Various KInds of Crawler-Mounted Cranes
In order to be able to power a large variety of equipment, industrial wheel tractors were modified during the 1920s, by Fordson and McCormick-Deering. For instance, half-swing cranes and shovels were made 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. Soon after, numerous manufacturers started manufacturing attachments for them, including various lifting equipment devices.
For instance, side-mounted booms were primarily utilized for pipe-laying where it gained its nickname the "pipelayer." These kinds of machinery are now usually used for attending to cleaning up railroad derailments. Because of their compact design, mobility and size, in addition to outstanding lifting capacity, these types of equipments are ideal for this use. Furthermore, swing booms which mounted on top of the engine compartment also became available.
LIke a crawler tractor, crawler cranes travel on crawler tracks. Because of their intense weight, these equipments do not move very fast. Normally, 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 which could be extended easily utilizing hydraulics. The lattice boom has to be manually assembled by adding multiple sections.
Tower Cranes
Normally found in big construction projects, tower cranes are required to be built and broken down on location. They must be transported by truck each and every time they are relocated. These tower cranes are very tall. They allow construction crews to move heavy steel or concrete building components to the tops of tall buildings. Tower cranes utilize a hydraulic system to push each and every new crane part up into place and therefore, are self-erecting.