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Old 06-11-2018, 04:41 PM   #1 (permalink)
GuzZzt's Avatar
Join Date: Nov 2015
Location: Gothenburg, Sweden
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Default Troubleshooting vacuum pump

I bought a vacuum pump (2 Stage, 2.5CFM, 12/3 HP, 3x10-3 Pa) that I have connected to a 12l chamber. I get a vacuum around 27" Hg but not better than that. I expected it to get closer to 29". I can see some bubbles in the oil window on the pump, not sure how to get rid of that. I have tried twice to change the oil but it only slightly improve. How can I troubleshoot this?
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Old 06-11-2018, 05:59 PM   #2 (permalink)
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Join Date: Jun 2012
Location: Wilmington, MA
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I have a T-junction on my pump with a gauge right there and a valve (to which I connect the hose). It lets me measure the vacuum the pump is pulling without anything else connected.
Duncan Suss
website: FruitOfTheLathe | facebook: FruitOfTheLathe

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Old 06-11-2018, 08:31 PM   #3 (permalink)
Join Date: Sep 2009
Location: Marietta, Ga. USA
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The seal on the tank should be thoroughly checked, expect too such a large tank may take a while to stabilize at max vacuum. Also you might want to check the accuracy of your vacuum gauge, it may be off.

Stabilized blanks and more
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