US Patent 7540135 Mower deck height adjustment

A riding mower with a height adjustable mowing deck includes an operator seating area and a cam wheel rotatably connected to a frame of the mower adjacent to the operator seating area. The mowing deck is supported below the frame of the mower by a deck lifting system comprising a plurality of cooperating bell cranks pivotally connected at various locations to the frame. One of the bell cranks is connected for common rotation to a secondary arm aligned in a common plane with the cam wheel. A rod pivotally connects at one end to the secondary arm. The opposite end of the arm contacts an edge portion of the cam wheel. A selector wheel associated with the cam wheel, for adjusting the cam wheel edge in contact with the rod, has a scalloped perimeter edge. A detent engages the scalloped edge to maintain a selected position of the cam wheel.