Great Plains 2010 Assembly Instructions - Manual (Page 2)

2 12, 15 and 20 Series Drills Fertilizer Option 142-591M 3/5/07
Great Plains Mfg., Inc.
Assembly
12503
Installing Drive
Refer to Figure 2.
1. Working at front, left-hand side of drill, remove two front 1/2-
by-1-inch bolts (13) that join seed box to drill frame. Install
the left-hand bearing bracket (14) using 1/2-by-1 1/2-inch
bolts (13) and flat washers from fertilizer kit. Leave these
bolts loose.
2. Relieve tension on chain (15) that runs from gearbox-output
sprocket to seed jackshaft. Remove two 3/8-by-1 1/2-inch
bolts (16) that join sprocket and bearing assembly (17) to
gauge-wheel bracket. Bolt idler plate (18) to gauge-wheel
bracket reusing two 3/8-by-1 1/2-inch bolts (16) plus a third
from fertilizer kit. Leave these bolts loose.
3. Install two hex-bore bearings (19) on plates (14 and 18) us-
ing flangettes (20) and 5/16-by-1-inch carriage bolt (21) and
hardware as shown. Be careful to place bearings on side of
plates as illustrated.
4. Slide 7/8-inch hex jackshaft (22) through bearing mounted
above gauge wheel. Slip shaft through 29-tooth sprocket
(23) and into bearing near end of seed box. Secure shaft by
driving a roll pin (24) on outside of bearing (19) and 12-tooth
sprocket (25).
5. Unscrew acremeter (26) from gauge-wheel jackshaft. Install
3/4-inch hex bore, 14-tooth sprocket, (27) using roll pin (28).
Orient sprocket as shown. Re-install acremeter.
6. Install 17-tooth ball bearing idler sprocket (29) in slot using
the 5/8-by-3 1/2-inch, full-threaded bolt, flat washer, lock
washer and jam nut (30). Install plastic 12-tooth idler sprocket
(31) as shown. Install but do not tighten 132-pitch, gauge-
wheel-drive chain (32).
Figure 2
Front Drive