Massey Ferguson 0A.13.28 – Hydraulic Valve Module: External Hydraulic Valve 1 Issue

A malfunction in the first external hydraulic remote valve (spool valve) circuit, typically caused by an electrical connection problem to the hydraulic valve, a failure of the spool valve position sensor, or a communication error regarding the spool position sensor value.

• 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 and electrical connectors leading to External Hydraulic Valve 1 (located on the rear remote stack or mid-mount block) for corrosion, bent pins, or wire chafing.

2. 2

   Use a compatible Massey Ferguson diagnostic tool to read the live data from the spool position sensor. Check if the sensor value changes smoothly when the valve is commanded to move.

3. 3

   Verify that there is active CAN communication between the Dash and the Valve Module.

4. 4

   Ensure the spool valve is not physically binding due to debris or internal hydraulic failure.

1. 1

   Depressurize the System

   Turn off the tractor, lower all implements to the ground, and cycle the hydraulic controls to relieve any residual hydraulic pressure.

2. 2

   Locate the Valve

   Identify External Hydraulic Valve 1 in the remote valve stack.

3. 3

   Clean and Re-seat Connectors

   Disconnect the electrical harness to the valve's solenoid and position sensor. Clean the contacts with electrical contact cleaner, apply dielectric grease, and re-seat the connector. Clear the code to see if it returns.

4. 4

   Replace the Sensor/Switch

   If the code persists and live data shows erratic spool position values, remove the electric spool valve control switch/sensor assembly from the valve body.

5. 5

   Install New Components

   Install the replacement sensor or solenoid. If the valve body itself is internally damaged or scored, the entire spool valve section may need to be replaced.

6. 6

   Clear Codes and Calibrate

   Reconnect the battery, top off any lost hydraulic fluid, and use a diagnostic tool to clear the 0A.13.28 DTC. Run a hydraulic valve calibration procedure if required by the specific model's service manual.