Abstract: The specification discloses a pavement grinding apparatus for moving across and grinding a paved surface. The apparatus includes a main frame that is propelled across the surface and a subframe that is connected to the main frame by a sliding connector that allows free vertical motion of the subframe. A grinding unit is mounted on the subframe and is supported by at least one grinding unit roller which is operable to control the grinding depth of the grinding unit independently of the position of the main frame. A boom extends forwardly from the subframe and has at least one boom wheel mounted on the forward end of the boom. The boom in cooperation with the subframe stabilizes and creates a planing effect for the grinding unit. The subframe may be lifted vertically by a plurality of cables and a hoist mechanism with the sliding connector allowing and guiding such vertical motion.