A lawnmower includes a belt cover attached to a cutter housing via one or more interlocking tabs and pockets. The lawnmower may include a cutter mounted to a shaft oriented in a vertical direction. The lawnmower may include a rear axle oriented in a horizontal direction. The lawnmower may include a cutter housing defining a lower opening below the cutter, a belt opening between the shaft and the rear axle, and at least one discharge opening. The lawnmower may include a belt cover including a ring portion at least partially surrounding the shaft above the cutter and a guard portion extending toward the belt opening. The belt cover may include at least one tab that engages a corresponding pocket on the cutter housing adjacent the belt opening.