Generator Gasket

1. Removed, cleaned and disassembled generator unit.
2. Removed 2 O-rings on generator unit and one on boiler.
3. Lubed and replaced O-rings.
4. Lubed moving parts in generator and reassembled.

Espresso pucks are now packed tight and eject completely. The coffee is now brewing properly.

1. From YouTube, I realized that there was cleaning/maintenance that I had not performed (and was not described in the manual).
2. After investigation, I decided to replace some O-Rings and ordered them and some food-safe grease for lubrication.
3. I disassembled the unit based on info form YouTube.
4. Cleaned the parts.
5. Replaced the O-Rings.
6. Lubricated all available sliding surfaces.
7. Reassembled the unit.
8. All is working well and with much less strange noise.

This beautiful bean to cup machine had had a hard life when I picked it up on eBay, but the seller said the machine turned on and warmed up. Critical to a cost effective repair. These things need a deep clean...A complete strip-down..Even when normally working. This machine didn't appear to have ever had a clean.

Strip down revealed the big seals on the piston and infuser were choked with old coffee, and had gone brittle.

The final problem was a leaky o ring on the boiler, and a broken clip.

Opened service door on Delonghi espresso coffee machine, slipped old gasket off and inserted new gasket. Automatic espresso machine worked perfect ever since gasket replaced.

1. Pulled off the 12-year old loose fitting o-ring.
2. Slipped the new o-ring back on the generator (much tighter fit).
3. Leaking problems solved!

Slid new gasket into place. That was it.

Used angled probe to remove "O" ring and replaced.

Opened coffee maker case, removed generator from interior. (Generator designed to remove for routine cleaning on periodic basis.) Once generator removed, pushed interior sleeve down inside generator, removed retaining clip on bottom of sleeve and pushed sleeve up and out of generator. The sleeve has two "generator gaskets" or large "O" rings. Replace those "O" rings and lubricated sleeve with food grade grease. Replace sleeve into generator and replaced retaining clip.
Looking inside machine where generator was located, there is a "piston" that has a 3rd "O" ring. Reach inside the machine and remove the "O" ring. Replace that "O" ring and again add slight amount of grease. Before putting the generator back in place, remove the metal screen on top of the sleeve and clean the screen to allow better water flow through it. Replace the screen.
Put the generator back in place and that preventive maintenance should be good for several years depending on usage. Mine was 4 years and the old "O" rings were still reasonably good.

1. Found YouTube channels showing what the problem could be.
2. Found your site and with the excellent diagrams was able to order exactly what I needed. (wish I had asked what size grid was used to take pictures of o-ring gaskets)
3. Took generator/fuser out and took apart to clean and replace gaskets.
4. Bought food grade lubricant and applied. Applied more when I thought I had enough.
5. Put back together, checking the smooth movements of the insides.
6. Less noise and coffee pucks are normal.
7. Coffee tastes better after removing back cover, removing tube, cleaning by using a tube turner (fabric tube turner tool) to pull 5 strands of worsted yarn soaked in bleach solution.

take apart diffuser
clean all parts
clean inside of machine
exchange generator gasket and other parts
Lubricate all parts
put everything back together
snap back into machine