I am not certain of your particular unit, but generically, I can tell you that compressors have regulators, and unless yours is really inexpensive, those regulators should have an adjustment knob for air pressure.
SOURCE: Craftsman 30 Gal. 150 PSI Not building air over 45lbs
The compressor valve may have a faulty gasket or seal, and maybe leaking air internally. Or the compressor might be going downhill. You can try to replace the valve seal and see if that makes a difference, otherwise you need to replace the compressor.
SOURCE: Air compressor won't go over 40 psi?
my ace air compressor which is 26 gallon 5 hp will not get over 60psi what is wrong with it please?
SOURCE: Can not build working pressure pressure......
The most likely problem is a burned out "run capacitor" on the motor. If you continue to try to run your compressor in this condition it will burn out the "starting capacitor" and/or motor as well.
It's also possible that you have a bad start up pressure relief valve, this valve will be between the compressor and the tank. If this valve is working properly you should hear a hiss of air as the compressor motor shuts off.
A reasonable motor repair shop should be able to replace the run capacitor for $20-$50 plus inflation, depending on your area.
If you need to test the start up pressure relief valve, you need to take it loose at the compressor or tank. Just loosening the line may not work depending on the style used. Note: sometimes just taking this loose to test it causes you to have to replace the valve.
SOURCE: the compressor reaches 40 psi and won't build
Hi, my name is John. Welcome to FixYa. There has got to be a leak, check the line coming from the pump to the tank, you may have to remove it to check. I find this is often over looked. Thanks for choosing FixYa...John
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