Massey Ferguson 0A.22.12 – Mid Mount Valve Module or Transmission/Hydraulic Controller: External Hydraulic Valve 2 Issue

Malfunction in the circuit or mechanical operation of the second rear hydraulic remote valve. The underlying condition is typically an electrical connection problem on the hydraulic valve, a faulty spool position sensor, or a mechanical restriction such as rusted spool valve detents.

• 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
• 7714S
• 7719S

1. 1

   Verify the hydraulic oil level and condition, as contaminated oil or a blocked filter can cause restricted flow and trigger valve performance faults

2. 2

   Inspect the wiring harness and connector at External Hydraulic Valve 2 for connection problems, broken wires, or corroded pins

3. 3

   Check the spool valve lever position sensor (X589) for physical damage or erratic readings

4. 4

   Test the physical movement of the spool valve to check for mechanical binding, such as rusted spool valve detents

1. 1

   Park the tractor on a level surface, lower all implements to the ground, turn off the engine, and relieve all hydraulic system pressure.

   Ensure the machine is safe to work on before beginning repairs.

2. 2

   Locate the External Hydraulic Valve 2 assembly at the rear remote block.

   Identify the correct valve assembly for troubleshooting.

3. 3

   Disconnect the electrical connector to the spool valve position sensor. Clean the contacts with electrical contact cleaner, apply dielectric grease, and reconnect.

   Addresses potential electrical connection problems.

4. 4

   If the valve is mechanically stiff, disassemble the spool valve detent mechanism. Clean away any accumulated rust and debris, lubricate the detents thoroughly, and reassemble.

   If the detents are heavily corroded, install a spool valve repair kit.

5. 5

   If the wiring and mechanical movement are fine but the code persists, remove and replace the faulty spool valve position sensor.

   Replaces the sensor if it is failing to read the valve's location.

6. 6

   Reassemble all components and top up the hydraulic/transmission fluid if any was lost during the repair.

   Restores fluid levels to ensure proper hydraulic operation.

7. 7

   Connect a compatible Massey Ferguson diagnostic tool to the tractor's interface to clear the 0A.22.12 fault code.

   Clears the logged fault from the system.

8. 8

   Start the tractor and test the #2 remote hydraulic function with an implement to ensure normal operation and verify the code does not return.

   Confirms the repair was successful.