Great Plains 20 Series Drill Assembly Instructions - Manual (Page 2)

2 12, 15 and 20 Series Drill Small Seeds Option 123-835M 1/23/07
Great Plains Mfg., Inc.
Assembly
Refer to Figure 2.
1. Working at front, left-hand side of drill, remove two 1/2-by-1-
inch bolts (12) that join main drill box to drill frame. Install
left-hand bearing bracket (13) using 1/2-by-1 1/2-inch bolts
and flat washers from small-seeds kit. Leave these bolts
loose.
2. Relieve tension on chain (14) that runs from gearbox-output
sprocket to seed jackshaft. Remove two 3/8-by-1 1/2-inch
bolts (15) that join sprocket and bearing assembly (16) to
gauge-wheel bracket. Bolt long idler plate (17) to gauge-
wheel bracket reusing two 3/8-by-1 1/2-inch bolts (15) plus a
third from small-seeds kit. Leave these bolts loose for now.
3. Install hex-bore bearings (18) on plates (13 and 17) using
flangettes (19) and hardware as shown. Be careful to place
bearings on side of plates as illustrated.
4. Slide 7/8-inch hex jackshaft (20) through hex-bore bearing
mounted above gauge wheel. Slip shaft through 29-tooth
sprocket (21) and into hex-bore bearing near end of box. Se-
cure shaft by driving a roll pin (22) on outside of bearing (18)
and 12-tooth sprocket (23).
5. Unscrew acremeter (25) from gauge-wheel jackshaft, and
install 3/4-inch hex bore,14-tooth sprocket (26) using roll pin
(27). Orient sprocket as shown. Re-install acremeter.
6. Install 17-tooth, ball-bearing idler sprocket (28) on idler plate
(17) using 5/8-by-3 1/2-inch, full-thread bolt, flat washer, lock
washer and jam nut (29). Install plastic 12-tooth idler sprocket
(30) on gauge-wheel bracket as shown. Install but do not
tighten 132 pitch, gauge-wheel-drive chain (31).
12210
Figure 2
Front Drive, No Fertilizer