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Below the lifting arm has a rotating drum, above around the wire rope, wire rope through the pulley arm on the top of the next section will boom out in the previous section, and so on. Pulled back, back the reel recovery rope, boom weight the next time ... The rotating drum driven by hydraulic motor, so they can see two pieces of tubing, but never as a fuel tank. In addition there are some inside the telescopic boom of truck crane suit type of plunger-type cylinder is installed, but this application is very rare. Multi-stage piston cylinder costs are high, and lifting arm bending occurs when under load, had a great influence on the cylinder life.