MacDon CA25 OM - Manual (Page 70)

SECTION 7. OPERATION
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Revision B
m. If reading on wrench is high, header is heavy.
If reading on wrench is low, header is light.
n. To increase float (lighten header), turn bolts
(H) and (J) clockwise.
NOTE
Loosen jam nuts on adjuster bolts
before adjusting, and re-tighten once
complete.
o. To decrease float (increase header weight),
turn bolts (H) and (J) counterclockwise.
p. Use the following guidelines when adjusting
float:
1. For Single Knife Headers: Adjust the float
so the wrench reading is equal for both
sides.
2. For 40 and 45 ft. Double Knife Headers:
Adjust the float so that torque settings are
equal for both sides, and then loosen both
right side spring bolts two turns.
3. Turn each bolt pair equal amounts. After
adjustment has been made, repeat torque
wrench reading procedure.
4. To avoid frequent breakage of sickle
components, scooping soil, or soil build-up
at cutterbar in wet conditions, header float
should be set as light as possible without
causing excessive bouncing.
5. With a light float setting, it may be
necessary to use a slower ground speed to
avoid excessive bouncing and leaving a
ragged cut.
6. The stabilizer wheels may be used in
conjunction with float to minimize bouncing
at the header ends and control cut height
when cutting off the ground. Refer to
Section 7.9.1 Cutting Height 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.
7.9.2.3 Setting Feeder House Height and
Header Angle
a. Adjust feeder house height while watching float
indicator (K) to set cutterbar down force
(normally 2 on indicator). Lower feeder house
height to increase ground pressure (decrease
float). Indicator reading will increase.
NOTE
Installation of the auto header height
controller attachment is recommended
for cutting on the ground if the
combine is equipped to interface with
it.
b. When cutting on ground, adjust header angle to
achieve desired stubble height. Header angle
indicator (L) indicates A for shallowest
angle/higher stubble, and D for steepest
angle/lower stubble.
c. Decrease header angle to minimize pushing
soil.
NOTE
Header angle and reel fore-aft position
changes do not significantly affect
header float (downforce).
LEFT SIDE FLOAT RIGHT SIDE FLOAT
J
H
K
L