Hi there, new to this great community. Really look like a great place.
Anyhow, I think in the case of rotary vane vac pumps they are used and abused and people do not generally change the oil often enough. My background in is chemical process development and scale up in pharma with experience in R&D pharma chem labs and scale up. Just put that there because this is my first post.
I picked up 2 Edwards E2M5 pumps that were out of an organic lab, and I just couldn’t believe how nasty the internals were on tear down; It looks like both pumps are in need of full rebuild, with one even showing scoring on the vanes at least on the first stage. To me, it is obvious the pumps had exposure to acid vapor as evidenced by minor pitting of the metal surface. One of the pumps was even lightly seized. Furthermore, both pumps were leaking at the main case gasket seal (cork as supplied by Edwards in the rebuild kit).
I found that the E2 series has common assembly and rebuild procedures, and luckily I found an outstanding into to pump rebuilds on the eevlog forum. I credit to the eevlog OP for all of the following, whereby he thoroughly documents his rebuild of am E2Mx pump. Her you go:
Special thanks to pcmeiners on eevlog forum for all the below that I copied!
eevblog dot com/forum/review…rhaul-cleanup/
Here are some copy and paste links from the above to save time- get the exploded diagrams and order the parts kits with vanes or without the rotary vanes if yours are still in good shape…
Some parts dealers…
ajvs dot com
capvac dot com
gasflovac dot com/GASFLO_DOWNLOADS.htm
Exploded Parts diagrams
idealvac dot com/downloads/ex…oded_Views.pdf
ajvs dot com/technical_librar…ath=0_34&man=7
That is that, and in my next post I have some pump rebuild questions of my own. As I am new to the group here, I am not sure if I should have created a new thread for this. Furthermore, I would like to start a few new threads to introduce myself, describe my goals and current equipment and overall situation. Hope this helps when it comes to pumps; in my experience they are all generally the same, at least within the manufacturer and especially series. Some mfgs have very simple rebulid kits and few parts, and others have way more o-rings and little parts. I would say the Edwards series E2 rotary vane pumps and middle of the road with quit a few o rings; I may show some of my other pumps if there is interest.