Great Plains 3N-4025P Operator Manual - Manual (Page 92)

88 3N-40P Table of Contents Index Great Plains Manufacturing, Inc.
196-538M Table of Contents Index 2014-01-29
12-Finger Meter Stagger Adjustment
Before making any Indexing Adjustments, check actual
planted seed spacing. Seed Spacing is found by
measuring the distance between 25 correctly planted
seeds in one row and dividing by 24. (A visible skip or
double should be counted as one seed.) Make sure
current front index is 1, and current rear sprocket index
number matches the number in the indexing chart for
actual seed spacing being planted.
Find your current indexing value row in the chart on
page 86.
Each (sprocket tooth) number directly above or below the
current rear meter sprocket setting in the right most
column of the seed indexing chart represents a small
movement of the rear row seed relative to the front row
seed.
Changing rear your sprocket to the next number down in
the chart retards, moving each rear row seed back a small amount.
Changing rear sprocket to the next number up in the
chart advances, moving each rear row seed ahead a
small amount.
Example 1:
The 12 Finger Twin Row 30in planting population is
37000 or 11.3n seed spacing. The chart setting for the
rear sprocket is [ 3 ]. Each rear row seed should fall 5.6in
behind the front row seed.
If each rear row seed measures 7in behind the front row
seed, reset the rear meter sprocket to the next number
down in the chart [ 14 ]. This will move the rear seeds
ahead and make the stagger closer to 5.6in.
Example 2:
The 12 Finger Twin Row 30in planting population is
37000 or 11.3in seed spacing. The chart setting for the
rear sprocket is [ 3 ]. Each rear row seed should fall 5.6in
behind the front row seed.
If each rear row seed measures 4in behind the front row
seed, reset the rear meter sprocket to the next number
up in the chart [ 11 ]. This will move the rear seeds back
to make the stagger closer to 5.6in.
28422
Figure 111: Portion of
Sprocket Indexing Chart
YP40-index
12.eps
12 Finger Meter Twin Row Sprocket Indexing
30in (76.2cm) Twin Row
Population Single Row
Seeds per Seed Front Rear
Acre Spacing (in) Meter Meter
26,600 to 28,300 14.8 to 15.7 1 13
28,300 to 29,900 14.0 to 14.8 1 5
29,900 to 31,500 13.3 to 14.0 1 16
31,500 to 33,000 12.7 to 13.3 1 8
33,000 to 34,700 12.1 to 12.7 1 19
34,700 to 36,200 11.6 to 12.1 1 11
36,200 to 37,800 11.1 to 11.6 1 3
37,800 to 39,300 10.6 to 11.1 1 14
39,300 to 40,800 10.3 to 10.6 1 6
40,800 to 42,500 9.8 to 10.3 1 17
42,500 to 44,000 9.5 to 9.8 1 9
Set Sprocket to
Tooth Number on ..
Advance
Retard
Current