Caterpillar R2: all source data
All 57 values recorded for this model, as the source lists them and in its units. The spec sheet shows the same data checked, typed and converted.
Overview
Production| Manufacturer | Caterpillar |
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| (no label) | Agricultural Crawler tractor |
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| (no label) | Built in Peoria, Illinois, USA |
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| Total built | 2418 (total) |
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| Total built | 83 (5E) |
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| Total built | 1185 (4J) |
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| Total built | 1150 (6J) |
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Engine| (no label) | Caterpillar 4.1L 4-cyl gasoline |
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| (no label) | Caterpillar 3.6L 4-cyl gasoline |
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| Fuel tank | 20 gal | 75.7 L |
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Transmission| (no label) | 3-speed gear |
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| (no label) | 5-speed gear |
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Power| Drawbar (tested) | 27.15 hp | 20.2 kW |
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| Belt (tested) | 32.47 hp | 24.2 kW |
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Mechanical| Drive | crawler |
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| (no label) | Open operator station. |
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Dimensions| Weight | 6350 lbs | 2880 kg |
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| (no label) | 13-inch tracks |
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Serial location| (no label) | Serial number plate on the left side of the R-2 engine, below the rear spark plug. |
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Belt pulley| Diameter | 10.5 inches | 26 cm |
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| Width | 6.5 inches | 16 cm |
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| RPM | 950 |
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Engine
Engine options| (no label) | Caterpillar 4.1L 4-cyl gasoline |
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| (no label) | Caterpillar 3.6L 4-cyl gasoline |
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Engine detail| (no label) | Caterpillar |
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| (no label) | gasoline |
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| (no label) | 4-cylinder |
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| (no label) | liquid-cooled |
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| (no label) | Original engine, used on the 5E version. |
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| Displacement | 251 ci | 4.1 L |
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| Bore/Stroke | 4.00x5.00 inches | 102 x 127 mm |
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| Air cleaner | oil bath |
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| Rated RPM | 950 |
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| (no label) | Caterpillar 3400G |
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| (no label) | gasoline |
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| (no label) | 4-cylinder |
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| (no label) | liquid-cooled |
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| (no label) | The 3400G was used on the 4J and 6J versions, which were most R-2 tractors built. |
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| Displacement | 221 ci | 3.6 L |
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| Bore/Stroke | 3.75x5.00 inches | 95 x 127 mm |
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| Air cleaner | oil bath |
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| Rated RPM | 1525 |
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| Oil capacity | 12 qts | 11.4 L |
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| Coolant capacity (Coolant) | 28 qts | 26.5 L |
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Transmission
Transmission options| (no label) | 3-speed gear |
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| (no label) | 5-speed gear |
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Transmission| Type | gear |
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| Gears | 3 forward and 1 reverse |
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| (no label) | The three-speed was used on the 5E version, built in limited quantities until 1938. |
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| Type | gear |
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| Gears | 5 forward and 1 reverse |
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| Oil capacity | 8 qts | 7.6 L |
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| (no label) | The five speed transmission was used on the R-2 4J and R-2 6J. |
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Dimensions
Tracks| Width | 13 inches | 33 cm |
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Dimensions| Shipping weight | 6350 lbs | 2880 kg |
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| Gauge | 40 inches | 101 cm |
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| Gauge | 50 inches | 127 cm |
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