Massey Ferguson 0A.6X.21 – Auxiliary Hydraulic / Implement Valve ECU: External Hydraulic Valve 6 Issue

Indicates a malfunction in the 6th rear remote electronic spool valve (spool slice), typically an electrical circuit failure, a communication loss with the valve's internal solenoid, or a pilot pressure control failure within that specific valve slice.

• 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
• 5608-5613
• 5710SL-5713SL
• 6445-6499
• 6613-6616
• 7465-7495
• 7614-7626
• 7714-7726S

1. 1

   Inspect the 4-pin electrical connector on the #6 remote valve slice at the rear of the tractor for ingress of dirt, moisture, or corroded pins.

2. 2

   Swap the electrical connector from Valve 6 to an adjacent known-good valve (e.g., Valve 5). If the fault code changes to the Valve 5 circuit, the issue is in the tractor's wiring harness. If the code remains on Valve 6, the electronic spool slice itself has failed internally.

3. 3

   Ensure the hydraulic/transmission fluid (UTTO) is at the correct level and the hydraulic filters are not blocked, as contaminated oil can cause the pilot pressure controls inside the valve to stick.

1. 1

   Relieve pressure and clean

   Relieve all hydraulic pressure from the system and thoroughly clean the rear remote valve stack to prevent dirt from entering the hydraulic system.

2. 2

   Disconnect electrical connector

   Disconnect the 4-pin electrical connector from the #6 valve slice.

3. 3

   Remove hoses and couplers

   Remove the hydraulic hoses and quick couplers attached to that specific slice.

4. 4

   Unbolt tie-rods

   Unbolt the long tie-rods that hold the modular valve stack together.

5. 5

   Remove faulty slice

   Carefully slide out the faulty #6 electric spool slice.

6. 6

   Install new slice

   Install the new spool slice, ensuring that all O-rings between the slices are new and properly seated.

7. 7

   Torque tie-rods

   Reinsert and torque the tie-rods to the manufacturer's specifications.

8. 8

   Reconnect lines and connector

   Reconnect the hydraulic lines and the 4-pin electrical connector.

9. 9

   Calibrate spool slice

   The new electric spool slice will likely need to be programmed/calibrated to the tractor's ECU using a dealer diagnostic tool before it will operate correctly.