MacDon R80 Rotary Disc - Manual (Page 26)

OPERATION
Form # 169089
24
Model Year - 2009
6.12.5 Roll Gap
Steel rolls "condition" the crop by crimping and
crushing the stem in several places. This allows
moisture release for quicker drying. The degree
to which the crop is conditioned as it passes
through the rolls is controlled by roll gap. See
illustration. The gap is factory set at 1/4 inch (6
mm).
Correct conditioning of alfalfa, clover and other
legumes is usually indicated when 90% of the
stems show cracking, but no more than 5% of
the leaves are damaged. Set enough roll gap to
achieve this result.
A larger gap (up to 1 inch (25 mm)) may be
desirable in thick stemmed cane-type crops;
however, too large a gap may cause feeding
problems.
Grass type crops may require less gap for
proper feeding and conditioning.
6.12.5.1 Roll Gap Adjustment
To adjust the roll gap, refer to following
illustration and proceed as follows:
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.
a. Lower header fully.
b. Loosen and back-off upper jam nut (A), both
sides of conditioner.
c. To increase roll gap, turn both lower nuts (B)
clockwise.
NOTE
The amount of thread protruding through
jam nut indicates roll gap. Factory setting
is 0.25 in. (6 mm).
NOTE
When adjusting roll gap, be sure that the
thread protruding is the same on both
sides of the conditioner roll to achieve a
consistent gap across the rolls.
d. To decrease the roll gap, turn lower nuts (B)
counter-clockwise.
e. Tighten jam nuts (A), both sides.
(continued next page)
ROLL GAP
CROP
0.25 in. (6 mm)
A
B