Testing Rotary Vane Vacuum Pump - How to?

Old 01-25-18, 07:01 AM
Thread Starter
Join Date: Apr 2017
Posts: 15
Upvotes: 0
Received 0 Upvotes on 0 Posts
Testing Rotary Vane Vacuum Pump - How to?


Is there a way to test a rotary vane vacuum pump without buying n expensive tester?

I just bought a cheap rotary vane pump for a cow milking machine. It briefly worked yesterday but not now. I'm not sure if it's part of the milk machine or the pump.

Any help would be great. Thanks

Last edited by jimmyshutter; 01-25-18 at 08:28 AM.
Old 01-25-18, 08:12 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 62,022
Received 3,409 Upvotes on 3,059 Posts
All it would take is a basic automotive vacuum tester. Many are called vacuum and fuel pressure testers. Most measure down to 30 in/Hg. Your vacuum pump should probably be around 20-25 in/Hg.

This one is from harbor freight but any automotive parts store will have them.
harbor freight/fuel-pump-and-vacuum-tester
Old 01-26-18, 05:08 AM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 25,930
Received 1,756 Upvotes on 1,569 Posts
Rotary vane pumps are equally good at generating a vacuum as they are at creating pressure. A real simple test is to put your finger over the outlet or inlet and feel the suction or air blowing out. Rotary vane pumps have fragile solid carbon parts inside. If the pump were dropped or if it was run without a filter on the inlet a piece of debris can get sucked inside breaking the carbon vanes.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: