Great Plains 2000 Operator Manual - Manual (Page 20)

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Section 3 Adjustments
2012-03-27 12, 15 and 20 Foot Series Three-Point Drills 118-389M-A
Great Plains Mfg., Inc.
3. Position Seed-Cup Doors
For wheat and other small seeds, move seed-cup-
door handles to the highest position. For soybeans
and other large seeds, lower handles to the second
position. If excessive seed cracking occurs, lower
handles to the third position. For seed-cup clean out,
move handles to the fourth, wide-open position. Make
sure all handles are in the same position before drill-
ing.
Figure 3-10
Seed-Cup-Door Handle
4. Check Seeding Rate
a. Record weight of an empty container large
enough to hold seed metered for one acre.
b. Place several pounds of seed over three seed
cups on an outside end of drill box. Pull seed
tubes off these three openers.
c. Raise drill off the ground. If using a hitch, insert
transport lock pins or turn 90˚ hydraulic lock valve,
depending on hitch style.
d. Turn drive gauge wheel a few turns to fill cups with
seed. Turn wheel until seed drops to the ground
from all three cups.
e. Place a container under the three seed tubes to
gather seed as it is metered.
f. Turn drive gauge wheel for one acre (450 rota-
tions on a 12-foot drill, 364 rotations on a 15-foot
drill, or 283 rotations on a 20-foot drill). Check that
the three seed cups have plenty of seed coming
into them.
g. Weigh the metered seed. Subtract initial weight of
the empty container. Divide by three for the
amount metered by each seed cup, then multiply
by the number of drill openers for the pounds-per-
acre seeding rate. If this figure is different than de-
sired, adjust seed-rate handle and recheck the
rate.
NOTE: If your results vary greatly from the charts, you may
want to repeat the calibration procedure.
h. When drilling, note acres drilled, amount of seed
added and level of seed in drill box. If you are
seeding more or less than desired, adjust seeding
rate slightly to compensate for field conditions.
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