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Porter Cable C2002 150 Psi 6 Gal Compressor. The compressor will come up to about 148 psi and then when it shuts off drop to around 125 psi and stabilize there. I can never get it to hold 150 psi.
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The attached link provides a work around,
There are repair kits available. Dissemble and make sure that you document the assembly for reassembly. Common problem.
The maximum pressure on most small compressors is 10 bar or 1000kpa which is about 145 psi in the old language most safety valves are set to 150 psi. I suggest you get some one to reduce the pressure switch setting. Running a compressor at elevated pressures does not give you any more air. A reasonable pressure for small compressors is 120 psi
If it is building up to the full rated pressure and there are no air leaks in the hoses then it is most likely the pressure switch. It is item 111 in this parts diagram.
They will let air out if you have turned the valve out too far, try turning it clockwise until it stops then open it by turning the other direction two or three full turns.
Look for massive air leaks all around the machine including the safety 'blow-off' valve. The compressor diaphragm may have a hole in it. If this machine is new, return it to the dealer and get your money back or at least get it repaired under warranty. Good luck!
Does the compressor continue to run but not build more pressure? In which case it is an air leak most likely, or does the compressor shut off at 50 PSI? In which case it is mose likely the pressure switch. If it is an air leak you can un-screw the guage and coat with putty or teflon tape and reinstall to clog the leak around the threads..
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