Various KInds of Crawler-Mounted Cranes
In order to be able to power a huge variety of machines, industrial wheel tractors were adapted during the 1920s, by Fordson and McCormick-Deering. For instance, half-swing shovels and cranes were manufactured by several companies around the power train and engine of the tractor and the wheels became replaced by crawlers.
During the 1930s, crawler tractors came into widespread use. Immediately after, many manufacturers started making attachments for them, such as a variety of lifting equipment devices.
For example, side-mounted booms were primarily utilized for pipe-laying where it gained its nickname the "pipelayer." These kinds of machinery are presently normally utilized for attending to cleaning up railroad derailments. Due to their mobility, size and compact design, along with outstanding lifting capacity, these equipments are ideal for this application. As well, 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 machines could not move fast due to their intense weights. Normally, the crane could be controlled by 2 or more cable operated drums and is powered by one engine. The crawler cranes are available with a telescopic arm or a lattice boom which could be extended easily using hydraulics. The lattice boom must be assembled by hand by adding multiple sections.
Tower Cranes
Tower cranes are those found in big construction projects. These types of cranes are necessary to be erected and broken down on location. They must be transported by truck each and every 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 place and hence, are self-erecting.