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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
HT1110-20 & HT1110-25
Manufacturing, Inc.
www.greatplainsmfg.com
Printed 2025-03-03
Index
Terra-Max®
TP-77295
EN
588-205M
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Table of Contents
Related Manuals for GREAT PLAINS Terra-Max HT1110-20
Summary of Contents for GREAT PLAINS Terra-Max HT1110-20
- Page 1 Table of Contents Index Operator Manual HT1110-20 & HT1110-25 Terra-Max® 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. Your life and the lives of others depend on it! TP-77295 Illustrations may show optional equipment not supplied with standard unit.
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Page 2: Machine Identification
Table of Contents Index 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: Table Of Contents
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: Introduction
Table of Contents Index Introduction Introduction Great Plains welcomes you to our growing family of new product owners. The Terra Max® HT1110 has been designed with care and built by skilled workers using quality materials. Proper setup, maintenance, and safe operating practices will help you get years of satisfactory use from the machine. -
Page 5: Owner Assistance
Model Number:__________________________ 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 6: Safety Information
4. Replace chain if any links or end fittings are broken, machine parts, or nearby property. stretched or damaged. 5. Do not use safety chain for towing. Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 7: Avoid High Pressure Fluids
Use a safety cage if available. 2. When removing and installing wheels, use wheel- handling equipment adequate for weight involved. 4Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M4... -
Page 8: Transport Machinery Safely
5. Install transport lock onto lift cylinders then lower implement on locks to relieve pressure on hydraulic hoses. 6. Detach the tractor. Secure the implement using blocks. Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 9: Safety At All Times
10. Watch out for wires, trees, etc., when folding and raising the implement. 11. Turning tractor too tight can cause hitched implement to ride up on wheels. This can result in injury or equipment damage. 6Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M6... -
Page 10: Safety Decals
Keep all safety decals clean and legible. being careful not to cause air bubbles under decal. Replace all damaged or missing decals. Order new decals from your Great Plains dealer. Refer to this section for proper decal placement. 818-055C... -
Page 11: Orange Reflector
Stay away from power lines when transporting, extending or folding implement. Electrocution can occur without contacting power lines. 838-599C Danger: Electrocution Hazard TP-42243 On middle of hitch; 1 total 8Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M8... -
Page 12: Tongue Rising
WARNING To prevent serious injury or death: Tongue rises rapidly when unhitched from tractor. Lower implement to ground before unhitching. 838-606C Tongue Rising TP-42243 On front of hitch; 1 total Great Plains | 588-205M | 3/3/25 Table of Contents Index... - Page 13 Keep Wing Safety Pins in Place Until Cylinder & Lines Are Full of Oil & Free of Air 838-612C Warning: Wings Could Fall On front of wing rest; TP-69939 2 total 10Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M10...
- Page 14 Inflation or Torquing of Wheel Bolts: Maximum inflation pressure of tires is 44 psi. Torque wheel bolts to 80-90lb-ft. 858-996C Caution: Tire Pressure On sides gauge wheels; TP-43099 2 total Great Plains | 588-205M | 3/3/25 Table of Contents Index...
- Page 15 MINIMUM MACHINE HEIGHT AND SUPPORT WEIGHT OF MACHINE IN THE EVENT OF HYDRAULIC FAILURE. 838-613C Warning: Wings Could Fall On sides of lift links; TP-69939 2 total 12Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M12...
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Page 16: Adjustments And Installation
Refold the machine slowly, then lock wings and close wing lock valve. Always place wing locks in locked position when moving from field to field. Put transport locks into place. You are now ready to go to the field. Great Plains | 588-205M | 3/3/25 Table of Contents... -
Page 17: Hitching Terra Max® To Tractor
Lock drawbar swing to center position to minimize any side-to-side sway to assure proper tracking in the field, and safe road travel. See “Transport” on page 27, for safe transporting. 14Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M14... -
Page 18: Clevis Hitch
V-block (87) forward of the cushions and check the size of the resulting pinning hole. Remove a cushion if needed. 3. Add the top plate (89). Secure from below with Grade 5 bolt (47). Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 19: Electrical Hookup
Make connections prior to machine movement. Hydraulic Hose Hookup Color Hydraulic Function Great Plains hydraulic hoses are color coded to help you hookup hoses to your tractor outlets. Hoses that go to Black Lift (2 hoses) the same remote valve are marked with the same color. -
Page 20: Transport Locks
14. Once the machine is unfolded, raise and lower the machine several times to purge air from the lift system. Again, watch for any leaks and tighten if necessary. Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 21: Pre-Leveling Of Machine
The lights must be connected to change the system using the switch. 18Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M18... -
Page 22: Leveling
Switch hydraulic to the float position. 10. If wings are running too high, increase hydraulic down pressure setting, too low, decrease down pressure setting. See “Hydraulic Down Pressure” on page 23. Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 23: First Time Field Adjustments
“FLOAT” position before the wings can flex over terrain in the raised or lower lift position. 20Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M20... -
Page 24: Gang Cylinders
10. Re-install pin (7) after adjustment is made. Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 25: Fore/Aft Leveling
