Patent ID: 7302734

Claim:
A self-propelled ground cleaning apparatus powered by a hydraulic motor, said apparatus comprising: a rotating brush engaging the ground for removing debris from the ground; a holding tank open at the top for receiving and storing the debris; a fan for drawing air and debris from adjacent said rotating brush and over the open top of said holding tank and allowing the debris to drop into said holding tank; a filter disposed above the open top of said holding tank; and a housing extending from adjacent the open top of said holding tank to said fan and enclosing said filter, wherein an inner portion of said housing forms an air duct for directing air through said filter and allowing dust in the air to be trapped in said filter for deposit through said open top into said holding tank by vibrating said filter when air is no longer drawn by said fan, said housing including a closed reservoir storing oil for the hydraulic motor, the oil in said reservoir is cooled by air drawn through said housing by said fan, wherein said housing is formed by an outer wall and includes an inner wall, said outer and inner walls forming said reservoir storing the oil for said hydraulic motor.