Great Plains 2525A Operator Manual - Manual (Page 54)

50 2025A/2525A Table of Contents Index Great Plains Manufacturing, Inc.
118-999M Table of Contents Index 2013-06-04
1. Identify Rows to Shut Off
On twin-row drills, openers are installed with short and
long opener mounts. If locking up unused rows of a
twin-row drill, shut off the rear (long mount) rows.
On single-row drills with mid-length mounts, any rows
may be locked up.
2. Close Seed Tube at Box
Refer to Figure 53
To prevent a small amount of seed from becoming
unavailable for planting, install plugs
at the top of seed
tubes at unused rows. See page 83 for plug ordering
information.
3. Close Seed Shutter
Refer to Figure 52 on page 49
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 pressure air from
leaking into the seed delivery tube (which is usually
empty if a plug is installed in the box), 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.
4. Install Blank Disk
Refer to Figure 54
Clean out meter. See “Meter Clean-Out” on page 66.
Remove seed disk and install blank disk. See “Air-Pro®
Meter Disk Installation” on page 48.
Blank disks (part number 817-841C) are essential in row
shut-off, both to maintain consistent meter back-pressure
to meter pressure 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.
1
Figure 53
Seed Tube Shutoff
26226
1
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 54
Shutter Closed, Blank Disk Installed
29610
2
1