Massey Ferguson 0A.4X.19 – Onboard Diagnostic System (OBD): External Hydraulic Valve 4 Issue

Indicates a malfunction in the tractor's hydraulic remote system, highly likely an electrical fault such as a disconnected plug, damaged wiring harness, or a failed solenoid on the 4th rear remote spool valve.

• 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

   Use a compatible diagnostic interface device to confirm the presence of 0A.4X.19 and check for any accompanying codes (like 0A.41.FF) that might isolate the issue further.

2. 2

   Locate External Hydraulic Valve 4 at the rear remote stack and inspect the electrical connector plugging into the valve's solenoid for dirt, corrosion, or moisture.

3. 3

   Trace the wiring harness from Valve 4 back toward the ECU, looking for chafing, pinched wires, or breaks.

4. 4

   Use a multimeter to test the resistance of the solenoid coil on Valve 4 to ensure it hasn't shorted or opened.

5. 5

   Verify that the valve is receiving the correct voltage signal from the controller when the remote is activated in the cab.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to prevent electrical shorts during repair.

2. 2

   Clean the Connection

   Disconnect the wiring harness from External Hydraulic Valve 4. Clean the pins on both the solenoid and the harness connector using electrical contact cleaner.

3. 3

   Repair Wiring

   If the diagnostic checks revealed a broken wire or damaged connector, splice in a new connector or repair the wire using weather-sealed heat shrink connectors.

4. 4

   Replace Solenoid/Valve

   If the wiring is intact but the solenoid failed the resistance test, unbolt the faulty solenoid from the spool valve assembly and install a replacement. (In some sealed electro-hydraulic units, the entire valve slice may need to be replaced).

5. 5

   Reassemble and Clear Codes

   Reconnect the battery and the valve harness. Connect your diagnostic tool and clear the DTCs from the system.

6. 6

   Test

   Start the tractor and operate the 4th hydraulic remote to ensure the code does not return and the hydraulic flow is functioning correctly.