Great Plains EWNT7 1523Q-1630Q Operator Manual - Manual (Page 14)

EWNT7 and EWNT10 End Wheel No Till Drill 150-082M-A 4/25/06 12 Great Plains Mfg., Inc.
Section 4 Adjustments
Seeding Rate
Calibrating the seeding rate requires four steps: arrang-
ing the drive sprockets, setting the seed-rate handle, po-
sitioning the seed-cup door, and checking the seeding
rate.
Refer to the seed-rate charts starting on page 14. These
charts list the proper sprocket sizes and seed-rate-han-
dle settings 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 9.0 x 24 rib implement tires. Many factors will
affect seeding rates including foreign material, seed
treatment, 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 adjust the rate as necessary.
Change Drive Sprockets
Refer to the seed-rate charts for the correct drive type–
1, 1A, 2 or 2A. Figure 4-3 shows the sprocket arrange-
ment for each drive type.
Drive Types
Figure 4-3
To change the drive types:
1. Refer to Figure 4-4. Loosen the nut (1) holding the
idler arm (2). Turn arm so chain is slack. Remove
chain from sprockets.
2. Rearrange sprockets (3) and plastic spacers (4) on
the front shaft so the correct front and rear sprockets
are aligned according to the drive type.
Drive-Type Ratios
Type 2 is Slowest
Type 2A is Two Times Faster Than Type 2
Type 1 is Three Times Faster Than Type 2
Type 1A is Five Times Faster Than Type 2
Type 2 Type 2A
Type 1 Type 1A
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a. Pull spacers off shaft.
b. Slide sprockets as necessary.
c. Place plastic dividers back on shaft between
sprockets as necessary.
5. Slide idlers on idler arms so they are aligned with
correct sprockets. Reinstall chain.
6. Turn idler arm as indicated by drive type to remove
slack from chain. Retighten nut that holds idler arm.
Sprocket Box
Figure 4-4
Set Seed-Rate Handle
The position the handle (shown in Figure 4-5) to the set-
ting indicated on the chart. To adjust, loosen the wing nut
under the handle. Slide handle until the indicator lines up
with the correct setting.
Seed-Rate Handle
Figure 4-5
Position Seed-Cup Doors
Refer to Figure 4-6. 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 second position. If excessive seed cracking oc-
curs, 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.
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