YP625PD
Adjustments
39
06/12/2019
401-754M
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).
One of the factors that affects seed pickup at the disk is
having an optimal seed pool (page 54). The depth of the
seed pool is controlled by the seed inlet shutter .
Each Seed Rate chart specifies a suggested initial
shutter setting. See “
page 53 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
6. Rate: Meter Pressurization
(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 31).
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 30). See “
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.
Null4:
Figure 31
Seed Inlet Shutter: Setting III
29607
5
Null4:
Figure 32
Meter Pressure Gauge
29842