Massey Ferguson A.4X.27 – Onboard Diagnostic System / Hydraulic Control Module: External Hydraulic Valve 4 Issue

Malfunction, electrical fault, or connection problem with the 4th rear remote hydraulic spool valve on the tractor.

• 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

   Use a compatible diagnostic tool to retrieve the exact code and verify if it is active or stored

2. 2

   Locate the rear remote valve stack at the back of the tractor and identify Valve 4. Inspect for physical damage, severe fluid leaks, or debris interfering with the spool

3. 3

   Disconnect the wiring harness to the Valve 4 solenoid and check for bent pins, corrosion, or moisture inside the connector

4. 4

   Check the wiring harness leading to the valve for chafing, breaks, or shorts to ground

1. 1

   Power Down

   Turn off the tractor, relieve all hydraulic pressure by cycling the remote levers/buttons, and disconnect the negative battery cable.

2. 2

   Clean the Area

   Thoroughly clean the area around the external hydraulic valve stack to prevent dirt from entering the hydraulic system.

3. 3

   Address Wiring (If Applicable)

   If the diagnostic checks revealed a corroded connector, clean the pins with contact cleaner and apply dielectric grease. Reconnect and test.

4. 4

   Replace the Valve/Solenoid

   If the wiring is intact, the valve solenoid or the valve body itself has failed. Disconnect the hydraulic lines attached to Valve 4 (cap them to prevent fluid loss). Remove the mounting bolts securing Valve 4 to the valve stack/lift cover. Install the new external hydraulic valve/solenoid assembly, ensuring all O-rings are properly seated. Torque the mounting bolts to OEM specifications and reconnect the hydraulic lines and electrical harness.

5. 5

   Clear Codes and Test

   Reconnect the battery. Top off the hydraulic fluid if any was lost. Use a diagnostic tool to clear the DTCs, then start the tractor and test the 4th remote for proper operation and leak-free performance.