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| info | |
| 1949 - 1956, Row-Crop tractor | |
| Series next: | Sheppard Diesel SD-4 |
| Series back: | Sheppard Diesel SD-2 |
| Production | |
| Manufacturer: | Sheppard Diesel |
| Factory: | Hanover, Pennsylvania, USA |
| Total built: | 1441 |
| Variants | |
| SD-3: | row-crop |
| SDO-3: | orchard |
| SDG-3: | grove |
| Power Take-off (PTO) | |
| Rear RPM: | 540 |
| Dimensions & Tires | |
| Wheelbase: | 92 inches [233 cm] |
| Weight: | 4196 lbs [1903 kg] |
| Front tire: | 6.00-16 |
| Rear tire: | 11x38 |
| Sheppard Diesel SD-3 Power | |
| Engine: | 32 hp [23.9 kW] |
| Plows: | 3 |
| Mechanical | |
| Chassis: | 4x2 2WD |
| Final drives: | spur gear |
| Steering: | manual |
| Brakes: | mechanical drum |
| Cab: | Open operator station. |
| Belt Pulley | |
| Diameter: | 8.25 inches [20 cm] |
| Width: | 7.5 inches [19 cm] |
| RPM: | 1458 |
| Speed: | 3048 ft/min [929.03 meters/min] |
| info | |
| Bore/Stroke: | 4.00x5.00 inches [102 x 127 mm] |
| Power: | 32 hp [23.9 kW] |
| Fuel system: | indirect injection |
| Compression: | 22:1 |
| Rated RPM: | 1650 |
| Starter type: | electric |
| Engine Detail | |
| Sheppard Diesel 6B, diesel, 3-cylinder, liquid-cooled, 188.5 ci [3.1 L] |
| info | |
| Series next: | Sheppard Diesel SD-4 |
| Series back: | Sheppard Diesel SD-2 |
| Transmission | |
| Type: | gear |
| Gears: | 4 forward and 1 reverse |
| Clutch: | dry disc |
| info | |
| Series next: | Sheppard Diesel SD-4 |
| Series back: | Sheppard Diesel SD-2 |
| Dimensions | |
| Weight: | 4196 lbs [1903 kg] |
| Wheelbase: | 92 inches [233 cm] |
| Length: | 131 inches [332 cm] |
| Height: | 70.25 inches [178 cm] |
| Front tread: | 56 to 80 inches [142 to 203 cm] 9.25/12.75 inches (tricycle) [23/32 cm] |
| Rear tread: | 54 to 82 inches [137 to 208 cm] |
| Sheppard Diesel SD-3 Tires | |
| Ag front: | 6.00-16 |
| Ag rear: | 11x38 |