Massey Ferguson 0A.43.21: External Hydraulic Valve 4 Issue

This code indicates a fault associated with the 4th external hydraulic spool valve, which is often caused by a connection problem, electrical fault, or a failure within the valve slice itself.

• 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

   Retrieve Codes: Use a compatible Massey Ferguson diagnostic tool or interface device to confirm the code and check for any secondary codes (such as 0A.41.FF, which explicitly points to a connection problem on a hydraulic valve).

2. 2

   Inspect Connections: Check the wiring harness and electrical connectors going to External Hydraulic Valve 4 for corrosion, loose pins, or damaged wires.

3. 3

   Consult Manual: Refer to the specific tractor's service manual to interpret the exact testing parameters for the spool valve solenoids.

1. 1

   Replace components

   If the wiring and connections to Valve 4 are intact, the electric spool slice or its pilot pressure control may need to be replaced.

2. 2

   Program new unit

   If an electric spool slice is replaced, the new unit must be programmed to the tractor's onboard diagnostic system by a qualified technician.