Massey Ferguson 0A.80.1B – Onboard diagnostic system: External Hydraulic Valve 8 Issue

Malfunction, restriction, or failure in the circuit or mechanical operation of the 8th external hydraulic remote/spool valve. Remote hydraulics may become slow, weak, or completely dead.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Inspect the hydraulic oil filter and transmission filter for blockages that restrict oil flow

2. 2

   Check for dirty or contaminated hydraulic oil, which can cause sticky valves

3. 3

   Look for blocked, damaged, or faulty quick-release couplers and worn hydraulic hoses that could restrict flow

4. 4

   Test hydraulic pressure to check for relief valve faults or a stuck diverter valve before assuming the pump or spool valve has failed

1. 1

   Relieve Pressure & Drain Fluid

   Lower all implements. If removing the valve block, you may need to pump out or drain the hydraulic reservoir. Have a large bucket ready, as this process can be messy.

2. 2

   Disconnect Lines

   Disconnect the hydraulic hoses and quick couplers from the affected external hydraulic valve.

3. 3

   Remove the Valve

   Unbolt the external hydraulic valve assembly from its mounting position (often directly mounted on the lift cover or stacked at the rear).

4. 4

   Reseal or Replace

   If resealing (e.g., Bosch SB23 valves on CCLS/TFLS equipped tractors): Use a specialized spool valve replacement/reseal kit (like the AT20010 tool) to replace the internal seals and O-rings without having to buy a completely new valve body. If replacing: Install the new spool valve/remote valve assembly.

5. 5

   Reassemble

   Bolt the valve back onto the lift cover/stack. Reconnect all hydraulic hoses and ISO 5675 quick couplers.

6. 6

   Refill and Test

   Refill the system with clean hydraulic fluid, replace the hydraulic filter, and test the remote valve for proper pressure, flow, and leak-free operation.