Various KInds of Crawler-Mounted Cranes
In order to be able to power a huge range of machines, industrial wheel tractors were adapted during the 1920s, by McCormick-Deering and Fordson. For example, half-swing cranes and shovels were made by some companies around the tractor's engine and power train and the wheels became replaced by crawlers.
Crawler tractors came into widespread use throughout the 1930s. Immediately after, numerous manufacturers started making attachments for them, like various lifting machine devices.
Side-mounted booms for instance, were utilized mainly for pipe-laying at first and the machinery got the nickname "pipelayer." These kinds of equipments are currently often utilized for attending to cleaning up railroad derailments. Because of their mobility, size and compact design, in addition to outstanding lifting capacity, these machinery are great for this use. In addition, swing booms which mounted on top of the engine compartment became available too.
Similar to a crawler tractor, crawler cranes travel on crawler tracks. Because of their intense weight, these equipments do not move very fast. Usually, the crane is powered by one engine and can be controlled by 2 or more cable operated drums. The crawler cranes come outfitted with a telescopic arm or a lattice boom that could be extended easily utilizing hydraulics. The lattice boom must be manually assembled by adding multiple sections.
Tower Cranes
Tower cranes are those found in big construction projects. These kinds of cranes are essential to be erected and broken down on location. They need to be transported by truck every time they are relocated. These tower cranes are very tall. They enable construction crews to move heavy steel or concrete building components to the tops of tall buildings. Tower cranes use a hydraulic system in order to push each and every new crane part up into place and thus, are self-erecting.