How The Telescopic Truck Crane Works

Inside the boom there is a rotating reel, which is wound around the wire. The rope passes through the pulley on the top of the lower arm and pulls the upper boom out. When retracted, Reel retracts the wire rope and the boom retracts under heavy duty. This rotating drum is driven by a hydraulic motor, so you can see two tubing, but do not treat it as a cylinder.

Besides, some truck cranes equipped with a a plunger-type cylinder in the telescopic arm, When the boom is loaded, it will bend flexibly, which has a great impact on the life of the cylinder.
We do not use this model.

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