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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.
WARNING
Clear the area of other persons, pets etc. Keep children away from machinery. Walk around the machine to be sure no
one is under, on, or close to it.
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.
1003730
A
Figure 9.134: Challenger Combine Display
2.
Press HEADER CONTROL button (A). The HEADER CONTROL
screen appears. You can adjust sensitivity on this screen
using the up and down arrows.
1003732
Figure 9.135: 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.