Measures and marks grade lines on support columns. Connects pump and jacks to control panel, and positions panel on slab so that jacks and grade marks may be observed during lifting.
Starts pump and moves levers and valves on control panel to regulate action of jacks.
Signals worker to verify grade with rule. Adjusts control valves when slab has reached predetermined position. Directs welding crew to weld supporting collars or brackets to column. May drive truck, equipped with winch, to raise jacks to position on support columns, and to lift and remove equipment from slab.