Massey Ferguson 08.02.22 – HITCH: Rear Hitch Position Sensor Signal Voltage Issue (HITCH)

The controller is detecting that the signal voltage from the rear hitch position sensor (a potentiometer that monitors the angle/height of the rear rockshaft) is outside of the expected normal operating range. This typically indicates an open circuit, a short to ground, a short to power, or a failed potentiometer. When this code is active, the 3-point hitch may become inoperable, jump erratically, or fail to calibrate.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Verify system voltage: Ensure the tractor battery is fully charged (around 12.6V) and the alternator is functioning properly, as low voltage can trigger false sensor codes.

2. 2

   Inspect the wiring harness: Locate the rear hitch position sensor on the rear rockshaft. Inspect the 3-pin connector and wiring harness running back to the HITCH controller for rubbed, pinched, or broken wires, and terminal corrosion. Clean terminals with contact cleaner if necessary.

3. 3

   Test sensor voltage: Using a multimeter, verify that the sensor is receiving the correct reference voltage (typically 5V) and has a solid ground.

4. 4

   Check signal sweep: Back-probe the signal wire and manually move the hitch linkage (if safely possible). The voltage should change smoothly without dropouts or dead spots. Erratic voltage jumps indicate a worn-out internal potentiometer.

5. 5

   Attempt calibration: Try to run the hitch calibration procedure. If the hitch position jumps or the system refuses to calibrate, the sensor is likely at fault.

1. 1

   Turn off the tractor, remove the key, and disconnect the negative battery cable to prevent electrical shorts.

2. 2

   Locate the rear hitch position sensor assembly on the rear lift arm/rockshaft housing.

3. 3

   Disconnect the 3-pin wiring harness connector from the sensor.

4. 4

   Remove the mounting hardware (usually small bolts or screws) securing the sensor and its connecting linkage rod to the tractor housing.

5. 5

   Remove the old sensor.

6. 6

   Install the new sensor, ensuring the linkage rod is properly aligned with the rockshaft movement. Secure the mounting hardware.

7. 7

   Reconnect the 3-pin wiring harness connector.

8. 8

   Reconnect the battery.

9. 9

   Perform the Electrohydraulic Hitch calibration procedure via the tractor's dashboard or diagnostic tool so the HITCH controller can learn the new sensor's minimum and maximum voltage limits.

   Crucial Step