The International Harvester 1066 was a farm tractor built from 1971 to 1976. With a turbocharged six-cylinder diesel of about 105 drawbar and 125 PTO horsepower, it became one of the company’s most popular models: more than 50,000 were built in six years.
International 1066 at a glance
| Maker | International Harvester (Farmall badge) |
|---|---|
| Production | 1971–1976 |
| Engine | DT-414 turbocharged six-cylinder diesel, 6.5 litres |
| Power | 105–108 drawbar hp, about 125 PTO hp |
| Transmission | four-speed plus two-speed range, 16 speeds with torque amplifier |
| Steering | hydrostatic power steering |
| Brakes | dry disc |
| Clutch | hydraulic assist |
| PTO | dual, 540 and 1000 rpm |
| Hydraulics | dual circuits |
| Cabs | ‘Custom’ and ‘Deluxe’, with air conditioning, heating and AM radio |
| Built | over 50,000 |
Written from the English Wikipedia article on the 1066, a single source.
History of the International 1066
The 1066 arrived in 1971 as part of International Harvester’s 66 series, and it quickly became the model most associated with the range. Its DT-414 engine was a direct-start, turbocharged six-cylinder diesel of 6.5 litres, rated at 105 to 108 drawbar horsepower and about 125 PTO horsepower. The engine gained a reputation that went beyond the catalogue figures: stories that some tractors left the factory with more than 150 horsepower were common, and the DT-414 became a favourite of pullers and tuners.
The driveline was built for heavy field work. A non-synchronised four-speed gearbox was combined with a non-synchronised two-speed range, giving sixteen forward speeds when the tractor was fitted with a torque amplifier. The 1066 also had hydrostatic power steering, dry disc brakes, a hydraulically assisted clutch, dual PTO shafts at 540 and 1000 rpm and dual hydraulic circuits — equipment that made it usable with a wide range of implements rather than just a plough.
Two versions were sold. The standard tractor used the turbocharged engine, while a Hydrostatic version offered a stepless transmission and, by common account, noticeably less power. The two were told apart by the decals on the bonnet. When the 1066 was introduced, buyers could choose between the “Custom” cab carried over from the previous series and a new “Deluxe” cab; both could be ordered with air conditioning, heating and an AM radio.
In 1975, faced with John Deere’s new 30 series, International Harvester decided not to replace the 66 series but to update it. The engines gained about five horsepower and the Deluxe cab was revised: one window in each door instead of two, a rear window that opened further and an enlarged lower rear window, with the cab painted red and the roof left white. The 1066 stayed in production until 1976, by which time more than 50,000 had been built — a remarkable total for a tractor of its size and price.
Design and features
- DT-414 diesel: a turbocharged 6.5-litre six rated at about 125 PTO horsepower.
- Sixteen speeds: four-speed gearbox, two-speed range and torque amplifier.
- Dual PTO: 540 and 1000 rpm shafts for different implements.
- Two cabs: the carried-over Custom and the newer Deluxe, both with air conditioning available.
- Hydrostatic option: a stepless transmission version with less power.
International 1066 versions
- 1066 Turbo (1971–1976): the standard model.
- 1066 Hydro: hydrostatic transmission version.
- Custom cab: the earlier cab design, offered from 1973.
- Deluxe cab: revised in 1975 with single-window doors and a larger rear window.
The 1066 belongs to the 66 series, the generation after the Farmall 60 series. Other International Harvester tractors are in the Farmall article and the collection.
Video: 1066 international harvester gettin the ground ready
Video by John Miles on YouTube.
Sources
- International Harvester 1066, English Wikipedia: engine, power, transmission, cabs, updates, production
