Great Plains 20 User Manual

Great Plains Mfg., Inc.

Installation Instructions

12, 15 and 20 Series Drill

Small Seeds Option

Used with:

1200, 1210 and 1220 Drills

•

1500, 1510 and 1520 Drills

•

2000, 2010 and 2020 Drills

•

When you see this symbol, the subsequent instructions and
warnings areserious - follow withoutexception. Your life and

!

!

the lives of others depend on it!

General Information

These instructions explainhow to install the small-seeds attach­ment. The small-seeds attachment mounts behind the main drill
box and allows you to evenly seed very fine seeds.

Manual Update

Refer to the drill operator’s manual for detailed information on
safely operating, adjusting, troubleshooting and maintaining the
small-seeds attachment. Refer to the parts manual for part iden­tification.

• 12, 15 and 20 Series Drill Operator’sManual . .118-389M-A

• 12, 15 and 20 Series Drill Parts Manual. . . . . . . . . 118-389P

Definitions

Right and left as used in this manual are determined by facing
the direction the drill will travel in the field.

Assembly Instructions

If drill is outfitted with optional fertilizerbox,referto Small Seeds
with Fertilizer, page 4, for assembly instructions. If drill does not

have an optional fertilizer box, follow these instructions:

Small Seeds without Fertilizer

Refer to Figure 1.

1. Remove handles (1) from back side of main drill box. Keep
bolts, nuts and handles forlater use. Remove and save 1/2­by-1-inch bolt (2) joining main drill box to drill frame.

2. Install left-hand mount for small-seeds box(3) using 1/2-by­1-inchbolt(2)innewhole and 1/2-by-1 1/4-inchbolt(4)sup­plied in small-seeds kit. Fasten top of mount (3) to rear of
main drill box using handle holes. Use a new 1/2-by-1 1/4­inchbolt(5) fromsmall-seedskit. Reuse1/2-inchhex-flange
locknut(6) oninsideof main drill box.Leavemountnutsand
bolts loose.

3. Removefour3/8-by-1-inchhex-flange bolts (7). Save these
bolts and nut for reuse in the same holes.

4. Bolt small-seeds box (8) to main drill box.Atright-hand end
of box, use 3/8-by-1-inch bolts (7) removed in step 3. Also
add reinforcementstrap(9)suppliedinsmall-seeds kit to in­side of main drill box. At other end of box, bolt small-seeds
box to mount (3) using 3/8-by-1-inch hex-flange bolts, lock
washer,and nuts (10) supplied in small-seeds kit.

5. On 15- and 20-foot drills, repeat steps to install right-hand
small-seeds box.

6. Tighten all hardware. If you are installing a15-foot box,
check operation of flex coupler where main drill box meet.
Set both boxes at 50 percent open, and make sure that the
earsoncouplers(11)areoverlapping by about 3/8inch(9.5
mm).

12209

© Copyright 1999 Printed 1/23/07

Figure 1

Small-Seeds-Box, No Fertilizer

123-835M

1

Assembly

Great Plains Mfg., Inc.

12210

Refer to Figure 2.

1. Workingatfront,left-hand side of drill, removetwo1/2-by-1­inch 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. Relievetension 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 gauge­wheelbracketreusingtwo 3/8-by-11/2-inch bolts (15)plusa
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.

12, 15 and 20 Series Drill Small Seeds Option 123-835M 1/23/07

2

Front Drive, No Fertilizer

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-borebearingnearend of box.Se­cureshaftbydriving a rollpin(22)on outside of bearing (18)
and 12-tooth sprocket(23).

5. Unscrew acremeter (25) from gauge-wheel jackshaft, and
install3/4-inchhexbore,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
washerandjam nut(29).Install plastic 12-toothidlersprocket
(30) on gauge-wheel bracketas shown. Install but do not
tighten 132 pitch, gauge-wheel-drive chain (31).

Figure 2