Massey Ferguson 0A.41.2A – Hydraulic Control Unit or Armrest Autotronic: External Hydraulic Valve 4 Issue

Indicates a malfunction, typically an electrical or connection problem, on the number 4 external hydraulic remote valve (spool valve). The system detects that the signal from the valve's position sensor or solenoid circuit is out of range, missing, or experiencing a connection failure.

• 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

   Inspect the wiring harness leading to External Hydraulic Valve 4 at the rear of the tractor for rub points, frayed wires, or physical damage.

2. 2

   Disconnect the electrical connector at the valve solenoid and check for dirt, moisture, corrosion, or bent pins.

3. 3

   Test the solenoid coil resistance with a multimeter to ensure it is within OEM specifications, and check the circuit for continuity (no open circuit, short to ground, or short to power).

4. 4

   Verify that the FingerTIP control or joystick on the armrest corresponding to Valve 4 is functioning correctly and not physically stuck.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to ensure safety while working on the electrical system.

2. 2

   Clean and Reconnect

   If the diagnostic checks revealed a dirty or loose connector, clean the contacts with electrical contact cleaner, apply dielectric grease, and securely reconnect the harness.

3. 3

   Replace Faulty Component

   If the wiring is intact but the solenoid coil fails the resistance test, or the valve position sensor is faulty, remove the retaining bolts on the Valve 4 slice in the hydraulic stack and replace the solenoid/sensor assembly (or the entire valve slice, depending on the specific model's modularity).

4. 4

   Clear the Code

   Reconnect the battery and turn the ignition on. Use a compatible diagnostic tool or the tractor's dashboard control unit to clear the 0A.41.2A error code.

5. 5

   Reactivate the Valve

   The valve affected by the error code remains locked until the system resets. Stop and re-run the engine to reactivate the valve.

6. 6

   Test Operation

   Actuate the number 4 remote using the cab controls to ensure proper hydraulic flow and verify that the code does not return.