Compressor set up?

Hey guys I have had a Devilbiss Pro 4000 compressor 60 gallon made by Ingersol Rand. I don't think the motor is the orignal but I could be wrong.

I was wonder if anyone knows how to adjust it? There is a spring in the 2nd and 3rd pics that I was told adjusts it but I am not sure. Anyone have one of these or similar? I bought for $200 about 3 or so years ago guy I bought it from closed up his shop and he only used for the tire machine. It works GREAT but kicks on to quick. Like I said I remember saying something about it being adjusted by the spring but I don't want to start adjusting things and screwing it up unless I know for sure.

Author: admin