OPERATION
13. Continue pushing down on the wrench until
indicator (A) reaches a maximum reading, and begins
to decrease. Note the maximum reading. Repeat at
opposite side.
14. Use the following table as a guide f or float settings:
• If reading on wrench is high, the header is heavy.
• If reading on wrench is low, the header is light.
Table 3.4 Float Settings
Torque Settings
Header Size
Cuttingonthe
Ground
Cutting off the
Ground
30 and 35 ft
.
1-1/2to2 2to2-1/2
40 and 45 ft. 2 to 2-1/2 2-1/2 to 3
Figure 3.44: Indicator
15. To increase float (
decrease header weight), turn
bolts (A) and (B)
clockwise.
NOTE:
Loosen jam nuts on adjuster bolts before
adjusting, and retigh ten once complete.
16. To decrease float (increase header weight), turn
bolts (A) and (B) counterclockwise.
NOTE:
Loosen jam nuts on adjuster bolts before
adjusting, and retigh ten once complete.
Figure 3.45: Float Adjustment
A - Left-Side Adjustment B - Right-Side Adjustment
17. Use the following guidelines when adjusting float:
• Adjust t he float so the wrench readings are equal at both sides.
• For 40- and 45-foot double-knife headers: adjust the float so the wrench readings are equal at 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.
• Set header float as light as possible without causing excessive bouncing to avoid frequent breakage of knife
components, scooping soil, or soil build-up at cutterbar in wet conditions.
• Useaslowergroundspeedwithalightfl oat setting, if necessary, to avoid excessive bouncing and leaving a
ragged cut.
• U s e th e stab ilize r wh e els in conjunction with header float to minimize bouncing at the header ends, and to
control cut height when cutting off the ground. Refer to 3.7.1 Cutting Height, page 52 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 refer to the parts catalog for ordering information.
147695 62 Revision A
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