Various KInds of Crawler-Mounted Cranes
Industrial wheel tractors in the 1920s, such as those built by McCormick-Deering and Fordson were quickly modified in order to be able to power a huge range of machinery. Like for example, half-swing shovels and cranes were manufactured by several companies around the engine and power train of the tractor and the wheels became replaced by crawlers.
Crawler tractors came into widespread use in the 1930s. Soon after, many manufacturers began making attachments for them, including a range of lifting machine devices.
For example, side-mounted booms were primarily used for pipe-laying where it gained its nickname the "pipelayer." These equipments are now normally utilized for attending to cleaning up railroad derailments. Due to their compact design, mobility and size, in addition to outstanding lifting capacity, these kinds of equipments are great for this application. As well, swing booms that mounted on top of the engine compartment also became available.
Similar to a crawler tractor, crawler cranes travel on crawler tracks. Due to their intense weight, these machinery do not move very fast. Normally, 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 which is easy to extend by utilizing hydraulics. The lattice boom should 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 should be transported by truck each and every time they are relocated. These tower cranes are exceptionally tall. They enable construction crews to move concrete building parts or heavy steel to the tops of tall buildings. Tower cranes use a hydraulic system to push every new crane part up into position and therefore, are self-erecting.