Caterpillar

Caterpillar RD4

The Caterpillar RD4 is an agricultural crawler tractor produced from 1935 to 1940 by Caterpillar in Peoria, Illinois, USA. It features a Caterpillar 5.1L 4-cylinder liquid-cooled diesel engine rated at 44.2 hp estimated engine power, with a 5-speed gear transmission and crawler drive. The tractor has an open operator station and was tested to deliver 35.06 hp at the drawbar and 39.82 hp at the belt. It has track gauges of 44 inches and 60 inches. The RD4 is related to the Caterpillar D4 model produced from 1938 to 1947.

Power44 hp[B]

Founded1935 - 1940

ModelRD4

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Technical Specifications

Detailed specifications and technical data for Caterpillar RD4

Power

Belt (tested)	39.82 hp (29.7 kW)
Drawbar (tested)	35.06 hp (26.1 kW)
Estimated engine power	44.2 hp

Engine

Model	Caterpillar 5.1L 4-cyl diesel
Cooling	liquid-cooled
Cylinders	4-cylinder
Fuel type	diesel
Rated RPM	1400
Bore/Stroke	4.25 x 5.50 inches (108 x 140 mm)
Displacement	312.1 ci (5.1 L)
Manufacturer	Caterpillar