tension.

2. 2

   Remove the sensor

   Unplug the electrical connector and unbolt the rotary position sensor from the rear linkage assembly.

3. 3

   Install the new sensor

   Mount the replacement rotary position sensor, ensuring the mechanical linkage/rod is properly aligned with the sensor's rotational axis.

4. 4

   Reconnect wiring

   Plug the harness back in and secure it away from moving linkage parts.

5. 5

   Calibrate the hitch

   After replacing the sensor, perform a hitch calibration procedure via the tractor's Datatronic display or a specific sequence of the hitch controls to teach the HITCH controller the new minimum (fully lowered) and maximum (fully raised) voltage values of the new sensor.