MacDon FlexDraper FD75 - Calibrating Auto Header Height Control - Gleaner R65;R66;R75;R76 and S Series

214323 197 Revision B
NOTE:
Changes may have been made to the combine controls or the display since this document was published. Refer to the
combine operator’s manual for updated information.
1003733
A
B
Figure 4.136: Header Raise and Lower Adjustable
Restrictors
The auto header height control (AHHC) system’s stability is
affected by the rate at which the hydraulic fluid flows through
the hydraulic system. Ensure that header raise (A) and header
lower (B) adjustable restrictors in the hydraulic valve block are
adjusted so that it takes approximately 6 seconds to raise the
header from ground level to its maximum height (with the
hydraulic cylinders fully extended), and approximately
6 seconds to lower the header from its maximum height to
ground level.
If there is too much header movement when the header is on
ground (for example, if the AHHC system seems to be
continually “hunting” for a height setting), then adjust the
lowering rate so that the header takes 7 or 8 seconds to fall.
NOTE:
Make this adjustment with the hydraulic system at its normal
operating temperature (54.4°C [130°F]) and the engine running
at full throttle.
4.12.6 Adjusting Ground Pressure – Gleaner
®
R65/R66/R75/R76 and S Series
The ground pressure settings determine the height of the header when used with the auto header height control system
(AHHC) on Gleaner
®
R65/R66/R75/R76 and non-S9 S Series combines.
NOTE:
For information specific to Gleaner
®
S9 Series combines, refer to 4.13 Gleaner
®
S9 Series Combines, page 202.
NOTE:
Changes may have been made to the combine controls or the display since this document was published. Refer to the
combine operator’s manual for the most up-to-date information.
AUTO HEADER HEIGHT CONTROL