Massey Ferguson A.41.20 – Tractor ECU or Implement/Hydraulic Control Module: External Hydraulic Valve 4 Issue

The tractor's diagnostic system has detected an electrical connection issue, pressure irregularity, or mechanical jamming specifically on the 4th external hydraulic remote valve.

• 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

   Inspect the wiring harness and electrical connector going to External Hydraulic Valve 4 for corrosion, loose pins, or frayed wires

2. 2

   Inspect the valve body and quick couplers for visible hydraulic fluid leaks, which can cause pressure drops

3. 3

   Check if the valve is sticking or jamming due to debris or internal wear

4. 4

   Check the hydraulic fluid level and condition for contamination such as metal shavings or dust

1. 1

   Retrieve and Verify

   Connect a compatible diagnostic tool to the tractor to confirm code 0A.41.20 is active.

2. 2

   Clean Connections

   Disconnect the electrical plug at External Hydraulic Valve 4. Clean the contacts with electrical contact cleaner, ensure the pins are straight, and securely reconnect the harness.

3. 3

   Address Leaks/Seals

   If the valve is leaking externally, replace the O-rings, seals, or quick couplers at the valve block.

4. 4

   Clear Debris/Flush System

   If the valve is sticking due to contamination, remove the valve spool, clean it thoroughly, and reinstall. You must also drain the contaminated hydraulic fluid and replace the hydraulic filter to prevent the issue from returning.

5. 5

   Replace the Valve

   If the electrical solenoid has failed internally or the valve body is severely worn/jammed, the External Hydraulic Valve 4 assembly must be replaced.

6. 6

   Clear and Test

   Use the diagnostic tool to clear the DTC. Start the tractor, allow the hydraulic fluid to warm up, and actuate the 4th remote to ensure the code does not return and the implement responds correctly.