Turning down air compressor pressure

[Webb Willmott]

I need to adjust the limit switch on pop’s old compressor I now have. Do I increase or decrease the spring tension to lower the cutoff pressure?

 

[hughie]

Decrease, and if you dont have a pressure gauge on the compressor, put one on it'l help with the setting up. I do it on the run, but this aint for everyone

found this
Clockwise rotation of the screw increases the pressure, while a counter-clockwise rotation decreases the pressure. Ensure the compressor is unplugged and the tank is empty before adjusting. Step 7: Turn on the compressor and verify if the compressor motor stops when the pressure reaches the cut-out point.

 

[Webb Willmott]

Thanks. It does have a gauge. My issue was the first time I ran it was after changing to 220v, it kept on running and I was worried about how high it was getting. After a little clean up, I did see the adjustment arrow imprint that was under 50 years of crud.

It’s amazing how much stronger the compressor is after changing the wiring.

Now to get it adjusted just right.

 

[Tim Hunter]

Operating voltage should not have made a difference, and certainly would not require cut-out pressure adjustment.

Tim

 

[Webb Willmott]

Operating voltage should not have made a difference, and certainly would not require cut-out pressure adjustment.

Tim

I agree. Perhaps years of non use may have been an issue. It still needed to be decreased because I don’t need a pressurized bomb in the shop.