Place an adjustable wrench on top of the nut on the pressure control switch cover. Turn the nut counterclockwise and lift it straight up and off the cover. Pull the cover straight up and off the pressure switch.
Observe a large spring with a nut on top of it and a small spring with a nut on top. The large nut adjusts the both the cut-on and cut-off pressure while maintaining the time gap between them. The small nut adjusts the differential or the time period between cut-on and cut-off.
Turn the small nut clockwise with an adjustable wrench about one turn to raise the cut-off pressure. Open an outdoor faucet on the well so the well pump will start pumping water. Close the faucet after the well starts pumping.
Observe the pressure gauge on the pump to see the reading when the pump cuts on and off. Most residential submersible pumps should have a cut-on pressure of about 30 psi and a cut-off pressure of about 50 psi.
Make further adjustments to correct the short-cycling by turning the differential nut clockwise in small increments up to the cut-off pressure of the pump. Do not adjust the differential to a higher cut-off pressure than the pump is rated for.
Replace the cover and turn the nut on top clockwise with an adjustable wrench to secure it.