build pressure wont stop running

have a 5.5 30 gal compresser craftman and it build up to 80 psi and stay running and when you use it it will run the air out and take a good while to build bsck up again


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Bill says...

You aren't alone, chum.

Unless the pressure in the tank reaches the cut out pressure, your compressor will keep on running until something wears out!

Please have a read of "compressor will not build pressure" linked from the TROUBLESHOOTING page. A bunch of things there you can check.

Cheers,

Bill

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craftsman twin cylinder run till it gets to 50 psi

by Emory
(calif)

run till it gets to 50 psi and gets sluges then stops and the motor hummms with a open hose on it it will run for ever ....don't know done all i know.

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Bill says...

Your compressor is responding to increasing load. As the tank pressure grows, the compressor has to work harder to push more air into the tank against that increasing pressure. This is normal, and the compressor is designed to handle the increasing load... unless, as in your case, something is going wrong.

Your description suggests to me that you either has a change in the power supply to the air compressor (more appliances pulling power from the same circuit at the same time), you are using a too-small extension cord, or, more likely, your run capacitor or motor is failing.

A load test the them both at an electric motor rebuild shop might be in order.

Cheers,

Bill

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my craftman compressor will not built over 90 psi it is a 60 gallon

by barbara millsaps
(friendsville tn 37737)

my craftman compressor will not built over 90 psi it is a 60 gallon

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Bill says...

Hello Barbara. There is a page linked from this one on which I have listed the common reasons why any air pressure will not build pressure.

I need a bit of feedback on what you've done, based on the list, to try and identify the problem.

I can tell you that it is common for an intake valve to leak (air puffs out of the intake port instead of only being drawn in) or an internal gasket to fail, both of which will require a tear down of your compressor to further diagnose the problem.

Cheers,

Bill

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