Abstract: An overhead service unit provided with a base having a fixed frame projecting upwardly therefrom. A series of movable frames are slidably interconnected to each other and to said fixed frame with a platform movably supported on one of said movable frames. A pair of cylinders are mounted on said base and are provided with a pair of rams which are movable in opposite directions to cause a plurality of chains operatively connected to said rams, the fixed and movable frames and platform to raise and lower said movable frames and platform for moving said platform to and from elevated work positions.