Massey Ferguson 0A.70.28: External Hydraulic Valve 7 Issue

The tractor's onboard diagnostic system has detected a malfunction, performance failure, or electrical connection problem specifically on 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

   Verify that the hydraulic fluid is at the correct level and in good condition. Inspect the hydraulic filter for clogs, which can restrict flow and trigger valve errors.

2. 2

   Check the external hydraulic valve block (specifically Valve 7) and remote couplers for physical damage, worn seals, or fluid leaks.

3. 3

   Inspect the wiring harness and electrical connector at Valve 7 for loose pins, corrosion, or broken wires.

4. 4

   Check for air in the hydraulic system, which can cause sluggish response, and bleed the system if necessary.

1. 1

   Depressurize the System

   Turn off the tractor and cycle the hydraulic controls to relieve all hydraulic pressure before beginning work.

2. 2

   Disconnect Electricals

   Locate External Hydraulic Valve 7 on the rear remote stack and carefully disconnect its electrical wiring harness.

3. 3

   Remove Hoses

   Disconnect the hydraulic lines/hoses attached to the valve. Cap the lines immediately to prevent dirt and debris from contaminating the hydraulic system.

4. 4

   Unbolt the Valve

   Remove the mounting bolts securing the faulty spool valve to the hydraulic manifold/stack.

5. 5

   Prep the Surface

   Clean the mounting surface thoroughly. Remove any old O-rings or seals.

6. 6

   Install the New Valve

   Place the new O-rings/seals into position (using a hydraulic valve mounting O-ring kit) and bolt the new external hydraulic valve into place. Torque the bolts to the manufacturer's specifications.

7. 7

   Reassemble

   Reconnect the hydraulic lines and plug the electrical connector back into the valve solenoid.

8. 8

   Refill and Bleed

   Top off the hydraulic fluid, start the tractor, and bleed the system of any trapped air.

9. 9

   Clear the Code

   Use a compatible Massey Ferguson diagnostic tool to clear the 0A.70.28 code from the system and test the remote for proper operation.