MacDon PW8 - Calibrating Feeder House Speed (John Deere 70 Series); Calibrating Auto Header Height Control (John Deere 70 Series)

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Figure 4.159: John Deere Combine Display
8. Use scroll knob to highlight down arrow (A) and press the
check mark button to scroll through the list until 029
DATA (B) is displayed and voltage reading (C) appears on
the combine display.
9. Start the combine and fully lower the feeder house to the
ground.
NOTE:
You may need to hold the HEADER DOWN switch for a few
seconds to ensure that the feeder house is fully lowered.
10. Check the sensor reading on the monitor.
11. Raise the header so that it is just off ground and recheck
the sensor reading.
12. If the sensor voltage is not within the low and high limits shown in 4.4 Height Sensor Output Voltage Range – Combine
Requirements, page 111 , or if the range between the low and high limits is insufficient, the height sensors will need to
be adjusted. For instructions, refer to 4.4.2 Adjusting Header Height Sensor Voltage Range – Left Side, page 114 and
4.4.3 Adjusting Header Height Sensor Voltage Range – Right Side, page 114.
4.12.2 Calibrating Feeder House Speed (John Deere 70 Series)
The feeder house speed must be calibrated on your John Deere 70 series combine before the auto header height control
(AHHC) system can be calibrated.
Refer to the combine operator’s manual for instructions on how to calibrate the feeder house speed.
4.12.3 Calibrating Auto Header Height Control (John Deere 70 Series)
The auto header height control (AHHC) sensor output must be calibrated for John Deere 70 series combines, or the AHHC
feature will not work properly.
NOTE:
Changes may have been made to the combine controls or the display since this document was published. For instructions,
refer to the combine operator’s manual for updated information.
DANGER
Check to be sure all bystanders have cleared the area.
1. Start the combine.
AUTO HEADER HEIGHT CONTROL