1. Parts such as baffles, roller chain plates, etc. are worn, and should be replaced in this case.

2. The unstable rotation of the mechanical grille may also be caused by the wear of the grooved guide wheel, and it should be repaired or replaced at this time.

3. Check whether the flat guide wheel is worn. In this case, it should be repaired and replaced in time.

4. It may also be caused by the offset of the center of the rotating chain. In this case, it is necessary to adjust the position of the bearing seat to restore the best use condition.

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