MacDon R85 Rotary Disc 13 Foot - Manual (Page 51)

OPERATION
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Revision C
6.12.1 Header Float
Header float springs are normally set so
95–105 lbf (426–471 N) is required to lift either
end of the header just off the ground. In rough
or stony conditions, it may be desirable to
maintain a lower force to protect cutting
components.
NOTE
When float setting is light, it may be
necessary to use a slower ground speed
to avoid excessive bouncing, and leaving
a ragged cut.
6.12.1.1 Float Adjustment
IMPORTANT
Float setting (or lifting force) MUST be
equal on both ends of the header. Left
and right ends require different spring
lengths to achieve equal float at both
ends.
a. Center mower conditioner directly behind the
tractor.
b. Raise header fully, shut off engine, and remove
key.
DANGER
Stop engine, and remove key from ignition
before leaving Operator's seat for any
reason. A child or even a pet could engage
an idling machine.
WARNING
To avoid bodily injury or death from
unexpected start-up or fall of raised
machine: stop engine, remove key, and
engage lift cylinder lock-out valves before
going under machine.
c. Close lift cylinder lock-out valves (A).
d. Back jam nut (B) away from spring.
e. To increase float, turn adjuster bolt (C)
CLOCKWISE (further into spring).
f. To decrease float, turn adjuster bolt (C)
COUNTERCLOCKWISE (out of spring).
g. Tighten jam nut (B) against spring insert to
secure the setting.
h. Open lock-out valves (A).
i. Lower header, and check header float at each
end.
NOTE
Other operating variable adjustments may
affect float setting.
Check the float, and re-adjust if necessary
after adjusting cutting height or header
angle.
Also, if using a tractor with drawbar height
different than 16 inches (406 mm), float
will be affected. Adjust as required.
B
C
A