Porter Cable

Porter cable pancake compressor builds pressure until it blows pressure relief valve.?

If I stop the compressor at desired pressure it works fine but it wont restart on its own to stay in the desired pressure range. This gets very frustrating on any extended project. Anyone know the fix and is it easy?

You need a new pressure switch. The relief valve is working as it should otherwise your compressor would pump until it blew a line or the tank.
Your compressor pressure switch tells the motor when to shut off as the desired pressure is reached.
You need to find the model and type number on the compressor. Then call or go online to www. DeWALT.com. as DeWalt now owns Porter Cable and provides all parts for Porter Cable.
Or call the closest authorized repair center if you want to have it repaired by them.
Compressors tanks often become laden with water as some owners never drain the tanks. This can cause rusty,dirty buildup in the tank - which gets distributed into the metal air tubing and yes sometimes up into the pressure gauges and pressure switch, this can block the pressure switch part that senses pressure by blocking it up. Thus your pressure switch has no pressure being sensed so it tells the motor to keep running. Once you manually shut off the pump - it will not re-start because there is *head pressure* (too much pressure against the motor) to allow the motor to start up, until you pull pressure relief ring to let pressure off.

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