Various KInds of Crawler-Mounted Cranes
In order to be able to power a large range of machinery, industrial wheel tractors were modified during the 1920s, by McCormick-Deering and Fordson. For instance, half-swing shovels and cranes were made by some companies around the power train and engine of the tractor and the wheels became replaced by crawlers.
Throughout the 1930s, crawler tractors came into widespread use. Soon after, many manufacturers started making attachments for them, like various lifting equipment devices.
Side-mounted booms for instance, were utilized mainly for pipe-laying at first and the machinery got the nickname "pipelayer." These machines are usually used today for attending to cleaning up railroad derailments. Due to their size, compact design and mobility, along with outstanding lifting capacity, these machinery are great for this application. What's more, swing booms which mounted on top of the engine compartment became available also.
Similar to a crawler tractor, crawler cranes travel on crawler tracks. Because of their intense weight, these equipments do not move really fast. Usually, the crane is powered by one engine and could be controlled by 2 or more cable operated drums. The crawler cranes are available with a telescopic arm or a lattice boom that is easy to extend by using hydraulics. The lattice boom must be manually assembled by adding multiple sections.
Tower Cranes
Usually found in big construction projects, tower cranes are required to be built and broken down on location. They should be transported by truck every time they are relocated. These tower cranes are exceptionally tall. They allow construction crews to move heavy steel or concrete building components to the tops of tall buildings. Tower cranes use a hydraulic system to push each new crane part up into place and hence, are self-erecting.