So ... I have had Ulka pumps and they are built so you can take them apart and clean the little check valves. But the Invensys pumps I've seen are made so they cannot be taken apart. I had a pump that vibrated normally but just wouldn't build any pressure - no matter what cleaning method I tried.
I got a little crazy and decided before I threw it in the trash I would try forcing my way into the innards just to see why it failed.
I searched and searched and couldn't find any information on taking the Invensys apart. I found pictures of how they work inside - but nothing telling how to get them apart (because they are built so you can't take them apart). Now that I've finally managed to do it - I wonder if anyone here is interested in a how-to.
I had to use a cutoff wheel to do it - the way they built the pump (at least the CP3a model I experimented on) the plastic tube with all the checkvalves is held in place by the brass being crimped down around it. I had to grind that crimp completely off - quite a project - but then I was able to pull it apart and clean the checkvalves and reassemble (epoxy to take the place of what the, now missing, crimp was doing). And it pumps again - woohoo!
Now I wish I'd taken pictures of the inside before I sealed it all back together.
If anyone has a dead/weak one they want to donate for a photo journey through the process -- and if anyone is even interested in this sort of thing -- I'd love to cut my way into another one and write up a posting here with pictures of the process.
Thanks for posting the above - I think my cp3a is broken as well and also wanted to dissemble it to see if I could fix it. I was able to pry open the metal exterior brackets to separate the plastic water tube from the solenoid, such that I now have the plastic water tube attached in some way to one of the metal brackets.
But I can't figure out what to do next. Do you (or anyone else who's taken part the same pump) recall what you did next to get to the springs and such inside the tubes?
And if I can't get it open or otherwise can't repair it, what currently available pump would work as a replacement? thanks for any response!
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