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| info | |
| The R3 was a special-order machine for the US Government, based on the Twenty-Eight. |
| Production | |
| Manufacturer: | Caterpillar |
| Factory: | Peoria, Illinois, USA |
| Total built: | 60 |
| Dimensions & Tires | |
| Front tire: | tracks |
| Rear tire: | tracks |
| R3 Serial Numbers | |
| - Serial numbers unknown - |
| Caterpillar R3 Power | |
| Drawbar (tested): | 34.44 hp [25.7 kW] |
| Belt (tested): | 41.99 hp [31.3 kW] |
| Mechanical | |
| Chassis: | crawler |
| Cab: | Open operator station. |
| info | |
| Bore/Stroke: | 4.50x5.50 inches [114 x 140 mm] |
| Fuel system: | Ensign carburetor |
| Air cleaner: | oil bath |
| Rated RPM: | 1100 |
| Engine Detail | |
| Caterpillar, gasoline, 4-cylinder, liquid-cooled, 350 ci [5.7 L] |
| Transmission | |
| Type: | gear |
| Gears: | 3 forward and 1 reverse |
| Clutch: | dry disc |
| Caterpillar R3 Tires | |
| Ag front: | 55-inch tracks |
| Ag rear: | 55-inch tracks |