How Tower Cranes Work
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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:
On top of the
slewing unit are three parts:
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:
The motors that drive the slewing unit are located above the unit's large
gear:

Now let's find out how much weight this equipment can handle.