MacDon FD75, Operator'S Manual

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60
Revision B
3.7.2 Header Float
The header float system reduces the ground pressure at the cutterbar, allowing the header to follow the ground and
respond to sudden elevation changes or obstacles.
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A
Figure 3.34: Float Indicator
The header float is indicated on float indicator (A). Values 0 to 4
represent the force of the cutterbar on the ground, with 0 being
the minimum and 4 being the maximum.
The maximum force is determined by the tension on the
adapter
’
s adjustable float springs. The tension is factory-set, but
it can be changed to suit conditions. For instructions, refer to
Checking and Adjusting Header Float, page 60 .
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A
Figure 3.35: Cutting on the Ground
Set the float for cutting on the ground as follows:
a. Ensure the header float locks are disengaged. For
instructions refer to
Locking/Unlocking Header Float,
page 66 .
b. Lower the feeder house using the combine header
controls until float indicator (A) reaches the desired
float value (cutterbar ground force). Set the float
indicator to 2 initially and adjust as necessary.
Set the float for cutting off the ground as follows:
a. Set up the stabilizer wheels. Refer to Cutting off
Ground, page 54 .
b. Note the float value on the float indicator and maintain
this value during operation (disregard minor
fluctuations on the indicator).
Checking and Adjusting Header Float
The header is equipped with a suspension system that floats the header over the ground to compensate for ridges,
trenches, and other variations in ground contour. If the header float is not set properly, it may cause the cutterbar to push
into the ground or leave uncut crop. This procedure describes how to check the header float and adjust it to the factory-
recommended settings.
DANGER
To prevent bodily injury or death from the unexpected start-up of the machine, always stop the engine and remove the
key from the ignition before leaving the operator
’
s seat for any reason.
Use the following guidelines when adjusting the float setting:
•
Turn each adjustment bolt pair equally. Repeat the torque wrench reading procedure on both sides of the header.
•
Set the header float as light as possible (without causing excessive bouncing) to prevent knife component breakage, soil
scooping, and soil build-up at the cutterbar in wet conditions.
OPERATION