Great Plains 3N-3020P Operator Manual - Manual (Page 39)

4/23/2010 196-248M
37 Adjustments
Seeding Rate
Adjusting the seeding rate requires the following:
• adjusting drive speed range sprockets,
• adjusting transmission sprockets,
• preparing seed meters, and
• checking seeding rate.
Before setting the seeding rate, rotate the gauge
wheels. Check that seed meters, seed tubes and
drives are working properly and free from foreign
material.
Drive Speed Range Sprockets
Select the correct drive speed range sprockets for
your seed by referring to “Seed Rate Charts,” be-
ginning on page 75.
Refer to Figure 23
Loosen idler plate (1) and remove chain. Remove
Driven
Driver
1
retaining pins from shafts and install speed range
sprockets as necessary.
NOTE: Make sure the correct sprockets have
been installed in the DRIVER and DRIVEN lo-
cations 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.
Transmission Sprockets
To change the seeding rate, change the transmis-
sion sprocket combination. Refer to “Seed Rate
Charts,” beginning on page 75.
Refer to Figure 24
Loosen idler (1) and remove drive chain. Remove
lynch pins from shafts and rearrange driver and
driven sprockets as necessary.
Reroute drive chain over sprockets and idlers as
shown. Move idlers into chain so chain has #-inch
slack in its longest span. Tighten idlers and install
lynch pins.
Set the same transmission sprocket combination
on both sides of drill.
Driver
Driven
1
Figure 24
Transmission sprockets
Figure 23
Drive speed range sprockets
19113
19106