Great Plains YP1625 Operator Manual - Manual (Page 42)

38 YP1225 and 1625 Great Plains Manufacturing, Inc.
401-226M 07/09/2009
Planting Rate
Adjusting the planting rate requires the following:
1. setting seed rate:
For ground-drive planters:
checking tire brand and model
1
,
adjusting drive speed range sprockets, and
adjusting transmission sprockets,
For hydraulic drive planters, setting monitor
2. preparing seed meters,
3. checking tire pressure.
4. checking planting rate.
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 118.
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
and remove chain . Remove retaining
pins 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
and remove drive chain . Remove
lynch pins 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.
1. Ground drive seeding rate can vary as much as 5% due to tread differences. Make sure you have the latest Seed Rate manual that
provides rate tables specific to your main transport tires.
Figure 36
Drive Speed Range
Sprockets Adjustment
21974
1
3
4
4
2
1
1
Figure 37
Transmission
Sprockets Adjustment
21974
4
4
3
2
2 3
4
2 3
4