Adjusting Ground Pressure (Gleaner R65/R66/R75/R76 And S Series) - MacDon FFT FD75 Assembly Instructions Manual

The auto header height control (AHHC) system's stability is
affected by hydraulic flow rates. Ensure that header
raise (A) and header lower (B) adjustable restrictors in
hydraulic valve block are adjusted so that it takes
approximately six seconds to raise header from ground
level to maximum height (hydraulic cylinders fully
extended), and approximately six seconds to lower header
from maximum height to ground level.
If there is too much header movement (for example,
hunting) when header is on ground, adjust lower rate to a
slower rate of drop: seven or eight seconds.
NOTE:
Make this adjustment with hydraulic system at normal
operating temperature (54.4°C [130°F]) and engine running
at full throttle.

Adjusting Ground Pressure (Gleaner R65/R66/R75/R76 and S Series)

NOTE:
Refer to 5.1.7 Gleaner S9 Series Combines, page 179
NOTE:
Changes may have been made to combine controls or display since this document was published. Refer to
combine operator's manual for updates.
To adjust header height, ensure header is in auto header
height control (AHHC) mode. This is indicated by AUTO
MODE LED light (A) displaying a continuous, solid light. The
header will lower to height (ground pressure) corresponding
to position selected with height control knob (B).
Turn knob counterclockwise for minimum ground pressure,
and clockwise for maximum ground pressure.
214325
SETTING UP AUTO HEADER HEIGHT CONTROL
for information specific to Gleaner S9 Series.
175
Figure 5.77: Header Raise and Lower
Adjustable Restrictors
Figure 5.78: Auto Header Height Control
Console
Revision A