Massey Ferguson X28 – Autotronic 5 Linkage controller or HITCH control module: Rear Linkage Lowering Solenoid Valve Issue

The fault code indicates an electrical fault within the circuit of the rear linkage lowering solenoid valve, likely a short circuit to a power source/ground or an open circuit. This component is responsible for controlling the lowering function of the rear linkage system. When this fault occurs, the electronic controls will be unable to lower the rear three-point hitch.

• 3000 Series
• 3600 Series
• 4200 Series
• 4300 Series
• 5400 Series
• 5700SL Series
• 6100 Series
• 6200 Series
• 6400 Series
• 6700 Series
• 7600 Series
• 7700 Series
• 8100 Series
• 8200 Series

1. 1

   Check hydraulic fluid level and condition, and verify other hydraulic functions operate correctly to rule out a general hydraulic failure.

2. 2

   Attempt to press the manual override button or pin on the solenoid valve with the engine running to see if the linkage moves, ruling out a mechanical or hydraulic issue.

3. 3

   Visually inspect the wiring harness leading to the rear linkage control valve for chafing, corrosion, or breaks.

4. 4

   Disconnect the electrical connector from the lowering solenoid and inspect the pins for corrosion, moisture, or damage. Clean the connector with electrical contact cleaner if necessary.

5. 5

   Perform a resistance test on the disconnected solenoid coil (infinite resistance indicates an open circuit; near-zero indicates a short circuit). Compare the reading to an identical known-good solenoid (like the lifting solenoid) if possible.

6. 6

   Perform a click test by applying 12V DC directly to the solenoid terminals to verify internal plunger actuation.

7. 7

   With the ignition on and linkage set to lower, check for 12V power at the harness-side connector.

1. 1

   Safety First

   Park the tractor on a level surface, lower all implements to the ground, shut off the engine, and disconnect the battery before beginning any electrical repairs.

2. 2

   Locate the Solenoid Valve

   Locate the rear linkage solenoid valves in a valve block on the side of the transmission or rear axle housing, often on the left-hand side.

3. 3

   Perform Diagnostic Tests

   Follow the diagnostic checks listed above to confirm whether the fault is with the solenoid itself, the wiring, or the controller.

4. 4

   Replace the Solenoid

   Unscrew the retaining nut or mechanism to slide off the old coil, or unscrew the entire valve cartridge from the hydraulic block (be prepared for fluid loss). Install the new solenoid coil or valve cartridge, ensuring any seals or O-rings are correctly seated, and reconnect the electrical connector.

5. 5

   Final Checks

   Reconnect the battery and start the tractor. Test the operation of the rear linkage to ensure the repair was successful. If a new valve was installed, calibrate the electronic linkage control system.