Great Plains 3N-3020 Material Rate - Manual (Page 3)

4/28/2004 196-366B
Great Plains Mfg., Inc. 3
Seeding Rate
Adjusting the seeding rate requires the following:
• changing drive sprockets,
• setting seed-rate handle,
• positioning seed-cup doors, and
• checking seeding rate.
Drive Speed Range Sprockets
Select the correct drive speed range sprockets for
your seed by referring to “Seed Rate Charts,” be-
ginning on page 22.
Refer to Figure 1
Loosen idler bolt (1) and remove chain. Remove
retaining pins from shafts and install speed range
sprockets as necessary.
Driven
Driver
1
NOTE: Make sure the correct sprockets have
been installed in the DRIVER and DRIVEN loca-
tions as shown.
Reroute chain over sprockets and idlers as
shown. Move idler into chain so chain has 1/4-
inch to 1/2-inch slack in its longest span. Tighten
idler and install retaining pins.
Set the same drive range sprocket combination
on both sides of drill.
For correct drive type, refer to seed-rate charts
beginning on page 22. The charts list drive types
as 1, 2, 3 or 4. Refer to Table 1 for correct sized
sprocket for each drive type.
Drive
Type
Driver
Sprocket
Driven
Sprocket
Speed
Type 1 15-tooth 60-tooth Slowest
Type 2 15- tooth 30-tooth 2 times faster than type 1
Type 3 22-tooth 30-tooth 3 times faster than type 1
Type 4 30-tooth 25-tooth 5 times faster than type 1
Table 1
Figure 1
Drive speed range sprockets
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