The International Harvester 1066, sold as the Farmall 1066, was a farm tractor made from 1971 to 1976. Its turbocharged six-cylinder diesel gave about 105 drawbar and 125 PTO horsepower, and more than 50,000 were built in six years, making it one of International’s most successful large tractors.
International 1066 at a glance
| Maker | International Harvester |
|---|---|
| Production | 1971–1976 |
| Built | over 50,000 |
| Engine | DT-414 turbocharged six-cylinder diesel, 6.5 litres |
| Power | about 105 drawbar and 125 PTO horsepower |
| Transmission | four-speed with a two-speed range; sixteen forward speeds with Torque Amplifier |
| Steering and brakes | hydrostatic power steering, dry disc brakes |
| Hydraulics | dual hydraulics; dual PTO at 540 and 1000 rpm |
| Cabs | Custom, carried over from the previous series, and Deluxe |
| Versions | standard turbocharged 1066 and 1066 Hydro with a hydrostatic transmission |
| Update | 1975: about five more horsepower and a revised Deluxe cab |
Based on one source (English Wikipedia).
History of the International 1066
Launch in 1971
The 1066 arrived in 1971 as part of International’s 66 series. It used the DT-414, a turbocharged six-cylinder direct-start diesel of 6.5 litres producing 105 to 108 drawbar horsepower and about 125 PTO horsepower. Two cabs were offered from the start: the Custom, carried over from the previous series, and the Deluxe; both could be ordered with air conditioning, heating and an AM radio. The tractor had hydrostatic power steering, dry disc brakes, a hydraulically assisted clutch and dual hydraulics, with dual power take-offs at 540 and 1,000 rpm. The gearbox was a non-synchronised four-speed with a non-synchronised two-speed range, giving sixteen forward speeds when the Torque Amplifier was fitted.
Two versions
Buyers could choose the standard turbocharged 1066 or the 1066 Hydro with a hydrostatic transmission; the two were told apart by the decals on the hood. The hydrostatic version is generally described as having considerably less power than the turbocharged tractor. In 1973 the Custom cab was released and the hydrostatic transmission became available as an option. The DT-414 acquired a reputation as a strong engine, and it has been claimed that some tractors left the factory with well over 150 horsepower, though figures like that were never official.
The 1975 update
When John Deere introduced its 30 series in 1975, International chose not to replace the 66 series but to give it a tune-up. Power rose by about five horsepower, and the Deluxe cab was revised: it received a single window in each door instead of two, a rear window that opened further and a larger lower rear window. The cab was now painted red all over, with the roof still white. Production ended in 1976 after six years and more than 50,000 tractors, a total that made the 1066 one of the most popular models International ever built.
Design and features
- DT-414 diesel: a 6.5-litre turbocharged six of about 125 PTO horsepower.
- Torque Amplifier: with it the tractor had sixteen forward speeds, all from a simple four-speed box.
- Two cabs: the older Custom and the roomier Deluxe, both available with air conditioning and radio.
- Hydrostatic option: the 1066 Hydro, quieter to drive but noticeably less powerful.
- Big production: more than 50,000 built in six years.
International 1066 versions
- 1066 (1971–1976): the standard turbocharged tractor.
- 1066 Hydro (1973–1976): hydrostatic transmission version.
- Custom cab: the simpler cab carried over from the previous series.
- Deluxe cab: revised for 1975 with one window per door and a larger rear window.
The 1066 was the big brother of the Farmall Cub, International’s smallest tractor. More International vehicles are in the International collection.
Sources
- International Harvester 1066, English Wikipedia: engine, power, cab, production
