Other KInds of Crawler-Mounted Cranes
In order to be able to power a huge variety of machines, industrial wheel tractors were modified in the 1920s, by Fordson and McCormick-Deering. For instance, 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, numerous manufacturers began making attachments for them, including various lifting machine devices.
Side-mounted booms for instance, were utilized primarily for pipe-laying at first and the equipment got the nickname "pipelayer." These kinds of machinery are usually used nowadays for attending to cleaning up railroad derailments. Because of their compact design, mobility and size, in addition to excellent lifting capacity, these machines are great for this use. What's more, swing booms that 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 equipments do not move really fast. Usually, the crane could be controlled by 2 or more cable operated drums and is powered by one engine. The crawler cranes come outfitted with a telescopic arm or a lattice boom that can be extended easily utilizing hydraulics. The lattice boom has to be manually assembled by adding many sections.
Tower Cranes
Tower cranes are those found in big construction projects. These kinds of cranes are essential 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 enable construction crews to move heavy steel or concrete building components to the tops of tall buildings. Tower cranes utilize a hydraulic system in order to push every new crane section up into position and hence, are self-erecting.