Massey Ferguson 0A.4X.18 – Main Vehicle/Hydraulic Control ECU: External Hydraulic Valve 4 Issue

Connection problem or electrical fault on a specific hydraulic remote valve. The control system has detected an open circuit, short circuit, or lack of communication with the solenoid/actuator controlling the #4 rear external hydraulic spool valve.

• 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

   Visual Inspection of Valve 4: Locate the rear hydraulic remote stack at the back of the tractor and identify Valve 4.

2. 2

   Wiring and Connector Check: Inspect the electrical harness plugging into the Valve 4 solenoid for frayed wires, pinched harnesses, or corrosion inside the connector pins.

3. 3

   Swap Test: Swap the electrical connector from Valve 3 to Valve 4 to isolate whether the issue is the valve solenoid or the tractor's wiring harness/ECU.

4. 4

   Hydraulic Fluid & Filter Check: Ensure the UTTO (Universal Tractor Transmission Oil) is at the correct level and the hydraulic filters are not clogged.

1. 1

   Depressurize the System

   Turn off the tractor and cycle the hydraulic remote levers/buttons to relieve any residual hydraulic pressure in the system.

2. 2

   Clean the Area

   Thoroughly clean the rear remote valve stack to prevent dirt from entering the hydraulic system during repair.

3. 3

   Address the Connection (If Wiring Fault)

   If the diagnostic check revealed a loose or corroded connector, clean the pins with electronic contact cleaner, apply dielectric grease, and securely reconnect it. Clear the code using a compatible diagnostic tool to see if it returns.

4. 4

   Replace the Solenoid/Valve (If Component Fault)

   Disconnect the electrical harness from Valve 4. Unbolt the faulty electronic spool valve/solenoid assembly from the hydraulic stack. Remove the old O-rings from the mating surface. Lubricate the new O-rings with clean hydraulic fluid and install them on the new valve. Bolt the new valve into the stack, torqueing to OEM specifications. Reconnect the electrical harness.

5. 5

   Test and Clear Codes

   Top off the hydraulic fluid if any was lost. Start the tractor, clear the DTCs via the diagnostic interface, and actuate Valve 4 to ensure proper operation without throwing a new code.