Various KInds of Crawler-Mounted Cranes
In order to be able to power a huge range of machinery, industrial wheel tractors were modified during the 1920s, by McCormick-Deering and Fordson. Like for example, half-swing cranes and shovels were made by several companies around the tractor's engine and power train and the wheels became replaced by crawlers.
During the 1930s, crawler tractors came into widespread use. Soon after, numerous manufacturers started manufacturing attachments for them, like for instance various lifting equipment devices.
Side-mounted booms for example, were used primarily for pipe-laying at first and the machine got the nickname "pipelayer." These equipments are usually used nowadays for attending to cleaning up railroad derailments. Because of their compact design, mobility and size, along with outstanding lifting capacity, these equipments are ideal for this use. Additionally, 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 machinery do not move very fast. Usually, the crane is powered by one engine and may 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 using hydraulics. The lattice boom should be manually assembled by adding many sections.
Tower Cranes
Typically found in large construction projects, tower cranes are required to be built and broken down on location. They need to be transported by truck each time they are relocated. These tower cranes are exceptionally 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 every new crane section up into place and thus, are self-erecting.