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The heavier scraper types have two engines ("tandem powered"), one driving the front wheels, one driving the rear wheels, with engines up to 400 kW (536 hp). Multiple scrapers can work together in a push-pull fashion but this requires a long cut area. Smaller scrapers may be towed by a bulldozer.
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.
The D575A-2 SD Super Dozer was the second version of the D575A, going into production alongside the D575A-2 SR Super Ripper beginning in 1995. [3] The D575A-2 SD Super Dozer is an 1,150 horsepower (860 kW), 143,300 kilograms (315,900 lb) dedicated dozer with no ripper. The D575A-2 SD Super Dozer was superseded by the D575A-3 SD Super Dozer.
The Komatsu D475A is the second largest bulldozer in the Komatsu line after the D575A, the world's largest production bulldozer. [1] The current version is the 248,240 pounds (112,600 kg), 899 horsepower (670 kW) D475A-8 Tier 4. [2]
A heavy equipment operator drives and operates heavy equipment used in engineering and construction projects. [7] [8] Typically only skilled workers may operate heavy equipment, and there is specialized training for learning to use heavy equipment. Much publication about heavy equipment operators focuses on improving safety for such workers.
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1955: 1H Series D8 ends production; 191 hp (142 kW) D8E and D8D introduced with new 1,246-cubic-inch (20,420 cc) displacement (CID) D342 diesel engine. D8D had a torque converter and D8E had a direct drive transmission. 1956: D8D replaced by D8G. 1956: D8E replaced by D8F. 1958: 235 hp (175 kW) D8H introduced.
On its blog, Craigslist dismisses Blumenthal's move as a publicity stunt, and emphasizes that "craigslist has gone beyond fulfilling its legal obligations, far beyond classifieds industry norms ...