Massey Ferguson A.81.29 – Chassis or Implement Control Module: External Hydraulic Valve 8 Issue

Malfunction in the circuit, solenoid, or mechanical operation of the 8th external hydraulic remote valve (spool valve) on the tractor's hydraulic valve block.

• 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

   Verify the hydraulic fluid is at the correct level and free of contamination.

2. 2

   Inspect the wiring harness and the electrical connector plugging into External Hydraulic Valve 8 (the electric spool slice). Look for corrosion, bent pins, or frayed wires.

3. 3

   Test the valve's solenoid coil for proper resistance and ensure it is receiving the correct voltage from the ECU when the remote is commanded from the cab.

4. 4

   Check for physical damage, leaks, or blockages in the hydraulic lines connected to the #8 remote.

1. 1

   Relieve Pressure

   Turn off the tractor and cycle the hydraulic controls in the cab to relieve all residual hydraulic pressure in the system.

2. 2

   Clean the Area

   Thoroughly clean the external hydraulic valve block at the rear of the tractor to prevent dirt from entering the hydraulic system during disassembly.

3. 3

   Disconnect Electronics

   Unplug the electrical harness connector from Valve 8.

4. 4

   Remove the Valve

   Unbolt the faulty spool valve/electric slice from the hydraulic valve stack. Be prepared with a catch pan, as residual hydraulic fluid will leak out.

5. 5

   Prep the Surface

   Remove old O-rings and wipe the mating surface on the valve block clean.

6. 6

   Install New Valve

   Install the replacement valve using new O-rings/seals. Torque the mounting bolts to OEM specifications.

7. 7

   Reassemble and Test

   Reconnect the electrical harness. Start the tractor, top up the hydraulic fluid, and test the #8 remote for proper operation and leak-free performance.

8. 8

   Clear Codes

   Use a compatible Massey Ferguson diagnostic tool to clear the A.81.29 / 0A.81.29 fault code from the system. (Note: Some electric spool slices may require programming/calibration to the tractor via the diagnostic tool after installation).