Great Plains 2N-3020 Operator Manual - Manual (Page 23)

21
Section 3 Adjustments
2/28/08 2N-2420 and 2N-3020 Two-Section Folding No-Till Drill 196-164M-A
Great Plains Mfg., Inc.
Down-Pressure Springs
You can adjust spring down pressure individually for each
opener. This is useful for penetrating hard soil and plant-
ing in tire tracks.
To adjust spring down pressure, raise the drill. Refer to
Figure 3-4. Use a crowbar or other lever to lift the spring
plate off the pin. Remove the pin, then move the spring
plate to a new position. Replace the pin to hold the spring
plate in place, then replace plate over pin.
Figure 3-4
Opener Spring Adjustment
Figure 3-5 shows the maximum and minimum spring set-
tings.
Maximum Pressure Minimum Pressure
Figure 3-5
Opener Spring Adjustment
Press Wheels
A spring in the press-wheel mechanism creates down
pressure on the press wheels. The amount of force need-
ed to close the furrow will vary with field conditions.
To adjust, move the adjustment lever shown in Figure 3-6.
•
For more down pressure, move the handle away from
the drill.
•
For less down pressure, move the handle toward the
drill.
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Lift plate with
crowbar
Remove pin
and slide plate
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Figure 3-6
Press-Wheel Adjustment
Setting the Seeding Rate
Calibrating the seeding rate requires four steps: shifting
the speed-change gearbox, adjusting the seed-rate han-
dle, setting the seed-cup doors, and checking the seeding
rate.
Check the seed-rate charts starting on page 23 or inside
the drill boxes. These charts list the proper settings for the
speed-change gearbox and seed-rate handle for various
seeds and seeding rates.
The seed-rate charts are based on cleaned, untreated
seed of average size and test weight. The rates are based
on 11L x 15 8-ply rib implement tires. Many factors will af-
fect seeding rates including foreign material, seed treat-
ment, seed size, field conditions, tire pressure and test
weight. Minor adjustments likely will be needed. Set and
check the seeding rate using the procedures below, then
re-adjust the rate as necessary.
Before setting the seeding rate, rotate both gauge wheels
to see that the seed cups and drive are working properly
and free from foreign material.
NOTE: Each drill box has its own metering mechanism.
After adjusting and checking the rate on one box, set the
same rate on the other box.
1. Shift Speed-Change Gearbox
The speed-change gearbox, Figure 3-7, is designed
to give you a variety of speeds for different seeds and
seeding rates. You can shift between four different
drive types.
Refer to the seed-rate charts for the correct drive
type–1, 2, 3 or 4. Move the selector handle on the
gearbox until the correct number appears in the han-
dle window as shown in Figure 3-7. Rotate the tires a
few turns to confirm the gearbox has engaged.
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