Pump making low grinding noise

[Katfish]

Today I have changed my sump pump over to a ocean runner 6500 and its making a low grinding noise.

I have check it over and made sure there was noting at all in the chamber etc it is very clean not even a grain of sand in there.

I have check with a diagram that the prop has all the washers in the right place

What else could cause this low grinding noise?

 

[LancsRick]

Positive it's not an airlock somewhere? Or can you hear a physical scratching?

The other thing worth checking is that on the impeller shaft there are no imperfections.

 

[Katfish]

no imperfections at all

but have have been told it might be ware to the washers and rubber caps so I have ordered a complete kit

 

[foxfish]

Is the pump connected up & running?
Have you tried running it dry just for a few seconds?
A lot of pumps are quite noisy but grinding does not sound good, I can understand humming or vibration type noise but grinding!

 

[Katfish]

I found out what the problem was it was missing a washer from the shaft

So for now I have used a washer I had in my shed a stainless steel one but have ordered a complete set from a

aqua medic stockiest.

Now I have that lovely hum back that I am use too.

How do you stop vibration ?

 

[foxfish]

Not easy, you would probably find the pump is very quiet & vibration free when simply running dry but, as soon as the pump has load it complains!
Certainly a suitable base helps - rubber or polystyrene - also the pipework has an influence.
What I discovered over the years is that most pumps are noisy, however all you need is this http://www.ebay.co.uk/itm/Aqua-Turn-con ... 3f1c1484f0 & you will never look back.....

 

[Katfish]

yep I would love to go with that but how do I plumb the pump into my current system as my sump is low on the ground and no holes in it ?

 

[foxfish]

Drill a hole!
I was thinking about your marine tank too...

 

[Katfish]

Yep not something I would want to do or even try doing is drill a glass tank as if it cracked i would not have a way to replace it quick enough on a up and running tank.

But if i was going to get someone in to do it for me what size hole would need to be drilled?

 

[foxfish]

1" or 25mm would be OK but you really want to buy a suitable bulkhead fitting first.
The Aqua turn uses 21.5mm pipe, I very often convert that to 25mm pipe & that in turn needs a 30mm hole!