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We have an I/R SSR-EP25SE compressor and recently the belts rolled over and the unit blew cooling fluid out of the air filter so we replaced the filter and today I replaced a check valve because the spring was broken in the old one. Then we set the fluid level to the top 1/2 of the sight window. Now I turn it on and can't get it to pressurize the storage tank. It's as though there isn't enough volume coming out of the unit. When I isolate the compressor from the tank it will build to 108 psi and unload. I'm not very knowledgable on the subject and need some guidence from someone who is.

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Your cutout valve must be faulty, the Valve that allows air INTO the tank, isn't working, or is faulty, and isn't allowing full pressure to be delivered.
A compressor is a pump. When that pump is being driven by the electric motor, it pulls in free air from the atmosphere and drives it into the tank.
Different styles of air compressors do this in different ways, yet they pretty much all do the same thing.When your compressor is running and the pressure in the tank isn't rising, this is pretty aggravating. What the heck is wrong when the compressor pressure will not build?
On this page immediately below is a form that you can use to ask a question about what to do when your compressor will not build pressure?
To see existing comments and questions already posted about this subject please scroll to the bottom of this page (below the form).
I've just added a page that summarizes many of the answers about why a compressor won't build pressure. That page is right here.
Here is another new page that addresses the reed valve issue, to help you better understand how compressor reed valves contribute to why compressors don't build air pressure.
If these new pages or the comments at the bottom of this page don't provide the answer for you, just fill in the form and we'll see if we can help.
And, if you've got a suggestion about solving the "compressor will not build pressure" problem, also please use the form to let us all know about it, and perhaps help someone else.

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Posted on May 11, 2010

  • steve853 May 11, 2010

    Thanks for the info.

    The valve that supplies the tank is manual and is working properly. What would be the next logical thing to look at?



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