Question about Porter Cable Cable 4.5 Gallons 150PSI Job Boss Oil - Free Mobile Air Compressor - C3151

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Compressor runs but won't get past 70 pounds of pressure

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The check valve is by passing on the compressor and tank you can replace it to fix the problem it will be between the tank and the compressor. line to the tank. remove and replace or lightly sand with fine sand paper wet or dry 1000 grit. Clean and put back together. If you have your owwners manuel it will show a picture of it.

Posted on Sep 30, 2009

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Posted on Jan 02, 2017

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SOURCE: The compressor runs but the

You have either a broken reed valve on the valve plate or a broken piston ring and/or badly scored cylinder. To check: remove the head on the air pump, the valve plate is directly under the head. The reeds have to be in good condition, no breaks, cracks or bending, to work properly. If they are OK, check the cylinder, it should be very smooth. You will have to remove the piston to check the ring around it. They have a tendency to dry out and sometimes a small section will flip over backwards and will no longer seal the piston enough to compress the air. You'll have to contact Sears to see if parts are still available for this compressor.

Posted on Feb 11, 2011

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