MacDon FD75 OM - Manual (Page 96)

OPERATION
2. Momentarily press the down button (A) on the control
handle. The AHHC light should change from flashing to
solid. The header should also drop toward the ground. The
Auto Header Height control is now working and active and
can be adjusted for height and sensitivity.
Figure 4.88: Control Handle
Calibrating the Auto Header Height System (Gleaner R65/R75)
Calibration should be done on flat, level ground without the header clutches engaged. Header height and header
tilt must not be in auto or standby modes. The engine rpm must also be above 2000 rpm. The Header Tilt option
on 2004, and prior combines does not work with MacDon headers. This system will have to be removed, and
disabled in order to calibrate the Auto Header Height. Refer to combine 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.
Figure 4.89: Combine Auto Header Height Controls
A - AUTO MODE Button B - AHHC Light C - CAL1 Button
D - Raise Header E - Lower Header F - Auto Mode
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