International Harvester 1066

International Harvester 1066 tractor photo
1971 - 1976
66 Series
Row-Crop tractor
Series map:
Hydro 100
*Estimated engine power for comparison only.
ManufacturerInternational Harvester
Row-Crop tractor
Built in Rock Island, Illinois, USA
Total built54,947
Original price was $21,100 in 1976
The hydrostatic drive 1066 Hydro was later renamed the Hydro 100. This was due to confusion over drawbar horsepower. The hydrostatic drive took a lot of power to operate, and the 1066 Hydro had much less power than a gear-driven 1066. Torque Amplifer (TA) was optional. The 1066 engine was altered in 1973 to increase horsepower.
1066 Hi-Clearhigh-crop
International Harvester 1066 Engine
International Harvester 6.8L 6-cyl diesel
Fuel tank42 gal
159.0 L
Engine details ...
International Harvester 1066 Transmissions
8-speed gear
16-speed two-speed power shift
Transmission details ...
International Harvester 1066 Power
Drawbar (claimed)108 hp
80.5 kW
PTO (claimed)126 hp
94.0 kW
Drawbar (tested)105.95 hp
79.0 kW
PTO (tested)125.68 hp
93.7 kW
Performance test details ...
Two- or four-wheel drive
Power steering
Hydraulic dry disc brakes
Open operator station. Two-post fixed ROPS available. Cab available with optional air-conditioning.
Typeopen center
Pump flow12 gpm
45.4 lpm
Total flow21 gpm
79.5 lpm
Steering flow9 gpm
34.1 lpm
Tractor hitch
Rear TypeIII/II
Rear lift (at 24"/610mm)5600 lbs
2540 kg
Power Take-off (PTO)
Rear PTOindependent
Rear PTO Type540/1000
Dimensions & Tires
Wheelbase105 inches
266 cm
Weight12148 to 13345 pounds
Front tire11L-15
Rear tire18.4-38
Full dimensions and tires ...
1066 Serial Number Location
International Harvester 1066 serial number location
Serial number plate on the left side of the tractor's clutch housing.
1066 Serial Numbers

FAQ: How to read a serial number table.
1066 references literature
1066 Turbo Tractor published in 1971, by International Harvester
1066 Hydrostatic Tractor published in 1971, by International Harvester
766, 966, 1066 and 1466 Tractors published in 1972, by International Harvester
766, 966, 1066 and 1466 Tractors published in 1973, by International Harvester
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Peter Easterlund - owner/author
Updated on August 8, 2023
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