A crane trolley hoist is a combination of two components in a crane system - the crane trolley and the hoist. It is a device that allows for the horizontal and vertical movement of loads. The crane trolley hoist is mounted on the crane beam and consists of a trolley that moves horizontally along the beam and a hoist that is used to lift and lower loads vertically. The trolley hoist allows for the precise positioning of loads along the crane beam, making it ideal for use in a variety of lifting applications. The hoist and trolley can be powered by different types of motors, including electric, hydraulic, and pneumatic. Proper selection and use of a crane trolley hoist is crucial to ensure safe and efficient lifting operations. By understanding the functions and limitations of different types of crane trolley hoists, crane operators can select the appropriate hoist for their lifting needs and ensure safe lifting operations.