Recently started brewing on a 20 liter Braumeister and the pump started squealing on the first brew.
I took apart the pump and the impeller had rubbed up against the metal housing. You can see the gold mark on the impeller where it scraped:
I called up the company i ordered from (Morebeer/Moreflavor) and they decided to send a whole new pump instead of just an impeller.
Here you can see both pumps, the old one above and the new one is the blue one on the bottom:
over twice the wattage:
The impeller on the new pump looks to have more of a twisted blade design to it:
It also has a metal bottom to it and the magnet holding in the impeller is not nearly as strong so it spins easier.
Replacing the old pump was very easy
Remove pump piping/pump
and tighten on and plug in the new one and you are done!
The old pump was quiet, this one is completely silent, so much so that i took a impromptu nap next to the machine while mashing my "dumb blonde ale" last night
I am going to step up my grain bill slowly and see just how much this new pump can handle. I know the old one could only push water through about 12 lbs in the malt pipe.