Massey Ferguson A.40.24 – onboard diagnostic system / main vehicle ECU: External Hydraulic Valve 4 Issue

Malfunction, flow restriction, or electrical connection problem specifically isolated to the 4th external hydraulic remote valve (spool valve).

• 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

   Inspect the wiring harness and connector going to External Valve 4 for connection problems

2. 2

   Check the hydraulic/transmission fluid level and condition for contamination or a blocked filter

3. 3

   Check for visible fluid leaks around the valve body and O-rings

4. 4

   Check if the valve is physically unresponsive or mechanically binding due to debris or internal wear

5. 5

   Ensure the quick couplers and hoses attached to remote 4 are not damaged or blocked

1. 1

   Depressurize the System

   Turn off the tractor. Lower all implements to the ground and cycle the hydraulic control levers/buttons to relieve all residual pressure in the system.

2. 2

   Access the Valve Block

   Remove the rear inspection cover or access panel to reach the external hydraulic control valves.

3. 3

   Drain/Catch Fluid

   Place a catch pan beneath the valve block, as hydraulic fluid (UTTO) will leak during removal.

4. 4

   Disconnect Lines

   Carefully disconnect the electrical wiring harness and the hydraulic hoses/lines attached to Valve 4.

5. 5

   Remove the Valve

   Unbolt the faulty spool valve (slice) from the hydraulic manifold block.

6. 6

   Clean and Prep

   Clean the mounting surface thoroughly. Ensure no dirt or debris enters the exposed hydraulic system.

7. 7

   Install New/Rebuilt Valve

   Mount the replacement spool valve (or the repaired unit with new O-rings/seals) and torque the mounting bolts to OEM specifications.

8. 8

   Reconnect

   Reattach all hydraulic lines and plug in the electrical connectors.

9. 9

   Service Fluids

   Replace the hydraulic filter and top off the system with clean OEM UTTO fluid (e.g., 10W40 tractor fluid).

10. 10

    Purge Air

    Start the tractor and allow the oil to warm up. Slowly cycle the hydraulic system (Valve 4) several times to purge trapped air from the lines. Check for leaks and verify the fault code has cleared.