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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 ...
John Deere 850J R Medium Crawler Tractor (MCT) US Marines; Caterpillar D7R US Navy/Army Use; Caterpillar D9; Loader US Navy Caterpillar 924H Wheel Loader. Case/Caterpillar Skidsteer Loaders; John Deere 624J/K R TRACTOR, RUBBER TIRED, ARTICULATED STEERING, MULTIPURPOSE (TRAM) US Marines; Caterpillar 924H Wheel Loader; Caterpillar 966H Wheel Loader
Sometimes, a bulldozer is used to push or pull another piece of earth-moving equipment known as a "scraper" to increase productivity. The towed Fresno Scraper , invented in 1883 by James Porteous , was the first design to enable this to be done economically, removing the soil from an area being cut and depositing where needed as fill .
Several types of bulldozer blade can be used on the front of the tractor: Straight ("S-Blade"): A short blade with no lateral curve and no side wings. It can be used for fine grading; Angle: held by a U shape frame that has three holes on each side, to set the blade to 3 positions: right, center, and left.
This was a tractor attachment with four functions: dozer, clamshell, bucket and scraper. The "International Drott" was an International Harvester tractor fitted with Drott equipment. [4] In 1950, International signed an agreement with Drott to produce the machines under the name "International-Drott." [3]
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 The D575A-2 SD Super Dozer was superseded by the D575A-3 SD Super Dozer.
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All used the Cat 3306T 6-cylinder engine. The D6M XL and D6M LGP versions with 140 hp (100 kW) weighed 33,200 and 36,400 pounds (15,100 and 16,500 kg). Respectively, closer to the older D6C and D6D. Both used the Cat 3116T engine.