|
|
|
|
|
|
|||
|
Crawler Dozers |
|
|
|
|
Crawler dozers are large and powerful tracked heavy equipment. The tracks give them excellent ground hold and mobility through very rough terrain. Wide tracks help distribute the crawler dozer's weight over large area (decreasing pressure), thus preventing it from sinking in sandy or muddy ground. Extra wide tracks are known as 'swamp tracks'. Crawler dozers have excellent ground hold and a torque divider designed to convert the engine's power into improved dragging ability. The Caterpillar D9, for example, can easily tow tanks that weigh more than 70 tons. Because of these attributes, crawler dozers are used to clear areas of obstacles, shrubbery, burnt vehicles, and remains of structures.
Sometimes a crawler dozer is used to push another piece of earthmoving equipment known as a "scraper". 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 the cut and depositing it elsewhere on shallow ground (fill). Many dozer blades have a reinforced center section with this purpose in mind, and are called "bull blades." The crawler dozer's primary tools are the blade and the ripper. Crawler dozers have been further modified over time to evolve into new machines which can work in ways that the original crawler dozer cannot. One example is that loader tractors were created by removing the blade and substituting a large volume bucket and hydraulic arms which can raise and lower the bucket, thus making it useful for scooping up earth and loading it into trucks, these are often known as a Drott. Other modifications to the original crawler dozer include making it smaller to let it operate in small work areas where movement is limited, such as in mining. A very small crawler dozer is sometimes called a calfdozer. Some lightweight form of crawler dozer are commonly used in snow removal and as a tool for preparing winter sports areas for ski and snowboard sports. Nevertheless, the original earthmoving crawler dozers are still irreplaceable as their tasks are concentrated in deforestation, earthmoving, ground levelling, and road carving. Heavy crawler dozers are mainly employed to level the terrain to prepare it for construction. The construction, however, is mainly done by small crawler dozers and loader tractors. This text was shortened and modified from Wikipedia. |
|
Equipment LinksCaterpillar DozersGrove Equipment JCB Backhoes Komatsu Dozers |
|
|
||||
| Used Backhoes | Used Forklifts | Used Excavators | Site Map |
| by using this site, you agree to our Terms of Service |
| Copyright 2004-2009 Kobatera, LLC |
|