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Series VIII 8321, 8324, 8326, 8328,
Read the operator's manual entirely. When you see this symbol, the
subsequent instructions and warnings are serious - follow without
exception. Your life and the lives of others depend on it!
Illustrations may show optional equipment not supplied with standard unit.
ORIGINAL INSTRUCTIONS
© Copyright 2025
Table of Contents
Index
Operator Manual
Discovator (Disc & Coulter)
8333, 8537, 8544, 8548 & 8552
Manufacturing, Inc.
www.greatplainsmfg.com
Printed 2025-04-07
Index
41419
EN
550-353M
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Related Manuals for GREAT PLAINS VIII Series
Summary of Contents for GREAT PLAINS VIII Series
- Page 1 Table of Contents Index Operator Manual Discovator (Disc & Coulter) Series VIII 8321, 8324, 8326, 8328, 8333, 8537, 8544, 8548 & 8552 Manufacturing, Inc. www.greatplainsmfg.com Read the operator’s manual entirely. When you see this symbol, the subsequent instructions and warnings are serious - follow without exception.
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Page 2: Machine Identification
Machine Identification Record your machine details in the log below. If you replace this manual, be sure to transfer this information to the new manual. If you or the dealer have added options not originally ordered with the machine, or removed options that were originally ordered, the weights and measurements are no longer accurate for your machine. - Page 3 Great Plains Manufacturing, Inc. assumes no responsibility for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained herein. Great Plains Manufacturing, Inc. reserves the right to revise and improve its products as it sees fit.
- Page 4 8321-8552DV Table of Contents Index Great Plains | 550-353M | 2025-04-07 Table of Contents Index...
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Page 5: Caution, Defined
Be Familiar with Safety Decals Read and understand “Safety Decals” on page 5, thoroughly. Read all instructions noted on the decals. Keep decals clean. Replace damaged, faded and illegible decals. Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 6: Chemicals
Riders obstruct the operator’s view. Riders could be struck by foreign objects or thrown from the machine. Never allow children to operate equipment. Keep all bystanders away from machine during operation. Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 7: Shutdown
Use a safety cage if available. When removing and installing wheels, use wheel-handling equipment adequate for weight involved. Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 8: Practice Safe Maintenance
Wear snug-fitting clothing to avoid entanglement with moving parts. Watch out for wires, trees, etc., when folding and raising machine. Make sure all persons are clear of working area. Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 9: Decal Replacement
Keep all safety decals clean and legible. Replace all damaged or missing decals. Order new decals from your Great Plains dealer. Refer to this section for proper decal placement. When ordering new parts or components, also request corresponding safety decals. -
Page 10: Amber Reflectors
Do not stand between implement and moving tractor. Stop tractor engine and set park brake before installing pins. 838-600C Danger: Crushing Hazard On front (middle) of hitch; 1 total 40905 Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 11: Danger Electrocution
Keep Wing Safety Pins in Place Until Cylinder & Lines Are Full of Oil & Free of Air 838-612C Warning: Wings Could Fall Front of wing stops, (both sides); 2 total 40910 Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 12: High Pressure Fluid Hazard
Do Not exceed 20 mph maximum transport speed. Loss of vehicle control and/or machine can result. 818-188C Rev. C Warning: Hand Crushing On front side of center wing brace (left & right sides); 2 total 40905 Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 13: Decals Caution General Instructions
• Maximum inflation pressure of tires is 52psi. • Torque wheel bolts to 90ft-lb. 818-752C Caution: Tire Pressure/ Torque On frame near transport tire; 8326, 8328, 8333 - 2 total 41252 Great Plains | 550-353M | 2025-04-07 Table of Contents Index... - Page 14 • Maximum inflation pressure of tires is 73psi. • Torque wheel bolts to 85 - 100ft-lb. 858-997C Caution: Tire Pressure/ Torque On frame near transport tire; 8548, 8552 - 2 total 43083a Great Plains | 550-353M | 2025-04-07 Table of Contents Index...
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Page 15: Adjust Gang Depth
ADJUST DISC GANGS TO RUN 1/2” TO 1” SHALLOWER THAN SWEEPS. CHECK ALL BOLTS FOR TIGHTNESS PERIODICALLY. K-12 Notice: Adjust Gang Depth Front side of center wing brace (operator side); 1 total 41252 Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 16: Covered Models
Table of Contents Index Introduction Introduction Great Plains welcomes you to our growing family of new product owners. The Series VIII Discovator, DV (Disc & Coulter) 8321-8552DV have been designed with care and built by skilled workers using quality materials. -
Page 17: Customer Service
Model Number:__________________________ 41134 Serial Number: __________________________ Your Great Plains dealer wants you to be satisfied with your new machine. If you do not understand any part of this manual or are not satisfied with the service received, please take the following actions. -
Page 18: Checklists Pre-Setup
Check again for hydraulic leaks and watch that transport pins when moving from field to field. You hoses do not get pinched in hinges, wing stops, etc. are now ready to go to the field. Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 19: Chain
5. After hitching tractor to Discovator, store jack on storage tube (2) on side of Discovator tongue. 6. Secure Discovator safety chain to an anchor on the tractor capable of pulling the unit. 41644 Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 20: Hydraulic Hose Hookup
Index Preparation and Setup Hydraulic Hose Hookup Great Plains hydraulic hoses are color coded to help you hookup hoses to your tractor outlets. Hoses that go to High Pressure Fluid Hazard: the same remote valve are marked with the same color. -
Page 21: Side To Side Leveling
(5). With the hydraulic gauge wheel option anytime the depth of the discs are adjusted the hydraulic cylinder will adjust the gauge wheels accordingly. 69183 Great Plains | 550-353M | 2025-04-07 Table of Contents Index... - Page 22 1 full turn of the handle (2) either in or out will change the depth approximately ” up or down respectively. 11. Make any fine tuning adjustments on the leveling of the machine. 42339 Great Plains | 550-353M | 2025-04-07 Table of Contents Index...
