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Cranes play an important role in modern society. Hydraulic cranes give power and mobility that is unparalleled.

Hydraulics Explained

Hydraulics uses force applied at one location to transfer force to another area using an incompressible liquid like oil. Hydraulic systems are almost always used to increase force, so the amount of force applied to the final location is greater than the force needed to be generated begin the system. A frequent hydraulic use is in a car?s brake system. When you lower the brake pedal, a pump moves fluid through the line, which squeezes the brake pads against the wheels of the car. Hydraulics are also often used in lifting.

Hydraulic Crane Trucks

Crane trucks take advantage of the principle of hydraulics to lift and move a many heavy loads. The trucks differvary in size and specialty. Some trucks are designed the heaviest lifting, others for jobs that need a great deal of height, and some even have all-terrain capabilities. The trucks are named according to the amount of weight they are able to lift, for example, a 20 ton crane is able to lift 20 tons.

Boom

A boom is an extending arm that grows for a longer reach, or to move the pulley. A boom is generally divided into sections and a hydraulic pump will fill each section with fluid, causing the boom arm to become firm. Fire ladder trucks, crane trucks, and some utility trucks have a boom arm. Some boom arms are large enough to need a jib, a latticework structure that maintains support and length to the boom arm.

Rotex Gear

While the boom arm is responsible for raising and lowering the crane, the rotex gear, generally located underneath the cab, moves the crane from side to side. The rotex gear seems like a giant clock gear, and works in much the same way to operate the crane from side to side efficiently.

Outriggers

Tires alone can?t possibly provide the support necessary to stabilize the crane truck. Without more support, the trucks would tip or just be unable to work. Outriggers give the crane truck more/additional strength by extending several feet in each direction from the truck. Hydraulics are used in the outrigger system as well, the whole truck is raised and all weight is shifted to the legs of the outriggers. Counterweights are also used to also balance the truck during the lift.

Now when you see a crane operating in the future, you will have a better appreciation of the technology that make a crane work and how important they are to our cities and lifestyle.

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