Massey Ferguson A.1X.24 – Mid Mount Valve Module or Hydraulic/Transmission Control Unit: External Hydraulic Valve 1 Issue

A malfunction, restriction, or electrical fault associated with the first rear remote auxiliary hydraulic spool valve. It typically means the valve is not responding correctly to commands, is suffering from a pressure/flow issue, or has a spool position sensor/connection fault.

• 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

   Check the hydraulic fluid (UTTO) level and condition. Flush if dark, smells burnt, or looks milky (water contamination).

2. 2

   Inspect the hydraulic or transmission filter for partial blockages that could restrict flow and throw valve codes.

3. 3

   Inspect the wiring harness and electrical connections at External Hydraulic Valve 1. Look for connection problems or damaged wires leading to the spool position sensor or valve solenoids.

4. 4

   Perform a pressure test using a hydraulic gauge at the remote couplers to isolate whether the issue is a weak pump, a failing relief valve, or the spool valve itself.

5. 5

   Visually inspect for external leaks around the valve body, damaged quick couplers, or worn hoses.

1. 1

   Preparation

   Clean the front and rear of the external hydraulic valve assembly thoroughly to prevent dirt from entering the system.

2. 2

   Disconnect Linkages

   Remove the mechanical linkage, lever, or electrical actuator connections from the front of the spool.

3. 3

   Remove Rear Fittings

   Unscrew the large pipe/fitting from the rear of the valve. (If it is seized, a 6-point socket and breaker bar are recommended).

4. 4

   Extract the Spool

   Pull the pipe and valve spool out through the back of the valve body.

5. 5

   Disassemble Detent Mechanism

   Carefully unscrew the slotted plug at the rear (it is spring-loaded). Remove the spring, ball cup, and detent balls using a small magnet.

6. 6

   Inspect and Reseal

   Inspect the spool and the actuator tube for scoring or heavy wear. Replace all O-rings, backup washers, and seals using an OEM repair kit.

7. 7

   Reassembly

   Reinstall the detent balls, spring, and plug. Slide the spool back into the valve body, reattach the rear pipe, and reconnect the linkages/actuators.

8. 8

   Fluid & Filter

   Replace the hydraulic filter and top off the UTTO hydraulic fluid.

9. 9

   Clear Codes

   Use a compatible Massey Ferguson diagnostic interface tool to clear the 0A.1X.24 code and test the remote valve operation.