Massey Ferguson A.22.26 – Mid-Mount Valve Module or Hydraulic Control Module: External Hydraulic Valve 2 Issue

Indicates a malfunction associated with the second external hydraulic remote valve (spool valve). The underlying condition is typically an electrical connection problem on the hydraulic valve, an out-of-range spool position sensor value, or a loss of communication between the dash and the valve module.

• 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 to 7726S

1. 1

   Verify the hydraulic fluid (UTTO) level and condition. Dark, burnt, or milky fluid can cause valve sticking and sensor errors.

2. 2

   Inspect External Hydraulic Valve 2 (often a Bosch Rexroth SB23 valve) for physical damage or external fluid leaks.

3. 3

   Check the wiring harness connecting the mid-mount valve module to the dash and the specific spool position sensor for Valve 2. Look for corrosion, loose pins, or frayed wires.

4. 4

   Use a hydraulic gauge to test the system pressure at the rear remotes to ensure the pump is delivering adequate flow and the relief valve is functioning.

1. 1

   Fluid and Filter Maintenance

   If the hydraulic fluid is contaminated, drain the system, replace the hydraulic filter, and refill with clean OEM-spec UTTO fluid.

2. 2

   Reseal the Valve (If Leaking)

   If the Bosch SB23 remote valve is leaking but electrically sound, do not replace the entire valve immediately. Use a specialized spool valve replacement/reseal kit to replace the internal seals.

3. 3

   Replace the Valve Section (If Electrically Failed)

   If the spool position sensor or internal solenoid has failed (causing the 0A.22.26 code), the specific distributor section for Valve 2 must be replaced.

4. 4

   Reassembly

   Install the new or resealed valve section, ensuring all O-rings are seated correctly and electrical connectors are firmly snapped into place.

5. 5

   Clear Codes

   Use a compatible Massey Ferguson diagnostic tool to clear the DTCs from the system and cycle the hydraulic remotes to verify the repair.