Question about Nuova Simonelli MDX Electric Grinder

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I can hear the grinder on nuova simonelli try to gring, but it seems like soemthing is stuck. how can i fix this?

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Remove the bean hopper and vac out all beans, then remove black cover, then 3 phillips screws, and top part of burrs should come off. Clean our chamber then reassemble. DO NOT TURN ON. Make sure middle nut in chamber spins freely, use fingers to turn, if not adjust setting to coarser, until it moves freely, then turn on grinder. All you have to do now is set your grind.

Posted on Jan 05, 2011

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Posted on Jan 02, 2017

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My nuova Simonelli oscar doesn't heat


This is a good little machine. its basically a commercial machine shrunk down for home and is worth repairing even if you have to take it in. go to nuova simonelli usa website and download the parts manual and check the 009500014 thermal fuse and the 09500004 highlimit thermostat and see if one is gone or tripped. check the pressure stat, check if power to elements and if there is check to make sure the elements havnt failed from being heated with no water. like i said this machine is on par with a rancilio silvia so well worth repairing.
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1 Answer

How do i adjust gran throw on a simonelli grinder


Grinding setting is one simple operation but requires bit patience:

  1. Turn on your grinder and continue setting to fine while burrs are spinning, you stop when you hear metal to metal touch sound(burrs maximally closed finest grinding)
  2. From that point go back quarter of revolution and mark the spot where you stopped with marker to body of grinder and setting plate with one line
  3. Grind little amount of coffee only to fill one sector of dosser than test it at your machine (if it leaks too fast and with yellow color of cream you should go to more fine>><< if it does not leak from the filter holder or it leaks very slow you go to in opposite way.
  4. You test grinding few times bit after each reset of plate grind little amount and take that in one other pot (that will provide to have pure new granulation)
  5. After setting measure the grounded coffee that comes out from dosser it should be about 7 grams, better measurement you can get if you measure 10 doses in one place because you don't get never same amount from 6 sectors of dosser.

PS: the pump pressure of coffee machine should be from 8 to 10 bar and steam pressure should be from 1.1 to 1.5 bar> depends on type of coffees you use.


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What is the proper number setting for the grinder


There isn't one, because your grind depends on the bean you are using, the temperature and so on. The best thing you can do is clear the burr chamber of beans, then turn grinder clockwise until you can no longer turn the brass fitting in the middle, then turn counter-clockwise to about 4 numbers that will give you a nice starting point to setting your grind.

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Fixed it Myself

Red wire --> Cap1
White wire --> Cap2
Blue wire --> PWR Switch
Brown wire ---> Thermal Protection Switch

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1 Answer

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The pumps in these are low resolution pumps and don't seem to take a lot of stress. We ran the same machine with three groups 362 days a year. You probably need to replace the pump. You should watch your gauges and be pulling 9 - 10 bars when pulling a shot. The top side of your gauges is water pressure coming in. Sounds like a new pump. Good luck.

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