Sprocket indexing charts – Great Plains 3N-4025P Operator Manual User Manual
Page 90
86
3N-40P
Great Plains Manufacturing, Inc.
196-538M
2014-01-29
Sprocket Indexing Charts
1.
For: your 6- or 12-finger meter, and your twin row
spacing (30in on this page) find your seed rate in the
Population column, or your seed spacing in the Seed
Spacing column. Seed spacing is seed-to-seed
within a single row of a twin row pair.
2.
At the front/forward row unit of a pair, set the driven
(final) sprocket of the meter drive so that tooth
stamped #1 is straight up (TDC, 12:00 position).
3.
At the rear/trailing row unit of the pair, set the driven
sprocket so that the tooth number at “Rear Meter” is
in the straight up 12:00 position.
Not Rate or Spacing Charts:
These are NOT seed rate or seed spacing charts. These are for
staggering seed spacing between the rows of a twin row.
Note: For adjusting spacing between rows of the pair,
see “Indexing Fine Adjustment” on page 87.
Setting Error Risk:
Verify the 12:00 sprocket tooth position with the top length of
chain taut.
These charts are in U.S. customary units. See page 180 for metric charts (70cm twin row).
6 Finger Meter Twin Row Sprocket Indexing
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
34,700 to 36,200
11.6 to 12.1
1
2
36,200 to 37,800
11.1 to 11.6
1
5
37,800 to 39,300
10.6 to 11.1
1
8
39,300 to 40,800
10.3 to 10.6
1
11
40,800 to 42,500
9.8 to 10.3
1
14
42,500 to 44,000
9.5 to 9.8
1
17
44,000 to 45,400
9.2 to 9.5
1
1
45,400 to 47,000
8.9 to 9.2
1
4
47,000 to 48,600
8.6 to 8.9
1
7
48,600 to 50,400
8.3 to 8.6
1
10
50,400 to 51,800
8.1 to 8.3
1
13
51,800 to 53,300
7.8 to 8.1
1
16
31456B
Set Sprocket to
Tooth Number on ..
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
44,000 to 45,400
9.2 to 9.5
1
1
45,400 to 47,000
8.9 to 9.2
1
12
47,000 to 48,600
8.6 to 8.9
1
4
48,600 to 50,400
8.3 to 8.6
1
15
50,400 to 51,800
8.1 to 8.3
1
7
51,800 to 53,300
7.9 to 8.1
1
18
53,300 to 55,000
7.6 to 7.9
1
10
55,000 to 56,600
7.4 to 7.6
1
2
56,600 to 58,200
7.2 to 7.4
1
13
58,200 to 59,700
7.0 to 7.2
1
5
59,700 to 61,300
6.8 to 7.0
1
16
61,300 to 62,900
6.7 to 6.8
1
8
62,900 to 64,400
6.5 to 6.7
1
19
31457B
Set Sprocket to
Tooth Number on ..