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The compressor doesn't build up any pressure. I've looked for leaks but cannot find any. model 921.153101 125 psi 3 galoon

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AIR FILTER TOTALLY CLOGGED. BROKEN PISTON ROD. MORE LIKELY IT HAS BAD VALVES. BROKEN AND NOT CLOSING ALL THE WAY. PROBABLY HAS A VALVE PLATE UNDER THE HEAD THAT CAN BE REBUILT OR REPLACED. HOPE THIS HELPS. JODY

Posted on Jun 29, 2009

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Posted on Jan 02, 2017

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Hello I have a 20 gallon kobalt model 033204. I just replase pressure switch but does same thing. When I tur on the compressor jus build 50 psi and shuts off.


This usually occurs when the motors internal thermal / amp breaker opens due to overload or weak breaker. Use an amp gauge to test for too much amp draw. If amp draw is normal, then problem could be the in-tank check valve leaking pressure back to the pump overloading the system, or weak capacitor or weak breaker. Bypass the breaker temporarily if the amp draw is normal to test system. Good luck

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I own a Campbell Hausfeld model WL650800AJ compressor, the problem is that the compressor will not pressurize over about 85 psi..where would be the best place to start troubleshooting?..BTW, there is


The usual problem with oil-less type compressor is the Teflon compression ring and cylinder will fail causing the problem that you describe. Easy to check. With cover removed, turn the pump until the piston is all the way up. With good light, check the condition of the cylinder near the top. If the cylinder looks scratched, air is leaking past cylinder and ring and pressure will not build up enough to reach cut-out. If cylinder looks smooth, then problem is head valve reeds or head gaskets. Indication of bad reeds or head gasket blown, is extremely hot head during fill cycle. Good luck

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1 Answer

Charge air pro model ir330e20 builds pressure to only 60 psi and will not stop running


Cbillgreene:

Your compressor is leaking air somewhere between the compressor head and the tank. With the compressor running, feel carefully around the ends of the tube that leads from the compressor head to the air tank. You will probably feel some air leaking around one end or the other. If so... remove the tube and find out which packing has failed.

Mar 09, 2013 | Craftsman Air Tools & Compressors

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My four-year old PC pancake compressor starts fine but only builds up 60 psi no matter how I adjust the pressure regulator. The compressor motor runs continuously. I checked for air leaks and can't find...


First take off the head on the air pump and check the reed valves on the valve plate. If they got hot and warped or cracked they'll work to a point then no more pressure can be built up. Next check the pistion ring and cylinder wall. If either is damaged you'll only get so much pressure build-up then it will leak past the piston.

Mar 07, 2011 | Porter Cable C2002 150 Psi 6 Gal...

1 Answer

My compressor will not go over 20 psi i have a craftsman 921 4 gal 125 psi compressor and it will not build past 20 psi i do not know how to get to the pistons and stuff what do i do?


The problem with compressors not building pressure is usually a bad pressure switch or bad regulator. Does the motor shut off at 20psi or does it continue running and not build pressure? If the motor continues to run with no increase in pressure, the you should go over the machine looking for air leaks from your regulator back all the way to the motor. Any air leak while the compressor is running can cause the pressure to "peak" way before the intended shutoff that it is regulated to.

Mar 01, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

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

Nov 13, 2010 | Craftsman 15 gal Air Compressor 3 hp UMC...

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Pressure in the tank only builds to 30 psi


Bad check valve. But I would check the regulator, by turning it down to about 10 PSI and running it and see if it builds again, if that works then it is the check valve. But from what you are saying I would replace the check valve anyways.

Jun 05, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Pressure is not building up past 25 psi


ONLY TWO THINGS CAUSE THIS, A DEFECTIVE PRESSURE CONTROL VALVE OR A WORN OUT COMPRESSOR, THIS ASSUMES YOU HAVE NO LEAKS.

Aug 04, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Will not build up pressure


If this compressor is dry type with no oil needed, then it may have a worn cylinder and/or piston ring. With flashlight in hand, look under cylinder with piston in upper most position. If you see scratches most likely it needs cylinder / piston kit. Not to worry, not too expensive. If you compressor has a crankcase with oil, then you may have problems with valves in the head. Cracked or dirt under headvalves will prevent pressure from building. Finally there may be one or several leaks in the tubing, check leaks with soapy water. enjoy

Nov 27, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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