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Re: A Bunch of Failures

Posted: Sat Jan 06, 2018 10:30 pm
by Jackson Oswalt
I managed to rig up an adapter. Unfortunately, it takes the inlet down to a 1/4" at one point, so I still plan to replace it do to how much that will bottleneck the pump. The second problem is the oil. The people who sold me the pump weren't quite the brightest and decided to leave the oil in the pump while shipping it despite what I told them. As you would expect, the box arrived on my porch covered in oil. As far as I can tell, all the oil drained out. Would it be okay to use some of my Robinair pump oil with the Edwards pump? It's fresh, but it might not be compatible. As far as it's "type" (such as hydrocarbon), it doesn't say. Here's the link to it: https://www.amazon.com/gp/product/B000X ... UTF8&psc=1.
Thanks!

-JO

Re: A Bunch of Failures

Posted: Sat Jan 06, 2018 10:52 pm
by John Futter
you can get the right ultra grade 19 oil here
http://www.pchemlabs.com/product.asp?pid=1438

Re: A Bunch of Failures

Posted: Sun Jan 07, 2018 2:32 am
by Jackson Oswalt
Not long ago I ran the pump for about 3 minutes and got down to 500 microns (that's with little oil and npt threads). I was shocked at how quiet it is and the pressure it reached quickly. Definitely an upgrade from my HVAC pump.

Re: A Bunch of Failures

Posted: Mon Jan 08, 2018 10:39 am
by Dennis P Brown
While 500 microns is terrible for a good pump, that it had little oil can explain that figure but also, an excellent way to destroy the pump. Always fill the pump to the correct level before operation.

Re: A Bunch of Failures

Posted: Mon Jan 08, 2018 11:25 pm
by Jackson Oswalt
I understand this, but I won't have any proper oil for it for at least another 10 days. I need to get some tests done, so I asked if I could use the robin air oil. I understand it's not the official oil, but it would only be temporary. Does anybody know for a fact it would be acceptable to use the robin air oil? Thanks!

Re: A Bunch of Failures

Posted: Mon Jan 08, 2018 11:41 pm
by Richard Hull
Direct drive oil is direct drive oil and as long as your Robinair oil is fresh from the jug it will suffice until your 19 oil arrives. Try it and see what pressure you hit at the inlet of the pump.

Richard Hull

Re: A Bunch of Failures

Posted: Tue Jan 09, 2018 7:12 am
by ian_krase
There is one difference: Pfeiffer pumps use moderately higher viscosity oil. I doubt it matters.

Re: A Bunch of Failures

Posted: Tue Jan 09, 2018 7:37 am
by Bruce Meagher
I’d worry more about the vapor pressure of the cheap oil and the implications of using it in your newly purchased pump.

Re: A Bunch of Failures

Posted: Tue Jan 09, 2018 11:16 am
by Dennis P Brown
As long as you are prepared to properly clean out the pump - remember, that is no simple task to really remove the wrong oil if its vapor pressure may be a future issue - then fine. The oil will provide the pump lubrication to enable you top test its operation. However, might be easier in the long run to just wait and use the proper oil; certainly less work.

Re: A Bunch of Failures

Posted: Tue Jan 09, 2018 9:12 pm
by Richard Hull
It will pump or it will not pump regardless of oil. This is not a new pump. Remember it was bought from a guy who shipped it with oil in it. Not a real vacuum head who owned it last. No good vacuum head ships a pump full of oil.

Richard Hull