Draper Clinic Handout
14
Setting Auto Header Height Control
3. Unlock float handles
(below) on each side of
combine adapter. Up is
locked, down is unlocked.
4. With stabilizer wheels fully raised and header resting on
ground, slightly raise and lower combine feeder house while
monitoring the float indicator (
A
) to verify that indicator has full
range from 0 – 4 and that needle doesn’t stick.
1. Ensure that header float is properly adjusted. Reference the float adjustment section or watch float and
2. Perform a header calibration on your combine (refer to operators manual). In some cases the voltage
range will need to be adjusted on the float indicator potentiometer before the combine will calibrate. If
required, then please refer to your header operators manual for this adjustment procedure.
5. Adjust feeder house height until float needle indicates position 2. This is the recommended ground
pressure start point. In wet conditions this may need to be lighter (i.e.1.5)
6. Save float indicator position 2 on your combines auto header height control.
7. With combine parked and header completely lowered, increase combines auto header height control
sensitivity until combine feeder house begins to “hunt” or to automatically raise and lower with the combine
parked stationary. Slightly decrease sensitivity until feeder house stops “hunting”.
8. When cutting on the ground, float should range from 1-3 on indicator (
A
) above, with the auto header
height control correcting the needle back to position 2 reasonably quickly. When cutting on the ground, it is
important that AHHC maintain a range from 0.5-3 on the float indicator since this will keep float springs
properly tensioned resulting in correct header ground pressure the best terrain following performance. When
cutting off the ground using AHHC (see page 15) needle might be set to position 1 and range from 0-2.
Header Float (
A
)
Header Tilt (
B
)
MacDon auto header height control (AHHC) functions by sensing the
separation (or float) between the header and the combine adapter.
The header senses and follows the terrain by riding lightly along the
ground suspended from the combine adapter under spring tension. If
the header floats up or down off of the combine adapter following the
terrain, then AHHC will sense this and will adjust the feeder house
and combine adapter to follow the header either up or down.
Setting Auto Header Height Control:
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