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cleaning and replacing oil in roughing and diffusion pumps


 

How often do you experts clean out and replace the oil in a roughing pump?
How about in a diffusion pump?
We did the Diff pump about 10 years ago, and found all kinds of interesting stuff had fallen into the trap. The roughing pump (a Welch, IIRC) probably hasn't been cleaned out in over 20 years.
Guy

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