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For what it's worth, I pulled the vacuum pump from my IV at 500 hrs.   I sent the pump to Parker and asked for a detailed teardown and analysis.  The report said that normal wear was noted and that it would have easily gone the full 1000 hours, and why did I pull it ??. Because of all those scary stories of them not going 500 hrs w/out failure.  Heat is their worst enemy, and if a cooling shroud is installed it extends their life along with changing the filter regularly.   Then I remembered that it was my $200 core !!!!  Mike

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Please send your photos and drawings to marvkaye@olsusa.com.