Tunze making screaming noises

[Reef Gambler]

Hello,
I have a pair of Tunze pumps. I can't remember the model number, but they are the ones with the propeller. Any way, one of them is making a horrible screeching noise. Are these repariable, or do I need to ordrer a new one?
Thank you

[shawnz28]

Is the noise coming from the silver box? If so ....

http://reefcentral.com/forums/showthread.php?threadid=720419

[rvitko]

As Shawnz28 pointed out, usually this just means they need to be cleaned.