Great Plains YP925TD Operator Manual - Manual (Page 45)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 41
02/23/2011 Table of Contents Index 401-755M
5. Rate: Seed Inlet Shutter
A consistent seed rate results from having a consistent
number of seeds (usually one) in each pocket of the
seed disk, avoiding “skips” (fewer seeds per pocket) and
“doubles” (excess seed per pocket).
Refer to Figure 28
One of the factors that affects seed pickup at the disk is
having an optimal seed pool (page 58). The depth of the
seed pool is controlled by the seed inlet shutter
.
Each Seed Rate chart specifies a suggested initial
shutter setting. See “Seed Inlet Shutter Adjustment” on
page 57 for setting details, and further adjustment.
At unused rows, set the shutter to zero/closed to prevent
loss of meter pressurization air. Install a blank disk. See
“Row Unit Shut-Off” on page 60.
6. Rate: Meter Pressurization
Refer to Figure 29
(which depicts a typical reading for some densities of corn)
A major factor that affects seed pickup at the disk is
optimal meter pressurization. Fan air holds the seed in
the disk pockets until they pass the drop brush
(page 32).
The Seed and Fertilizer Rate manual has a section with
suggested initial manifold pressures, which may be a
single value, or a graph based on seed density.
Manifold pressure is set by a combination of tractor
circuit lever and fan butterfly valve (page 31). See “Air
System Operation” on page 28.
7. Rate: Checking
Although the seed monitor reports a computed
population based on seeds sensed, only an actual furrow
check provides certainty about the actual seeding rate.
See the Seed and Fertilizer Rate manual.
Figure 28
Seed Inlet Shutter: Setting III
29607
5
5
Figure 29
Meter Pressure Gauge
29842