Massey Ferguson A.22.20 – Hydraulic Control Module or Mid Mount Valve Module: External Hydraulic Valve 2 Issue

Malfunction within the second external hydraulic remote valve circuit. The underlying condition is typically an electrical connection problem on the hydraulic valve solenoid, an erratic/missing spool position sensor value, or an internal mechanical failure (such as a damaged spool bore, a failed centering spring, or foreign contamination) preventing the valve from returning to neutral or holding pressure.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7714 through 7726S

1. 1

   Inspect the wiring harness and connectors leading to External Hydraulic Valve 2 for shorts, corrosion, or connection problems

2. 2

   Use a compatible diagnostic tool to read the spool position sensor value and verify it is communicating with the module

3. 3

   Perform a spool leakage check: Position the hydraulic control handle in 'Neutral', connect a hydraulic hand pump (e.g., test kit N-1100) to the control valve port, and pressurize to 2500 psi

4. 4

   If the port cannot be pressurized during the leakage check, verify if oil is leaking around the spool, indicating a damaged spool/bore, a failing centering spring, or trapped foreign matter

1. 1

   Relieve Pressure

   Turn off the tractor and relieve all hydraulic system pressure before servicing.

2. 2

   Wiring Repair

   If the diagnostic check revealed a wiring fault at the solenoid or spool position sensor, repair or replace the damaged connector/harness.

3. 3

   Valve Disassembly & Cleaning

   If the spool leakage check failed, remove the External Hydraulic Valve 2 assembly. Disassemble, clean, and inspect the valve to ensure no contamination or foreign matter is stuck inside.

4. 4

   Re-test

   Reassemble the cleaned valve and repeat the 2500 psi hydraulic hand pump check.

5. 5

   Valve Replacement

   If no pressure can be obtained after cleaning, the internal spool or bore is permanently damaged. You must replace the entire hydraulic spool valve assembly.

6. 6

   Clear Codes

   Reinstall the valve, reconnect the hydraulic lines and electrical connectors. Connect a Massey Ferguson compatible diagnostic tool to the tractor's diagnostic port to clear the 0A.22.20 error code and test the hydraulic function.