Great Plains 3N-4020 Operator Manual - Manual (Page 67)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 63
2013-10-29 Table of Contents Index 196-359M
Frame-Mounted Coulters
The factory configuration of frame-mounted coulters
(FMC) is that they run about 1in (2.5cm) deeper than the
opener blades. Based on your conditions and experi-
ence, 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 89
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 65.
3. Individual coulter down-force - this is a spring adjust-
ment for rows in tracks, or all rows - in unusually light
or heavy no-till conditions. See page 66.
Frame Height - Frame Mounted Coulters
Refer to Figure 90
In regular or heavy no-till conditions, set
the coulter depth to about 1in (2.5cm) deeper than
seeding depth.
For example, if
the desired seeding depth is 1in (2.5cm), set
the coulters to run at 2in (5.1cm) 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 nec-
essary to set coulter depth
to less than 1in (2.5cm)
below seeding depth , or even 1 /
4
in (6mm) above seed-
ing depth.
In addition to checking depths at setup, be sure to check
actual seeding results while planting.
Figure 89: FMC:
Coulter Adjustment Points
20274
27215
4
5
6
Figure 90: FMC:
Coulter to Opener Depth
27070
7 8
7
8
8
7
7
8