Great Plains 3P4025AH Operator Manual - Manual (Page 55)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 51
2014-07-29 Table of Contents Index 411-099M
25AP Series Row Unit Adjustments
Refer to Figure 39
(which depicts a row unit populated with most optional
accessories supported for use with the 3P4025AH)
From front to back, a Great Plains 25 Series Air-Pro
®
row
unit can include the following capabilities (some
optional):
1. Lock-Up Pin Storage Hole (Hole Standard)
See “Row Unit Shut-Off” on page 63.
2. Down-Pressure Cam (Standard)
Row units are mounted on parallel arms. This
parallel-action mounting allows the row-unit to move
up and down while staying horizontal. Springs add
an adjustable force, set by the cam, to the row
weight. See “Row Unit Down Pressure” on
page 52.
3. Meter Pressurization Air Inlet (Standard)
Pressure-regulated air enters the meter here and
holds seed in the disk pockets. See “Fan and
Adjustment” on page 42.
4. Seed Delivery Inlet (Standard)
Gravity carries the seed from the hopper into the
meter at the shutter
. There are no adjustments.
5. Air-Pro
®
Seed Meter (Standard, Choice of Disks)
See “Air-Pro
®
Meter Disk Installation” on page 62.
6. Seed Inlet Shutter (Standard)
This controls the level of bulk seed at the disk. There
are multiple operating settings, plus fully open
(clean-out) and fully closed (shut-off or storage). See
“Seed Inlet Shutter Adjustment” on page 60.
7. Side Gauge Wheel Depth (Standard)
The T-handle sets planting depth by controlling the
height of the side gauge wheels relative to the
opener discs. See “Side Gauge Wheel
Adjustment” on page 58.
8. Press Wheel Force, Angle, Stagger (Standard)
The press wheels close the furrow, gently pressing
the soil over the seed to ensure good seed to soil
contact for even emergence. See “Press Wheel
Adjustment” on page 66.
9. Row Unit Lock-Up Hole (Hole Standard)
Pins are standard on some models. With the row unit
raised above level, the lock-up pin is inserted here.
See “Row Unit Shut-Off” on page 63.
10. Row Cleaner (Option)
Row cleaners clear trash from the row, to a depth set
by an adjustment on the arms. See “Unit-Mount
Cleaner Adjustments” on page 54.
11. Unit-Mount Coulter (Option)
Coulters cut remaining trash and begin opening the
seed furrow. Working depth is set by row depth and a
mounting hole selection. See “Coulter
Adjustments” on page 55.
12. Opener Discs (Standard)
Row-unit double disc openers create the seedbed
furrow. They have adjustments for angle and
spacing. See “Row-Unit Opener Disk
Adjustments” on page 57.
13. Seed Tube with Sensor (Standard)
Requires no adjustment.
14. Scrapers (Optional, not shown)
Inside scrapers require no adjustment. For gauge
wheel scrapers, see “Adjusting Gauge Wheel
Scrapers” on page 59.
15. Seed Firmers (Seed Flap Standard, not shown)
An optional seed firmer (Keeton
®
shown) minimizes
seed bounce and improves soil contact. It may also
deliver fertilizer. See “Seed Firmer Adjustments”
on page 65.
16. Press Wheel Type (Choice)
A variety of single and dual press wheel assemblies
are available, some region-specific. Consult your
Great Plains dealer.
Equipment Damage Risk:
Do not back up with row units in the ground. To do so will
cause row unit plugging and may result in severe damage.
Figure 39
25AP Series Row Unit
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