There should be a brand name and model # on the pressure switch. Should be able to find the info doing a search.
If not, one screw will be the pressure, the other will be the differential.
With the tank pumped up to 90, start turning one in, count the turns so you can put it back. It should come on within 2 turns. If not, put it back and try the other. Once you determine which is the pressure screw and which is the differential, you can fine tune it through a few cycles.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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