Great Plains 2420F Operator Manual - Manual (Page 37)

8/14/2006
35 Adjustments
Position Seed Cup Doors
For wheat and other smal 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 for one acre. Refer to
the chart on the next page for the exact num-
ber of tire revolutions to equal one acre.
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 mul-
tiply 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.
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.