Abstract: A steering clutch assembly attached between an axle and a wheel of a rear-tined rotary tiller allows the implement to be steered. The clutch assembly comprises three coaxial tubular elements, the inboard-most of which is affixed to one of the driven shafts and the outboard-most of which is affixed to a stub axle projecting from a wheel. The inboard and outboard tubular members are connected at a joint that allows the outboard member to freely rotate about the axis of the shaft. An intermediate tubular member rotates with the inboard tubular member and is translated between and engaged and a disengaged position. In the engaged limiting position a portion of the intermediate tubular member bears on a portion of the outboard tubular member and rotationally locks those two tubular members together so that the outboard tubular member is prohibited from rotating with respect to the inboard tubular member.