Great Plains 3N-4025P Operator Manual - Manual (Page 119)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 115
2014-01-29 Table of Contents Index 196-538M
25 Series Row-Unit Adjustments
Refer to Figure 162 (which depicts a row unit fully
populated with all optional accessories supported for use
with the 3N-4010P, 3N-4010HDP, 3N-4020P and 3N-
4025P drill)
From front to back, a Great Plains 25 Series row unit can
include the following capabilities (some optional):
1. Dual Down Pressure Springs (Standard)
Each row unit is mounted on the drill with parallel
arms which allow each row unit to independently
move up and down while staying horizontal.
Adjustable springs provide the force to get the row
unit and attachments into the soil. See “25 Series
Row Unit Down-Pressure” on page 116.
2. Row Unit Spring Cam (Standard)
Adjustment sets the down-force used by the row unit.
3. Row cleaners (Optional)
Row cleaners clear trash from the row. Twin-row
drills support single-arm cleaners. Single-row drills
support single- or double-arm cleaners. See
“Unit-Mount Cleaner Adjustments” on page 90.
4. Disk Coulter (Optional, choice of blades)
Coulters cut any remaining trash, and create a
groove for light no-till planting. The down force
needed to cut and widen the coulter groove is
supplied by the row unit. The depth relative to the
opener is set by a choice of hub mounting holes. See
“Unit-Mounted Coulter Adjustments” on page 101.
5. Disc Blades (Standard, 2 per row unit)
Double disc blades widen the coulter groove,
creating the seed bed. Setup controls depth and
width. See “25 Series Disk Blade Adjustments” on
page 119.
6. Depth Side Gauge Wheels (Standard)
The depth gauge wheels have adjustments for
spacing and angle. See “Side Gauge Wheel
Adjustments” on page 111.
7. Seed meter (Required, choice of models/features)
Meters deliver singulated or volumetric seed. See
“Seed Meter Setup and Adjustment” on page 79.
8. Seed delivery tube (Standard, not shown)
No adjustments are necessary.
9. Seed Firmer (Optional)
Keeton
®
seed firmer (shown mounted)
Improves seed-soil contact, and provides a stable
arm for a low-rate liquid fertilizer delivery tube. See
See “25 Series Keeton
®
Adjustment” on page 121.
Seed-Lok
®
firming wheel (shown in inset)
Improves seed-soil contact. See “25 Series
Seed-Lok
®
Lock-Up (2009-)” on page 121.
10. Gauge Wheel Scraper (Optional)
The depth gauge wheels also accept an optional
scraper. See “25 Series Side Gauge Wheel
Scrapers” on page 120.
11. Press Wheel Type (Choice)
These close the seed trench. See “25 Series Press
Wheel Adjustments” on page 122.
Machine Damage Hazard:
Do not back up with row units in the ground. To do so will
cause severe damage and row unit plugging.
Figure 162
25 Series Row Unit
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