Locking/unlocking header float – MacDon FD75 OM User Manual
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15. To increase float (lighten header), turn bolts (A)
and (B) clockwise.
NOTE:
Loosen jam nuts on adjuster bolts before
adjusting, and retighten once complete.
16. To decrease float (increase header weight), turn bolts
(A) and (B) counterclockwise.
Figure 4.210: Float Adjustment
A - Left Side Adjustment
B - Right Side Adjustment
17. Use the following guidelines when adjusting float:
• Adjust the float on 30-, 35- and 40-foot single-knife headers so that the wrench reading is equal at both sides.
• Adjust the float on 40- and 45-foot double-knife headers so that wrench readings are equal for both sides,
and then loosen both right side spring bolts two turns.
• Turn each bolt pair equal amounts.
After adjustment has been made, repeat torque wrench
reading procedure.
• Header float should be set as light as possible to avoid frequent breakage of knife components, scooping
soil, or soil build-up at cutterbar in wet conditions, without causing excessive bouncing.
• Use a slower ground speed if necessary with a light float setting to avoid excessive bouncing and leaving a
ragged cut.
• Use the stabilizer wheels and the float to minimize bouncing at the header ends and to control cut height
when cutting off the ground. Refer to
for details.
NOTE:
If adequate header float cannot be achieved using all of the available adjustments, an optional heavy duty
spring is available. See your MacDon Dealer or parts catalog for ordering information.
Locking/Unlocking Header Float
The function of the header float locks is to lock and unlock the header float system. There are two locks—one on
each side of the adapter.
IMPORTANT:
The float locks must be engaged when the header is being transported with the adapter attached so that
there is no relative movement between the adapter and header during transport. The float locks must also
be locked during detachment from the combine to allow the feeder house to release the adapter.
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