Expobar Brewtus IV rotary pump buzzing noise

by **JoeWeiss** on Wed Mar 23, 2011 7:30 pm

My Brewtus IV is making a a new buzzing noise that it wasn't making before. The machine is two weeks old and was very quite until recently. It has now been making a strange buzz that is quite loud. Here is a link to some videos of what's going on http://www.youtube.com/user/BrewtusIV

Has anyone experienced this before? Please let me know what's up with that.

by **Paret** on Wed Mar 23, 2011 8:29 pm

Sounds to me like metal rattling.

Cup warmer, drain pan maybe? :?:

Did you drop a spoon inside? (Just kidding).

Good luck.

by HB on Wed Mar 23, 2011 8:53 pm

Sounds like the braided stainless steel line is touching the overpressure valve. From your second video:

Other possibilities include:

Pump cavitation due to restricted inlet line - check if water filter is clogged, inlet pressure regulator set too low, etc.
Sympathetic vibration with some other component - use cardboard tube held to ear as stethoscope to locate buzzing
Brew pressure gauge damping coil is full of water - remove and heat with hairdryer or heatgun
Damaged or cracked pump vanes due to running pump dry (?) - unlikely but included for completeness

Rotary pumps are whisper-quiet; it's what they make vibrate that causes the noise.

by **sweaner** on Wed Mar 23, 2011 9:24 pm

I think Dan has it correct. Sounds like metal on metal crime.

by **JoeWeiss** on Wed Mar 23, 2011 11:15 pm

Thanks guys. It does seem to be metal on metal cavitation. When I hold the waterline still it seems to go away. Also before the metal water line was slightly coiled. When I uncoiled the line and it was straight the noise went away too.

Secondly if you would check out these pics of my boiler leaning on the pump. Does this seem right either? Could this cause any problems?

by **EricC** on Thu Mar 24, 2011 3:52 am

Secondly if you would check out these pics of my boiler leaning on the pump. Does this seem right either? Could this cause any problems?

That is not right at all.

The rear boiler, the coffee boiler if I remember correctly, should be vertical, in exactly the same line as the steam boiler, and definitely not touching the pump motor.

by **Bob_McBob** on Thu Mar 24, 2011 4:14 am

The boilers in my Duetto are at an angle too, though nothing as drastic as that. I've always wondered if it's right.

by **Todd Salzman** on Fri Mar 25, 2011 11:31 am

Joe,
It sounds like the pump is sucking in air or maybe has been damaged from sucking in air. From your pictures I can see that there was some shipping damage. Our CS folks will be contacting you in regards to replacing the machine.
Let me know if you have any questions.

by **JoeWeiss** on Fri Mar 25, 2011 3:46 pm

Todd,
I spoke with Mike Norton today regarding replacing the machine & I'll be sending it back for a new one.
Thanks,
Joe Weiss


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