These twin mechanical jack screw lift platforms are powered by a single motor. Four Post Lift. This 60 ton 4-post lift is used for set up of turbine shafts. One movable lift is powered by air bearings to allow easy movement during set-up. Six Post, Pit-Mounted Lift. 40 ton 6-post vertical lift is pit-mounted. A single 50 hp motor drives all of the screws.