Various KInds of Crawler-Mounted Cranes
In order to be able to power a large variety of machinery, industrial wheel tractors were adapted during the 1920s, by Fordson and McCormick-Deering. For instance, half-swing cranes and shovels were made by some companies around the power train and engine of the tractor and the wheels became replaced by crawlers.
During the 1930s, crawler tractors came into widespread use. Immediately after, many manufacturers began making attachments for them, including 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 often utilized these days for attending to cleaning up railroad derailments. Because of their compact design, mobility and size, along with exceptional lifting capacity, these kinds of equipments are great for this application. What's more, swing booms that mounted on top of the engine compartment became available also.
Crawler cranes are like the crawler tractor in that it travels along crawler tracks. These machinery could not move fast due to their intense weights. Normally, the crane is powered by one engine and could be controlled by 2 or more cable operated drums. The crawler cranes come outfitted with a lattice boom or a telescopic arm which is easy to extend by using hydraulics. The lattice boom must be manually assembled by adding many sections.
Tower Cranes
Usually found in big construction projects, tower cranes are required to be erected and broken down on location. They have to be transported by truck each time they are relocated. These tower cranes are exceptionally tall. They allow construction crews to transport concrete building components or heavy steel to the tops of tall buildings. Tower cranes use a hydraulic system to push each new crane part up into place and thus, are self-erecting.