John Deere 523441.3 – HCU: Condition height not setup tab on location

The header height control system has not been properly calibrated. The control unit has not learned the valid operating range of the header height sensors, preventing automatic height control functions from working correctly. A failed calibration can occur if the sensors are not adjusted properly, the wiring is damaged, or mechanical components are broken or seized.

• S550
• S660
• S670
• S680
• S690
• 9570
• 9670
• 9770
• 50 Series
• 60 Series

1. 1

   Verify that any transport locks or lock-out brackets on the sensor arms or float arms have been removed or placed in the field position

2. 2

   Inspect the header height sensor arms, linkages, and mounting points for any signs of damage, binding, or excessive movement

3. 3

   Ensure the sensor arms are not seized and can move freely through their entire range of motion (lubricate grease fittings if equipped)

4. 4

   Check the wiring harness between the combine and the header for a secure connection

5. 5

   Inspect the wiring leading to each header height sensor for damage, corrosion, or loose connections (e.g., rodent damage)

6. 6

   Verify sensor voltage through the combine's diagnostic addresses on the display (operating range is typically 0.5 to 4.5 volts, ideally set between 0.9 and 4.1 volts). If out of range, adjust the linkage connection up or down on the sensor arm.

1. 1

   Prepare combine for calibration

   Attach the header to the combine and connect the main wiring harness. Park the combine on a firm, level surface. Start the combine and bring the engine to high idle.

2. 2

   Initiate calibration

   Navigate to the calibration menu on the combine's display (e.g., CommandCenter under 'Calibrations & Procedures') and select 'Header Calibration'.

3. 3

   Perform calibration sequence

   Follow the on-screen instructions. This will include lowering the header completely to the ground, then raising it fully so the system can measure the sensor voltage at these lower and upper limits.

4. 4

   Save and tune

   Once the calibration completes successfully, save the calibration. It is recommended to then perform an 'AHC Performance Tuning' or similar fine-tuning calibration to improve system sensitivity.

5. 5

   Replace faulty sensor

   If the calibration fails and the system indicates a sensor is out of range despite adjustment, replace the faulty header height sensor.