Question about Ridgid 17038 4.5 Gallon Oil Free Twinstack Air Compressor

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Have rigid twin stack air compressor. Only keeps about 75 psi and keeps running. I do hear air from the exhaust port (seems normal). Haven't used it for a while. Any ideas? Thanks, in advance.

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  • Steve May 18, 2009

    Forgot to mention my Rigid Air Compressor is a 5 gallon Oiled Compressor. OL 50135 that won't keep more than 75 psi and keeps running. Thanks.

  • Steve May 19, 2009

    Thanks for the help! I'll check it out.

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Possiably the " reed valves under the head are not closeing off all the way. These may be bent or somehow distorted their tension most of the time from exsesive heat. Good luck

Posted on May 19, 2009

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Hitachi Ec 119 compressor will not build pressure beyond 25 pounds; no air is heard leaking after I power down the machine. Is it likely the check valve or pressure switch?


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I have an Ingersoll Rand T30 10 HP compressor that runs OK and will bulid up 150 psi without any problems. But when the pressure drops enough to kick the pressure switch, the motor won't start. just tries...


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That is an extremely high pressure. I would firstly check to make sure that THAT is what you need, then MOST compressors have a regulator where you can adjust the pressure required.
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You stated that the compressor started up fine. I'll assume it reached it's max psi then cut out. Then upon reaching it's cut-in psi the motor ran slowly for a few seconds, then kicked off. I also assume you mean check valve when you refer to the non return valve.
If this sounds about right then. The first thing I would do is bleed out all the air from both the tank and the pump supply line leading from the pump head to the tank's check valve. You can do this by simply loosening the fitting that attaches the line at the head or the check valve. Once done try running the compressor again.
The purpose of this is to check the unloader valve. This valve bleeds off the pressure that remains in the compression cylinder and the supply line up to the check valve. When functioning normaly it will bleed off this pressure once the motor shuts off. If it is not working correctly then when your compressor starts back up (once it is already been filled) the piston will be working against a psi close to the max psi.

If the problem reoccurs only after the compressor has reached it's max psi, then the unloader valve is most likely the problem. If however it will not start up at all even after a complete bleed then it has to be something internal to the pump and\or motor.

Please try this and let me know (or repost) your findings.
If it's the unloader valve I should be able to explain how to repair this valve.
Good luck.

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1 Answer

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Hope that helps and makes sense.

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