Great Plains YP2425F-2470 Material Rate - Manual (Page 25)

Great Plains Manufacturing, Inc. Table of Contents Appendix Sprocket Indexing (Stagger) 23
2013-09-23 Table of Contents Appendix 401-406B
Indexing Fine Adjustment
If, after indexing, twin-row side-to-side seed stagger is
substantially imbalanced, it is possible to make small
adjustments that may correct it.
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 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 charts on
page 21 or page 22.
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.
For 6-finger meters, changing the rear sprocket to the
next tooth 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 30 inch) planting
population is 29,900 or 14 inch seed spacing. The chart
setting for the rear sprocket is T#9 or T#12. Assume
tooth 9 was used. Each rear row seed should fall
7 inches behind the front row seed.
If each rear row seed measures only 6 inches behind the
front row seed, reset the rear meter sprocket to the next
number up in the chart (T#6). This moves the rear seeds
backward to make the stagger closer to 7 inches.
Example 2: The 6 Finger (Twin Row 30 inch) planting
population is 29,900 or 14 inch seed spacing. The chart
setting used for the rear sprocket is (T#9). Each rear row
seed should fall 7 inches behind front row seed.
If each rear row seed measures 8 inches behind the front
row seed, reset the rear meter sprocket to the next
number down in the chart (T#12). This will move the rear
seeds ahead to make the stagger closer to 7 inches.
28421
g p g
30in (76.2cm) Twin Row
Population Single Row
Seeds per Seed Front Rear
Acre Spacing (in) Meter Meter
15,700 to 17,300 24.2 to 26.6 1 4
17,300 to 18,800 22.2 to 24.2 1 7
18,800 to 20,400 20.5 to 22.2 1 10
20,400 to 22,000 19.0 to 20.5 1 13
22,000 to 23,600 17.7 to 19.0 1 16
23,600 to 25,000 16.7 to 17.7 1 19
25,000 to 26,600 15.7 to 16.7 1 3
26,600 to 28,300 14.8 to 15.7 1 6
28,300 to 29,900 14.0 to 14.8 1 9
29,900 to 31,500 13.3 to 14.0 1 12
31,500 to 33,000 12.7 to 13.3 1 15
33 000 to 34 700 12 1 to 12 7 1 18
Set Sprocket to
Tooth Number on ..
Advance ☞
Retard ☞
Current
☞
Figure 10: Portion of 6-Finger
Sprocket Indexing Chart
31456B