Massey Ferguson A.20.1A – Mid Mount Valve Module or Dash/Tractor ECU: External Hydraulic Valve 2 Issue

Malfunction in the second external hydraulic spool valve circuit. The underlying condition is typically an electrical or mechanical failure within the valve itself, such as a faulty spool position sensor or a sticking directional control valve.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 4707
• 4708
• 4709
• 4710
• 7714 through 7726S

1. 1

   Check UTTO hydraulic fluid level and inspect for dark color, burnt smell, or milky appearance indicating water contamination

2. 2

   Inspect the hydraulic filter to ensure it has been changed within the last 300–500 hours, as contamination can restrict flow

3. 3

   Perform a system pressure test at the rear remotes (normal is 2200–3600 psi) to verify if the issue is isolated to Valve 2

4. 4

   Inspect the wiring harness and connectors from the Dash to the Mid Mount Valve Module, checking the spool position sensor and solenoid coil for proper voltage and resistance

5. 5

   Attempt to manually actuate the valve (if equipped with a manual override) to check for mechanical binding or a stuck spool

1. 1

   Depressurize the System

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

2. 2

   Access the Valve Block

   Locate the external hydraulic valve block (typically mounted on the rear lift cover or mid-mount block depending on the loader configuration).

3. 3

   Disconnect Electricals

   Carefully unplug the wiring harness connectors from the Valve 2 solenoid and the spool position sensor.

4. 4

   Remove Hydraulic Lines

   Disconnect the hydraulic hoses and quick-release couplings from the Valve 2 slice. Cap the lines immediately to prevent contamination.

5. 5

   Unbolt the Spool Valve

   Remove the mounting bolts securing the Valve 2 'slice' to the main hydraulic manifold/base plate.

6. 6

   Install the Replacement Part

   Fit the new electric spool slice or position sensor. Ensure all O-rings and seals are properly seated.

7. 7

   Reassembly

   Bolt the valve back into the stack, reconnect the hydraulic lines, and plug in the electrical connectors.

8. 8

   Fluid and Filter

   If the fluid was contaminated, drain the system, replace the hydraulic filter, and refill with OEM-spec UTTO fluid (e.g., 10W40).

9. 9

   Calibration

   Note that new electric spool slices often need to be programmed/calibrated to the tractor's ECU using a dealer diagnostic tool.