Nivona Caferomatica 770 Grindstone replacement

Step 1

Pull the power plug!
Remove all attachments such as water reservoir, coffee compartment lid, trestle drawer. Remove all coffee beans in the storage container.
Unscrew the five Torx T10 screws on the back.

Step 2

Unscrew the two Torx T10 screws on the front edge of the heat plate.
Do not remove the heat plate completely yet, its supply cables are still connected.
Lift the front edge of the heat plate and slide it forward a bit to clear the tabs on the back edge.
Put the heat plate back down, but in such a way that you can reach the screws underneath.
Unscrew the two Torx T10 screws located under the heat plate.

Step 3

Gently lift the upper side a bit and put it back down.
Push the side panel on the water tank back about 2 cm.
This may jam a bit.
Place the side panel next to the machine. Do not remove it completely yet, the cables of the switch are still connected.
Disconnect the flat plugs from the switch. Be sure to note the order of the cables for later reassembly.
Remove the side panel.

Step 4

Loosen the two insulated flat plugs with which the heat plate is connected.
Lift the top slightly upwards and loosen the nut that secures the eyelet to the green-yellow grounding cable. Remove the eyelet.
Do not remove the top yet, it is still connected with a sensor cable.

Step 5

Lift the top side slightly.
Press down the locking tab on the plug of the white sensor cable and pull off the black plug towards the front of the machine.
Press the two catches of the counterpart on the sides together and slide it out of the opening towards the back.
Now the top is free and you can remove it.

Step 6

Slide the side panel with the service door back about 2 cm and remove it.
This may jam a little.

Step 7

The grinder is damped with foam mats. One mat just rests on top. Remove it.
Work carefully, the mats tear easily.
The grinder is open in front of you.

Step 8

Now the grinder is free. Again take a picture, then pull out the axis of the adjuster with moderate force.
Depending on the model you will find a silicon sealing on top of the grinder ring, remove it.
Watch the fabrication signs , here green. This alignment must be restored later. Now turn the great black gear about 90 degrees counterclockwise. The grinder ring is free and can be lifted off.

Step 9

In the next step be very careful not to loose these three springs, balls and cartridges.
The grinding cone is fastened with a long Torx T20 screw. The screw head is often covered with remnants of coffee beans. Expose the head and turn the screw out counterclockwise.
Now the bean feeder (the small white snail) can be removed. The grinder cone and drive can now also be lifted up carefully.

Grinder screws are often left-hand screws. I assume this is not the case since it isn’t noted.

Lisa W -

Yes, that's true with Jura and others: open it counterclockwise . And you're right: the grinder screws in Saeco machines is left-handed, open it clockwise.

VauWeh -

Step 10

In most of the cases the mill is full of sticky old coffee powder. Clean everything thoroughly for excellent coffee aroma.
The felt ring around the drive axis can be pulled out carefully using a needle. Clean it. For the inner grinder use a paint brush and a wet cloth, the other parts can be cleaned with a brush and warm water. Each part must be dried well before reassembling it.

What is your process for cleaning the felt ring once removed from the drive access?

roger henry -

I use a damp rag with a little dishwashing liquid. Another option is to simply turn the ring upside down.

VauWeh - 14/11/22

Cleaning the felt ring ruined it.

roger henry -

Uuu. How did you do that? You can buy it e.g. here.

VauWeh -

the water expanded the felt ring and it did not shrink back once dry.

Can you recommend a parts place in the US to get this felt washer? The link you sent does not show that it would fit the

Jura ENA4.

-Roger

roger henry -

In this case things are different. Did you really replace the grindstones? Or only clean the device? When my informations are right the ENA 4 is equipped with a "Aroma +" grinder, which means special grindstones, not the normal ones. As far as I know Jura does not sell them separately, only the complete grinder. I think, the felt ring will fit, but I don't know where to buy in the US. I think, the grinder also will work without the ring or cut one of a piece of felt. Good luck!

VauWeh -

If you can't find the felt ring, you have a few options, make one, beg the German jura parts seller to sell you one, or search aliexpress for felt ring, felt washer, felt gasket.

jimmylasvegas -

Hello. The piece where the springs and ball bearings are housed: where can I buy a replacement, please if you know.

Thanks

Farhan Miah -

Do you mean this one? Don't know, If they ship to your country, ask them.

VauWeh - 30/01/23

Step 11

Push both of the small latches alternately. Then the ring cover should come out.
Two clamps hold the grinder ring in its place, push them aside and it should come free.
Again clean everything. Press the new ring and cover in its place. With that the grinder ring is exchanged.

