A high-durability cam wheel assembly mounted in a shell of a refrigerant recovery machine is disclosed to include an open frame member, rigid wear strips mounted in the open frame member at two sides, a sliding block having friction cylinders arranged in parallel at two opposite sides and respectively disposed in contact with the rigid wear strips and a cam wheel set formed of a first cam wheel and a second cam wheel and inserted through an axle bearing in sliding block for causing the sliding block to move back and forth in the open frame member.