The cut-in is preset internally to the governor, something like 15 psi under the cut-out. All you need is a flat screwdriver and a good small crescent wrench. Once you find the air governor there is usually a rubber plug on the one end, it sticks onto the adjuster screw. Hold the screw with the screwdriver, stick the crescent on the jam nut and break it loose, turn the screw til you have it where you want it, tighten the jam nut back down. Which way is which as far as higher vs lower cut-out I don't know, I had to adjust a brand new air gov once, the jam nut wasn't tight, and about 500 miles down the road I noticed it was pushing 140PSI. But it seems to me that extra 20 psi was something like 1/4 to 3/8 or a turn of the screw.
As for checking your gauges, look around your truck for a misplaced valve stem. If you find one, check it with a known accurate air gauge.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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