MacDon FD75 OM - Manual (Page 99)

OPERATION
To adjust height of header, be sure the header is in Auto
Header Height Control (AHHC) mode. This is indicated by
the LED (A) being solid. The header will lower to the height
(ground pressure) corresponding to the position selected
with the height control knob (B).
Turn the knob counterclockwise for minimum ground
pressure and clockwise for maximum ground pressure.
Figure 4.92: Auto Header Height
Control Console
NOTE:
Desired ground pressure is in most cases one
number separation of the Auto Header Height
from having the header fully suspended off the
ground (A) to just sitting on the ground (B).
Figure 4.93: Float Indicator Box
Adjusting the Sensitivity of the Auto Header Height (Gleaner R65/R75)
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.
169894 85 Revision A