Great Plains YP1625 Operator Manual - Manual (Page 49)

Great Plains Manufacturing, Inc. Adjustments 45
03/12/2012 401-226M-A
Setting Material Rates
Planting Rate
Adjusting the planting rate requires the following:
1. setting seed rate:
For ground-drive planters:
adjusting drive speed range sprockets, and
adjusting transmission sprockets,
For hydraulic drive planters, setting monitor and
drive controller,
2. preparing seed meters,
3. checking tire pressure.
4. checking planting rate.
Refer to Figure 55
Before setting the planting rate, run the “fill disk” function
(hydraulic drive) or rotate the contact wheel
(ground
drive). Check that seed meters, seed tubes, and drives
are working properly and free from foreign material.
Check tire pressure.
Ground Drive Planting Rate
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.
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 (6mm) slack in its long-
est 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 56
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 (6mm) slack in
its longest span. Tighten idlers and install lynch pins.
FigureSpacer:
Figure 55
Drive Speed Range
Sprockets Adjustment
21974
Note: Tire pressure matters for both ground and hydrau-
lic drive. Incorrect tire pressure causes incorrect
ground speed readout. On ground drive, incorrect
pressure causes incorrect or inconsistent seed
metering.
1
3
4
4
2
1
1
FigureSpacer:
Figure 56
Transmission
Sprockets Adjustment
21974
4
4
3
2
2 3
4
2 3
4