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

Hydraulics Explained

Hydraulics uses force applied at a particular location to move force to another point using an incompressible liquid like oil. Hydraulic systems are almost always used to increase force, so the amount of force applied to the end location is greater than the force needed to be generated start the operation. A common hydraulic example is in a car?s brake system. When you press the brake pedal, a pump transfers fluid through the line, which squeezes the brake pads against the wheels of the car. Hydraulics are also commonly applied in lifting.

Hydraulic Crane Trucks

Crane trucks use the idea of hydraulics to lift and move a number of heavy loads. The trucks differvary in size and specialty. Some trucks are designed the heaviest lifting, others for applications requiring a great deal of height, and some even have all-terrain capabilities. The trucks are named according to the loads 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 extends for a longer reach, or to raise the pulley. A boom is usually separated into sections and a hydraulic pump will fill each section with fluid, causing the boom arm to become rigid. Fire ladder trucks, crane trucks, and some utility trucks use a boom arm. Some boom arms are large enough to require a jib, a latticework structure that adds support and length to the boom arm.

Rotex Gear

While the boom arm is responsible for raising and lowering the crane, the rotex gear, usually found underneath the cab, moves the crane from side to side. The rotex gear seems like a giant clock gear, and works in largely the same way to move the crane from side to side with ease.

Outriggers

Tires alone couldn’t offer the support needed to stabilize the crane truck. Without additional support, the trucks would tip or at least 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 in addition, the entire truck is lifted and all weight is transferred to the legs of the outriggers. Counterweights are also used to also balance the truck during the operation.

Now when you see a crane working on a project, 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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