Various KInds of Crawler-Mounted Cranes
Industrial wheel tractors in the 1920s, such as those manufactured by McCormick-Deering and Fordson were rapidly modified in order to be able to power a huge variety of equipment. For instance, half-swing shovels and cranes were made by several companies around the tractor's engine and power train and the wheels became replaced by crawlers.
In the 1930s, crawler tractors came into widespread use. Immediately after, many manufacturers began manufacturing attachments for them, like for instance various lifting machine devices.
For instance, side-mounted booms were mainly utilized for pipe-laying where it gained its nickname the "pipelayer." These types of machines are frequently utilized these days for attending to cleaning up railroad derailments. Because of their compact design, mobility and size, along with outstanding lifting capacity, these types of machinery are ideal for this application. What's more, swing booms that mounted on top of the engine compartment became available too.
Crawler cranes are similar to the crawler tractor in that it travels along crawler tracks. These equipments could not move fast thanks 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 are available with a telescopic arm or a lattice boom which is easy to extend by using hydraulics. The lattice boom must be assembled manually by adding many sections.
Tower Cranes
Normally found in large construction projects, tower cranes are required to be erected and broken down on location. They should be transported by truck every time they are relocated. These tower cranes are exceptionally tall. They allow construction crews to move heavy steel or concrete building parts to the tops of tall buildings. Tower cranes utilize a hydraulic system in order to push every new crane part up into position and hence, are self-erecting.