This design (worm-driven slewing bearing) is a complete unit and is ready for installation. And it is also very easy to integrate this design into equipment that has already been installed.
The assembly consists of a ball bearing or rollers capable of supporting axial, radial and torque loads simultaneously, a hydraulic or electric motor to generate the relative motion between the two rings and a fully enclosed housing which protects the ring from dirt, damage and loss of lubrication.
In addition, these assemblies do not require any parts to be installed and are available in a wide range of several standard sizes. The following illustration shows all of the parts included in the assembly.