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Introduzione

Prerequisite only - This guide is only part of other guides.

Removing the grindstones in grinders of the OEM manufacturer Eugster. (Jura and similar ones e.g. AEG and Siemens, Bosch, Melitta, Nivona, Krups)

Parti

  1. 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.
    • 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.

  2. In the next step be very careful not to loose these three springs, balls and cartridges. Now the coffee bean feeding helix (white) can be removed. Very very carefully lift off the grinder cone including its drive. Now the coffee bean feeding helix (white) can be removed. Very very carefully lift off the grinder cone including its drive.
    • In the next step be very careful not to loose these three springs, balls and cartridges.

    • Now the coffee bean feeding helix (white) can be removed. Very very carefully lift off the grinder cone including its drive.

  3. 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.
    • 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.

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  5. 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.
    • 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.

  6. First insert the cleaned driver, then the three sleeves, springs and balls. Now fit the grinding cone on the three balls.
    • 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.

  7. 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.
    • 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.

  8. 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! 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!
    • 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!

Conclusione

Now follow the remaining steps in reverse direction to reassemble your device.

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VauWeh

Membro da: 19/10/2015

76.759 Reputazione

87 Guide realizzate

Thank you for the guide. I have FILL BEANS error, I followed this guide. No problem. But with new burrs, I still have FILL BEANS error. Any idea why? My burrs were not so bad. I only have 2000 espressos on the counter.

jimmylasvegas - Replica

Which model of Jura is it?

VauWeh -

Z5, first generation

jimmylasvegas - Replica

So my guess is the “Fill-Bean-Sensor", consisting in an infrared LED and a photocell. You can see it in the bean funnel on top of the mill. Perhaps you disconnected it while ?

VauWeh - Replica

The fame “fill beans” error is that not enough coffee is entering the brewgroup. I have cleaned the grinder and the chute to the brewgroup. Grinder spins fast. But very little coffee actually go down into the grinder. I have watched several youtube videos on grinder calibration. But no idea. If you use the 2 big espresso cup button, then no error because the grinder runs a longer time. But still not enough coffee for 2 large cups. Just no error.

jimmylasvegas - Replica

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