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Page 23: Transporting
Comply with all federal, state and local safety laws when traveling on public roads. Travel with caution. Allow safe clearance. Remember that the Discovator is wider than the tractor. Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 24: General Operation And In-Field Adjustments
(spring scraper) loosened up and slid into blade until they just touch the blade, and torqued to specs. • Coulter scrapers u-bolts will need loosened and scrapers centered between coulter blades, and torqued to specs. Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 25: Rear Attachment Settings
13. Be sure the fold catch assembly (9) is aligned 3 ” from back of rear angle iron of fold catch to rear of arm as shown. 42219 Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 26: Coil Tine Drags
42337 Reel Settings 15. If a reel is added, adjust the amount of down pressure by either shortening the eyebolt for less pressure or lengthening for more pressure. Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 27: Wheel Bearing Hub
Units built after 05/2017 may not have grease zerks on the hubs. Type of Lubrication: Grease Quantity: Sparingly, Do Not Over Grease, may cause damage seal. Repack wheel bearings annually or every 2500 acres. 41622 Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 28: Disc Or Coulter Gang Bearing
One on each walking beam Type of Lubrication: Grease .eps Quantity: Sparingly and check for endplay 100% If there is a lot of end play take apart, check bearings and re-pack 41641 Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 29: General
Timed detent not set correctly. Set flow for 0.5 after machine is raised. Depth Timed detent not allowing depth stop to engage. Adjust detent timer to allow for depth stop to engage. Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 30: Troubleshooting Coulter/Disc Gang
Rear Leveling” on page 16. Rear Sweep’s Rear Wearing Level machine front to rear with turnbuckle, See “Front to Machine nose up front to rear. Faster Than Rear Leveling” on page 16. Front Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 31: Transport
Replace poppet valve in depth stop. Depth stop failing due to hose routing. Check routing with hydraulic layout, “Pre-Delivery Manual”. Machine Bouncing Excessive speed. Slow down (18 m/h)/(30 km/h). During Transport Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 32: Specifications And Capacities
9.5 LX15 8 PLY 9.5 LX15 8 PLY Horsepower 280-340 320-380 340-400 375+ Kilowatt 208-253 238-283 340-298 279+ Weight can vary by hundreds of pounds depending on options installed. Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 33: Hydraulic Connectors And Torque
12-16 -18 ORB w/jam nut 24-33 18-24 -18 ORB straight 37-53 27-39 -16 JIC 27-41 20-30 -16 ORB w/jam nut 37-58 27-43 -16 ORB straight Great Plains | 550-353M | 2025-04-07 Table of Contents Index... -
Page 34: Torque Values Chart
650-750 Foot-pounds (175 lbs on 4’ cheater). Torque Values Chart Wheel Bolt Torque Values ”-20 (75-85ft-lbs) Wheel Bolt Torque Values ”-18 (80-90ft-lbs) Wheel Bolt Torque Values ”-18 (85-100ft-lbs) Great Plains | 550-353M | 2025-04-07 Table of Contents Index... - Page 35 8321-8552DV Table of Contents Index Appendix Great Plains | 550-353M | 2025-04-07 Table of Contents Index...
- Page 36 8321-8552DV Table of Contents Index Appendix Great Plains | 550-353M | 2025-04-07 Table of Contents Index...
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Page 37: Table Of Contents
......7 sweep/shank .......26 owner assistance ....... 13 transport ........27 electrocution .........7 email, Great Plains ...... 13 parts ........... 23 URLs, tires ..........29 phone number, GP ......14 Great Plains | 550-353M | 2025-04-07 Cover Table of Contents... - Page 38 838-602C, decal ........7 838-603C, reflector .......6 838-611C, decal ........8 838-612C, decal ........7 838-613C, decal .........11 838-614C, reflector .......5 838-615C, reflector .......6 858-910C, decal .........10 858-996C, decal .........10 858-997C, decal .........10 Great Plains | 550-353M | 2025-04-07 Cover Table of Contents...
- Page 39 Table of Contents Index Table of Contents Index...
- Page 40 Table of Contents Index Great Plains, Mfg. 1525 E. North St. P.O. Box 5060 Salina, KS 67402 MADE IN USA WITH U.S. & GLOBAL COMPONENTS...
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