Caterpillar R2

The Caterpillar R2 is a tractor produced by Caterpillar. It is equipped with a 221 ci 3.6 L engine. The rated power output is 29.31 hp 21.9 kW. Transmission: 5 forward and 1 reverse. Drive type: crawler. Operating weight: 6350 lbs 2880 kg.

Overview

	1934 - 1942 Agricultural Crawler tractor
1934 - 1942
Agricultural Crawler tractor

Production
Manufacturer	Caterpillar
Agricultural Crawler tractor
Built in Peoria, Illinois, USA
Total built	2418 (total)
	83 (5E)
	1185 (4J)
	1150 (6J)

Caterpillar R2 Power
Drawbar (tested)	27.15 hp 20.2 kW
Belt (tested)	32.47 hp 24.2 kW
Performance test details ...

Mechanical
Drive	crawler
Open operator station.

Dimensions & Tracks
Weight	6350 lbs 2880 kg
13-inch tracks
Full dimensions and tracks ...

Belt Pulley
Diameter	10.5 inches 26 cm
Width	6.5 inches 16 cm
RPM	950

References
R2 Tractor published in 1938, by Caterpillar

Engine

Engine options
Caterpillar 4.1L 4-cyl gasoline
Caterpillar 3.6L 4-cyl gasoline

Engine Detail — 251 ci / 4.1 L Gasoline

Manufacturer	Caterpillar
Fuel Type	Gasoline
Configuration	4-cylinder, liquid-cooled
Original engine, used on the 5E version.
Displacement	251 ci 4.1 L
Bore/Stroke	4.00x5.00 inches 102 x 127 mm
Air cleaner	oil bath
Rated RPM	950

Engine Detail — 221 ci / 3.6 L Gasoline

Manufacturer	Caterpillar 3400G
Fuel Type	Gasoline
Configuration	4-cylinder, liquid-cooled
The 3400G was used on the 4J and 6J versions, which were most R-2 tractors built.
Displacement	221 ci 3.6 L
Bore/Stroke	3.75x5.00 inches 95 x 127 mm
Air cleaner	oil bath
Rated RPM	1525
Oil capacity	12 qts 11.4 L
Coolant capacity	28 qts 26.5 L

Caterpillar R2 Engine

Transmission

Transmission options
3-speed gear
5-speed gear

Transmission — 3 forward and 1 reverse gear

Type	gear
Gears	3 forward and 1 reverse
The three-speed was used on the 5E version, built in limited quantities until 1938.

Transmission — 5 forward and 1 reverse 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.

Dimensions

Caterpillar R2 Tracks
Width	13 inches 33 cm

Dimensions
Shipping weight	6350 lbs 2880 kg
Gauge	40 inches 101 cm
Gauge	50 inches 127 cm

Tests

Tractor Tests
NTTL 225: 4.1L gasoline 3-speed crawler
NTTL 320: 3.6L gasoline 5-speed crawler

Nebraska Tractor Test 225
4.1L gasoline 3-speed crawler September 24 - October 16, 1934 Link: Nebraska Tractor Test 225 file
Belt power (max)	32.47 hp 24.2 kW
Belt fuel use (max)	3.7 gal/hour 14.0 l/hour
Drawbar performance
Max power	27.15 hp 20.2 kW
Max pull	5274 lbs 2392 kg

Nebraska Tractor Test 320
3.6L gasoline 5-speed crawler 1939 Link: Nebraska Tractor Test 320 file
Belt power (max)	29.31 hp 21.9 kW
Belt fuel use (max)	3.6 gal/hour 13.6 l/hour
Drawbar performance
Max power	23.46 hp 17.5 kW
Gear 2 used for power test.
Max pull	5676 lbs 2574 kg
Gear 1 used for pull test.

Photos

Caterpillar R2

Caterpillar R2

Caterpillar R2