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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 ]
E/D to denote a low-specification, or "value specification", (like the 03 and 05 series in the 6000 and 5000 respectively); A sixth digit describes special configurations (like "T" for Tracks on the 8RT series tractors). Example. For example, the new 3032E tractor will be a 3000 with 32 hp (24 kW) rated engine; the E is low-specification.
The best-known maker of bulldozers is Caterpillar. Komatsu, Liebherr, Case, Hitachi, Volvo, and John Deere are present-day competitors. Although these machines began as modified farm tractors, they became the mainstay for big civil construction projects, and found their way into use by military construction units worldwide.
The long hood and large grill area allowed the largest highway engines to be used. Caterpillar, Cummins, and Detroit Diesel engines were available with up to 480 horsepower (360 kW). Fuller manual transmissions with 5 to 15-speeds were available. Single and tandem, rear axles were available.
Caterpillar D2 with cutter and cart Caterpillar D2 compact crawler tractor (built from 1938–1957) at the Belvoir Castle Steam Festival 2007, Belvoir Castle, England. The Caterpillar D2 is an agricultural tractor manufactured by Caterpillar. It was introduced in 1938 [3] and was the smallest diesel powered track-type tractor manufactured by ...
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 ...
The first tracked loaders were built from tracked tractors with custom-built loader buckets. The first loaders were cable-operated like the bulldozers of the era. These tracked loaders lacked the ability to dig in hard ground, but so did the bulldozers of the day. They were mostly used for moving stockpiled material and loading trucks and rail ...
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