Material collection apparatus

A rotary lawn mower mounted on a tractor is equipped with a blower operable to move grass clippings and loose debris from the mower into collection bags. The blower has a rotatable impeller located within a housing attached to the side of the mower. A belt and pulley drive connects the horizontal impeller shaft to an upright blade drive shaft of the mower to rotate the impeller concurrently with the grass cutting blades of the mower. A pair of idler pulleys mounted on one or more supports secured to the housing aligned a single endless belt with the vertical pulley on the impeller drive shaft and change the orientation of the belt from horizontal to vertical and back to horizontal as the belt travels around the pulleys mounted on the impeller and blade shafts.