Various KInds of Crawler-Mounted Cranes
Industrial wheel tractors during the 1920s, such as those made by Fordson and McCormick-Deering were rapidly modified in order to be able to power a large range of machines. Like for instance, half-swing cranes and shovels were manufactured by some companies around the power train and engine of the tractor and the wheels became replaced by crawlers.
In the 1930s, crawler tractors came into widespread use. Soon after, many manufacturers started manufacturing attachments for them, like for instance various lifting equipment devices.
Side-mounted booms for example, were utilized primarily for pipe-laying at first and the machinery got the nickname "pipelayer." These machines are currently often utilized for attending to cleaning up railroad derailments. Because of their size, compact design and mobility, as well as excellent lifting capacity, these equipments are ideal for this application. In addition, swing booms which mounted on top of the engine compartment became available too.
Crawler cranes are like the crawler tractor in that it travels along crawler tracks. These equipments could not move fast thanks to their intense weights. Typically, the crane could be controlled by 2 or more cable operated drums and is powered by one engine. The crawler cranes are available with a telescopic arm or a lattice boom which could be extended easily using hydraulics. The lattice boom should be assembled manually by adding many sections.
Tower Cranes
Normally found in big construction projects, tower cranes are required to be erected and broken down on location. They should be transported by truck every time they are relocated. These tower cranes are very tall. They allow construction crews to move concrete building components or heavy steel to the tops of tall buildings. Tower cranes use a hydraulic system in order to push each and every new crane section up into position and therefore, are self-erecting.