Grain Cleaning Process

The effectiveness of the chaffer and grain sieve separating action is increased by an intensive fan blast. Thus the chaff, which is lighter than grain, is blown to the rear.

NOTE: The blast should be as strong as possible, but grain loss should be kept to a minimum.

As a result of "overthreshing", the cleaning unit becomes overloaded, resulting in poor separation of the grain from the chaff. A considerable amount of grain is lost, dropping to the ground with the straw at the rear of the combine.

Check:
· Concave spacing too narrow?
· Cylinder speed too high?
· Is intensity of blast adapted to sieve load?

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