Great Plains 3PNG15 Material Rate - Manual (Page 13)

Great Plains Manufacturing, Inc. Smalls Seeds Box Planting 11
12/01/2010 202-579B
Changing Double Sprocket
Refer to Figure 9
4.
Loosen idlers and , and remove both chains
from double sprocket .
5. Remove retaining pin from shaft.
6. Remove sprocket from shaft, and reverse orienta-
tion of which disk is in/out.
7. Replace sprocket on shaft and re-pin .
8. Place chains back on sprockets.
9. Re-engage idler and tighten, leaving 3 ⁄
4
in slack in for-
ward span of chain .
10. If jackshaft sprocket does not need to be changed,
skip to step 17.
Changing Jackshaft Sprocket
It may be necessary to shorten or lengthen the upper
chain. It has removable links for this purpose.
Refer to Figure 3
When re-assembling a chain, make sure the open end of
the clip faces away from the direction of chain travel, to
reduce chain fouling from debris caught in the clip.
Refer to Figure 11
11. If the double sprocket did not need to be changed,
loosen upper idler ( in Figure 2).
12. Remove chain from jackshaft sprocket .
13. Loosen set screws on both upper sprockets (only
one of two shown in figure).
14. Slide current sprocket aside. Position it so that is
does not rub on any fixed machine parts. Re-tighten
the set screw.
15. Slide new sprocket into approximate position.
16. Re-mount chain, and align sprocket so that chain
is perpendicular to the jackshaft (parallel to the
ground drive frame). Tighten set screw
.
17. Re-engage idler and tighten it until there is 1 ⁄
2
in
slack in the forward span.
1
Figure 9
Double Sprocket
16409
4
5
3
6
3 4
1
5
1
1 5
6
Figure 10
Chain Link and Clip
26482
Figure 11
Jackshaft Sprockets
16412
2
8
7
3
2
7
2
7
3