Great Plains YP625PD Material Rate - Manual (Page 14)

12 YP625PD/TD, YP925TD Table of Contents Great Plains Manufacturing, Inc.
401-754B Table of Contents 09/29/2011
5. Rate: Seed Inlet Shutter
A consistent seed rate requires: a consistent number of
seeds (usually one) in each pocket of the seed disk;
avoiding “skips” (fewer seeds per pocket); and, avoiding
“doubles” (excess seed per pocket).
Refer to Figure 8
One of the factors that affects seed pickup at the disk is
having an optimal seed pool (see Operator manual). 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” in
Operator manual for setting details, and further
adjustment.
At unused rows, set the shutter to zero/closed to prevent
loss of meter pressurization air, and install a blank seed
disk. See the “Row Unit Shut Off” topic in the Operator
manual.
6. Rate: Meter Pressurization
Refer to Figure 9
(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.
The Seed Rate manual has a section with suggested
initial meter pressures, which may be a single value, or a
graph based on seed density.
Meter pressure is set by a combination of tractor circuit
lever and fan butterfly valve. See “Air System
Operation” in Operator manual.
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 “Checking Planting Rate” on page 8.
Null4:
Figure 8
Seed Inlet Shutter: Setting III
29607
5
5
Null4:
Figure 9
Meter Pressure Gauge
29842