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Final cleaning is done by the sieve. It must be open far enough to allow the grain to fall through easily, but not so far that chaff and straw can fall through.
If the sieve is not open wide enough, the grain remains with the tailings. This leads to overthreshing and damages the grain excessively.
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To adjust the sieve, open it until too much foreign material appears in the grain tank and then close the sieve slightly until the proportion of foreign material drops to an acceptable level.
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