Caterpillar

Caterpillar R2

The Caterpillar R2 is an agricultural crawler tractor produced from 1934 to 1942 by Caterpillar in Peoria, Illinois, USA. A total of 2418 units were built in three main versions: 5E, 4J, and 6J. It features crawler drive with an open operator station. Engine options include a 4.1L 4-cylinder gasoline engine used on the 5E version and a 3.6L 4-cylinder gasoline Caterpillar 3400G engine used on the 4J and 6J versions. Transmission options include 3-speed and 5-speed gearboxes, with the 3-speed used on the 5E and the 5-speed on the 4J and 6J. The tractor has a tested drawbar power of 27.15 hp and belt power of 32.47 hp. It weighs 6350 lbs and runs on 13-inch wide tracks with gauges of 40 or 50 inches. The fuel tank capacity is 20 gallons.

Power36 hp[B]

Founded1934 - 1942

ModelR2

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Technical Specifications

Detailed specifications and technical data for Caterpillar R2

Power

Belt (tested)	32.47 hp (24.2 kW)
Drawbar (tested)	27.15 hp (20.2 kW)

Engine

Fuel tank	20 gal (75.7 L)
Rated RPM 5E	950
Air cleaner 5E	oil bath
Bore/Stroke 5E	4.00x5.00 inches (102 x 127 mm)
Engine options	Caterpillar 4.1L 4-cyl gasoline, Caterpillar 3.6L 4-cyl gasoline
Displacement 5E	251 ci (4.1 L)
Engine detail 5E	Caterpillar gasoline 4-cylinder liquid-cooled, Original engine, used on the 5E version.
Rated RPM 4J and 6J	1525
Air cleaner 4J and 6J	oil bath
Bore/Stroke 4J and 6J	3.75x5.00 inches (95 x 127 mm)
Displacement 4J and 6J	221 ci (3.6 L)
Oil capacity 4J and 6J	12 qts (11.4 L)
Engine detail 4J and 6J	Caterpillar 3400G gasoline 4-cylinder liquid-cooled, The 3400G was used on the 4J and 6J versions, which were most R-2 tractors built.
Coolant capacity 4J and 6J	28 qts (26.5 L)

Dimensions

Weight	6350 lbs (2880 kg)
Gauge 1	40 inches (101 cm)
Gauge 2	50 inches (127 cm)
Track width	13 inches (33 cm)

Mechanical

Drive	crawler
Operator station	Open operator station.

Production

Type	Agricultural Crawler tractor
4J built	1185
5E built	83
6J built	1150
Built in	Peoria, Illinois, USA
Total built	2418 (total)
Years produced	1934 - 1942

References

Reference	R2 Tractor published in 1938, by Caterpillar

Belt Pulley

RPM	950
Width	6.5 inches (16 cm)
Diameter	10.5 inches (26 cm)

Transmission

3-speed gear	Type: gear, Gears: 3 forward and 1 reverse, The three-speed was used on the 5E version, built in limited quantities until 1938.
5-speed gear	Type: gear, Gears: 5 forward and 1 reverse, Oil capacity: 8 qts (7.6 L), The five speed transmission was used on the R-2 4J and R-2 6J.
Transmission options	3-speed gear, 5-speed gear

Serial Number Location