Troubleshooting vacuum pump

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GuzZzt

Member
Joined
Nov 28, 2015
Messages
6
Location
Gothenburg, Sweden
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?
 

duncsuss

Well-Known Member
Joined
Jun 29, 2012
Messages
1,338
Location
Wilmington, MA
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.
 

Gary Beasley

Well-Known Member
Joined
Sep 18, 2009
Messages
1,038
Location
Marietta, Ga. USA
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.
 
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