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Robbie 02-17-2009 07:44 AM

help with porter cable air comp??
I have a porter cable jetstream air comp, #C P F 4515
(4.5 hp 135 psi 15 gallon 120v 15 amp)
The problem im having is
It use to build up to 120psi before shutting off..but now it hardly builds up to 60 psi,and stays running untill i unplug it.It will build past 60psi if i let it run for a while,but even then it will only be around 65 psi.. I have checked for air leaks and cant find nothing leaking.any help would be great.

302 Z28 02-17-2009 09:50 AM

Bad reed valves or piston rings.


oldred 02-17-2009 10:01 AM

I agree most likely valves leaking or broken, really common problem.

Robbie 02-17-2009 10:04 AM

is this easy to fix??

oldred 02-17-2009 10:36 AM

If it is simple reed valves and if you can find the valves (Tractor Supply keeps some reed valves) then it should not be hard to fix. Be warned however these compressors are generally considered to be of the "throw-away" variety and if the valves are not one of the common types they may be hard to find, any parts for this thing may be hard to come by. First MAKE ABSOLUTELY SURE!!! there is no pressure left in the tank and then remove the head from the pump, the valves should be thin flat flaps looking kind of like a feeler gauge and should be simple to replace if you can find the new ones. Take the head off and let us know what you find, a pic might help.

Make SURE there is no pressure left in that tank before starting to work on this thing because even a small compressor like that can hurt you if you disassemble certain parts with pressure on them.

930dreamer 02-17-2009 11:56 AM

Try this site, there's a type 0,1,2 for your model. Shawn

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