For standard workshop duty crane the hoisting unit is comprised of compact wire rope hoist unit. While in case of heavy duty or higher capacity cranes, the hoisting unit is made from fabricated and machined rope drum housing left hand and right hand grooves to achieve true vertical lift. The rope drum is connected to total enclosed helical gearbox through flexible drum coupling. The gearbox is driven by electric motor either sq. cage induction type or slip ring type. Fail safe hydraulically operated thrustor brake or DC brake is provided on input shaft of gearbox to prevent accidental lowering of load in the event of power failure.