Meter Pressurization
Great Plains Manufacturing, Inc.
7
05/16/2019
403-942M
Meter Pressurization
Note: These are suggested initial (starting) pressures.
Higher or lower pressure adjustments can be
expected to maximize singulation.
Initial Meter Pressurization: Cotton
1.5 inches of water (any seed density)
Initial seed inlet Shutter: 3
Initial Meter Pressurization: Milo
1.5 inches of water (all disk, any seed density)
Initial seed inlet Shutter: 3
Initial Meter Pressurization: Soybeans
2.0 inches of water (84 cell disk, any seed density)
3.0 inches of water (168 cell disk, any seed density)
Initial seed inlet Shutter: 3
Initial Meter Pressurization: Sunflowers
817-851C Sunflower Oil Large
8500 seeds/pound (or fewer)
8500-7000 s/lb 1.25 inches of water
7000-5500 s/lb 1.75 inches of water
5500 s/lb and fewer 2.25 inches of water
Adjust pressure as needed to achieve desired population.
Initial seed inlet Shutter: 4
Null4:
Initial Meter Pressurization: Round Corn
Reading a Corn Pressure Chart
1. Pick the chart based on seed shape (flat, round).
Example: large round corn
2. Pick a line based on seed size (large, small).
Example: the right line below
3. Find the seed density on the bottom scale.
Example: 1260 seeds/pound
4. Read the suggested starting pressure on the left
scale, where the line (example shown as dotted
gray) intersects the density.
Example: 3.4 inches of water
Initial seed inlet Shutter for corn is: 5
29725
(
y
)
Pressure/Seed Comparison
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
900
1100
1300
1500
1700
1900
2100
2300
2500
2700
2900
3100
Seeds Per Pound
Unit Weight (80K)
Linear (Round Corn Large)
Linear (Round Corn Small)
Meter Pressure (in/w
a
ter)
5
4.5
3.5
3
2.5
2
1.5
1
0.5
0
88.9
72.7
61.5
53.3
47.1
42.1
38.1
34.8
32.0
29.6
27.6
25.8
4
817-794C & 817-796C
Round Corn-Large
817-795C & 817-797C
Round Corn-Small
Meter Pressure (in/w
a
ter)
Disks
Disks
Example
Example
Null4:
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M
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Null4:
29725
