215575 157 Revision B
Figure 4.109: 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.
4.9.6 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:
Refer to 4.10 Gleaner
®
S9 Series Combines, page 161 for information specific to Gleaner
®
S9 Series combines.
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.
Figure 4.110: Auto Header Height Control Console
To adjust the header height, ensure that the header is in AHHC
mode, as indicated by AUTO MODE LED light (A) displaying a
continuous, solid light. The header will lower to the height (i.e.
the ground pressure) corresponding to the position selected
with height control knob (B).
Turn knob (B) counterclockwise to decrease the ground
pressure setting and clockwise to increase the ground pressure
setting.
AUTO HEADER HEIGHT CONTROL
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