Great Plains 3PNG15 Material Rate - Manual (Page 3)

8/17/2006 202-553B
Great Plains Mfg., Inc. 3
Seeding Rate
Calibrating the seeding rate requires four steps: arrang-
ing the drive sprockets, setting the seed-rate adjustment
handle, 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-han-
dle 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-adjust 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. Figure 8 shows the sprocket ar-
rangement for each drive type.
Figure 1
Drive Types
16400
To change the drive type
Refer to Figure 2
a. Loosen the idler-arm bolts and remove chains.
b. To change double speed-change sprocket, re-
move nut and turn sprocket over.
Figure 2
Double Speed-Change Sprocket
Refer to Figure 3
c. To change jackshaft sprocket, remove set screws
and slide sprockets so the correct-sized sprock-
ets are aligned. Reinsert set screws.
Figure 3
Jackshaft Sprocket
Idler
Idler
Spr
oc
ket
16409
16412
Refer to Figure 4
d. Shorten or lengthen chains as necessary and re-
install chains. Be sure chain is installed with chain
connector link retainer towards centerline and clip
opening (split end) is facing opposite way of chain
travel. Move idler arms into chains. See Figure 4
for correct chain slack.
Figure 4
Chain Slack
1/2 In.
3/4 In.