Great Plains 3PNG15 Material Rate - Manual (Page 7)

Great Plains Manufacturing, Inc. Main Seed Box Planting 5
12/01/2010 202-579B
Checking Main Seed Box Rate
1. Set the Drive Type and Seed Rate Handle to the
table value (or leave them at your adjusted value).
2. Record the weight of an empty container large
enough to hold seed metered from the seed box.
3. Raise drill to get drive wheel off the ground. To cali-
brate using calibration crank, attach crank to upper
jackshaft.
4. Fill three or more compartments at least 1 /
2
full of
seed in the main seed box. Pull seed hoses off open-
ers under the compartments.
Refer to Figure 7
5.
To calibrate using calibration crank, disengage
gauge wheel lockout, and attach calibration crank to
coupler on left-hand side of gauge wheel jackshaft
using retaining pin.
6. Turn gauge wheel or crank several times to fill seed
cups with seed. Continue to turn gauge wheel or
crank until seed falls to the ground from each cup.
7. Place the empty container under three seed hoses to
gather the seed as it is metered.
8. Rotate gauge wheel or calibration crank one acre, as
tallied on Acremeter, or as counted based on values
from table at right.
Note: These settings are based on 9.5L-15 tires inflated
to factory specifications.
Note: You can also rotate the gauge wheel jackshaft by
means of a wrench or socket. If rotating gauge
wheel jackshaft, disengage the lockout on the drive
wheel and use same number of rotations as for ro-
tating drive wheel.
9. Check that the three seed cups have plenty of seed
coming into them.
10. Weight metered seed. Subtract initial weight of con-
tainer. Divide by three.
11. Multiply by the number of openers on the drill to
determine total pounds seeded per acre. If this figure
is different than desired, change your rate handle
and drive type accordingly.
Note: You may want to repeat the calibration proce-
dure if your results vary greatly from seed rate
chart.
Figure 7
3PNG Calibration Crank
and Native Grass Sprockets
23467
Revolutions for One Acre
3PNG12 3PNG15
Crank: Drive Type 1 302 245
Crank: Drive Type 1A 621 502
Crank: Drive Type 2 99 80
Crank: Drive Type 2A 203 164
Gauge Wheel 450 364
MeasuredSeed EmptyContainer –
3
-------------------------------------------------------------------------------------------- PoundsPerSeedCup =
undsPerSeedCup NumberOfOpeners × PoundsPerAc =
Total Row Units
Model Spacing Rows
3PNG12-1410 10 inch 14
3PNG12-1975 7.5 inch 19
3PNG15-1810 10 inch 18
3PNG15-2475 7.5 inch 24