Great Plains 3N-4020 Operator Manual - Manual (Page 131)

Great Plains Manufacturing, Inc. Table of Contents Index Appendix 127
2013-10-29 Table of Contents Index 196-359M
Row Spacing Data
The diagrams in this section show useful measures that
vary between machine models, row spacings, and modi-
fied row spacings. Use this data for calibration (page 39), setting marker
extension (page 18), and shutting off rows for modified
spacings (page 66).
Example Row Spacing
-6475 as “-1630”
Baseline Span: 476.5in (1210cm)
Active Span: 454in (1153cm)
Swath: 484in/40.3ft (1229cm/12.3m)
Swath-Averaged Row Spacing: 7.56in (19.2cm)
Active Nominal Row Spacing: 30in (76.2cm)
Row Spacing Data Legend
Refer to Figure 175
Find the chart for your drill’s row spacing. Row spacings
are identical across 3N-4010F, -4010HDF and -4020F.
, : The heading and title block identify the drill
opener configuration, default row count, default row
spacing, and whether the diagram applies to a standard
or modified row spacing.
: Span is the dimension between the center-lines of
the left and right outside row units. If all are active, only a
single “Span” value is given. If some are inactive, a
“Baseline Span” for all rows is given, as well as an
“Active Span” for just the rows in use. You may need this
data for modified row spacings not shown.
: Swath is the average width of successive planted
passes. Swath is at least one row spacing wider than the
[Active] Span, and is wider on 7.5in models, as there is
an extra 2in at each wing-center tool bar gap.
: Row Spacing
Shows standard or “Active” row spacing.
: Each illustration shows three drills, their tool bars
represented by the horizontal lines.
: The large top arrow shows drill centerline the direc-
tion of travel. This is always drill centerline, and not nec-
essarily the center of the presently active row units.
: Solid lines with arrows across the tool bar show
active row units.
: Dashed lines without arrows across the tool bar
show inactive row units.
, :Marker Extension values are shown separately
for left and right side opposing passes. They may not be
the same, and can be substantially unequal, particularly
for modified spacings.
For setting marker extension, measure from the mark to
the centerline of the outside opener on each side,
whether that opener row is active or not.
Note: Opposing passes are presumed for these exten-
sion values. For concentric passes, only one
marker side is used. Measure from drill centerline
to the mark, and set the extension to the Swath
value
for your configuration.
1
3
4
5
Figure 175: -6475 as -1630
Non-standard spacing: 16 Single 30in Rows; 32 rows unused
28242
2
6
7 9 8
10 11
1 2
3
4
5
6
7
8
9
10 11
4