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Craftsman 25 gallon compressor wont cut off

I got a 25 gallon compressor (oil less unit) it runs fine builds up pressure but it will keep building up pressure in the auto mode and will not cut off unless I turn it off or the relief valve blows the excess pressure. Need help whats needed to fix problem

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  • dwashington7 Dec 16, 2008

    ok pressure switch was toast now i got a new pressure switch from grainger just like one on compressor. now wiring on the (sears) pressure switch has line positive and negative terminals and also a motor positive and negative terminals, there is also a ground. the new switch is labled different there are T1 & T2 terminals and then there are L1 and L2 terminals does anyone have any idea how this is wired? do i connect line pos & neg to L1 & L2 and motor pos & neg to T1 & T2 or what?

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The pressure switch has snap action contacts that are opened by a diaphragm pushing against a spring mechanism. Unplug the compressor and remove the cover to the switch and look for the contacts. Make sure that they are not welded together from use. Move the on/off lever to see if they open and close. You may have welded contacts or broken mechanism within switch. A factory replacement is expensive, however if you are a tinker-er you can use a lower price generic pressure switch available on ebay. Switches are sold by pressure range, you need a 120#. Fittings may need tweaking. Enjoy

Posted on Dec 12, 2008

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Posted on Jan 02, 2017

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