Great Plains YP1625A Operator Manual - Manual (Page 76)

72 YP1125A & YP1625A Table of Contents Index Great Plains Manufacturing, Inc.
401-625M Table of Contents Index 2013-08-13
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 front (short 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 71
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 92.
Remove seed disk and install blank disk. See “Air-Pro®
Meter Disk Installation” on page 70.
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 lines to the pressure chamber.
4. Close Y-Tubes
Refer to Figure 97
If any shut-off rows are served by a Y-tube, close the
valve for the branch to that row. Rotate the valve cap until
the indicator/handle is perpendicular to the tubes.
Closing the Y-tube prevents seed from entering an
unused hose, reducing waste and simplifying clean-out.
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
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2
1
Figure 97
Y-Tube Open and Closed
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