Step 12

First insert the cleaned driver, then the three sleeves, springs and balls. Now fit the grinding cone on the three balls.
Then fit the auger, screw in central screws. When screwing in, push the cone downwards and make sure that everything meshes.
This screw turns into plastic. If it doesn't fit properly, the thread will be damaged. So first turn the screw counterclockwise until you feel that the first thread is engaged. Then tighten it turning clockwise.

I think the balls have to go first. That way the middle stone can slip if the grinder is blocked.

That is also what the exploded diagram that circulates online seems to show.

Comments appreciated.

Mark - 06/09/18

I did this fix many times: the balls are on top oft the springs! They do fit into the corresponding holes in the underside of the cone, as you can clearly see in the picture. If the cone is stopped by e.g. a little stone, the balls come out of the holes saving the motors life.

VauWeh - 06/09/18

Thank you for the explanation! It is clear now.

Mark - 07/09/18

Everything is in right place

I push as hard as I can. But it seem the that the screw is turning in the void. I remove all the part to see if the hole was strip , the screw seem to enter firmly

jason warren - 17/12/19

In this case I fear, you have to buy a new grinder. Replacing it is straightforward.

VauWeh - 17/12/19

i find a bit longer screw and it work but now the black ring is spinning in the void. the black outer ring and the white outer ring are suppose to be turning together ?

jason warren - 17/12/19

I have one more spring and ball, that are half a diametr of the rest. Can’t figure out where do they go?

Aleksandr Sevastjanov - 08/02/20

Might be the ball and spring beyond the big black gear, makes the “click", when turning it.

VauWeh - 08/02/20

Thanks. I followed the steps on the Nivona grinder and replaced the springs and the balls in the exact order. Now the grinder can only grind finely and this is too find for my brewer and hence my espresso machine is clogged. Can anyone see what when wrong after the reassembly?

haydaru - 29/08/20

I think the parts don't fit together properly. First: There are three holes on the bottom of the cone that the balls must fit into. Second: at the bottom of the helix are two tabs that must fit into corresponding grooves.

VauWeh - 29/08/20

How tight should you screw this screw in? Until it can no longer turn the screw driver?

roger henry -

Short answer: yes, not to hard. The screw ist spring loaded and cannot move easily. Be sure that the helix fits.

VauWeh -

Step 13

Insert grinding ring. The black gear is turned to the right again until the three marks are aligned. Then reinstall the adjuster drive shaft as it was originally.
The adjustment oft the new grinder burrs musst not necessarily be the same as the old ones. You can approximately find the mean position, which was marked before, by turning the outer ring as far as possible clockwise, then turning it fourteen clicks backwards.
It is a good idea to check if the grinder rotates freely. You can remove the meal hopper and look at the millstones from the side.
Then install the remaining parts in reverse order.
You can set the grinding degree nicely by placing an empty roll of toilet paper perpendicular to the open mill and filling it with a few coffee beans. Plug in the plug (be careful!), choose a cup of coffee and watch as the coffee grounds fall out of the grinder.

i turn the black gear but the white one doesnt turn any more , they are suppose to turn together?

jason warren - 17/12/19

By turning the the black gear the grinder ring moves a little bit up and down and changes the grinder setting. The white ring holding the grinder ring indeed does not move. Or do you mean the big white gear beyond the black one? If the black and the white gears are not connected, press firmly the black gear down, until it clicks in.

VauWeh - 17/12/19

i remove a part the black and the white ring, it seem that there was black pin on the black ring that was maybe glue to the white ring ? but it seem broken or unglue , it whitish on the tip like if it was broke

unless i see nothing that make those 2 ring jam together. maybe i should try to reglue with a dot of epoxy ?

jason warren - 17/12/19

Buy a new one, it's cheap! It ist just clicked in. Good luck.

VauWeh - 17/12/19

Thanks ! Alot!

jason warren - 17/12/19

Super Anleitung. Die neue Mahlsteinen war deutlich anders als die alten. Ich habe die Einstellring so weit wie möglich nach rechst gedreht, dann 14 Zähnen nach links, wie beschrieben. Die Maschine malt jetzt perfect. Danke.

Joe Crites - 29/01/20

if you move the ring fourteen clicks back, it means maximum opening or closing of the setting. Hope you understand what I mean. With these fourteen clicks, how to set this adjustment stick

Jaroslaw Tylutka - 07/01/21

First turn the ring clockwise so that the grindstones sit tightly on each other. Then open it by turning the ring counterclockwise for fourteen clicks. This is a medium setting. You can do a fine adjusting later. Watch the grinder in action using the toilet-paper-roll method. Good luck!

VauWeh - 07/01/21

Ok. Thank you very much.

