Parts of a Tower Crane
All tower cranes consist of the same basic parts:- The base is bolted to a large concrete pad that supports the crane.
- The base connects to the mast (or tower), which gives the tower crane its height.
- Attached to the top of the mast is the slewing unit -- the gear and motor -- that allows the crane to rotate:
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On top of the slewing unit are three parts:
- The long horizontal jib (or working arm), which is the portion of the crane that carries the load. A trolley runs along the jib to move the load in and out from the crane's center:
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- The shorter horizontal machinery arm, which contains the crane's motors and electronics as well as the large concrete counter weights:
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- The operator's cab:
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The machinery arm contains the motor that lifts the load, along with the control electronics that drive it and the cable drum, as shown here:
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The motors that drive the slewing unit are located above the unit's large gear:
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