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Calibrating the Auto Header Height Control (Gleaner R65/R66/R75/R76 and Pre-2016 S Series)
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 be above 2000 rpm. The header tilt option on 2004
and earlier model combines does not work with MacDon headers. This system will have to be removed and
disabled in order to calibrate the auto header height control (AHHC). 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.
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.
Figure 3.271: Combine Auto Header Height Controls
A - AUTO MODE Button B - AHHC Light C - CAL1 Button
D - Raise Header E - Lower Header F - AUTO Mode
G - CAL2 Button
NOTE:
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. Refer to 3.7.5
Header Angle, page 81.
1. Ensure center-link is set to D.
2. Press AUTO MODE button (A) until the AHHC light (B) is illuminated.
3. Press and hold CAL1 button (C) until you see the following lights flash: raise header (D), lower header (E), tilt
auto mode (F), and AHHC (B).
OPERATION
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