118-365B9/9/2010
Great Plains Mfg., Inc.
5
16399
Position Seed-Cup Doors
Refer to Figure 6
For wheat and other small seeds. move the seed-cup-
door handles to the highest position. For soybeans
and other large seeds, lower the handles to the sec-
ond position. If excessive seed cracking occurs, lower
the handles to the third position. Move the handles to
the fourth, wide-open position for seed-cup clean out.
Make sure all handles are in the same position before
drilling.
Figure 6
Seed-Cup-Door Handle
Check Seeding Rate
1. Record the weight of an empty container large enough
to hold the seed metered for one acre.
2. Place several pounds of seed over three seed cups on
an outside end of the drill box. Pull the seed tubes off
these three openers.
3. Raise the drill off the ground.
4. Turn the gauge wheel a few turns to fill the cups with
seed. Turn wheel until seed drops to the ground from
all three cups.
5. Place a container under the three seed tubes to gath-
er the seed as it is metered.
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6. Turn the drive gauge wheel until one acre has been
tallied on the acremeter (200 rotations on a 27-foot
drill or 182 rotations on a 30-foot drill). Check that
the three seed cups have plenty of seed coming into
them.
7. Weigh the metered seed. Subtract the 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 desired,
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.
When satisfied with the rate, set the same seeding rate
on the opposite drill box by repeating steps 1 through 3.
Small Seeds Attachment
To calibrate the seeding rate on the optional small seeds
attachment, follow these steps.
Refer to Figure 7
1. The proper small-seeds sprocket arrangement giv-
en different drive types on the main drill box. Ar-
range the sprockets on the small-seeds attachment
according to which drive type you will use on the
main drill box.
Note: For accurate metering on the small seeds attach-
ment, the main drill box sprockets must be set to drive
type 1, 2 or 2A.
2. Set the seed-rate adjustment handle on the small
seeds attachment as indicated by the chart on
Small Seeds Attachment Seed Rate Chart, page 9.
3. Calibrate the small seeds attachment to your mate-
rial by following the steps under Check Seeding
Rate, page 5.
Figure 7
Small Seeds Sprocket Arrangements
(5 pages)
(38 pages)
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