My water pump builds up to 61 psi but won't shut off. Is it the pressure switch?

I have a submersible pump set to cut in at 20 psi and cut out at 40psi. Recently something happened and I cannot get the pressure above 20 psi and thus the pumps stays 'on' all the time unless I turn off the circuit breaker. The pump has no trouble to get the pressure to 20 psi.What can I do?

Cleaned out crud from hi/low pressure switch bladder is @ 39 psi pump runs (yes it is primed) but willnot go over 15 psi

I have a point with a jet pump. Cut in 40 psi - cut out 60 psi. Recently the psi drops to zero psi then kicks on a minute later. It goes up to 60 psi then turns off. Then when you use water it drops slowly to 40 psi then plummets to zero. What's up?

Hello everyone- I have a 2" 3 year old well pipe that was never used. I have finally hooked up a 1hp above ground pump to it and it pumps water great. I have a 30 gallon bladder tank and a water softner hooked up to it as well. Question: Pump came set at 30-50 psi in and out so I filled...