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

1 Answer

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

Posted by Anonymous on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 6,826 Answers

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


1 Suggested Answer

  • 2 Answers

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

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Rebuilt piston compressor works fine but only reach 35 pounds seems like tank won't fill motor slows down belt smokes if I disconnect pipe and valve from tanks it runs fine with out issues also ran and...

check for a faulty check valve at the tank inlet end of the pipe
possible blocked from carbon build up
This would account for a piston lockup ( over pressure) causing the belts to slip but to work ok when the pipe is removed

Mar 28, 2015 | Air Tools & Compressors

1 Answer

No power to compressor 2 pounds of Freon compressor, expansion valve, dryer condenser an high pressure switch new.

I would say that with 2 lbs of Freon in the system that the high pressure switch is stopping the compressor from working and being destroyed from liquid on top of the pistons. An ac system works by compressing gas to liquid and then releasing that liquid through a small orifice into a vacuum created by the ac compressor .With excessive liquid then that turning to gas situation will not occur and liquid will get to the pistons and stop the piston movement. I recommend that you take it to a ac specialist and have the system pumped down into a receiver tank and then the correct amount of refrigerant gas added .

May 14, 2014 | 2004 Mitsubishi Galant

2 Answers

I have a craftsman air compressor model number 921.153101 that won't pump-up over 40 pounds

Its probably a oil less compressor so it could be the reed valves are bad or the piston rings are bad.

Feb 01, 2014 | Craftsman Air Tools & Compressors

1 Answer

35 pounds of pressure in air conditioning system but 0 when compressor turned on

Detect refrigerant leakage in the system, repair and recharge the gas

Apr 08, 2013 | 2005 Honda Civic 1.7i

1 Answer

Why can`t my compressor pump over ten pounds ?

You didn't state what model compressor you have so in gerneral: if you have no leaks, remove the air pump head to check the reed valves on the valve plate and the condition of the piston, piston ring(s) and cylinder. If the reed valves are broken or warped from heat they won't seal properly. If the piston ring(s) are broken or the cylinder is badly scored air will leak past the piston instead of compressing and going into the tank.

Oct 23, 2012 | Air Tools & Compressors

1 Answer

Compressor goes to 35 psi wont fill anymore

There are a number of possibilities. The head on the compressor pumps usually uses some type of reed valves to separate the intake and exhaust sides. You can remove the top bolts (usually 4 bolts) that hold the head on and inspect the valve plate(s). Are the reed valves (usually just small metal strips) broken or not seating on their plates. Are the gaskets in fine shape? If you get a tear in the middle of the head or valve plate gasket, where it separates the intake and exhaust, then the pump will only build up pressure to the range you have or sometimes up to only the 50psi range.

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.

Jul 20, 2011 | Craftsman 3 gal. Air Compressor, 1 hp,...

1 Answer

The compressor runs but the pressure will only build to approx twenty pounds and the compressor keeps running. I have used it many times before and had the discharge regulator set to approx 45 pounds, and...

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.

Feb 11, 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 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...

1 Answer

Replacement cylinder has a inside ridge and will

It is possible that the piston MAY have to be inserted from the head side. This means dosconnecting the con-rod.

Oct 23, 2009 | Craftsman Air Tools & Compressors

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,...

Not finding what you are looking for?
Porter Cable Cable 135 PSI, 15 Gal. Oil - Free Horizontal Compressor CPF4515 Logo

152 people viewed this question

Ask a Question

Usually answered in minutes!

Top Porter Cable Air Tools & Compressors Experts

John Trevino

Level 3 Expert

1388 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers


Level 2 Expert

214 Answers

Are you a Porter Cable Air Tool and Compressor Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides