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Introduzione

If your machine only pruduces thin and weak coffee the grinder maybe dull. The instructions are suitable for nearly every model of Jura and similar ones e.g. AEG and Krups

Parti

  1. The instructions are suitable for nearly every model of Jura and similar ones e.g. AEG and Krups.
    • The instructions are suitable for nearly every model of Jura and similar ones e.g. AEG and Krups.

    • Unplug!

    • Remove the water reservoir.

  2. On the rear side is an obstacle: four "oval head screws" looking like rivets. You can remove them using a special oval drive bit. They are sold at iFixit with the tool kits as well as  some Jura suppliers or somewhere in the internet. Jura wants to keep us out of our own machines! Using an oval head bit you can screw them out. If you haven´t got one you can carefully use pliers. It is a good idea to later change the screws for normal ones. Beneath both top side covers are two Torx T15 screws. Remove those. Now lift off the whole top cover. Sometimes it jams  and you have to use a bit of force.
    • On the rear side is an obstacle: four "oval head screws" looking like rivets. You can remove them using a special oval drive bit. They are sold at iFixit with the tool kits as well as some Jura suppliers or somewhere in the internet. Jura wants to keep us out of our own machines!

    • Using an oval head bit you can screw them out. If you haven´t got one you can carefully use pliers. It is a good idea to later change the screws for normal ones.

    • Beneath both top side covers are two Torx T15 screws. Remove those. Now lift off the whole top cover. Sometimes it jams and you have to use a bit of force.

    • The side covers must be pushed backwards by about 1 cm. Sometimes this is a little bit difficult to move. If necessary, wedge a plastic opening tool into the gap between the side covers and the front panel. The rear cover can be easily removed.

  3. This guide is suitable for many models of Jura Impressa and similar ones of AEG and Krups. The results of this repair are amazing!
    • This guide is suitable for many models of Jura Impressa and similar ones of AEG and Krups. The results of this repair are amazing!

    • On the picture you can see a new pair of grindstones on the left side and an old pair on the right. The stones consist in a ring and a cone.

    • You must not necessarily remove the side covers.

  4. Make a photo of the adjuster in order to restore the situation later, then pull it out. There are two holes in which two screws hold the container for the coffee. Clean them, then unscrew them. The protection cap must not be removed.
    • Make a photo of the adjuster in order to restore the situation later, then pull it out.

    • There are two holes in which two screws hold the container for the coffee. Clean them, then unscrew them. The protection cap must not be removed.

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  6. Now the grinder is free. Again take a picture, then pull out the axis of the adjuster. There is a silicon sealing, 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.

    • There is a silicon sealing, 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.

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

    • Now the coffee bean feeding helix can be removed. Very very carefully lift off the grinder cone

  8. Clean everything well. The felt ring around the drive axis can be pulled out using a needle. Clean it. For the inner grinder use a wet cloth, the other parts with brush and warm water. Each part must be well dried before assembling it.
    • Clean everything well.

    • The felt ring around the drive axis can be pulled out using a needle. Clean it. For the inner grinder use a wet cloth, the other parts with brush and warm water. Each part must be well dried before assembling it.

  9. Push both latches alternately. The ring cover comes out. Two clamps hold the grinder ring, push them and it is free Again clean everything. Press in the new ring and cover.
    • Push both latches alternately. The ring cover comes out.

    • Two clamps hold the grinder ring, push them and it is free

    • Again clean everything. Press in the new ring and cover.

  10. 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.

  11. 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.

  12. 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.

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Membro da: 19/10/2015

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