Great Plains 3S-4000 Assembly Instructions - Manual (Page 2)

195-231M 7/22/10
Great Plains Mfg., Inc.
Replacement Gearbox 2
Refer to Figure 2.
3.
Figure 2 18377
Disconnect clutch (8) and remove from brack-
et.
NOTE: This Replacement Gearbox kit will work
with either the wrap spring clutch or the jaw clutch.
4. Remove bolts from bearing flanges (9) on
gearbox jackshaft (10).
5. Remove jackshaft and disassemble bevel
gear (11) and set collar (12) from jackshaft.
Discard bevel gear and set collar.
6. Replace bevel gear with 16-tooth sprocket
(13) from kit using key (14) from preexisting
bevel gear. Do not tighten set screws on
sprocket at this time.
7. Reinstall jackshaft and reconnect clutch.
Refer to Figure 3
8.
Figure 3 18378
Using four 3/8-inch, self-tapping screws and
lock washers (15), bolt new gearbox (16) onto
mounting plate (17).
9. Mount 16-tooth, spline-bore sprocket (18) on
gearbox input shaft above idler bracket.
Mount 12-tooth, spline-bore sprocket (19) on
gearbox output shaft. Secure sprockets with
snap rings.
10. Mount 12-tooth sprocket (20) on idler bracket
in this order: 1/2-inch bolt, sprocket, jam nut,
flat washer, bracket, lock washer, and nut.
11. Torch a rectangular access hole (21) in exist-
ing gearbox shelf. To locate access hole, hold
new gearbox and mounting plate over gear-
box shelf. Align gearbox output sprocket (19)
with seed-cup sprocket. Mark idler bracket lo-
cation.
12. Use mounting spacers (22) and 3/8 x 1 1/2
inch bolts (23) to bolt mounting plate and
gearbox on gearbox shelf.
13. Align drive sprocket on jackshaft with gearbox
input sprocket (18). Tighten set screws on
drive sprocket