Great Plains 3N-4025P Operator Manual - Manual (Page 91)

Great Plains Manufacturing, Inc. Table of Contents Index Adjustments 87
2014-01-29 Table of Contents Index 196-538M
Indexing Fine Adjustment
If, after indexing, the twin-row side-to-side seed stagger
is substantially imbalanced, it is possible to make small
adjustments that may correct it. Imbalance can occur
over time as row unit chains wear and stretch.
The procedure is different for 6- and 12-finger meters.
If an adjustment is made, test it on one row pair before
adjusting the entire planter.
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 is counted as one seed.)
• Make sure the current front sprocket index is 1, and
the current rear sprocket index number matches the
number in the indexing chart for actual seed spacing
being planted.
6-Finger Meter Stagger Adjustment
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 up in the
chart retards, moving each rear row seed back a small
amount.
Changing rear sprocket to the next number down in the
chart advances, moving each rear row seed ahead a
small amount.
Example 1:
The 6 Finger, Twin Row 30in planting population is
32000 or 13.1in seed spacing. The chart setting for the
rear sprocket is [ 15 ]. Each rear row seed should fall
6.6in behind the front row seed.
If each rear row seed measures only 5in behind the front
row seed, reset the rear meter sprocket to the next
number up in the chart [ 12 ]. This moves the rear seeds
back to make the stagger closer to 6.6in.
Example 2:
The 6 Finger, Twin Row 30in planting population is
32000 or 13.1in seed spacing. The chart setting for the
rear sprocket is [ 15 ]. Each rear row seed should fall
6.6in behind front row seed.
If each rear row seed measures 9in behind the front row
seed, reset the rear meter sprocket to the next number
down in the chart [ 18 ]. This moves the rear seeds
ahead to make the stagger closer to 6.6in.
28421
Figure 110: Portion of
Sprocket Indexing Chart
YP40-index
06.eps
Seeds per Seed Front Rear
Acre Spacing (in) Meter Meter
700 to 17,300 24.2 to 26.6 1 4
300 to 18,800 22.2 to 24.2 1 7
800 to 20,400 20.5 to 22.2 1 10
400 to 22,000 19.0 to 20.5 1 13
000 to 23,600 17.7 to 19.0 1 16
600 to 25,000 16.7 to 17.7 1 19
000 to 26,600 15.7 to 16.7 1 3
600 to 28,300 14.8 to 15.7 1 6
300 to 29,900 14.0 to 14.8 1 9
900 to 31,500 13.3 to 14.0 1 12
500 to 33,000 12.7 to 13.3 1 15
000 to 34,700 12.1 to 12.7 1 18
700 to 36,200 11.6 to 12.1 1 2
200 to 37,800 11.1 to 11.6 1 5
Advance
Retard
Current