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  1. #1
    Senior Member gordonw's Avatar
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    Maxi-jet 900 buzzing

    One of the powerheads im using in my cube is a maxi-jet 900. Initially i had set it up as the return pump for the cube and it was running fine and perfectly quiet. Just recently i switched it out for a different pump and moved the 900 into the display as a circulation powerhead and set it up using an impeller first, still running silent. Just tonight i switched it around and replaced the impeller with the propeller it came with, and while the flow has increased significantly...its got a decently loud buzzing sound now -- anyone else use this powerhead and have the same issue with the propeller?





  2. #2
    Senior Member gordonw's Avatar
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  3. #3
    Senior Member Arakkis's Avatar
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    I take it you switched from 2 different pumps and now the origional one for the unit buzzes? Well buzzing could be from the impeller cavetating, did you remember to change the shaft, plascic encaps missing, or maybe something is making it crooked or spin crooked. take it apart and put it back together again and try, try again
    Collector of the rare and weird. Still don't have a Sand Worm yet =)



  4. #4
    Senior Member gordonw's Avatar
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    The rotating arm that holds the powerhead is a little loose, could that be the reason?



  5. #5
    Sea Bunny Khemul's Avatar
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    The Maxi-Jet Pros are a little temperamental. The name "Maxi-Jet" is all that really links them to the quality of the old product. Otherwise they are manufactured cheaper and not as reliable as they used to be. That said, they work but expect them to have some quirks.

    Now the things to check;
    The cage over the propeller needs to be seated properly otherwise it'll make noise. The prop should be stuck in the cage then the cage put on, if you did it the other way you may not have gotten the prop seated perfectly.
    It could just need to break in. I've found they run a little loud when they first start out then calm down after a day or so.
    It could also depend on what is around it. I know having one touching glass get quite noisy, but usually that isn't likely to happen anyways.
    Otherwise, circulation pumps can be like that sometimes. Some run dead silent and other run a little loud, even in the same product line. It is one of the annoying things about circ pumps, especially on the discount end.
    “Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it.”
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  6. #6
    Senior Member gordonw's Avatar
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    Well, i moved it around, took apart and reassembled and it seems to be slightly more quiet...but not silent like the other one. i think your right khemul, thats what i get for the price i paid



  7. #7
    Senior Member Arakkis's Avatar
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    yeah if the shaft moves around while spinning would cause the noise.
    Collector of the rare and weird. Still don't have a Sand Worm yet =)



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