Question about Craftsman eVolv 3 Gallon Oil-Free Compressor

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My evolv 3 gal. air compressor check valve kicks out at about 80 lbs of pressure and drops pressure to about 60lbs and runs continuously, it never fills and shuts itself off before the check valve kicks in and drops pressure.

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Posted on Jan 02, 2017

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  • 1388 Answers

SOURCE: compressor will not pressurize

A simple check to see of the compressor is pumping is to remove the intake air filter and feel for suction. If the pump is working properly you will feel suction at the intake and the compressor will unload (speed up) when you restrict the opening. If no suction remove the head and valve plate and check the piston and reed valves for damage. Replace parts as needed. Parts are not expensive for small compressors. Good luck, enjoy.

Posted on Dec 21, 2008

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  • 5 Answers

SOURCE: my sears 2hp 15 gal compressor runs but pressure wont exceed 60lb

compresors pump, valvs or sels gon!

Posted on Jul 15, 2009

protek480
  • 1714 Answers

SOURCE: compressor not building pressure and continues to run

Unplug it and listen for air leak. What pressure does the manual tell you it should run to? The safety release could be bleeding air, listen for that, with it off. Make sure it is designed for more than 60 PSI by manufacture.

Posted on Jul 20, 2009

  • 50 Answers

SOURCE: Craftsman 3 gal., 1.5 hp air compressor: won't

The compressor will not auto shut off until it reaches the preset pressure which is usually around 100-130 psi - your problem is leakage of air from the oil filler cap suggesting that you have a failed internal valve.

Posted on Sep 24, 2009

  • 1388 Answers

SOURCE: I have a Sears evolv 3 gal air compressor that

The evolv air compressor was primarily designed to power a very small nailer. The pressure regulator (knob in front) should be turned clockwise till it stops to attain full pressure. At this setting it should air your tire. If not you may have a defective regulator. There is a trick to get full pressure from your tank. Notice the small pressure safety valve on the side of the unit. You could remove this valve and install a fitting giving you two ports. One for the safety and other for a quick disconnect. This second port will give you access to tank pressure without going thru the pressure regulator. This mod is safe because you still have access to regulated pressure when you need it. Good luck

Posted on Jul 08, 2010

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I have a 5 gal, i hp craftsmen compressor, 3 years old, used once a year to blow down sprinkler system. Compressor ran up to 120 lbs upon turn on, would not cycle off. manually shut off unit and turned...


Oil free pumps do tend to blow the piston ring (not too expensive) available at searsparts.com. Remove covers to pump and manually turn crank until piston is at top and look at the condition of the cylinder neer top, If it looks scratched, order cylinder kit with piston ring. If it looks good and shiney, could be the valve plate in the head. There are reed valves that tend to break. Run pump however with covers removed and check with soapy water for air leaks and repair as needed (air leaks under the cover will prevent unit from filling). Good luck

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I have a Sears evolv 3 gal air compressor that will not inflate a auto tire, even a partially de-flated tire. I let the pressure build to 100 psi and checked all fittings. Still wil not do it. Compressor...


The evolv air compressor was primarily designed to power a very small nailer. The pressure regulator (knob in front) should be turned clockwise till it stops to attain full pressure. At this setting it should air your tire. If not you may have a defective regulator. There is a trick to get full pressure from your tank. Notice the small pressure safety valve on the side of the unit. You could remove this valve and install a fitting giving you two ports. One for the safety and other for a quick disconnect. This second port will give you access to tank pressure without going thru the pressure regulator. This mod is safe because you still have access to regulated pressure when you need it. Good luck

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Are you sure the gauge is relaible??

If so then a valve in the compressor is allowing leakage.

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Compressor not building pressure and continues to run


Unplug it and listen for air leak. What pressure does the manual tell you it should run to? The safety release could be bleeding air, listen for that, with it off. Make sure it is designed for more than 60 PSI by manufacture.

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1 Answer

Compressor will not pressurize


A simple check to see of the compressor is pumping is to remove the intake air filter and feel for suction. If the pump is working properly you will feel suction at the intake and the compressor will unload (speed up) when you restrict the opening. If no suction remove the head and valve plate and check the piston and reed valves for damage. Replace parts as needed. Parts are not expensive for small compressors. Good luck, enjoy.

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