Jaroslaw Tylutka - 07/01/21

I am looking to do the same replacement. The instructions looks great but I cannot find anywhere where to buy the two pieces grinder compatible for a ena micro 1. Any suggestions where I could buy that?

thomas herby -

This is indeed difficult. The grinder of the ENA Micro 1 is special. So far I have unfortunately only found the complete grinder, very expensive. (~ 150€). A reason not to buy this model, but that's no use to you anymore.

VauWeh -

or a cheaper used one (~70€): https://www.jura-ersatzteile-shop.de/mah...

VauWeh -

you can get that on eBay and aliexpress/alibaba. if you like take out the burrs and and measure them and I can tell you if they are the common ones being sold everywhere.

jimmylasvegas -

If you mark and line up all the rings as well as the spot on the “coarse -fine” adjuster and return them to the exact position at the end, do you have to bother about turning the clicks counterclockwise at the end.

Ken Tuerk -

Well, try it. Normally, everything should work fine and you can check the result on the grind. But the method with the 14 clicks is really simple.

VauWeh -

Great video. Ma problem is, there were only one mark on the rings, and I didn't mark the rings. Will the 14 clicks be enough initial adjustmet? Why is part of the black ring raised, and where does it go in relationship to the coffee shute? Thanks for any help

fred4ernst -

Did you remove the black ring? If the (green?) mark on the outer white ring is on 12, the middle of the raised part is on 8, as far as I remember. It serves as stop, there is a counterpart in the bean reservoir. Not really important and not in every model. And yes, the 14 clicks work fine. Try the grinder open, putting an empty toilet paper filled with some beans on it.

VauWeh -

Thanks for the instructions. It all worked out, but for me it was easier to remove the whole grinder housing (3 screws) in order to remove the top part (step 7).

Also, before removing the grinder cone and the 3 springs and the 3 balls, a smaller spring and a smaller ball fell off somewhere and I could not figure out where to put them. Again all 3 springs and balls are as you describe but the extra smaller one I left out while re-assembling.

At the end it is a success, but was curious if you knew where these extra parts are from

GA376 -

Sounds like the that's what makes the clicking sound when you adjust the grinder from course to fine.

If you remove the top, black ring with the gear teeth, you will expose the off white plastic, it has holes all the way around,

that where the ball and spring go to make that clicking sound. Not a big deal, I misplaced mine and I've been using the grinder

for a few years now without it. https://www.juraprofi.de/Jura-Ersatzteil...

jimmylasvegas -

@jimmylasvegas is right. This ball is the detent for the adjustment of the grinder.

VauWeh -

Step 14

These two pictures are no fake: Before repairing the grinder the coffee is thin and transparent. With new stones the coffee is strong and has a fine crema. The repair was a real success!

This is very helpful. My question is that when disassembling the unit, a very small ball came loose (not one of the balls under the grinder cone that you flagged). Now my grinder does not adjust for a fine grind so i think the ball was somewhere in the grinder adjustment assembly?

Thanks

Jared Rocco - 18/11/19

Yes. This must be the ball in the grinder adjustment. Have a look to the steps 5 - 7 in the guide for saeco: https://de.ifixit.com/Anleitung/Saeco+Vi..., the grinder is nearly the same. The big black gearwheel can be lifted upwards using a little force and you can see all those little holes - and the ball was sitting under one of them thus keeping the adjuster in position. Hope it helps and you can fix it!

VauWeh - 18/11/19

You lost your balls? there’s 2 ball bearings that make the clicking sound as you adjust the grind. I lost both of mine, never found them again. Anyone know what size they are? you can buy new balls at a local bearing store or on alibaba/ebay.

jimmylasvegas - 22/11/19

Hello VauWeh,

I’ve cleaned my grinder and assembled it back. One thing I can’t restore is that grinder adjuster doesn’t click anymore. Could you please advise something that might affect it? The coffee is perfect but the grinder setting doesn’t stay in place. When it grinds, vibration makes it move towards a more coarse setting.

Poogle Gixel - 18/08/20

Hello, as I mentioned in my answer dated 18.11.2019, I suppose you lost the ball, which makes the clicking sound and holds the position of the big wheel. Sorry, I don't know a solution for that.

VauWeh - 18/08/20

Perhaps the spring and ball for DeLonghi will fit. They are available here.

VauWeh - 18/08/20

Another possibility: buy a used grinder, like this one

VauWeh - 18/08/20

At least I found it here, indeed the same as DeLonghi. Diameter is 3.2 mm.

VauWeh - 18/08/20

Nivona Caferomatica 770 Grindstone replacement

Introduction

Tools

Parts

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Step 7

Step 8

Step 9

Step 10

Step 11

Step 12

Step 13

Step 14

Author

VauWeh

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