Other KInds of Crawler-Mounted Cranes
In order to be able to power a huge range of machines, industrial wheel tractors were modified in the 1920s, by Fordson and McCormick-Deering. For example, half-swing cranes and shovels were manufactured by several companies around the power train and engine of the tractor and the wheels became replaced by crawlers.
Throughout the 1930s, crawler tractors came into widespread use. Soon after, numerous manufacturers started making attachments for them, including a range of lifting machine devices.
For example, side-mounted booms were mainly used for pipe-laying where it gained its nickname the "pipelayer." These types of equipments are usually used now for attending to cleaning up railroad derailments. Because of their mobility, size and compact design, along with outstanding lifting capacity, these types of equipments are great for this application. In addition, 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 can not move fast thanks to their intense weights. Typically, the crane can 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 that is easy to extend by utilizing hydraulics. The lattice boom must be assembled by hand by adding many sections.
Tower Cranes
Normally found in large construction projects, tower cranes are required to be erected and broken down on location. They should be transported by truck every time they are relocated. These tower cranes are very tall. They enable construction crews to transport heavy steel or concrete building components to the tops of tall buildings. Tower cranes use a hydraulic system to be able to push each and every new crane part up into position and thus, are self-erecting.