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  1. #1

    Vacuum pumps/Microns

    Had a system that wouldn't pump down last weekend. In the process of figuring out what was wrong, replaced the pistons/o-rings in my gauges and gaskets on my hoses. Then tried to pump down just the gauges and couldn't get below 3,000microns,then tested gauges against 350psi with leak check solution and found no leaks. Concluded that something in the pump needs rebuilt. Then pumped down gauges with different pump,went down to 200 and slowly climbed back up. Checked my 4 other sets, the same thing. ....any thoughts? and has anybody ever rebuilt their own pump?

  2. #2
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,397
    Manifolds tend to be leaky, that's one reason you shouldn't use them for evacuation.

    Straight hoses to the unit and vacuum rated core removers are the best and fastest way to pull a good vacuum.

  3. #3
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    See if an oil change helps


    Sent from my iPhone using Tapatalk

  4. #4
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,787
    Don't use your gauges as a test to see if the vacuum pump is good.

    Next time hook the micron gauge directly to the pump and blank off other ports and turn on the pump. If it pulls under 50 microns then its good to go.

    X2 on what JP says. manifolds and hoses leak. the best way to evacuate is vacuum rated hoses and core tools. You then can blank off the evac equipment and check microns on only the system.

    There are good threads and pictures floating around with good setups.

  5. #5
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,787
    Also, X2 on what Joe says.

    Pump oil should be drained after each use and filled back up before evacuating.

  6. #6
    Join Date
    Jun 2012
    Location
    nampa idaho
    Posts
    66
    Try putting some nylog on the ends

  7. #7
    Join Date
    May 2007
    Location
    Central NJ Area
    Posts
    788
    Quote Originally Posted by hkempf View Post
    Try putting some nylog on the ends
    I agree with nylog. I put it on all service valve caps that i touch and on my Manifold Connections. Love the stuff compared to that Blue leak lock crap.

  8. #8
    Join Date
    Mar 2012
    Location
    Birmingham Al
    Posts
    153
    where is everyone buying this nylog stuff? my local supply houses think that im crazy.

  9. #9
    Join Date
    May 2007
    Location
    Central NJ Area
    Posts
    788
    i think i've bought it at johnstone or trutechtools.com sells it....

    https://www.trutechtools.com/search....ylog&search=Go

  10. #10
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,397

  11. #11
    Join Date
    Jun 2012
    Location
    nampa idaho
    Posts
    66
    Johnstone

  12. #12
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    everywhere..............
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

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