Question about Ingersoll Rand Stationary Air Cooled Rotary Screw Compressor 10 Hp, 35 Cfm At 125 Psi, Model# Ep

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I have a ssr ep-15 compressor. It turns on but does not cycle to high pressure. It doesn't seem to have any leaks. all the contactors pull in . pressure switch works. can something be wrong with the intake valve?

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  • Samuel Charles Spriggs Mar 31, 2011

    How old is it ? How many hours has it run ?


  • atthomp Mar 31, 2011

    9 yrs old. about 38,000 hours on it

  • atthomp Apr 01, 2011

    this is a rotary screw compressor - no pistons

  • atthomp Apr 01, 2011

    no I don't believe it is. In the oil tank their is a air/oil seperator, and it mists oil into the recip. screw.



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I would say it's the piston ring(s) or vlave(s) or both leaking by -- in that case it would need a rebuild.


Posted on Mar 31, 2011

  • 2 more comments 
  • atthomp Apr 01, 2011

    This is a rotary screw compressor no pistons.

  • Samuel Charles Spriggs Apr 01, 2011

    Is it the oil-flooded type ?


  • Samuel Charles Spriggs Apr 02, 2011

    I think it may be the "oil-flooded" type rotary screw compressor -- the screws are misted with oil for sealing & cooling -- in that event, I doubt the screws are worn or the compressor is leaking by.

    So, I would say you could be correct that it is a problem with intake. Viewing the schematic, there is a filter on the intake which could be restricting the air intake, but I assume you have checked that. Given the filter is not clogged, the next suspect would be the valve itself.

    I would suggest cleaning the intake valve, it may be sticking. It's probably best to remove the valve to clean it -- WD-40 would be a good choice for cleaning, but it'd be a good idea to not have the valve dripping with it when you try the compressor again -- removing it to clean would allow you to minimize the amount of WD-40 getting into the system.

    That's my best guess at the moment -- which is pretty much the same as yours.

    Please let me know if you try this and how it works.


  • Samuel Charles Spriggs Apr 06, 2011

    Thanks fpr the rating -- I appreciate it !




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Posted on Jan 02, 2017

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SOURCE: I have a Ingersoll rand

Start with the simple things first... had a fellow a couple of montha ago that did not realize that there is an air filter....cleaned that and the air compressor worked great a again....
So... check your air filter...
Also does that model have oil in the crankcase??? is so check that you are part way up in the site glass with oil...if the unit has been used heavily, has the oil every been drained and changed???
This could contribute to rings getting sticky and hanging up...
If none of these things work then start going deeper into things...


Posted on Mar 31, 2011

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