International Harvester 6788
Power
200 hp
Production
1981-1984
Engine
Turbocharged diesel, 6-cylinder
Transmission
Two-range power shift
Weight
16920 lbs [7674 kg]
Drive
4WD
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Introduction
International Harvester 6788 Agricultural Tractor
The International Harvester 6788 is an articulated four-wheel drive tractor produced between 1981 and 1984. Developed in Rock Island, Illinois, this model represents the high-horsepower segment of the era, designed to handle heavy-duty agricultural operations with a focus on traction and operational efficiency.
Engine and Performance
The tractor is powered by a 7.6-liter, 6-cylinder turbocharged diesel engine. This unit generates 200 horsepower (149.1 kW) at a rated speed of 2500 RPM. With a displacement of 466 cubic inches, the engine is configured to provide consistent torque for demanding field tasks such as heavy tillage and large-scale hauling.
Transmission and Drivetrain
The 6788 features a two-range powershift transmission providing 12 forward and 6 reverse gears. The system allows for on-the-move shifting between gear pairs (1/2, 3/4, and 5/6) without the use of the clutch, while the transition between gears 2-3 and 4-5 is synchronized. The vehicle utilizes an articulated steering system combined with four-wheel drive to navigate challenging terrain.
Hydraulics and PTO
The tractor is equipped with a closed-center hydraulic system, delivering a pump flow of 18 gpm (68.1 lpm) and a dedicated steering flow of 12 gpm (45.4 lpm). It supports between two and four valves for implement control. The independent rear PTO is rated at 1000 RPM, providing the necessary power output for high-demand implements.
Operator Environment and Dimensions
The operator platform consists of a standard cab featuring climate control, including heating and air conditioning, to facilitate long-duration work. The tractor has a wheelbase of 110 inches and a shipping weight of 16,920 lbs (7,674 kg). It is fitted with 18.4-38 agricultural tires on both the front and rear axles, offering a ground clearance of 28.4 inches.
Conclusion
With only 347 units produced, the International Harvester 6788 remains a significant piece of machinery for collectors and operators focused on high-horsepower, articulated four-wheel drive performance. Its combination of a powershift transmission and robust hydraulic capacity makes it suitable for intensive field applications.
Production Information of International Harvester, 6788
- Original price was $70,500 in 1984
- Built in Rock Island, Illinois, USA
| Manufacturer | International Harvester |
|---|---|
| Total built | 347 |
Dimension and Tires Information of International Harvester, 6788
| Wheelbase | 110 inches [279 cm] |
|---|---|
| Ground clearance | 28.4 inches [72 cm] |
| Shipping weight | 16920 lbs [7674 kg] |
| Length | 228.3 inches [579 cm] |
| Width | 112 inches [284 cm] |
| Ag front | 18.4-38 |
|---|---|
| Ag rear | 18.4-38 |
Engine Specifications of International Harvester, 6788
- Liquid-cooled
- Turbocharged diesel
- 6-cylinder
| Power | 200 hp [149.1 kW] |
|---|---|
| Displacement | 466 ci [7.6 L] |
| Rated RPM | 2500 |
| Bore/Stroke | 4.30x5.35 inches [109 x 136 mm] |
| Coolant capacity | 34 qts [32.2 L] |
| Oil capacity | 20 qts [18.9 L] |
Transmission Information of International Harvester, 6788
Transmission variants 1
- Left lever selects high, low, or reverse range. Right lever selects gear. On-the-move power shift without the clutch between gear pairs 1/2, 3/4, and 5/6. Synchronized shift (with the clutch) from 2-to-3 and 4-to-5.
| Type | Two-range power shift |
|---|---|
| Gears | 12 forward and 6 reverse |
| Oil capacity | 94.5 qts [89.4 L] |
Mechanical Specs of International Harvester, 6788
- Four-wheel drive
- Articulated power steering
- Cab standard with burgundy finish, heat, and air-conditioning. Optional western finish interior.
Power Information of International Harvester, 6788
| Rear PTO | Independent |
|---|---|
| Rear PTO Type | 1000 |
Hydraulics Specifications of International Harvester, 6788
| Type | Closed center |
|---|---|
| Steering flow | 12 gpm [45.4 lpm] |
| Pump flow | 18 gpm [68.1 lpm] |
| Capacity | 23.6 gal [89.3 L] |
| Valves | 2 to 4 |
Three-Point Hitch of International Harvester, 6788
| Rear Type | III/II |
|---|
Where it sits
With 200 HP, the International Harvester 6788 sits just above 3788 (189 HP) in International Harvester's range. Its power puts it in the 89th percentile of 1980s models in our database (2052 machines).
Frequently asked questions
How much horsepower does the International Harvester 6788 have?
The International Harvester 6788 delivers 200 HP.
What years was the International Harvester 6788 produced?
The International Harvester 6788 was produced in 1981-1984.
What engine does the International Harvester 6788 have?
The International Harvester 6788 is powered by a Turbocharged diesel, 6-cylinder engine.
What transmission does the International Harvester 6788 use?
The International Harvester 6788 uses a Two-range power shift transmission.
How much does the International Harvester 6788 weigh?
The International Harvester 6788 weighs 16920 lbs [7674 kg].
Is the International Harvester 6788 4WD?
The International Harvester 6788 is available in 4WD.