Great Plains 2420 Material Rate - Manual (Page 4)

118-706B 3/1/2004
Great Plains Mfg., Inc. 4
Set Seed-Rate Handle
Refer to Figure 3
Position seed-rate handle for each drill box to setting
indicated on seed-rate chart. One handle is shown.
To adjust seed-rate handle, loosen wing nut under
handle. Slide handle until indicator is just past the
correct setting, then move the handle back down to
the correct setting. Retighten wing nut.
Position Seed-Cup Doors
Refer to Figure 4
For wheat and other small seeds, move seed-cup-
door handles to highest position. For soybeans and
other large seeds, lower handles to second position.
If excessive seed cracking occurs, lower handles to
third position. For seed-cup clean out, move handles
to fourth, wide-open position. Make sure all handles
are in same position before drilling.
Check Seeding Rate
1.
Record the weight of an empty container large
enough to hold seed metered for one acre.
2. Place several pounds of seed over three seed
cups on an outside end of drill box. Pull seed
tubes off these three openers.
3. Raise drill off ground.
4. Turn gauge wheel a few turns to fill cups with
seed. Turn wheel until seed drops to ground
from all three cups.
5. Place a container under the three seed tubes to
gather seed as it is metered.
6. Turn drive gauge wheel 233 revolutions. Check
that three seed cups have plenty of seed coming
into them.
7. Weigh metered seed. Subtract initial weight of
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 the seed-rate handle and recheck
the rate.
NOTE: If your results vary greatly from the charts,
you may want to repeat the calibration procedure.
8. 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 your field
conditions.
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Figure 3
Seed Rate Handle
Figure 4
Seed-Cup Door