Sedra 5000 Pump Vibration

[fatdaddy]

I bought a skimmer off ebay (ASM G3, I think) that came with the usual Sedra 5000 pump. The pump ran rough, so I opened it up and it had a broken ceramic shaft. I ordered a new new one, but the pump still runs about the same: very rough with hardly any bubbles or water flow.

I have another 5000, so I opened it up to make sure that I have the correct assembly and all the parts. I do.

The pump runs, but it's just rough and lots of vibration. I'm thinking there must be something wrong with the coils and not the impeller assembly.

Any thoughts?

[indydog1]

if the ceramic is cracked or chipped at all, it could groove the inside of the chamber. can you swap out with the other impeller for i little while, or just dont run the skimmer till you get the replacement in. just my .02

[Freed]

Check the impellar housing itself. It may have a deep groove or even oval altogether so the impellar isn't actually rotating in a perfect circle.