Introduction
International Harvester 666 Row-Crop Tractor
The International Harvester 666 is a row-crop tractor produced between 1972 and 1976 in Rock Island, Illinois. Designed for versatility in agricultural operations, this two-wheel-drive model was available with various transmission configurations to suit different field requirements.
Engine and Performance
The tractor is powered by the International Harvester C291, a 6-cylinder liquid-cooled gasoline engine with a displacement of 291 cubic inches (4.8 liters). It operates at a rated speed of 2000 RPM, delivering 75 gross horsepower (55.9 kW). The engine features a dual-stage dry air cleaner and a compression ratio of 7.5:1.
Transmission and Drivetrain
The 666 offers three distinct transmission options: a 5-speed sliding gear transmission, a hydrostatic transmission providing infinite forward and reverse speeds, or a 10-speed transmission equipped with a two-speed 'Torque-Amplifier' power shift. All models utilize a dry disc clutch system.
Hydraulics and Hitch
The hydraulic system utilizes an open-center design with a pump flow capacity of 12 gallons per minute (45.4 liters per minute). It is equipped with a Type II rear hitch and the proprietary IH Fast Hitch system, allowing for efficient integration of various agricultural implements.
Dimensions and Operator Environment
With a wheelbase of 103 inches (261 cm), the tractor provides a stable platform for row-crop work. The front tread is adjustable from 56 to 80 inches, while the rear tread ranges from 50 to 96 inches. The operator station is open by default, with optional two-post ROPS or a canopy; a factory-fitted cab with air conditioning was also available.
Conclusion
With 9,367 units built during its production run, the International Harvester 666 serves as a reliable mid-range tractor. Its combination of adjustable tread widths, multiple transmission choices, and flexible hydraulic capabilities makes it well-suited for diverse row-crop applications.
Production Information of Farmall, 666
- Row-Crop tractor
- Built in Rock Island, Illinois, USA
| Manufacturer | Farmall (a part of International Harvester) |
|---|---|
| Original price | $11,875 |
| Total built | 9,367 |
Dimension and Tires Information of Farmall, 666
| Rear tread | 50 to 96 inches [127 to 243 cm] |
|---|---|
| Wheelbase | 103 inches [261 cm] |
| Shipping weight | 6780 lbs (gas gear) [3075 kg] |
| Height (steering wheel) | 77 inches [195 cm] |
| Length | 161 inches [408 cm] |
| Clearance (drawbar) | 14 inches [35 cm] |
| Clearance (drawbar)(optional) | 7420 lbs (diesel hydro) [3365 kg] |
| Width | 87 inches [220 cm] |
| Front tread | 56 to 80 inches [142 to 203 cm] |
| Front tread | 50 to 74 inches [127 to 187 cm] |
| Clearance (front axle) | 21 inches [53 cm] |
| Ag front | 7.50-16 |
|---|---|
| Ag rear | 15.5-38 |
Engine Specifications of Farmall, 666
- International Harvester C291
- Liquid-cooled
- Gasoline
- 6-cylinder
| Starter volts | 12 |
|---|---|
| Displacement | 291 ci [4.8 L] |
| Air cleaner | Dual stage dry |
| Bore/Stroke | 3.75x4.39 inches [95 x 112 mm] |
| Coolant capacity | 21 qts [19.9 L] |
| Coolant capacity | 21 qts [19.9 L] |
| Rated RPM | 2000 |
| Compression | 7.5:1 |
| Power (gross) | 75 hp [55.9 kW] |
Transmission Information of Farmall, 666
Transmission variants 1
| Transmission | Sliding gear |
|---|---|
| Gears | 5 forward and 1 reverse |
Transmission variants 2
| Type | Hydrostatic |
|---|---|
| Gears | Infinite forward and reverse |
Transmission variants 3
| Transmission | Torque-Amplifier |
|---|---|
| Clutch | Dry disc |
| Type | Two-speed power shift |
| Gears | 10 forward and 2 reverse |
- 5-speed
- Hydrostatic
- 10-speed two-speed power shift
Mechanical Specs of Farmall, 666
- Two-wheel drive
- Open operator station. Two-post ROPS or canopy optional. Cab available with air-conditioning.
- Power steering
- Dry disc brakes
Power Information of Farmall, 666
| Rear PTO | Independent |
|---|---|
| Rear PTO Type | 540 (1.375) |
Hydraulics Specifications of Farmall, 666
| Type | Open center |
|---|---|
| Pump flow | 12 gpm [45.4 lpm] |
Three-Point Hitch of Farmall, 666
| Rear Type | II |
|---|---|
| Type | IH Fast Hitch |
Electrical System of Farmall, 666
| Charging system | Alternator |
|---|---|
| Battery volts | 12 |
Where it sits
With 75 HP, the Farmall 666 sits between 656 (70 HP) and 756 (85 HP) in Farmall's range. Its power puts it in the 55th percentile of 1970s models in our database (1259 machines).
Frequently asked questions
How much horsepower does the Farmall 666 have?
The Farmall 666 delivers 75 HP.
What years was the Farmall 666 produced?
The Farmall 666 was produced in 1972-1976.
What engine does the Farmall 666 have?
The Farmall 666 is powered by a Gasoline, 6-cylinder engine.
What transmission does the Farmall 666 use?
The Farmall 666 uses a Sliding gear transmission.
How much does the Farmall 666 weigh?
The Farmall 666 weighs 6780 lbs (gas gear) [3075 kg].
Is the Farmall 666 4WD?
The Farmall 666 is available in 2WD.