Too much precharge in the tank. The tank is empty when the water pressure drops to 62 lbs. The sudden drop from 62 to 40 psi happens because all the water has been pushed out of the tank.
It's best to precharge the tank when it's empty. But you can try letting a little air out at a time; you should see the point where the tank runs out of water to occur at a lower pressure each time you let air out of the bladder. Repeat until it gets down to 40 psi. Then adjust your switch until you get your desired 40/60 cut-in/cut-out pressures.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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