Great Plains 2010 Assembly Instructions - Manual (Page 3)

3 3/5/07 12, 15 and 20 Series Drills Fertilizer Option 142-591M
Great Plains Mfg., Inc.
Assembly
Refer to Figure 3.
7. Working on rear of drill, install two flush-mount bearings (33)
using 5/16-by-1-inch carriage bolts (34), nuts and lock
washers supplied with fertilizer kit. Install jackshaft (35) in
bearings, and slip 17-tooth (36) and 12-tooth sprocket (37)
over shaft as shown. Mount 12-tooth idler sprocket (38) to
slotted bracket using 1/2-by-1 1/4-inch hex bolt (39), jam nut
(40), flat washers (41) and nylock jam nut (42).
8. Align lower 12-tooth sprocket (37) with fertilizer box sprocket
(43).
NOTE: On drills with 00 Series, straight-arm openers, position
these sprockets and chain so they are not directly over an open-
er spring rod.
9. Install 56-pitch chain (44). Remove slack with idler sprocket.
Figure 3
Rear Drive
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Refer to Figure 4.
10. Thread drive chain (45) back through cutout in box, around
rear sprocket and back to front 12-tooth sprocket (46). After
connecting chain, check sprocket alignment. Move rear
sprocket if necessary. To tighten this chain, move jackshaft
(47) forward by using the slots in bearing plates (48 and 49).
After removing excess slack, tighten bolts holding both
plates. Tighten the idler for the gearbox output chain that
was loosened when you started.
11. To remove excess slack from chain coming from gauge
wheel, move 17-tooth, ball-bearing idler sprocket (29) and
tighten.
Figure 4
Chain Installation
12. On 20-foot drills, repeat steps to install right-hand drive.
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