Various KInds of Crawler-Mounted Cranes
In order to be able to power a large range of machines, industrial wheel tractors were modified in the 1920s, by Fordson and McCormick-Deering. For example, half-swing shovels and cranes were made by several companies around the power train and engine of the tractor and the wheels became replaced by crawlers.
Crawler tractors came into widespread use throughout the 1930s. Soon after, many manufacturers began making attachments for them, including various lifting equipment devices.
For example, side-mounted booms were primarily used for pipe-laying where it gained its nickname the "pipelayer." These kinds of equipments are frequently utilized nowadays for attending to cleaning up railroad derailments. Because of their mobility, size and compact design, along with exceptional lifting capacity, these equipments are great for this use. What's more, swing booms that mounted on top of the engine compartment also became available.
Crawler cranes are similar to the crawler tractor in that it travels along crawler tracks. These machinery could not move fast thanks to their intense weights. Typically, the crane may be controlled by 2 or more cable operated drums and is powered by one engine. The crawler cranes are available with a lattice boom or a telescopic arm that is easy to extend by using hydraulics. The lattice boom needs to be manually assembled by adding many sections.
Tower Cranes
Tower cranes are those found in big construction projects. These kinds of cranes are necessary to be erected and broken down on location. They need to be transported by truck each time they are relocated. These tower cranes are exceptionally tall. They allow construction crews to transport heavy steel or concrete building parts to the tops of tall buildings. Tower cranes use a hydraulic system in order to push each and every new crane section up into place and hence, are self-erecting.