Massey Ferguson 0A.72.1B – Hydraulic Control Unit: External Hydraulic Valve 7 Issue

Indicates a malfunction, connection problem, or failure in the 7th external hydraulic remote/spool valve circuit.

• 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
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Inspect the wiring harness and connector at External Hydraulic Valve 7 for corrosion, bent pins, or a loose connection (connection problems are a primary cause of electronic valve faults)

2. 2

   Inspect the valve block and spool for visible hydraulic fluid leaks or damaged O-rings

3. 3

   Determine if the valve is physically sticking in one direction or failing to actuate

4. 4

   Ensure the tractor's hydraulic fluid reservoir is at the correct level and the fluid is uncontaminated

1. 1

   Relieve Pressure

   Turn off the tractor and relieve all hydraulic pressure from the system by actuating the hydraulic levers/controls.

2. 2

   Drain/Prepare

   Have a large bucket ready, as removing hydraulic components can be messy and release residual fluid.

3. 3

   Disconnect Electronics

   Unplug the electrical wiring harness connector from External Hydraulic Valve 7.

4. 4

   Remove Lines

   Disconnect the hydraulic hoses and lines attached to the valve block.

5. 5

   Dismount Valve

   Unbolt the faulty external hydraulic valve from the hydraulic valve support/block.

6. 6

   Repair or Replace

   If the valve is leaking, install a hydraulic valve repair kit (new seals and O-rings). If the electronic solenoid or spool is internally failed, replace the entire valve assembly.

7. 7

   Reinstall

   Mount the new or repaired valve, torque the mounting bolts to OEM specifications, and reconnect all hydraulic lines and electrical connectors.

8. 8

   Refill and Clear

   Top off the hydraulic fluid, bleed the system of air if necessary, and use a compatible Massey Ferguson diagnostic tool to clear the 0A.72.1B code from the system.