Massey Ferguson A.5X.19 – Autotronic 5 or Hydraulic/Armrest Control Module: External Hydraulic Valve 5 Issue

Malfunction in the circuit, position sensor, or mechanical operation of the number 5 auxiliary electrohydraulic spool valve. The system has detected an implausible signal, a connection problem, or a failure of the valve to return to its neutral position.

• 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

   Visual Inspection: Check the wiring harness leading to Spool Valve 5 at the rear hydraulic block. Look for rub points, frayed wires, or pinched cables.

2. 2

   Connector Integrity: Disconnect the electrical plug at Valve 5. Check for water ingress, corrosion, or pushed-out pins. Clean with contact cleaner and reconnect.

3. 3

   Electrical Testing: Test the solenoid coil resistance with a multimeter to ensure it is not open-circuit or shorted to ground. Verify that the valve is receiving proper voltage from the controller when actuated from the cab.

4. 4

   Mechanical Check: Ensure the valve is not physically jammed. If the spool position sensor reads out of range, the valve may be failing to return to the neutral position due to internal debris or a broken return spring.

1. 1

   Depressurize the System

   Turn off the tractor and cycle the hydraulic levers/controls to relieve any residual hydraulic pressure in the system.

2. 2

   Access the Valve Block

   Locate the auxiliary spool valve assembly at the rear of the tractor. Identify Valve 5 (usually the 5th slice in the stack or clearly marked on the manifold).

3. 3

   Clean the Area

   Thoroughly clean the area around the valve block to prevent dirt from entering the hydraulic system during disassembly.

4. 4

   Remove the Solenoid/Actuator

   If the diagnostic tests pointed to a failed electrical solenoid or position sensor, unbolt the electrohydraulic actuator cap from the valve slice.

5. 5

   Replace the Valve/Component

   Install the new solenoid or the complete spool valve slice (depending on whether your specific model allows for modular repair or requires a complete slice replacement).

6. 6

   Reassemble and Torque

   Reconnect the hydraulic lines and electrical harness. Torque all hydraulic unions and retaining bolts to OEM specifications.

7. 7

   Clear Codes and Calibrate

   Use a compatible diagnostic tool to clear the 0A.50.19 error code from the dashboard/control unit. Restart the engine to reactivate the valve. Test the function of Valve 5 to ensure the code does not return.