Massey Ferguson A.6X.27 – Auxiliary Hydraulic Controller / Tractor Management System: External Hydraulic Valve 6 Issue

Malfunction in the 6th rear remote hydraulic spool valve circuit. This condition is typically triggered by an electrical fault (such as a short, open circuit, or failing spool position sensor), a calibration error, or a mechanical sticking of the valve that prevents it from reaching the commanded position.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 4700 Series
• 4707
• 4708
• 4709
• 4710
• 5600 Series
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5700SL Series
• 7600 Series
• 7614 through 7626
• 7700 Series
• 7714 through 7726S
• 8600 Series

1. 1

   Verify hydraulic fluid (UTTO) level and check if the hydraulic filter is clogged, as restricted flow can cause spool valves to throw position errors

2. 2

   Inspect External Valve 6 at the rear remote stack for visible leaks, physical damage, or heavy debris buildup that could cause the valve to jam

3. 3

   Check the wiring harness and connector going to Valve 6 for corrosion, bent pins, or broken wires

4. 4

   Perform a swap test by connecting the electrical connection/solenoid from Valve 6 to a known working valve (e.g., Valve 5). If the fault code changes to Valve 5, the solenoid or spool position sensor is faulty. If it remains A.6X.27, the issue is in the wiring harness or mechanical spool

5. 5

   Attempt to recalibrate the hydraulic valves through the tractor's diagnostic terminal to rule out software or calibration drift

1. 1

   Relieve Pressure

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

2. 2

   Clean the Area

   Thoroughly clean the rear remote valve stack with brake cleaner or a pressure washer to prevent dirt from entering the hydraulic system during disassembly.

3. 3

   Disconnect Wiring

   Disconnect the electrical harness from External Hydraulic Valve 6.

4. 4

   Remove the Valve

   Unbolt and remove the faulty spool valve section or the specific solenoid/sensor assembly from the main valve block.

5. 5

   Install New Components

   Install the replacement valve section or electrical component. Ensure all O-rings and seals are properly seated and lubricated with clean hydraulic fluid.

6. 6

   Reassemble

   Torque the mounting bolts to the manufacturer's specifications and reconnect the electrical harness.

7. 7

   Test

   Start the tractor, check for leaks around the valve stack, and verify the hydraulic fluid level.

8. 8

   Clear Codes & Calibrate

   Use a compatible diagnostic tool to clear the A.6X.27 fault code and perform a spool valve calibration so the ECU learns the new valve's parameters.