Massey Ferguson A.40.26 – onboard diagnostic system: External Hydraulic Valve 4 Issue

The tractor's system detects a fault or potential issue with the fourth external hydraulic remote valve. This is often related to an electrical connection fault, sensor failure, or a malfunction of the valve spool itself.

• 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

   Connect a compatible diagnostic tool to confirm code 0A.40.26 and check for any accompanying codes (such as connection errors).

2. 2

   Inspect the wiring harness and electrical connectors going to External Hydraulic Valve 4 for damage, corrosion, or loose fittings.

3. 3

   Check the tractor's specific service manual for guidance on clearing error codes to see if the code returns.

4. 4

   Perform active diagnostic tests on the valve block using specialized diagnostic tools to determine if the failure is electrical or mechanical.

1. 1

   Consult service manual

   Consult the tractor's OEM service manual for the exact location and testing procedure for External Hydraulic Valve 4.

2. 2

   Repair or replace wiring

   Repair or replace the faulty wiring connection to the valve if a connection issue is found.

3. 3

   Replace valve or O-rings

   If the valve itself has failed, safely relieve hydraulic pressure and replace the External Hydraulic Valve 4 assembly or its mounting O-rings.

4. 4

   Clear DTCs and test

   Reconnect the diagnostic tool to the tractor's diagnostic port to clear the DTCs and run the system to ensure the fault does not return.