Great Plains 20 Series Drill Assembly Instructions - Manual (Page 3)

3 1/23/07 12, 15 and 20 Series Drill Small Seeds Option 123-835M
Great Plains Mfg., Inc.
Assembly
Refer to Figure 3.
7. Working at rear of drill, install two flush-mount bearings (32)
on mount bracket using 5/16-by-1-inch carriage bolts (33),
nuts and lock washers supplied with small-seeds kit. Install
3/4-inch round jackshaft (34) in bearings and slip two 17-
tooth sprockets (35 and 36) over shaft as shown.
8. Fasten idler arm (37) to mount bracket using 1/2-by-1 1/4-
inch carriage bolt (38). Place 12-tooth plastic idler sprocket
(39) on idler. Hold idler in place with 1/2-inch flat washer (40)
and cotter pin (41).
9. Align inner 17-tooth sprocket (35) with small-seeds-box
sprocket (42). Install 61-pitch chain (43) and remove chain
slack with idler sprocket.
Figure 3
Rear Drive
Refer to Figure 4.
10. Thread 98-pitch chain (44) back through the cutout in box,
around rear sprocket and back to front 12-tooth sprocket
(45) as shown. After connecting chain, check alignment of
sprocket on rear of drill with sprocket at front. Move rear
sprocket if needed. To tighten this chain move 7/8-inch hex
jackshaft (46) forward by using slots in bearing plates (47
and 48). After removing excess slack, tighten bolts holding
both plates.
11. Tighten idler for gearbox-output chain.
12. Move 17-tooth idler sprocket (28) to remove excess slack
from chain coming from gauge wheel.
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Figure 4
Chain Installation
Refer to Figure 5.
13. Place chain shield (49) over end of small-seeds box. Install
handle (50) using bolt (51) removed in step 1.
14. On 20-foot drills, repeat steps to install drive for right-hand
box.
Figure 5
Handle and Cover Assembly
15. On 20-foot drills, repeat steps to install drive for right-hand
box.
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