A mist cannon truck is a type of vehicle equipped with a mist cannon, which is used for wide spray and air cleaning purposes. The slewing bearing plays a crucial role in the operation of the mist cannon truck. It allows the mist cannon to carry and rotate the fixed air ventilator, enabling the wide spray and air cleaning effect [1].

The mist cannon truck typically uses a single row four-point contact ball slewing bearing or slewing drive for this purpose [1]. The slewing bearing or slewing drive is a rotational rolling-element bearing that supports the heavy load of the mist cannon and enables its rotation. It ensures smooth and controlled movement of the mist cannon, allowing it to cover a wide area with the mist spray.

The mist cannon truck slewing bearing can be of different types, such as non-geared (no teeth), external geared (outer teeth), or internal geared (inner teeth) [2]. The specific type of slewing bearing used in a mist cannon truck may depend on the design and requirements of the vehicle.