This cutaway image of a drum mower illustrates the simplicity of the drum mower design, and built-in advantages including ease of use and low-cost of ownership. Power transmission is through a belt drive system with built-in protection for the mowing unit and the tractor. The bottom of the drum follows ground contours and provides for the optimal mowing height of 2".
The drum itself consists of two disks - a bottom flat section that is free to rotate and follow the ground contour. The bottom section does not rotate with the upper section which the disc blades are attached to. The upper section rotates by power supplied through a belt drive transmission system. There are at least two, and sometimes three blades on the upper section. The blades are easily changed via a blade change bar - no wrenches are required.