The maximum load is the need of a customer and must be clearly specified . A design of almost all the crane components is influenced by this parameter. In some cases, it is necessary to arrange for a second hoisting machinery called the auxiliary hoist, to take a lighter load. If the load at which the crane is operated in general is less than the maximum load, an auxiliary hoist may be used. Cranes needed for power plant maintenance is an example of such cases where auxiliary hoist might be fitted. For a different reason, auxiliary hoist may be fitted with cranes needed for foundries, steel casting shop handling ladles containing molten metal. In these industries, the main hoist of the crane is used for hoisting the ladle that has the molten metal, while the auxiliary hoist is used to lift the ladle slowly to pour the liquid into the mold.