Great Plains 3S-4000 Assembly Instructions User Manual
General information assembly instructions, Replacement gearbox, Before you start
Table of contents
Document Outline
- 195-227A 30’ 3-Section Gearbox Replacement-Center
- 195-226A 30’ 3-Section Gearbox Replacement-LH
- 195-228A 30’ 3-Section Gearbox Replacement-RH
- Before You Start
- Figure 1
- 1. Remove chain (1) from gearbox to seed-cup sprocket. Save chain for later reinstallation.
- 2. Remove and discard bolts (2) holding gearbox (3) on gearbox shelf (4). Remove and discard gearbox and gearbox cover (5). Save existing brass tag (6) and hardware (7) from gearbox cover.
- 3. Disconnect clutch (8) and remove from bracket.
- 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.
- 8. 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 existing gearbox shelf. To locate access hole, hold new gearbox and mounting plate over gearbox shelf. Align gearbox output sprocket (19) with seed-cup sprocket. Mark idler bracket location.
- 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
- 14. Route chain provided in kit over jackshaft drive sprocket and gearbox input sprocket (18). Use new idler (20) to remove chain slack. Refer to Figure 5 for chain routing.
- 15. Reroute chain removed in step 1 over gearbox output sprocket (19) and seed-cup sprocket. Refer to Figure 5 for chain routing.
- 16. Refer to Figure 3 and assemble new gearbox cover (24) on gearbox using two 3/8-inch, self-tapping screws (25).
- 17. Assemble gearbox handle (26) onto gearbox with 1/4-inch bolt, lock washer and flat washer.
- 18. Attach brass tags removed in step 2 to new gearbox covers.
- Chain Routings
- Figure 6
- 19. Weld the idler mount plate to the frame tube using the dimensions shown as a guide.
- 20. In each slot on idler mount plate, attach a 12- tooth sprocket in this order: 1/2-inch bolt, sprocket, jam nut, flat washer, idler mount plate, lock washer, and nut.
- 21. Route chain around idlers and tighten to remove slack. Refer to Figure 5 on the previous page for chain routing.
- 22. Go back to step 16 on page 3 and continue with gearbox assembly instructions.
- General Information
- Assembly Instructions