A crane trolley is a component of a crane system that is used to move the hoist and load horizontally along the length of the crane beam. It is a wheeled device that runs on rails mounted on the beam of the crane. The trolley is attached to the hoist and can be moved manually or automatically along the beam, allowing the hoist and load to be positioned precisely. Crane trolleys come in different types, including manual and powered trolleys. Manual trolleys are operated by hand and are suitable for light loads, while powered trolleys are driven by an electric motor and can handle heavier loads. Proper selection and use of crane trolleys are crucial to ensure safe and efficient lifting operations. By understanding the different types of crane trolleys and their functions, crane operators can select the appropriate trolley for their lifting needs and ensure safe lifting operations.