215184 428 Revision A
14. Raise the header so it is just off the ground and recheck the sensor reading.
15. If the sensor voltage is not within the low and high limits or if the range between the low and high limits is insufficient,
refer to Adjusting Voltage Limits – One-Sensor System, page 314.
Calibrating Feeder House Speed – John Deere 70 Series
The feeder house speed must be calibrated before you calibrate the auto header height control (AHHC) system. For
instructions, refer to the combine operator’s manual.
Calibrating the Auto Header Height Control – John Deere 70 Series
For best performance of the auto header height control (AHHC), perform these procedures with the center-link set to D.
When setup and calibration are complete, adjust the center-link back to desired header angle. For instructions, refer to
Header Angle in the header operator’s manual for instructions.
NOTE:
Changes may have been made to the combine controls or display since this document was published. Refer to the combine
operator’s manual for updates.
WARNING
Check to be sure all bystanders have cleared the area.
NOTE:
If header float is set too light, it can prevent calibration of AHHC. You may need to set the float heavier for calibration
procedure so header doesn’t separate from the float module.
1. Ensure center-link is set to D.
2. Rest header on down stops and unlock float.
3. Start the combine.
Figure 9.268: John Deere Combine Display
4. Press the button located fourth from the left along the top
of monitor (A) to select the icon that resembles an open
book with a wrench on it (B).
5. Press top button (A) a second time to enter diagnostics and
calibration mode.
SETTING UP AUTO HEADER HEIGHT CONTROL
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