3P3025AH
Adjustments
Great Plains
| 411-332M | 2019-02-19
75
Row Unit Shut-Off
Refer to Figure 95
Skip-row operations, such as planting from every other
row when switching from 30 inch twin-row to 30 inch
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 disc with blank disc (always done).
4. Close seed flow to row at Y-tube (if present).
5. Lock up row unit to reduce wear (optional).
6. Reset planter monitor active row pattern and row
spacing to avoid nuisance alarms (always done).
7. Shut off fertilizer drop lines (Option, see Seed and
Fertilizer Rate manual ManualB # for details).
Meter drive is not disabled on 25AP row units during
shut-off.
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.
Close Seed Shutter
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).
Install Blank Disc
Clean out meter. See “
Remove seed disc and install blank disc. See “
Blank discs (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
disc.
Blank discs are engineered to simulate a seed disc with
seed in all pockets. Blanks are particularly important on
the rows with sensor lines to the pressure chamber.
Figure 95
Seed Inlet Shutter Closed
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2
1
Irregular Seeding Risk:
Always use a blank disc in a shut-off row. Operating with no
disc, or with a seed disc but no seed, destabilizes the regulated
airflow, particularly at rows with pressure sensor lines.
Figure 96
Shutter Closed, Blank Disc Installed
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