Massey Ferguson A.21.1A – Hydraulic control modules: External Hydraulic Valve 2 Issue

A malfunction in the second rear remote hydraulic spool valve, typically triggered by an electrical connection problem on the hydraulic valve, a loss of communication with the valve module, or an out-of-range value from the spool position sensor.

• 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
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S

1. 1

   Use a compatible Massey Ferguson diagnostic tool to retrieve and confirm active DTCs

2. 2

   Inspect the wiring harness leading to External Hydraulic Valve 2 for corrosion, backed-out pins, or damaged wires

3. 3

   Monitor the 'Spool Position Sensor Value' for Valve 2 using a diagnostic tool to check if the value changes smoothly or drops out

4. 4

   Verify CAN bus communication between the Dash and the Valve Module

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to prevent electrical shorts while working on the hydraulic modules.

2. 2

   Locate Valve 2

   Identify External Hydraulic Valve 2 in the rear remote valve stack.

3. 3

   Clean and Re-seat Connectors

   Disconnect the electrical plug at the valve actuator/spool position sensor. Clean the contacts with electrical contact cleaner, apply dielectric grease, and securely re-seat the connector.

4. 4

   Replace Faulty Components

   If the diagnostic tool proved the spool position sensor is dead, or if the valve is mechanically failing/leaking, remove the retaining bolts for Valve 2.

5. 5

   Rebuild or Swap

   If the valve is leaking externally, rebuild it using an OEM seal kit. If the electronic actuator or quick-release coupling is damaged, replace the specific component.

6. 6

   Clear Codes

   Reconnect the battery, turn on the ignition, and use your diagnostic tool to clear the 0A.21.1A code. Test the hydraulic remote to ensure the fault does not return.