I don't think the pumps run on a rheostat here's a rebuild tutorial
http://www.instructables.com/id/Rebuilding-an-ULKA-Vibratory-Pump-Espresso-machin/ i've never had luck at repairing them here's another set of links http://ulkapumprepair.blogspot.com/ the ulna is the one in the machines i use, i think they can be bought relatively cheaply if you shop thanks, xx rick Rick Hawkins On Feb 12, 2015, at 8:34 PM, mercedes-requ...@okiebenz.com wrote: > > From: Mountain Man <maontin....@gmail.com> > Subject: Re: [MBZ] Espresso > Date: February 12, 2015 7:45:20 PM EST > To: Dan Penoff <d...@penoff.com>, Mercedes Discussion List > <mercedes@okiebenz.com> > > > Dan wrote: >> Interesting. I think mine is the same way. Maybe the caps(s) for the pump >> are old and should be replaced? >> >> I may take a look at mine this weekend and see. I can't imagine it would be >> difficult or expensive to replace. >> >> As for the O ring, I can't say. I haven't looked at it or tried to remove >> it. Mine seals well. So I'm figuring I'll leave well enough alone. If you >> find a suitable replacement let me know, as I would certainly like to have a >> spare. >> > > My previous response to this okiebenz message went to Dan, not the > list, by mistake. I think there are some electronic design wizards > here that can answer the current problem with the machine we each are > using. This is a vibratory pump in a 40 year old espresso machine > made in italy but wired for 110v. I think we can muster a picture of > the control knob if needed, plus maybe a picture of wiring. There is > a unique feature in this espresso machine - the speed of the pump can > be varied using rheostat control knob. 12 o'clock is silent pump. > Turn clockwise (cw) and the pump speeds up water thru thermoblock for > shots. Turn counter clockwise (ccw) and the pump is used to produce > steam for foamed milk. cw turn speeds pump goes from "-" to "+" as > noted on the control. ccw control goes from "-" to "+" to denote > amount of steam? However, steam production is not ideal so we are > wondering if old caps or other electro-gizmo might be old after 40 > years. Perhaps the rheostat needs a spray of DeOxit? What else in > this type of electric control can go bad in years of very light > service? > > Dan, perhaps we need to read the instructions? > > Below is my description to Dan yesterday about what I am seeing - > Dan's notes above show he is in approximately the same quandry (choppy > vibe pump noise) about producing steam. As noted, most espresso > machines do not have a control that varies the pump speed. > mao _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
