John Deere 1079 – C03: Concave Position Sensor Supply Voltage High

The supply voltage for the Concave Position Sensor is higher than the specified limit of 5.5 VDC. This indicates a potential fault in the power supply or the sensor's electrical circuit, which can lead to erratic readings and improper concave positioning.

• 9410
• 9450
• 9510
• 9540
• 9550
• 9560
• 9580
• 9610
• 9640
• 9660
• 9680
• 9660 CTS
• 9560 STS
• 9570 STS
• 9650 STS
• 9660 STS
• 9670 STS
• 9750 STS
• 9760 STS
• 9770 STS
• 9860 STS
• 9870 STS
• 9880 STS
• S550
• S650
• S660
• S670
• S680
• S690

1. 1

   Perform a visual inspection for loose or disconnected components, specifically checking for a loose sensor mounting bracket or a disengaged bolt/roll pin connecting the sensor to the actuator arm.

2. 2

   Examine the wiring harness leading to the concave position sensor for visible signs of damage, such as chafing, breaks, or corrosion on the connectors.

3. 3

   Attempt to perform the 'Concave Sensor Zero Calibration'. If the calibration fails or readings remain erratic, it indicates a hardware issue with the sensor or its circuit.

1. 1

   Replace sensor

   If diagnostics point to a faulty sensor, remove and install the new concave position sensor.

2. 2

   Prepare for calibration

   Ensure the concave and separator area are clear of crop material, then turn the key switch to the 'RUN' position.

3. 3

   Access calibration menu

   Enter the diagnostic or calibration menu on the cornerpost display and select the concave calibration option (may display as 'CAL' and 'conc').

4. 4

   Set zero position

   Follow the on-screen prompts to fully close the concave until the actuator stops. Press the calibration button to set the zero position.

5. 5

   Save and exit

   Verify the display confirms the calibration is stored, then press the enter or back button to save the value and exit calibration mode.