Great Plains 3N-4025P Operator Manual - Manual (Page 79)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 75
2014-01-29 Table of Contents Index 196-538M
Frame-Mounted Coulters
The factory configuration of frame-mounted coulters
(FMC) is to run about 1 inch (2.5 cm) deeper than the
opener blades. Based on your conditions and
experience, you can readjust the depth drill-wide, or just
at some rows.
Frame-mounted coulters, as factory-installed, are used
“in row” and not “zone”. They are intended to prepare the
soil directly ahead of the seed furrow.
With frame-mounted coulters, the coulter depth controls
opener depth and performance. Set the frame height to
achieve the desired coulter depth.
There are three adjustments for frame-mounted coulters:
Refer to Figure 92
1.
Frame height - the running depth of all coulters as a
group. This is set by a hydraulic stop, the next topic.
2. Individual coulter depth - a mechanical adjustment
for a few rows in tire tracks. See page 77.
3. Individual coulter down-force - this is a spring
adjustment for rows in tracks, or all rows - in
unusually light or heavy no-till conditions. See
page 78.
Frame Height - Frame Mounted Coulters
Refer to Figure 93
In regular or heavy no-till conditions, set
the coulter depth to about 1 inch (2.5 cm) deeper than
seeding depth.
For example, if
the desired seeding depth is 1 inch (2.5 cm), set
the coulters to run at 2 inch (5.1 cm) deep.
Setting coulters too deep for conditions can cause
opener plugging and uneven or too-deep seed depth. In
light no-till or conventional till conditions, it may be
necessary to set coulter depth
to less than 1 inch
(2.5 cm) below seeding depth , or even
1 ⁄
4
inch (6 mm)
above seeding depth.
In addition to checking depths at setup, be sure to check
actual seeding results while planting.
Figure 92: FMC:
Coulter Adjustment Points
20274
27215
4
5
6
Figure 93: FMC:
Coulter to Opener Depth
27070
7 8
7
8
8
7
7
8