Hydraulic cranes are designed to be very simple, yet they can perform seemingly impossible and daunting tasks. In minutes, these machines can lift tons of bridges on highways, heavy equipment in factories, and even coastal houses to piles.
When watching a hydraulic truck crane in action, it’s hard to believe how much weight it moves, since it can handle these tons of objects with relative ease. Hydraulic truck cranes have different lifting capacities. It’s easy to judge how much a particular hydraulic truck crane can lift just by its name: a 40-ton crane can lift 40 tons (80,000 pounds or 36,287 kilograms).
Truck mounted crane
Cranes mounted on truck transport vehicles provide mobility for this type of crane. Generally, these cranes are designed to travel on streets and highways without special circumstances.
A 30-ton hydraulic crane is used to lift the truss.
A 30-ton hydraulic crane lifts the house truss.
Equipment for transporting cranes to construction sites. When working on-site, the legs extend horizontally from the chassis and then descend vertically to stabilize the crane horizontally during stationary and lifting. Many truck cranes have limited slow travel capability (just a few miles per hour) when hanging a load. Be very careful not to swing the load sideways from the driving direction, as most anti-tilting stability depends on the strength and stiffness of the chassis suspension. Most cranes of this type also have moving weights for stabilization outside the legs. Loads suspended directly at the rear remain more stable because most of the weight of the truck crane itself is then loaded as the load. Crane operators use factory-calculated charts (or electronic safety devices) to determine the maximum safe load, (rubber) load, and travel speed for stationary (jib) work. The lifting capacity of truck cranes varies from about 14.5 tons to about 1300 tons.
Rough terrain crane.
Cranes mounted on hangers with large rubber tires are specially designed for pick and handle operations, off-road and rough terrain applications. These telescopic cranes are single-engine machines, and the same engine used to power the hanger is used to power the hanger, similar to crawler cranes. However, in rough terrain cranes, the engine is usually mounted on the pylon rather than on the upper part as in crawler cranes.