Great Plains 2420 Operator Manual - Manual (Page 20)

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Section 3 Adjustments
2400, 2410 and 2420 Three-Point Drill 118-706M 5/15/06
Great Plains Mfg., Inc.
To change drive sprockets, refer to Figure 3-9. Loosen
idler plate (1) and remove drive chain (2). Remove lynch
pins from shafts and rearrange driver (3) and driven (4)
sprockets as necessary.
Reroute drive chain over sprockets and idlers as shown in
Figure 3-9. Be sure chain is installed with the chain con-
nector link retainer towards the centerline and the clip
opening (split end) faces the opposite way of the chain
travel. Move idlers into chain so chain has 1/4-inch slack in
its longest span. Tighten idlers.
Figure 3-9
Driver and Driven Sprockets
Set same drive type on both drill sections.
Set Seed-Rate Handle
Position seed-rate handle for each drill box to setting indi-
cated on seed-rate chart. One handle is shown in Figure
3-10.
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.
Figure 3-10
Seed-Rate Handle
1
2
3 4
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Position Seed-Cup Doors
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.
Figure 3-11
Seed-Cup-Door Handle
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 gath-
er 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 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 add-
ed 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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