Great Plains 3P4025AH Operator Manual - Manual (Page 68)

64 3P4025AH Table of Contents Index Great Plains Manufacturing, Inc.
411-099M Table of Contents Index 2014-07-29
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 69 on page 63
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 70
Clean out meter. See “Meter Clean-Out” on page 80.
Remove seed disk and install blank disk. See “Air-Pro
®
Meter Disk Installation” on page 62.
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.
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 71
The lock-up pins
for each front row unit 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.
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.
Note: If you lose a pin, the replacement part number is
805-435C
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 70
Shutter Closed, Blank Disk Installed
29610
2
1
Figure 71
25AP Row Unit Lock-Up Pin
25269
31962
1
2
3
4
5
1
2
3