I would check that there is no visible damage to the impeller, impeller shaft, and impeller cover. Do you see any black rubber 'bushings' on each end of the impeller shaft because they should be there and help prevent vibration within the impeller chamber.
If all looks o.k., I would try to prime the filter again and wait until the filter is completely full before you plug it in. If noise still persists, then air is getting into the unit somehow. Check all fittings to make sure they are tight to the hose.
Hope this helps.