Massey Ferguson A.21.26: External Hydraulic Valve 2 Issue

Connection problem on the hydraulic valve, a fault with the spool position sensor value, or a failure in the valve's ability to build/direct hydraulic pressure properly.

• 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

   Check for a connection problem on the hydraulic valve harness, as electrical faults are a primary trigger for the 0A.XX series codes.

2. 2

   Verify the spool position sensor value using a compatible diagnostic tool to ensure the sensor is reading the valve's physical position accurately.

3. 3

   Ensure the tractor's hydraulics are actually set for the external hydraulic circuit rather than being diverted to the three-point hitch.

4. 4

   Verify that the hydraulic belly pump has not failed or become weak, which can mimic valve failure by preventing the external circuit from building pressure.

1. 1

   Confirm DTC

   Connect a compatible diagnostic interface device to retrieve and confirm the active 0A.21.26 DTC.

2. 2

   Inspect and repair wiring

   Inspect the wiring harness leading to External Hydraulic Valve 2. Clean the connector contacts and repair any frayed wires.

3. 3

   Diagnose spool position sensor

   If the electrical connection is sound but the spool position sensor is failing, the sensor or the spool valve assembly must be removed.

4. 4

   Relieve hydraulic pressure

   Relieve all hydraulic system pressure before unbolting the valve.

5. 5

   Remove valve assembly

   Remove the faulty External Hydraulic Valve 2 / Spool Valve assembly.

6. 6

   Rebuild or replace valve

   Either rebuild the valve using an OEM repair kit or replace the entire spool valve assembly with a new unit.

7. 7

   Reinstall and recalibrate

   Reinstall the valve, bleed the hydraulic system, and use the diagnostic tool to clear the code and recalibrate the spool position sensor.