Great Plains YP825A Operator Manual - Manual (Page 82)

78 YP425A, YP625A and YP825A Table of Contents Index Great Plains Manufacturing, Inc.
401-651M Table of Contents Index 2014-08-15
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.
If not locking up rows, any rows may be shut off.
2. Close Seed Shutter
Refer to Figure 95 on page 77
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.
3. Install Blank Disk
Refer to Figure 96
Clean out meter. See “Meter Clean-Out” on page 98.
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 seed
disks and minimize wear on brushes.
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.
4. Lock-Up Row
Alternate twin-row units (the rear units) can be pinned in
the up position to accommodate single-row spacing.
Refer to Figure 97
The lock-up pins
are located in a storage hole in
the row unit mount. To lock up a unit, the unit must be
raised, and the pin moved to the lock-up hole
in the
row unit shank.
Note: Lock-up pins are provided for every other row of
twin-row configurations. If you lose a pin, the
replacement part number is 805-033C
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
Crushing and Sharp Object Hazards:
Do not attempt to lift a row unit by hand. The weight of the
unit, plus the force of the springs (even at minimum) is too
great (plus, a free hand is needed for pin insertion). Even with
multiple people lifting, hand-lifting is unsafe - there are
numerous sharp edges, and the row unit snaps down violently
if a grip is lost.
Figure 97
25AP Row Unit Lock-Up Pin
(Single Spring Row Unit Shown)
25269
31962
2
3
4
5
1
1 2
3