Jura Z Model Exhaust valve repair

はじめに

Jura Z models have two outlet valves. These valves must be checked more often. The valve plunger often breaks off and the plunger then gets stuck. The seals age over time. A remedy is a new plunger, preferably made of metal.

必要な工具と部品

手順1 Opening the Jura Z series housing

Jura Z Model Exhaust valve repair, Opening the Jura Z series housing: 手順 1、 1の画像 1

Unplug the machine from the power outlet
Remove all attachments: water tank, drip tray, aroma lid

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手順2

Jura Z Model Exhaust valve repair: 手順 2、 3の画像 3

Turn the machine so the back is facing toward the front.
The Jura sign must be removed. Turn it a few millimeters counterclickwise.
If this becomes difficult use a suction cup to assist.
Remove the Jura sign.

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手順3

Behind the Jura sign are two screws with an oval head. They have to be removed.
These screws have an oval head that makes them look like rivets (picture 2). You need to use a special bit for their removal. If the right bit is not available, it could be done with a pair of needle nose pliers. Jura wants to keep us out of our own machines!!!!

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手順4

Push the back down a bit and then remove it.

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手順5

Pull the right side panel- as seen looking to the frontpanel - backwards and take it off.
Sometimes it gets a bit stuck and may require a bit more of a pull.

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手順6

Jura Z Model Exhaust valve repair: 手順 6、 3の画像 3

In this step, you should remove the screws of the left side panel. The side panel can only be removed after removing the top cover.
Remove the Torx T15 screw on the front wall of the side panel.
In the side part there is a lid over the brew group. The lid is fastened at the top with two oval head screws. Remove those to remove the lid.
With the cover removed the brew group becomes visible

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手順7

Jura Z Model Exhaust valve repair: 手順 7、 3の画像 3

This step shows how to remove the top cover
Remove the powder tray and all coffee beans.
The cover is fastened with three Torx T15 screws. Those are easily visible under the covers as well as the small cover on the left back side.
Remove the two Phillips screws on the bean container and remove the bean container.
Lift the cover upwards.
If it is stuck, use a plastic opening tool to carefully pry it open.
The lid of the bean container is held in place by a small, strong magnet that loosely rests. It is either in the green marked recess, or it remains hanging on the bean container. Make sure it is not lost!

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手順8

Pull the left side panel backwards to take it off.
For some repairs it is not necessary to remove the left side panel.

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手順9 Repair outlet valves

Jura Z Model Exhaust valve repair, Repair outlet valves: 手順 9、 2の画像 1

Jura Z Model Exhaust valve repair, Repair outlet valves: 手順 9、 2の画像 2

Pull out the clamp on the lower outlet valve.
Carefully slide the lower outlet valve to the left so that the pressure hose comes out. Watch out for the O-ring. It will either get stuck in the valve or on the end of the hose. Replace it with a new one when reassembling.
Lift out the valve. The two hoses on the left can stay on.
The cover on top of the valve is held by three detents. Gently release the three detents with the flat end of a spatula and lift the cover straight up.
Carefully lift out the spring and valve stem. Pay attention to the sequence for later reassembly.

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手順10

Jura Z Model Exhaust valve repair: 手順 10、 3の画像 3

Open the cover on the upper outlet valve in the same way.
Gently lift out the valve plunger.
Both valve plungers on this unit were broken. They were replaced with new ones. The plastic model is shown here, but a metal valve plunger will never break again.
If the plunger is still good, all you need to do is install new gaskets. Coat the seals thinly with food-grade silicone grease.