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In the human body, the great pumps the blood, the lung keeps the blood clean, and the arms and legs move accoring to the commands of the brain. To look at this as a hydraulic system,

*The heart is the pump ... it pumps the hydraulic oil.
*The lungs are filters ... they maintain the purity of the hydraulic oil.
*The arms and legs are actuators such as cylinders and mortors ... they respond faithfully to the manipulation of the control valve.

Aside from these, just as the human body is composed of organs and tissues too numerous to count, hydraulic systems are also composed of a large number of parts, each with different functions.

In order to perform various movements such as raising and lowering the boom, winding in the wire rope, swinging and extending or retracting the boom, a hydraulic crane uses a hydraulic circuit that is made up of the following devices: a hydraulic pump to generete force for motion, hydraulic cylinders and mortors as drive devices, and various valves as control devices.

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