Massey Ferguson A.23.19 – Hydraulic Control Unit / Mid Mount Valve Module or Tractor Control Unit (TCU): External Hydraulic Valve 2 Issue

Fault within the circuit or mechanical operation of the second external hydraulic remote valve (spool valve). Triggered by an out-of-range spool position sensor value, a connection problem or open/short circuit on the hydraulic valve solenoid, or mechanical sticking/jamming of the valve spool due to debris or internal wear.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 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
• 4707
• 4708
• 4709
• 4710

1. 1

   Check the rear remote stack (Valve 2) for visible hydraulic fluid leaks, which can cause pressure drops and erratic sensor readings.

2. 2

   Inspect the wiring harness leading to the Valve 2 solenoid and spool position sensor. Look for rub points, frayed wires, or loose connections.

3. 3

   Disconnect the Valve 2 connector and check for corrosion or bent pins. Use a multimeter to test the coil resistance of the solenoid and verify ground integrity.

4. 4

   Ensure the valve isn't physically jammed by debris. Swap the electrical connections between Valve 1 and Valve 2 (if the harness allows) to see if the fault code follows the wiring or stays with the physical valve.

5. 5

   Verify that the hydraulic fluid level is correct and the hydraulic filters are not clogged, as low pressure can trigger valve faults.

1. 1

   Depressurize the System

   Turn off the tractor, lower all implements to the ground, and cycle the hydraulic levers/joystick to relieve residual hydraulic pressure. Disconnect the battery.

2. 2

   Access the Valve Block

   Locate the external hydraulic valve stack at the rear of the tractor (or mid-mount block, depending on loader configuration). Identify Valve 2.

3. 3

   Clean the Area

   Thoroughly clean the area around the valve to prevent dirt from entering the hydraulic system during disassembly.

4. 4

   Disconnect Electrical & Hydraulic Lines

   Unplug the wiring harness from the Valve 2 solenoid and position sensor. Mark and disconnect the hydraulic hoses.

5. 5

   Remove the Valve

   Unbolt the spool valve section from the main distribution block.

6. 6

   Rebuild or Replace

   If rebuilding: Disassemble the spool valve, clean the internal bore, and replace the O-rings and seals using a spool valve body kit. If replacing: Install the new spool valve assembly or the faulty solenoid/sensor.

7. 7

   Reassembly

   Bolt the valve back into the stack, torque to OEM specifications, and reconnect the hydraulic lines and electrical connectors.

8. 8

   Test and Clear Codes

   Reconnect the battery, start the tractor, and check for leaks. Use a compatible Massey Ferguson diagnostic tool to clear the A.23.19 DTC and cycle the valve to ensure proper operation.