This will improve trash flow and increase the leveling capability. 22Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M22... -
Page 26: Hydraulic Down Pressure
1 full second after full raise. If it runs longer than this, damage to the seals of the lift cylinders may result. Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 27: Wing Down Pressure
587-185K (5) is installed in the rear position, 587-186K (6) is installed in the front position. Refer to the Parts Manual or the Assembly Manual for location and part breakdown. 24Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M24... -
Page 28: Attachments (Optional)
(6-8 mph) and set wing fold system to “FLOAT”. When operating gangs in the straight position, speed up (8-10 mph) and set the wing fold system to active hydraulic down pressure. Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 29: Setting The Rolling Harrow
Fore/Aft - Machine must be level front to rear to ensure all blades are working at the same depth • Finish Reel Down Pressure - Start in Float position, increase to 200-300 PSI is pressure is desired • Operating Speeds - 7-9 MPH 26Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M26... -
Page 30: Operating Instructions
150% of the towing vehicle (transport vehicle must weigh at least 67% of implement). Ensure that the towing vehicle is adequate for the task. Using an inadequate Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 31: Final Checklist
Secure wings with wing locks Place locking valve and transport locks in transport positions Lower implement on to transport locks Lights ON for transport 28Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M28... -
Page 32: Hydraulic Down Pressure
Resume applying down pressure when disks are returned to a vertical position. CAUTION: Field Hazard Down pressure applied to wings while gangs are angled causes overly aggressive and uneven tilling of soil. Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 33: Options
15. Torque x 2 GR. 8 bolts (10) to 375ft lbs to be sure bolts do not work loose and cause damage to the machine. 30Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M30... -
Page 34: Parking
If machine is stored outdoors over the winter months, it is a good idea to fold the machine then set it down on the ground so all the cylinders are retracted to protect the cylinder rods. This will extend the life of the cylinder seals and reduce internal and external leaks. Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 35: Maintenance And Lubrication
6. Check drag bolts for looseness or excessive wear. Your drag is an important part of the tillage operation. 32Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M32... -
Page 36: Gang Angle Adjustment
14. Remove bolt (1) from either end of gauge link (2) and turn threaded end (3) until indicator (4) reads 0 degrees. 15. Re-install bolt (1) to secure gauge link. Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 37: Lubrication
1 zerk on each hub; 6-8 total Type of Lubrication: Grease Quantity: Sparingly. Do Not Over Grease, may cause damage to seal. Repack wheel bearings annually or every 2500 acres. 34Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M34... -
Page 38: Troubleshooting
Machine will not lift evenly: (Black Trace hydraulic plumbing to confirm proper routing. Hand grips) Replace hydraulic tips on lift hoses. Call your GP representative for cylinder diagnostics. Call your GP representative. Great Plains | 588-205M | 3/3/25 Table of Contents Index... - Page 39 Re-phase gang cylinders, be sure to completely extend and retract both cylinders when Machine is side drafting doing this. Check wing tire adjustment is equal. Call your GP representative to further diagnose if needed. 36Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M36...
- Page 40 Check the connections to the retract and light harness. If the connections are correct, check the function of the double and single solenoid valves. Wings not folding Reference Hydraulic layouts. Great Plains | 588-205M | 3/3/25 Table of Contents Index...
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Page 41: Appendix
ManufacturerWeb site Transport/ 52 psi 12.5L X 15 12Ply Firestonewww.firestoneag.com Wings (358 kPa) Gleasonwww.gleasonwheel.com Titanwww.titan-intl.com Gauge 44 psi 9.5L X 15 8Ply Galaxywww.atgtire.com (303 kPa) Wheel BKTwww.bkt-tire.com 38Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M38... -
Page 42: Torque Values Chart
Gang Bolt Torque 1 3/4”-5 850 Foot-pounds (165 lbs on 5’ cheater). Rolling Harrow Spike Bolt 1 1/2”-6 650-750 Foot-pounds (175 lbs on 4’ cheater). Wheel Bolt Torque Values 5/8”-18 (170ft-lbs) 3/4”-16 (295ft-lbs) Great Plains | 588-205M | 3/3/25 Table of Contents Index... -
Page 43: Hydraulic Connectors And Torque
-18 ORB w/jam nut 24-33 18-24 -18 ORB straight 37-53 27-39 -16 JIC -16 ORB w/jam nut 27-41 20-30 -16 ORB straight 37-58 27-43 40Great Plains | 588-205M | 3/3/25 Table of Contents Index Great Plains | 588-205M40... - Page 44 Great Plains reserves the right to make changes in materials or design of the product at any time without notice. The warranty shall not be interpreted to render Great Plains liable for damages of any kind, direct or consequential or contingent to property.
- Page 45 .......39 848-271C ........8 medical assistance ... 4 tilling, ending........28 decal replacement ........7 model number ........2 tire inflation .........38 decals tires ............4 caution torque values chart (wheel bolts)..39 Great Plains | 588-205M | 2025-03-03 Cover Table of Contents...
- Page 46 838-612C, decal .........10 838-613C, decal .........12 838-614C, red reflector ......7 838-615C, amber reflector ....7 858-996C, decal .........11 858-997C, decal .........12 890-798C, clevis .........15 9.5L X 15 8Ply ........38 42Great Plains | 588-205M | 2025-03-03 Cover Table of Contents Great Plains | 588-205M42...
- Page 47 Table of Contents Index Table of Contents Index...
- Page 48 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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