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Recommended oil. When finished the rotor should be perfectly clean. Now to clean the vanes. Scrape them clean with a flat object like a small screw driver , using a small needle to get in the fine places. Remember any gunk could make them stick and seize up. There will likely be on the wide sides as well as the small sides so don't skip any area.
Now clean the body of the second stage just like you did with the rotor. This part took me minutes to clean right. Make sure you get all of the ridges and places where the various sections join with each other.
Don't forget to clean your bolts and the piece that goes between stage 1 and 2 and connects the rotors. Now lets move on to the oil pump. Just like stage 2, it has a small rotary vane assembly in the center though in this one the vanes are all one piece with a piece that links this rotary assembly to the previous stage.
Press it out just like before and begin cleaning. Once again scraping and making sure you have cleaned everything all of the holes, grooves etc. This was pretty easy for me, much more easy than stage 2.
Clean and scrape out the cap and back-flow preventer parts. Clean and scrape out the outside body of the pump basically the oil reservoir, including the oil level window.
This took about 1hr for me. It was honestly, quite disgusting. Now that we have cleaned everything to our standards. Time to reassemble the pump. To reassemble first put that metal piece that connects the stage 1 rotor to stage 2. Put the Stage 2 pump body, making sure to align the screw holes.
Screw stage 2 into place. Insert the stage 2 rotor. Insert the vanes the angled corner goes inside and towards the middle. Now this next part gets tricky You need to put the oil pump on but it doesn't have screw to hold it in place. So you have to line up the notches on the oil pump rotor assembly with those on the stage 2 rotor.
Attach the oil pump lining up the screw holes and while holding the oil pump in one hand attach the oil pump cover, lining up the screw holes. Then while still holding all of this with one hand, screw in one of the screws to hold it in place. Screw in the other screw, the pump body is back together. Now reattach the backflow preventer valve.
It goes on like shown. Now reattach the housing that goes on top of the backflow preventer valve. Lastly, reattach the pump body.
Don't forget the gasket that goes in between the two parts. Now we are done. It is time to flush the pump with some oil. Fill the pump with 0. Run it for aroudn 30sec-1min. This should sweep up any free debris. Drain the pump oil and refill again. Run the pump again this time listening for any weird sounds. Check and make sure the pump is pulling a good vacuum and you are finished. All that is left is to clean up your area. Good luck with things and if you have any questions feel free to ask them here.
Excellent write up. Thanks, There is so little info out there, your write up is one of a couple which are very useful to overhauling a vane vacuum pump. The vacuum pump industry would like us to believe intracranial surgery is involved, far from it. I just overhauled an Edwards E2M12 and will post an instructable in the near future.
Thanks again. Reply 8 years ago on Step 2. HAHA, that is a good analogy. The first time I did the brakes on my car I felt similarly intimidated. After I was done I felt exactly the same thinking: "Thats it, what the heck was I nervous about" and I was also similarly dirty. Great write up. Worked very well for RV Definitely just forcing them to spin helps a lot as well.
Question 3 years ago. Hi, I have this kind of pump and the oil makes bubbles and goes up in the outlet. Do you have any suggestion as to why that happens? Thank you. Answer 3 years ago. Hey All. Great write-up. Very helpful. I am just using this now after getting the clean and overhaul kit.
I have a question - if this thread hasn't gone extinct - the rotor is very difficult to turn once I put the 2nd stage on. After the pump portion is assembled and attached to the aluminum adaptor I need to use a wrench to make it turn. This doesn't seem right.
I am going to pull it apart again, make sure everything is lubed but am not sure what to do next. Thanks for any comments. Very helpful writeup, thank you! I will join the chorus on the shrinking intimidation factor. Also there is purpose made flushing oil available, although flushing with regular oil seems to work fine too. A very useful little guide to overhauling a rotary vane vacuum pump.
These exploded diagrams are really useful when reassembling your pump, especially if you forget how everything fits together like when your department catches fire and you can't get back to work for a while. Again, thanks for the help. Just lost all the pics of the Edwards E2M12 overhaul.
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