A harvest sweeper attachment system (10) is provided for attaching to a harvester machine (12) having a collection aperture (14), for use in propelling desired objects (11), such as nuts, toward the collection aperture (14). The system (10) preferably has two sweep units (20) mounted on each side of the harvester machine (12) at a forward angle, each including a rotating rake subassembly assembly (34). The rake subassembly (34) is characterized by having three axially spaced freely rotating tine bars (88), each having a depending array of tines (90), mounted between a proximal rake plate (74) and a distal rake plate (76). The proximal and distal rake plates (74, 76) are mounted at about a forty-five degree angle such that the rake subassembly (34) has an offset parallelogram aspect.
