Massey Ferguson 8.02.50 – HITCH: Issue With Signal From Rear Hitch Right Draft Pin

The signal voltage coming from the right lower link load-sensing pin (draft pin) is outside of its normal, expected operating range. The system detects that the sensor has either failed low (open circuit/short to ground) or failed high (short to power).

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 3000 series
• 3100 series
• 5400 series
• 6100 series
• 6200 series
• 6400 series

1. 1

   Inspect the right draft pin sensor and its 3-pin connector for physical damage, moisture ingress, or severe corrosion.

2. 2

   Test the wiring harness between the right draft pin and the HITCH controller for chafed, damaged, or broken wires.

3. 3

   Disconnect the sensor and turn the key ON to verify that the controller is supplying the correct reference voltage (typically 5V or 8V depending on EDC generation) and a solid ground to the connector pins.

4. 4

   Test the signal wire for a short to ground or a short to the 12V supply.

1. 1

   Relieve mechanical tension

   Lower the rear hitch completely and support the right lower link arm to remove all mechanical tension from the draft pin.

2. 2

   Disconnect battery

   Turn off the tractor and disconnect the battery to prevent electrical spikes.

3. 3

   Disconnect electrical plug

   Disconnect the 3-pin electrical plug from the right draft pin sensor.

4. 4

   Remove retaining hardware

   Remove the retaining hardware (usually a locking bolt or retaining pin) that secures the draft pin to the tractor chassis/lower link bracket.

5. 5

   Remove faulty pin

   Slide the faulty draft pin out of the linkage.

6. 6

   Install new pin

   Clean the bore, apply a light coat of anti-seize if recommended by the manual, and install the new OEM load-sensing pin.

7. 7

   Reassemble components

   Reinstall the retaining hardware and reconnect the electrical harness.

8. 8

   Perform calibration

   You must perform a Hitch Controller Calibration (EDC Calibration) procedure. This teaches the HITCH module the new sensor's specific 'no-load' baseline voltage.