Various Types of Crawler-Mounted Cranes
Industrial wheel tractors in the 1920s, such as those built by Fordson and McCormick-Deering were quickly modified in order to be able to power a huge variety of machines. For example, half-swing cranes and shovels were made by some companies around the power train and engine of the tractor and the wheels became replaced by crawlers.
Crawler tractors came into widespread use throughout the 1930s. Immediately after, many manufacturers started making attachments for them, such as various lifting equipment devices.
For example, side-mounted booms were mainly utilized for pipe-laying where it gained its nickname the "pipelayer." These types of machines are usually used now for attending to cleaning up railroad derailments. Due to their mobility, size and compact design, along with excellent lifting capacity, these equipments are great for this use. Additionally, 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 which is easy to extend by utilizing hydraulics. The lattice boom has to be assembled by hand by adding multiple sections.
Normally found in big construction projects, tower cranes are required to be built and broken down on location. They need to be transported by truck each and every time they are relocated. These tower cranes are very tall. They enable construction crews to move concrete building components or heavy steel to the tops of tall buildings. Tower cranes use a hydraulic system to be able to push every new crane part up into position and thus, are self-erecting.