Great Plains YP3025A Operator Manual - Manual (Page 82)

78 YP3025A Table of Contents Index Great Plains Manufacturing, Inc.
401-705M Table of Contents Index 02/16/2012
Row Unit Shut-Off
Skip-row operations, such as planting from every other
row when switching from 30in twin-row to 30in single-
row, requires shutting down unused rows.
Shutting off seeding at a row involves 4 to 7 steps:
1. Identify the rows to shut off.
2. Fully close seed inlet shutter (always done).
3. Replace seed disk with blank disk (always done).
4. Close seed flow to row at Y-tube (if present).
5. Lock up row unit to reduce wear (optional).
6. Disable row clutch if equipped with optional
Swath Command™. Meter drive is not disabled on
25AP row units during shut-off.
7. Reset marker extension (if used, page 166).
8. Reset monitor active row pattern and row spacing to
avoid nuisance alarms (always done).
1. Identify Rows to Shut Off
On twin-row planters, openers are installed with short
and long opener mounts. If locking up unused rows of a
twin-row planter, shut off the rear (long mount) rows.
On single-row planters with mid-length mounts, any rows
may be locked up.
2. Close Seed Shutter
Refer to Figure 95 on page 78
Lift the handle
away from the plate. Move it to the top
position, and release the handle into the notch.
Closing the shutter prevents meter pressurization air
from leaking into the bulk seed air system, resulting in
lower pressures in adjacent rows, with risk of skips.
The shutter also stops seed flow from a row as soon as
the meter is empty. Bulk seed flow to the row falls to nil
as soon as the seed backs up to the air release vent at
the top of the meter. If the row is served by a Y-tube, the
Y-tube also needs to be shut off for the row (step 4).
3. Install Blank Disk
Refer to Figure 96
Clean out meter. See “Meter Clean-Out” on page 96.
Remove seed disk and install blank disk. See “Air-Pro®
Meter Disk Installation” on page 76.
Blank disks (part number 817-841C) are essential in row
shut-off, both to maintain consistent meter back-pressure
to meter pressurization and to prevent wear on a seed
disk.
Blank disks are engineered to simulate a seed disk with
seed in all pockets. Blanks are particularly important on
the rows with sensor lines to the pressure chamber.
2
1
Null4:
Figure 95
Seed Inlet Shutter Closed
29609
Null4:
Irregular Seeding Risk:
Always use a blank disk in a shut-off row. Operating with no
disk, or with a seed disk but no seed, destabilizes the regulated
airflow, particularly at rows with pressure sensor lines.
Figure 96
Shutter Closed, Blank Disk Installed
29610
2
1