The Caterpillar D7 is a medium bulldozer manufactured by Caterpillar Inc. The first D7 appeared in 1938. The D7C came next in 1955. The D7H d8t caterpillar pdf the first D7 to come with the exclusive elevated drive sprocket undercarriage.
In March 2008, at Conexpo 2008 held every 3 years in Las Vegas, Caterpillar introduced the D7E. This 235 hp D7E comes with an electric drive system powered by a 537cid C9. 3 powers a generator that turns out electricity that supplies power to a pair of AC drive motors. An agricultural version without the blade and rippers is commonly used by farmers. Specially modified D7E’s fitted with Rome plows were used to clear forest in the Vietnam war. The US Army used armored D7G to clear mine fields and unarmored D7G and D7H for earthworks.
The Egyptian Army operates an unknown number of armored D7R II. Angle: A type of blade, typically only 4′ in height, that attaches to the dozers C-frame. The C-frame has 3 holes on each side where the blade will be manually pinned into, thus the angle blade has 3 set positions: right angle, left angle, and centered. Most commonly found in pipeline construction, due to the fact that an experienced operator can move and grade large quantities of material in a relatively short amount of time. S-U” combination blade which is shorter, has less curvature, and smaller side wings.