MacDon FD75, Operator'S Manual

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64
Revision B
1019192
A
Figure 3.44: Indicator
12. Push down on the wrench until indicator (A) reaches a
maximum reading and then begins to decrease. Note the
maximum reading and repeat at the opposite side.
13. Use the following table as a guide for float settings:
•
If the reading on the wrench is high, the header is heavy
•
If the reading on the wrench is low, the header is light
Table 3.6 Float Settings
Header Size
Torque Settings
Cutting on Ground Cutting off Ground
6.1, 7.6, 9.1 and 10.7 m
(20, 25, 30, and 35 ft.)
1-1/2 to 2 2 to 2-1/2
12.2 and 13.7 m
(40 and 45 ft.)
2 to 2-1/2 2-1/2 to 3
1001641
A
B
Figure 3.45: Float Adjustment
14. To increase the float (decrease the header weight), follow
these steps:
a. Loosen the jam nuts.
b. Turn left adjustment bolts (A) and right adjustment
bolts (B) clockwise.
c. Tighten the jam nuts.
15. To decrease the float (increase header weight), follow
these steps:
a. Loosen the jam nuts.
b. Turn left adjustment bolts (A) and right adjustment
bolts (B) counterclockwise.
c. Tighten jam nuts.
16. Use the following guidelines when adjusting the float:
a. Adjust the float so the wrench readings are equal on both sides of the header.
b. For 12.2 and 13.7 m (40 and 45 ft.) double-knife headers adjust the float so that the wrench readings are equal on
both sides of the header, and then loosen both of the right spring bolts two turns.
c. Turn each bolt pair equally. Refer to Step 3.7.1 Cutting Height, page 54 , and repeat the torque wrench reading
procedure.
NOTE:
If the adequate header float cannot be achieved using all of available adjustments, an optional heavy-duty spring is
available. See your MacDon Dealer or refer to parts catalog for ordering information.
OPERATION