Abstract: This invention relates to diamond drills drive apparatus and in particular, to an improved diamond drill chuck jaw carrier and related assembly. The apparatus comprises a hydraulically operated vane motor concentrically mounted about the axis of rotation of a drill rod string for rotating two independently driven chuck jaw carrier assemblies about the axis. Each chuck jaw carrier assembly receives the rod string within a central aperture and comprises floating chuck jaw wheel assemblies and flying wedge assemblies. The flying wedge assemblies slidably force the chuck jaw wheel assemblies into removable engagement with the drill pipe. The chuck jaw wheel assemblies further comprise hydraulically operated vane motors driving tiers of chuck jaw wheels. The chuck jaw wheels have toothed surfaces for gripping engagement of the drill pipe.