 When the hopper is lowered, the front edge cuts into the soil or clay like a plane and fills the hopper.When the hopper is full ( heaped, depending on type) it is raised, and closed with a vertical blade (known as the apron).The scraper can transport its load to the fill area where the blade is raised, the back panel of the hopper, or the ejector, is hydraulically pushed forward and the load tumbles out.