Instructions to properly adjust the air pressure on your air compressor purchased from Harbor Freight. This is my video demonstration for a visual understanding of what to do. Nearly all pressure switches are similar and this also works on water pumps for your house, irrigation pumps and some other applications on the farm. I learned how to do this when I was employed as a diesel mechanic on a large farm.

This demonstration was on a 21 gallon Central Pneumatic air compressor, other models (US General) sold by Harbor Freight will have a similar pressure switch.

Disclaimer:
Be aware that you are dealing with live electricity and the air tank is a large accumulator that can discharge air if you turn this up too much. * This video is for information only and you are responsible to work safely. We are not responsible for any incidental damages as a result of using this information.

Never exceed the specifications set by the manufacturer of your equipment, it may become unsafe resulting in personal injury and or damage to the equipment.