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| info | |
| 1983 - 1984, Utility tractor | |
| Series next: | Hesston 766 |
| Series back: | Hesston 566 |
| Production | |
| Distributor: | Hesston |
| Manufacturer: | Fiat |
| Factory: | Modena, Italy |
| Original price (USD): | $19,600 (1984) |
| Variants | |
| 666DT: | 4WD |
| 666HC: | high-crop |
| Capacity | |
| Fuel: | 19.2 gal [72.7 L] |
| 3-Point Hitch | |
| Rear Type: | I/II |
| Power Take-off (PTO) | |
| Rear PTO: | independent |
| Rear RPM: | 540 |
| Dimensions & Tires | |
| Wheelbase: | 90.7 inches [230 cm] (2WD), 88.5 inches [224 cm] (4WD) |
| Weight: | 5689 to 6350 pounds |
| Front tire: | 7.50-16 |
| Rear tire: | 14.9-30 |
| 666 Serial Numbers | |
| - Serial numbers unknown - |
| Hesston 666 Power | |
| Drawbar (claimed): | 54.3 hp [40.5 kW] |
| PTO (claimed): | 62 hp [46.2 kW] |
| Drawbar (tested): | 53.13 hp [39.6 kW] |
| PTO (tested): | 62.40 hp [46.5 kW] |
| Mechanical | |
| Chassis: | 4x2 2WD, 4x4 MFWD 4WD (666DT) |
| Steering: | hydrostatic power |
| Brakes: | differential mechanical wet disc |
| Cab: | Four-post ROPS standard. Optional canopy. |
| Hydraulics | |
| Type: | open center |
| Pressure: | 2700 psi [186.2 bar] |
| Valves: | 1 or 2 |
| Pump flow: | 11 gpm [41.6 lpm] |
| Electrical | |
| Charging system: | alternator |
| Charging amps: | 33 |
| info | |
| Bore/Stroke: | 3.94x4.33 inches [100 x 110 mm] |
| Starter volts: | 12 |
| Engine Detail | |
| Fiat 8045.02, diesel, 4-cylinder, liquid-cooled, 211 ci [3.5 L] |
| info | |
| Series next: | Hesston 766 |
| Series back: | Hesston 566 |
| Transmission | |
| Type: | synchronized |
| Gears: | 12 forward and 4 reverse |
| Four synchronized gears in three ranges. | |
| info | |
| Series next: | Hesston 766 |
| Series back: | Hesston 566 |
| Dimensions | |
| Weight (operating): | 5,689 lbs [2580 kg] (2WD), 6,350 lbs [2880 kg] (4WD) |
| Wheelbase: | 90.7 inches [230 cm] (2WD), 88.5 inches [224 cm] (4WD) |
| Length: | 139 inches [353 cm] (2WD), 143 inches [363 cm] (4WD) |
| Height (hood): | 59 inches [149 cm] |
| Height (exhaust): | 96 inches [243 cm] (2WD), 97 inches [246 cm] (4WD) |
| Ground clearance: | 23 inches [58 cm] (2WD front axle), 19 inches [48 cm] (4WD front axle), 16 inches [40 cm] (4WD front differential) |
| 2WD turn radius: | 12.5 feet [3.8 m] |
| 4WD turn radius: | 18.5 feet [5.6 m] |
| Hesston 666 Tires | |
| Ag front: | 7.50-16 (2WD), 9.5-24 (4WD) |
| Ag rear: | 14.9-30 |