Massey Ferguson A.20.25 – Mid Mount Valve Module or Dash/ECU: External Hydraulic Valve 2 Issue

Malfunction within the circuit of the second external hydraulic spool valve (remote valve). The underlying condition is typically an electrical connection problem, an out-of-range spool position sensor value, or a mechanical issue such as the valve sticking or jamming due to internal wear or contaminated hydraulic fluid.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Inspect the hydraulic fluid level and condition. Check for dirty oil or a blocked hydraulic/transmission filter, which is a leading cause of sticking spool valves.

2. 2

   Visually inspect the external valve body (Spool Valve 2) on the rear hydraulic block for visible leaks or physical damage.

3. 3

   Inspect the wiring harness and connectors going to External Hydraulic Valve 2. Look for corrosion, loose pins, or damaged wires.

4. 4

   Use a compatible diagnostic tool to monitor the spool position sensor value. If the value is erratic or out of range, the sensor or the electric slice itself is faulty.

5. 5

   Manually actuate the spool valve to test if it is mechanically sticking or jamming due to debris.

1. 1

   Depressurize the System

   Park the tractor on a level surface, lower all implements, turn off the engine, and cycle the hydraulic levers to relieve all hydraulic pressure in the system.

2. 2

   Locate the Valve

   Identify External Hydraulic Valve 2 on the rear hydraulic control block.

3. 3

   Disconnect Wiring

   Carefully disconnect the electrical harness connector from the valve's solenoid and position sensor.

4. 4

   Remove the Valve

   Unbolt the spool valve assembly (electric slice) from the hydraulic block. Have a catch pan ready to collect residual hydraulic fluid.

5. 5

   Inspect and Clean

   Inspect the valve for internal wear, debris, or damaged O-rings. Clean the valve body thoroughly.

6. 6

   Replace Components

   If the valve is mechanically jammed or the electronic position sensor has failed, replace the entire electric spool slice assembly.

7. 7

   Reinstall

   Install the new or cleaned valve using new O-rings/seals. Torque the mounting bolts to the manufacturer's specifications.

8. 8

   Reconnect and Refill

   Reconnect the electrical harness and top up the hydraulic fluid to the correct level.

9. 9

   Calibrate and Clear

   Start the tractor, test the operation of the remote hydraulics, and check for leaks. Use a diagnostic tool to clear the A.20.25 fault code. Note: New electric spool slices often need to be programmed/calibrated to the tractor's ECU after installation.