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| info | |
| 1971 - 1976 66 Series, Row-Crop tractor |
| Production | |
| Manufacturer: | International Harvester |
| Factory: | Rock Island, Illinois, USA |
| Total built: | 10,799 |
| Original price (USD): | $13,400 (1976) |
| Capacity | |
| Fuel: | 37 gal [140.0 L] |
| 3-Point Hitch | |
| Rear Type: | 2 |
| Power Take-off (PTO) | |
| Rear PTO: | independent |
| Rear RPM: | 540, 1000 |
| Dimensions & Tires | |
| Wheelbase: | 102.7 inches [260 cm] |
| Weight: | 10300 to 11880 pounds |
| Front tire: | 9.5L-15 |
| Rear tire: | 18.4-34 |
| 766 Serial Numbers | |
| Location: | Left side of clutch housing |
| International Harvester 766 Power | |
| Drawbar (tested): | 73.37 hp [54.7 kW] |
| PTO (tested): | 85.45 hp [63.7 kW] |
| Mechanical | |
| Chassis: | 4x2 2WD |
| Steering: | hydrostatic power |
| Brakes: | hydraulic dry disc |
| Cab: | Open operator station. Cab optional. |
| Hydraulics | |
| Type: | open center |
| Pump flow: | 12 gpm [45.4 lpm] |
| Battery | |
| Volts: | 12 |
| info | |
| Bore/Stroke: | 3.75x4.39 inches [95 x 112 mm] |
| Air cleaner: | dual stage dry |
| Rated RPM: | 2400 |
| Starter volts: | 12 |
| Engine Detail | |
| International Harvester C291, gasoline, 6-cylinder, liquid-cooled, 291 ci [4.8 L] |
| Transmission | |
| Type: | sliding gear |
| Gears: | 8 forward and 4 reverse |
| Clutch: | dry disc |
| Four gears (1-4) in low and high ranges. | |
| Dimensions | |
| Weight (operating): | 10,300 lbs [4672 kg] |
| Weight (ballasted): | 11,880 lbs [5388 kg] |
| Wheelbase: | 102.7 inches [260 cm] |
| Front tread: | 60 to 84 inches [152 to 213 cm] |
| Rear tread: | 56 to 100 inches [142 to 254 cm] |
| International Harvester 766 Tires | |
| Ag front: | 9.5L-15 |
| Ag rear: | 18.4-34 |