Massey Ferguson A.30.28 – Hydraulic Control Module / Auxiliary Valve Controller: External Hydraulic Valve 3 Issue

A malfunction in the circuit or operation of the tractor's third auxiliary hydraulic spool valve, typically indicating an electrical fault such as an open circuit, a short to ground, a solenoid failure, or a sensor signal mismatch.

• 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

   Visually inspect the solenoid connector for Valve 3 for corrosion, damaged pins, or poor fitment.

2. 2

   Inspect the wiring harness leading to the valve for rub points, stretched wires, or vibration damage.

3. 3

   Confirm the 5V reference supply voltage and ground integrity at the sensor/connector.

4. 4

   Test the solenoid coil resistance to ensure it is within OEM specifications (not open or shorted).

5. 5

   Check the signal sweep from the valve controls (levers/buttons) to ensure a smooth voltage change with no dropouts.

6. 6

   Inspect the physical valve linkage for binding or damage that might prevent the spool from moving freely.

1. 1

   Resolve Wiring Issues

   If the diagnostic checks reveal a short, open circuit, or bad ground, repair the affected section of the wiring harness or replace the damaged connector. Clear the code and retest.

2. 2

   Replace the Solenoid/Valve

   If the wiring is intact but the solenoid fails the resistance test or the valve is internally sticking/binding, replace the External Hydraulic Valve 3 assembly (or just the solenoid coil if available separately for your specific model).

3. 3

   Calibrate the System

   After replacing the valve or repairing the circuit, you must run a hydraulic valve calibration procedure using the tractor's onboard terminal or a compatible diagnostic scan tool to sync the new valve limits with the ECU.

4. 4

   Clear Codes

   Clear the 0A.30.28 DTC from the system and operate the #3 auxiliary remote to verify the repair.