A brush cutter, also known as brush saw or clearing saw is a garden tool as well as an agricultural tool.  It is used to trim weeds, small trees, and another foliage that are not accessible by a lawnmower or rotary mower.

It consists of:

  • A power unit held close to the body.
  • A pole through which the power is transmitted.
  • A rotary cutting head at the opposite end of the pole to the power unit.

There are three main types of power unit:

  • Gas engines, either two or four stroke, are used on the more powerful units.
  • Electric motors connected to mains power by a power cord.
  • Cordless electric motors powered by rechargeable batteries.

There are three types of shaft:

  • Basic consumer units use a curved shaft, similar to a basic line trimmer.
  • More professional units use a straight shaft with a gearbox at the cutting head end.
  • Top of the line units use a straight “split” shaft with a disconnection point partway along the shaft, allowing the cutting head to be replaced by other accessories such as pole pruners, cultivators, edgers and hedge trimmers.

Handles vary on brush cutters depending on weight and size of the unit. Larger, more powerful saws employ bike handles (two handlebars on either side of the shaft), and smaller units use a D-shaped handle mounted on the shaft. Heavier saws usually require harnesses for safety and reduced fatigue. The shaft on units requiring a harness has multiple slots for the harness to attach for balance of the entire unit.

Furthermore, the engine used in these tools is cooled, 4 stroke cylinder gasoline. The engine power is 1kw/6500r/m, and the engine displacement is 37.7cc.  The capacity of the fuel tank is 14.2 liters, and the carburetor is the diaphragm type.