Various KInds of Crawler-Mounted Cranes
In order to be able to power a large range of equipment, industrial wheel tractors were modified during the 1920s, by Fordson and McCormick-Deering. Like for example, half-swing shovels and cranes were manufactured by several companies around the tractor's power train and engine and the wheels became replaced by crawlers.
Throughout the 1930s, crawler tractors came into widespread use. Immediately after, many manufacturers started manufacturing attachments for them, including a range of lifting machine devices.
For example, side-mounted booms were mainly utilized for pipe-laying where it gained its nickname the "pipelayer." These types of machines are frequently used nowadays for attending to cleaning up railroad derailments. Because of their compact design, mobility and size, as well as exceptional lifting capacity, these types of machinery are ideal for this application. Furthermore, swing booms that mounted on top of the engine compartment became available also.
Crawler cranes are similar to the crawler tractor in that it travels along crawler tracks. These machinery can not move fast due to their intense weights. Usually, the crane could be controlled by 2 or more cable operated drums and is powered by one engine. The crawler cranes come equipped with a lattice boom or a telescopic arm which could be extended easily utilizing hydraulics. The lattice boom needs to be manually assembled by adding many sections.
Tower Cranes
Normally found in big construction projects, tower cranes are required to be erected and broken down on location. They should be transported by truck each time they are relocated. These tower cranes are very 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 section up into place and thus, are self-erecting.