Application of cover:

The cover or blade of a drum  is intended for protection of a threshing drum and the drum bottom against grain weight.

Cover structure:

The cover is a long leaf of metal which is bent on width under certain corners. Fasten the drum blade to special details (the drum bottom) by means of bolts of the increased durability. Blades of a drum shall be selected very precisely on weight. If not to provide it disbalance of an otboyny biter will take place that in turn will lead to failure of bearings, cases of bearings and other elements of system of the thresh. As blades of a drum work in the conditions of high vibrations and shock loadings, and thickness of metal is insignificant, they belong to spare parts which need fixed supervision, and rather frequent replacement.

Caution:

Failure can become a consequence of untimely replacement of the blade of a drum:
Bearings - 30-100 EUR.
Housing - 50-100 EUR.
Concave 150 - 500 EUR.