Richard wrote:
My experience is not with the Eheim pumps, but their canister filters.

The ceramic rod through the impellor assembly should be one piece. it fits
(on my filters anyway) into a cylindrical rubber "bearing" at each end -
this holds the shaft steady and centered. The shaft does not turn.

The coil in the pump head makes the magnet spin on the shaft. As the
impellor can only turn about 180 degrees on the magnet it turns with it and
hence pumps the water.

.


Richard - thanks for the reply.

"The shaft does not turn" - the impeller is attached to the impeller
shaft. iI the impeller shaft does not turn, what causes the impeller to
rotate? - MIke