Massey Ferguson A.33.19 – Vehicle Control Module (VCM) or Tractor Control Unit (TCU): External Hydraulic Valve 3 Issue

This code indicates a malfunction with the third rear remote hydraulic spool valve. The underlying condition is typically an electrical fault, such as a connection problem, a short/open circuit in the wiring harness, or a failure of the valve's electronic solenoid.

• 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 electrical connection at External Hydraulic Valve 3 for bent pins, moisture, or corrosion.

2. 2

   Check the wiring harness leading to the valve for continuity, chafing, breaks, or exposed wires causing a short to ground.

3. 3

   Test the solenoid coil resistance on Valve 3 using a multimeter and verify it receives correct voltage from the ECU when actuated.

4. 4

   Check hydraulic fluid level and filters, as contaminated fluid can cause the spool valve to bind mechanically.

1. 1

   Relieve Pressure

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

2. 2

   Clean the Area

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

3. 3

   Disconnect Electronics

   Unplug the electrical connector from External Hydraulic Valve 3.

4. 4

   Remove the Valve

   Unbolt the mounting hardware securing Valve 3 to the hydraulic manifold/lift cover block. Carefully separate the valve from the stack.

5. 5

   Rebuild or Replace

   If rebuilding: Remove the old O-rings and seals. Clean the spool and valve body, then install an OEM spool valve repair kit. If replacing: Prepare the new spool valve assembly.

6. 6

   Reinstallation

   Install the new O-rings between the valve and the manifold. Bolt the valve back into the stack and torque the bolts to OEM specifications.

7. 7

   Reconnect and Test

   Reconnect the electrical harness. Start the tractor, top off the hydraulic fluid if necessary, and check for leaks.

8. 8

   Clear the Code

   Use a compatible diagnostic interface tool to clear the 0A.33.19 code from the ECU and verify that the remote valve operates correctly.