Abstract: Disclosed is a machine for comminuting lawn refuse and having a refuse-receiving hopper with a hopper opening. An aspect of the invention involves a vacuum adapter attached to the hopper and substantially spanning the opening. The adapter has a collar for removably receiving a vacuum hose in air flow communication with the hopper. Preferably, the hose is a ribbed irrigation hose which is widely available at low cost. The hose is retained by a diaphgragm-like resilient member so that the hose readily pivots 360.degree. and is securely retained. Other aspects of the invention involve a closure for the branch feed tube, a novel engine mounting arrangement and a unique strut mount which substantially lessens the tendency of the machine to "walk" during operation.