Great Plains 3000 Material Rate - Manual (Page 3)

9/9/2010 118-365B
Great Plains Mfg., Inc. 3
Seeding Rate
Calibrating the seeding rate requires four steps: arranging
the drive sprockets, setting the seed-rate adjustment han-
dle, positioning the seed-cup door, and checking the
seeding rate.
Refer to the seed-rate charts starting on page 6. These
charts list the proper sprocket sizes and seed-rate-handle
settings for various seeds and seeding rates.
The seed-rate charts are based on cleaned, untreated
seed of average size and test weight. The rates are based
on 9.5L x 15 rib implement tires. Many factors will affect
seeding rates including foreign material, seed treatment,
seed size, field conditions, tire pressure and test weight.
Minor adjustments likely will be needed. Set and check
the seeding rate using the procedures below, then re-ad-
just the rate as necessary.
Before setting the seeding rate, rotate the drive gauge
wheel to see that seed cups and drive are working prop-
erly and free from foreign material.
Change Drive Sprockets
Refer to Figure 1
Refer to the seed-rate charts for the correct drive
type–1, 1A, 2 or 2A.
To change the drive type
Refer to Figure 2
1. Loosen the idler-arm bolts and remove chains.
2. To change the double speed-change sprocket, re-
move nut and turn sprocket over.
Idler
Idler
Spr
oc
ket
16409
16400
Figure 1
Drive Types
Figure 2
Double Speed-Change Sprocket