Claas sieves

The pre-sieve is located at the front of the cleaning system and is responsible for separating the larger debris, such as straw and chaff, from the grain. It works by using a series of oscillating screens that shake the crop as it moves along the cleaning system. The larger debris falls through the pre-sieve and is collected in a separate compartment, while the grain and smaller debris continue on to the main sieve.

The main sieve is located behind the pre-sieve and is responsible for separating the smaller debris, such as dust and broken kernels, from the grain. It works in a similar manner to the pre-sieve, but has a finer mesh that allows only the grain to pass through. The smaller debris falls through the main sieve and is also collected in a separate compartment.

Both the pre-sieve and main sieve in Claas combine harvesters are adjustable, allowing the operator to control the amount of material that is separated from the grain. This is important for achieving high-quality grain and minimizing losses during the harvesting process. The sieves are also designed to be easily cleaned and maintained, reducing downtime and improving overall efficiency.