Great Plains YP1220 Operator Manual - Manual (Page 42)

38 YP1220 Great Plains Manufacturing, Inc.
401-506M 03/14/2012
Planting Rate
Adjusting the planting rate requires the following:
1. adjusting drive speed range sprockets, and
adjusting transmission sprockets
2. preparing seed meters,
3. checking tire pressure.
4. checking planting rate (separate procedures for sin-
gulated and volumetric seeds are found in the Seed
rate manual).
Before setting the planting rate, rotate the contact wheel.
Check that seed meters, seed tubes, and drives are
working properly and free from foreign material. Check
that tire pressure is set according to the “Specifications
and Capacities” on page 74.
Note: Contact wheel turns in opposite direction than main
ground tire.
Drive Speed Range Sprockets
Select the correct drive speed range sprockets for your
seed by referring to the “Seed Rate Charts” in the seed
rate manual.
Refer to Figure 36
Loosen idler
➀
and remove chain
➁
. Remove retaining
pins
➂
from shafts and install speed range sprockets as
necessary.
Note: Make sure the correct sprockets have been in-
stalled in the DRIVING and DRIVEN locations as
shown.
Reroute chain over sprockets and idlers as shown. Move
idler into chain so chain has
1 ⁄
4
in slack in its longest
span. Tighten idler and install lynch pins.
Transmission Sprockets
To change the planting rate, change the transmission
sprocket combination. Refer to “Seed Rate Charts” in
the seed rate manual.
Refer to Figure 37
Loosen idler
➀
and remove drive chain
➁
. Remove
lynch pins
➂
from shafts and rearrange driving and
driven sprockets as necessary.
Reroute drive chain over sprockets and idlers as shown.
Move idlers into chain so chain has
1 ⁄
4
in slack in its long-
est span. Tighten idlers and install lynch pins.
Figure 36
Drive Speed Range
Sprockets Adjustment
21974
➀
➁
➂
➂
Figure 37
Transmission
Sprockets Adjustment
21974
➀
➁
➂
➂