Massey Ferguson 0B.00.18 – Mid Mount Valve Module: Issue With Spool Position Sensor Value

The electronic control system is receiving an out-of-range, erratic, or missing voltage signal from the sensor that monitors the physical stroke/position of the hydraulic spool valve.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 5600 Series iT4
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 4700 Series
• 5700 Series
• 6700 Series
• 7600 Series
• 7700 Series

1. 1

   Inspect the wiring harness and connectors at the mid-mount valve block for open circuits, corrosion, or damaged pins.

2. 2

   Perform a sensor voltage test: verify the 5V reference supply. The signal voltage should read approximately 2.5V (± 0.2V) in neutral and scale smoothly between 0.5V and 4.5V as the spool moves.

3. 3

   Check for contaminated hydraulic oil or blocked transmission/hydraulic filters, which can cause a stuck spool and trigger sensor value errors.

1. 1

   Depressurize the System

   Turn off the tractor and cycle the hydraulic joystick/controls to relieve all residual hydraulic pressure in the mid-mount valve block.

2. 2

   Locate the Sensor

   Locate the mid-mount electro-hydraulic valve block (often located under the right-hand side of the cab or near the front axle depending on the loader prep).

3. 3

   Remove the Sensor

   Disconnect the electrical harness plug from the spool position sensor. Unbolt/unscrew the sensor from the spool valve housing.

4. 4

   Inspect the Spool

   Manually verify that the spool valve itself moves freely and is not physically jammed by debris. (If the valve is leaking or sticking, a spool valve repair kit may be required).

5. 5

   Install the New Sensor

   Fit the replacement spool position sensor and torque to OEM specifications. Reconnect the wiring harness.

6. 6

   Calibrate the Valves

   After replacing the sensor, you must perform a valve calibration via the tractor's dash or diagnostic tool. (Failure to calibrate will likely trigger related codes 0B.00.22 or 0B.00.23: "Issue With Calibration OF Valves").