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Caterpillar first introduced the RD4 in 1936, [1] as the diesel follow on to the successful CAT 30 gas model. The RD4 originally weighed in at 10,000 pounds (4,500 kg), and used Caterpillar's D4400 engine, an inline four-cylinders, with a 4.25 by 5.50 inches (108 mm × 140 mm) bore and stroke. [ 2 ]
For example, the D5H came out years before the D5C. Caterpillar has now turned to a straight number designation (no letters) for all of its new track-laying tractors — starting, for the first time, with the D-1 and going all the way up to the D-11, with consistent size and weight breaks between each model.
The Caterpillar D11 can be distinguished from the Komatsu D475 by the elevated drive sprocket, or "High Drive" system, which results in a triangular, rather than oval, shaped track. The updated version of the Komatsu, the D575A , is the world's largest production bulldozer at 168 short tons (152 t) and 1,150 hp (860 kW). [ 5 ]
The Caterpillar D8 is a medium track-type tractor designed and manufactured by Caterpillar. Though it comes in many configurations, it is usually sold as a bulldozer equipped with a detachable large blade and a rear ripper attachment.
A Caterpillar D6T in St. Louis The Caterpillar D6 track-type tractor is a medium bulldozer manufactured by Caterpillar Inc. with a nominal operating weight of 18 short tons (16 t). The military versions were classified as the SNL G152 medium tractor, under the G-numbers classification system used for army tractors.
The Caterpillar D7 is a medium track-type tractor manufactured by Caterpillar Inc. and most commonly used as a bulldozer. The D7 was first manufactured in 1938. A series of improved models were later produced, including the D7C in 1955, the D7D in 1959, the 160 hp (120 kW) D7E in 1961, the 180 hp (130 kW) D7F in 1969 and the 200 hp (150 kW) D7G ...
A Caterpillar D9N on a beach CAT D9T, the current generation of the Caterpillar D9 tracked-type tractor series. The Caterpillar D9 is a large track-type tractor designed and manufactured by Caterpillar Inc. It is usually sold as a bulldozer equipped with a detachable large blade and a rear ripper attachment.
A bulldozer or dozer (also called a crawler) is a large, motorized machine equipped with a metal blade to the front for pushing material: soil, sand, snow, rubble, or rock during construction work. It travels most commonly on continuous tracks , though specialized models riding on large off-road tires are also produced.