Massey Ferguson 0B.00.21 – Mid Mount Valve Module: Issue With Spool Position Sensor Value

The sensor responsible for monitoring the physical position of the hydraulic spool valve is sending an erratic, missing, or out-of-tolerance signal to the tractor's control system.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 4700 series (4707-4710)
• 5700SL series
• 7600 series
• 7700 series

1. 1

   Inspect the wiring harness and connectors at the Mid Mount Valve Module and the spool position sensor for open circuits, low/high amp draws, or connection problems

2. 2

   Ensure the spool valve itself is not physically jammed by debris, which would prevent it from reaching the position expected by the sensor

3. 3

   Attempt to recalibrate the mid-mount valves via the tractor's diagnostic interface before replacing hardware

1. 1

   Retrieve Codes

   Connect a Massey Ferguson-compatible diagnostic tool to verify code 0B.00.21 is active and check for accompanying mid-mount valve codes (e.g., 0B.01.XX series).

2. 2

   Access the Valve Block

   Locate the Mid Mount Electro Valve block (typically mounted on the chassis for loader control).

3. 3

   Inspect and Replace

   Disconnect the electrical connector to the spool position sensor. If wiring tests confirm the harness is good but the sensor value remains out of range, unbolt and remove the faulty spool position sensor.

4. 4

   Install New Sensor

   Fit the replacement sensor to the spool valve housing.

5. 5

   Recalibrate

   After installation, you must use the diagnostic tool to clear the DTCs and perform a valve calibration so the module learns the new sensor's parameters.