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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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