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I have a 98 smith 100cfm pull behind compressor .it runs good just used it. Yesterday started it up oil presurevolts good it shows 120psi on air gauge but when i open ballvalve forair nothing comes out switch is in run position seems like it does not rev up. When i pull pressure relief valve open compressor does rev up i am not getting any air

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  • 381 Answers

Sounds like something is stuck or clogged.
Be careful because you are working with pressure.

Posted on Oct 24, 2017


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: air compressor 3 gallon

I had mine do the same thing... The head gasket blew out between the intake & discharge side.
I went to O'rileys and bought the blue gasket paper and cut out a new one ($3.00) works fine now.
Just take off the plastic cover, undo the discharge line at the compressor head, remove 4 allen
head bolts, lift off cylinder head and you'll see the gasket gone at the center bridge.
Draw a picture of the way the valve plate under the head is assembled so it goes back together right.
Use care cleaning the old gasket off, NO power tools....Hand wire brush to preserve the little ridges
that bite into the gasket, Soak with solvent helps..You can also order the gasket kit from Sears
about $12.00...Hope this helps ya......John

Posted on Oct 31, 2008

  • 1400 Answers

SOURCE: Craftsman 25 gallon compressor wont cut off

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

  • 140 Answers

SOURCE: Air Compressor won't go over 35PSI

Hello, Your air compressor is leaking in the cylinder and is unable to produce more than the 35psi. Unfortunately oilless air compressors do not last very long. The rings and cylinders wear out. I have successfully repaired some units but, I usually recommend buying the oil type compressor. They last forever. If you want to try and repair it let me know and I'll help you. Good luck.

Posted on Jan 22, 2009

  • 205 Answers

SOURCE: air compressor fills, but slows down as the pressure builds

sounds like you need a new check valve which should be somewhere between the compressor outlet piping,tubing,etc and the tank which prevents the air in tank to back feed to the compressor which would cause hard starting and could damage the motor easy way to check is when you shut off the compressor with some air in the tank if the check valve is bad it would continue to bleed air out out the unloader valve .the unloader valve on your unit is most likely part of the pressure switch when the unit shuts of it should only bleed down the pressure in the pump so it would make it easy to start when needed hope i didn't confuse you

Posted on Mar 23, 2009

SOURCE: The compressor relief valve keeps popping, compressor runs

What pressure is it popping off at? You might have to adjust the pressure switch to a lower setting.

Posted on Apr 01, 2009

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