Various KInds of Crawler-Mounted Cranes
Industrial wheel tractors in the 1920s, like those built by Fordson and McCormick-Deering were rapidly adapted in order to be able to power a large range of machines. For example, half-swing cranes and shovels were manufactured by several companies around the engine and power train of the tractor and the wheels became replaced by crawlers.
Throughout the 1930s, crawler tractors came into widespread use. Immediately after, numerous manufacturers started making attachments for them, including various lifting machine devices.
For example, side-mounted booms were primarily used for pipe-laying where it gained its nickname the "pipelayer." These kinds of machinery are often utilized today for attending to cleaning up railroad derailments. Because of their mobility, size and compact design, in addition to excellent lifting capacity, these machinery are great for this application. In addition, swing booms that mounted on top of the engine compartment also became available.
Similar to a crawler tractor, crawler cranes travel on crawler tracks. Because of their intense weight, these machinery do not move really fast. Normally, the crane could be controlled by 2 or more cable operated drums and is powered by one engine. The crawler cranes come equipped with a telescopic arm or a lattice boom which is easy to extend by utilizing hydraulics. The lattice boom should be manually assembled by adding many 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 each time they are relocated. These tower cranes are exceptionally 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 to push each new crane part up into position and hence, are self-erecting.