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Revision A
Setting the Sensitivity of the Auto Header Height Control (Challenger and Massey Ferguson)
The sensitivity adjustment controls the distance the cutterbar must travel up or down before the auto header height
control (AHHC) reacts and raises or lowers the feeder house. When the sensitivity is set to maximum, only small
changes in ground height are needed to cause the feeder house to raise or lower. When the sensitivity is set to
minimum, large changes in the ground height are needed to cause the feeder house to raise or lower.
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.
1.
Press the HEADER icon on the FIELD screen. The HEADER screen appears.
Figure 7.112: Challenger Combine Display
2.
Press the HEADER CONTROL button (A). The
HEADER CONTROL screen appears. You can adjust
sensitivity on this screen using the up and down arrows.
Figure 7.113: Challenger Combine Display
3.
Adjust the sensitivity to the maximum setting.
4.
Activate the AHHC, and press the HEADER LOWER
button on the control handle.
5.
Decrease the sensitivity until the feeder house remains
steady and does not bounce up and down.
NOTE:
This is the maximum sensitivity and is only an initial
setting. The final setting must be made in the field, as
the system reaction will vary with changing surfaces
and operating conditions.
NOTE:
If maximum sensitivity is not needed, a less sensitive
setting will reduce the frequency of header height
corrections and component wear. Partially opening the
accumulator valve will cushion the action of the header
lift cylinders and reduce header hunting.
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