Jura Impressa Models C E F Exhaust valve maintenance

はじめに

For every maintenance the Exhaust valve should be checked. The valve tappet breaks often or the seal rubber can become brittle over time. You can also replace the whole valve, it is not very expensive.

必要な工具と部品

手順1 Jura Impressa Type C E F opening procedure

Jura Impressa Models C E F Exhaust valve maintenance, Jura Impressa Type C E F opening procedure: 手順 1、 1の画像 1

The instructions are suitable for nearly every model of Jura and similar ones e.g. AEG and Krups.
Unplug!
Remove the water reservoir.

翻訳

手順2

Jura Impressa Models C E F Exhaust valve maintenance: 手順 2、 3の画像 3

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.
You can even create your own specialty tool
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.

翻訳

手順3 Exhaust valve

Jura Impressa Models C E F Exhaust valve maintenance, Exhaust valve: 手順 3、 2の画像 1

Jura Impressa Models C E F Exhaust valve maintenance, Exhaust valve: 手順 3、 2の画像 2

The outlet valve is located in the hot water pipe near the heater. In this model, it is screwed to the carriage for the heating cartridge.
Here the valve body is white. It can also be black.
t is easier if you pull the carriage out a little after the detents are released. However, this is not absolutely necessary.
The black cap on the valve is fixed with three detents. Loosen them carefully with a spudgerl.
Gently lift the cap off. Pay attention to the order of the spring, pressure plate and plunger.
In the second picture, the heater cartridge has been removed for clarity and the pressure hoses are detached, so the valve is easy to see. However, this is not a necessary step.

翻訳

手順4

On this valve, the plunger was broken and had to be replaced with a new one. The plastic model is shown here, but a metal valve plunger would be better as it would not break again.
If the stamp is still good, it is sufficient to install new seals. Coat the seals thinly with food-grade silicone grease.

翻訳