Various KInds of Crawler-Mounted Cranes
In order to be able to power a large variety of machines, industrial wheel tractors were adapted in the 1920s, by McCormick-Deering and Fordson. For example, half-swing cranes and shovels were manufactured by some companies around the tractor's engine and power train and the wheels became replaced by crawlers.
Throughout the 1930s, crawler tractors came into widespread use. Soon after, numerous manufacturers started manufacturing attachments for them, like various lifting equipment devices.
For example, side-mounted booms were primarily used for pipe-laying where it gained its nickname the "pipelayer." These kinds of machines are often utilized these days for attending to cleaning up railroad derailments. Because of their size, compact design and mobility, in addition to exceptional lifting capacity, these machinery are great for this application. In addition, swing booms which 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 equipments can not move fast due to their intense weights. Usually, the crane may 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 could be extended easily using hydraulics. The lattice boom must be manually assembled by adding many sections.
Tower Cranes
Tower cranes are the ones found in large construction projects. These types of cranes are essential to be built and broken down on location. They must be transported by truck each time they are relocated. These tower cranes are exceptionally tall. They allow construction crews to transport concrete building components or heavy steel to the tops of tall buildings. Tower cranes use a hydraulic system to push every new crane section up into place and therefore, are self-erecting.