Great Plains 1007NT Material Rate - Manual (Page 5)

Great Plains Mfg., Inc.
3
07/08/2009 150-290B
Main Seed Box Seed Rate
Accurately obtaining the desired seed population
requires four steps:
1. Setting Drive Type gearbox (from chart)
2. Setting initial Seed Rate Handle (from chart)
3. Positioning Seed Cup Door (by seed type)
4. Calibration: checking predicted seeding rate
Main box seed rate charts begin on page 8. The charts
list proper Drive Type 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, and average soil
conditions. Many factors affect seeding rates including
foreign material, seed treatment, seed size, seed weight
and extreme field conditions.
Use the charts only as a starting point. Minor adjust-
ments are commonly required. Set and check the seed-
ing rate using the procedures following, then readjust the
rate as necessary.
Setting Drive Type
If your drill has a Native Grass seed box, it has two gear-
boxes. The left gearbox is for the main seed box.
Refer to Figure 2
Drive Type is determined by the handle on the gearbox
cover at left front of the drill.
For correct Drive Type, refer to the charts in the Seed
Rate manual. The charts list Drive Types as 1, 2, 3 or 4.
Each Drive Type corresponds to a specific gear ratio.
Drive Type Relative Speed
1 Slowest
2 2.06 times faster than Type 1
3 3.08 times faster than Type 1
4 5.03 times faster than Type 1
Figure 2
Main Box Drive Type Gearbox
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