Concrete crusher

A gyratory crusher, which includes a bowl, a head assembly and a cylindrical eccentric assembly. The bowl is shaped as a cone and has a wider opening approaching a top portion of the crusher, and an inner shell, which is backed by a concrete outer shell. The head assembly is shaped as a cone, and is centrally located within the bowl. The head assembly also includes a central mainshaft which is located on an inclined axis within the bowl. The cylindrical eccentric assembly includes an eccentric central volume in which the main shaft is held so that, as the eccentric assembly rotates, the mainshaft gyrates, with the eccentric assembly rotating about a center hole within a central hub of the crusher. A method of making or retrofitting a crushing device such as, for example, a cone crusher or other gyratory crusher, is also provided.