Hi, I have a porter cable air compressor c2006, and bought it used and sometimes the motor is in limbo when it wants to rebuild air supply, so I have to pull the release valve for it to charge properly, what part do I need to replace and is it easily accessible? Thank you if you have any suggestions, it works fine most of the time.

SOURCE: Compressor air leak

hi first we have to find where the leak is comming from ,so you will have to remove the cover,secondly is the leak just from an external fitting?if so then you can see the problem and a simple adjustment or removal to re seal can be done ,if the leak appears to be from the pump head joint then the head will have to be removed and a replacement gasket fitted however i reccomend that if this is done then a new valve set be fitted at the same time
hope this helps ian

SOURCE: I have a porter cable 4.5 gallon 150psi air

That is what the relief valve is set at, you need to
either increase the pressure on the relief valve or
reduce the pressure on the pressure cutout switch. Stephen

SOURCE: operating manual for C2006 Type 4

Sounds like the same problem. My compressor would run and pressurize to 125# but no air out the outlet. Turning the pressure reguator knob did nothing. If this is the same then here is my fix which worked great. Before you start bear in mind a new reg is under $20. Make sure the compressor has no air in it. Remove the regulator. Take a needle nose and remove the plastic insert gently from the bottom and inside of the reg. Take out the pressure spring. You should see a threaded shaft and a "c" clip. If there is no washer on the end then what is taking place is when you turn the knob in for more pressure it simply goes down through the center of the spring and exerts no pressure on the plastic insert which applies pressure to the valve. Thus no pressure. I simply removed the "c" clip, placed a generic washer placed on the end. The hole of the washer should allow it to sit on the end of the threaded end without going down the shaft and center protruding an 1/8" or so. Naturally the washer should easily fit inside the regulator housing. Now slip the "c" clip back on, back it out the knob all the way( don't force) and reassemble. Have no idea what is suppose to be in there from the factory but the problem was when I took mine apart there was nothing pushing on the spring which pushes on the nylon plastic insert which regulates the air at the outlet. Good Luck Bob F.

SOURCE: Porter-Cable compressor C2006 I'm not building any

if there are no leaks piston rings are probably wore out or stuck in compressor