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| info | |
| Torque amplifier was an option. In 1973, the hydrostatic version of the 666 was renamed the 70 Hydro. |
| Production | |
| Manufacturer: | International Harvester |
| Total built: | 9,367 |
| Original price (USD): | $11,875 |
| Rear Hitch | |
| Type: | IH Fast Hitch |
| 3-Point Hitch | |
| Rear Type: | II |
| Power Take-off (PTO) | |
| Rear PTO: | independent |
| Rear RPM: | 540 |
| Dimensions & Tires | |
| Wheelbase: | 103 inches [261 cm] |
| Weight: | 7053 lbs [3199 kg] |
| Front tire: | 7.50-16 |
| Rear tire: | 15.5-38 |
| 666 Serial Numbers | |
| Location: | Clutch housing, right side |
| International Harvester 666 Power | |
| Drawbar (tested): | 58.01 hp [43.3 kW] |
| PTO (tested): | 69.61 hp [51.9 kW] |
| Mechanical | |
| Chassis: | 4x2 2WD |
| Steering: | hydrostatic power |
| Brakes: | dry disc |
| Cab: | Open operator station. Two-post ROPS or canpoy optional. |
| Battery | |
| Volts: | 12 |
| info | |
| Bore/Stroke: | 3.875x4.410 inches [98 x 112 mm] |
| Air cleaner: | dual stage dry |
| Compression: | 17:1 |
| Rated RPM: | 2000 |
| Starter volts: | 12 |
| Engine Detail | |
| International Harvester D312, diesel, 6-cylinder, liquid-cooled, 312 ci [5.1 L] |
| info | |
| Previous model: | International Harvester 656 |
| Next model: | International Harvester 686 |
| Transmission | |
| Transmission: | sliding gear |
| Gears: | 5 forward and 1 reverse |
| info | |
| Previous model: | International Harvester 656 |
| Next model: | International Harvester 686 |
| Dimensions | |
| Weight: | 7053 lbs [3199 kg] |
| Wheelbase: | 103 inches [261 cm] |
| International Harvester 666 Tires | |
| Ag front: | 7.50-16 |
| Ag rear: | 15.5-38 |