Abstract: A rotary cutter apparatus is provided for shredding vegetation in order to generally reduce the size of cut vegetation and more evenly distribute the vegetation once thus cut. Counterrotating, coaxial blade assemblies are provided. A multiple gear drive shaft has one drive gear for engaging and driving one blade assembly and another drive gear for engaging and driving the other blade assembly. The multiple gear drive shaft also has an interchangeability characteristic which determines the respective rotational directions of the counterrotating blade assemblies. Enhanced gear and bearing lubrication is also achieved.