Great Plains YP4425A Material Rate - Manual (Page 13)

Great Plains Manufacturing, Inc. Table of Contents Rate Setting Overview 9
2014-05-13 Table of Contents 401-627B
Meter Pressurization
Refer to the Operator Manual for the procedure for fine
tuning meter pressurization.
Start with pressures from below and on page 10, which
are based on crop, and for corn, seed shape and density.
Note: These are suggested initial (starting) pressures.
Use the seed monitor console to adjust them up or
down per the procedure in the YP3025A,
YP4025A and YP4425A Operator Manuals.
Corn: Reading a Pressure Chart (below, next page)
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: 3
Initial Meter Pressurization: Canola and Cotton
1.5 inches of water (any seed density)
Initial seed inlet Shutter: canola (1.5), cotton (2)
Initial Meter Pressurization: Milo
1.5 inches of water (all disk, any seed density)
Initial seed inlet Shutter: 1
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: 2
Initial Meter Pressurization: Sunflower
(see page 62 for metric seed weights)
Disk: 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 for desired population.
Initial seed inlet Shutter: 2
Initial Meter Pressurization: Volumetric
Refer to the charts beginning on page 46.
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
Meter Pressur
ization in inches of W
ater
Meter Pressur
ization in inches of W
ater
29725
Initial Meter Pressurization: Round Corn