Case IH Heavy-Offset 790 All-purpose, Rigid

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Innovative Design
Case IH Heavy-Offset 790 disk harrows feature state-of-the-art engineering and construction. The machines offer unmatched ruggedness, dependability and consistent performance over years of use. All models are built with:

  • A mainframe of welded steel tubing
  • Square, steel, arbor bolts
  • Nodular iron spools
  • High-capacity bearings
  • Easy gang adjustments
  • Self-leveling hitch
  • Mechanical depth control


Nodular Iron Spools
Unlike steel-fabricated spools on other brands, Case IH cast nodular iron spools:

  • Resist compression up to 20 tons without loosening blades
  • Add greater blade support with bell-shaped design
  • Provide better residue flow with hourglass middle


High-Capacity Bearings
Flangent and Cushion Gang® bearings feature:

  • Finely ground inner rings
  • Heavy steel sleeves that distribute shock loads along the arbor bolt


All bearings are:

  • Regreasable for extended life
  • Triple sealed to repel debris and moisture


Easy Gang Adjustments

  • Gang angle: Adjustable from 34 – 46 degrees; Adjusts without tools
  • Rear gangs: Adjust laterally to changing field conditions; Line up with front gang furrows as desired
  • Easy-turning crank; Fine-tunes front-to-rear leveling


Self-Leveling Hitch

Self-leveling hitch

  • Exclusive to the Heavy-Offset 790 disk harrows
  • Keeps gangs working at uniform depth from front to rear
  • Transfers weight between tractor and disk
  • Allows even soil penetration on hills


Spring-cushioned hitch

  • Helps ease blades over obstructions


Convenient dial

  • Centers disk behind tractor
  • Minimizes draft
  • Adjusts by simply pulling pin and repositioning hitch


Mechanical Depth Control

Mechanical depth control

  • Provides accurate, repeatable depth


Pin-type adjustment

  • Makes depth control convenient, quick and reliable
  • Eliminates risk of hydraulic leakage affecting disk depths
  • Repeatable accuracy


Earth Metal® Blades for Exceptional Endurance
All Case IH Heavy-Offset 790 disk harrows are equipped with Earth Metal blades. Uniquely formed and heat treated, Earth Metal blades offer exceptional endurance and break resistance for longer equipment life. The notched blades aggressively cut residue and vegetation with excellent cut uniformity.


Earth Metal® blades actually resharpen as they wear.

  • Provides superior cutting performance over an extended blade life
  • Helps prevent down time and maintenance labor
  • Lowers blade replacement cost

The performance of Earth Metal blades actually improves as they are used, while conventional blades lose their sharpness with wear.

Long-Life Durability

Compared to conventional blades under identical conditions, Earth Metal® blades:

  • Are 30% stronger
  • Last up to 20% longer
  • Resist stress fractures
  • Feature shallow-concavity design for easier pulling than conical or spherical blades and promotes better fuel economy


Model Heavy-Offset 790 All-purpose, Rigid
Disk harrow type, Tandem or Offset Offset
Folding (Multi-Section) or Non-Folding Non-Folding
Dimensions and Weights  
Working width, minimum,ft-in (m) 11' 5" (3.48)
Working width, maximum, ft-in (m) 19' 9" (6.02)
Transport width, minimum, ft-in (m) 13' 0" (3.96)
Transport width, maximum, ft-in (m) 22' 7" (6.88)
Transport height, minimum, ft-in (m) np
Transport height, maximum, ft-in (m) np
Total weight, minimum, lb (kg) 8,000 (3629)
Total weight, maximum, lb (kg) 10,800 (4900)
Sizes available, number of widths 4
Disk Blades  
Disk blade spacing, in (mm) 10.5 (267)
Disk blade diameter, in (mm) 28 (711)
Disk blade thickness, in (mm) 0.256 or 0.315 (6.5 or 8)
Blade edge profile Notched
Optional blade edge profile Smooth
Blade concavity np
Disk Gang Mounting and Angles  
Gang mounting to frame Fixed
Frame left to right flexibility, rigid or flexible Rigid
Front gang angle, degrees 34 to 46 included angle
Rear gang angle, degrees 34 to 46 included angle
Disk Gang Components  
Disk bearings Self-aligning, cartridge type ball bearings
Gang arbor bolts, in (mm) 1.5 (38) square carbon steel
Disk spool diameter, in (mm) 6 (152)
Disk blade scraper, type Spring type, adjustable
Wheels and Tires  
Transport wheel mounting Two sets of side-by-side tires with axles on rockshaft wheel arms
Transport tires 12.5L x 15FI
Optional transport tires 31-13.5 x 15 terra rib
Wing wheel mounting No wing wheels
Wing tires No wing wheels
Hookup to tractor, mounted or pull-type Pull - Type
Depth and Level Adjustment  
Typical operating depth, in (mm) 11.2 (284)
Depth control Mechanical std / Hydraulic opt
Fore/aft leveling Turnbuckle with locking pin
Tractor Power Requirements  
Required power, hp/ft (kw/m) 12 to 17 (29 to 42)
Sales Literature  
Literature Number CIH2020405
Literature Date 2/1/2004
Other Documentation  
Document Number SP-3041-08
Document Date 8/1/2008
Status and Entry Dates  
Manufacturing status Current
First Entry Date 1/1/2009
Revision Date 7/1/2011
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