Question about Porter Cable Cable 135 PSI, 15 Gal. Oil - Free Horizontal Compressor CPF4515

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My compressor will pump anymore than 35 pounds. I have put in a new piston kit. What is wrong

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Does the motor continue to cycle?
Is the air bleed valve completely closed?
Is the regulator knob adjusted to the highest pressure?
What are the tank readings vs. the regulated pressure readings?

Hope this helps.

Posted on Jul 08, 2010

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Posted on Jan 02, 2017

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Compressor goes to 35 psi wont fill anymore


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Another thing to check is if it has a one way check valve that goes into the tank where the pump line/hose feeds from the compressor pump into the tank. Many of the check valves use a simple plastic cup and a spring. If they get stuck open then that will also make it not build up pressure.

The other part I can think of is the control box but usually when they fail they either won't turn on the unit or they will leak air.

The last thing to check would be the piston ring(s) and cylinder/sleeve. The oil less compressors will wear these items out far more often then an oil style will. When the oil less piston and sleeve get scored up (from dirt ingestion) then they also will not build up much pressure.

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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.

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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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