Group Gasket Replacement: The Gaggia Classic
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Group Gasket Replacement: The Gaggia Classic

The group gasket is a rubber gasket that rests inside of the group head of a semi-automatic espresso machine and creates a seal to prevent leaks. Over time, the gasket becomes worn through use, which can lead to leaking during the brewing process. When this happens, the group gasket must be replaced to ensure that the machine continues to function properly. The following tutorial outlines the process of properly replacing a worn group gasket.

*Before attempting to replace the group gasket, the machine must be powered off, unplugged, and cool to the touch.

Begin by removing the water reservoir, the portafilter, the drip tray, the drip pan, the water reservoir cover, and the pipe that drains into the drip tray.

Group Gasket

When all of these parts have been removed, lay the machine down on its back.

Group Gasket Removal

Before removing the group gasket, the shower screen and the shower holding plate must be removed beforehand. The shower screen is held in place by a number 2 Phillips-head screw, and the plate behind it by a set of 5mm Allen screws. Remove the shower screen, followed by the holding plate.

Group Gasket Removal

Group Gasket Removal

If the shower screen plate does not fall out of the machine once the Allen screws have been removed, it may need to be gently pried out. A flat-head screwdriver or knife works well for this purpose. If the plate still will not come out, a pair of needle nose pliers can be inserted into the holes for the Allen screws and turned until the plate comes loose.

With the screen and plate removed, the group gasket will now be accessible.

Depending on the state of the gasket, one of several methods may be employed in its removal. Most commonly though, the gasket can be removed by prying it from the group head. The gasket should be removed from the inside out (pry from the inside of the circle outward, not from the outer edge).

Group Gasket Removal

Alternatively, if the gasket cannot be pried loose, a screw and a pair of pliers can be used to remove it. Drive the screw securely into the gasket using a screwdriver, taking care not to go all the way through.

Group Gasket Removal

When the screw is secure, grasp it (with pliers if necessary) and pull until the gasket comes out.

Group Gasket Removal

After the gasket has been removed, make sure the surface inside of the group head is free of any debris or anything else that could block the new gasket. Insert your new gasket and replace the shower screen and shower screen plate. Once you have returned all of the machine's components to their proper places, lock the portafilter into the group head. Remove it and lock it several more times to help secure the gasket.

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