Help a couple of lady farmers with wellpump problem

[SPYDERLK]

We bought this place ten years ago. The well pump (1/2 HP shallow well) was included, the tank was replaced by previous owner at time of sale. The electrical pressure gauge was replaced by our electritian earlier this year. It's not unusual for the pump to blow the breaker if we use water in the house and barn at the same time.
Yesterday the pump blew the breaker twice in an hour when we weren't using the water. We went down to reset it and as we watched the pressure gauge needle jump up and down as the pressure built up.
Is this an eletrical problem or pump mechanical problem (or pressure tank)?
Thanks in advance for helping, I sure I knew about all these things.
PS should we be doing maintenance on our well pump?

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I think its going to turn out that your pressure tank is waterlogged - - Full up with water and almost no air. You can check this by taking a hose over near the pump and observing whether the pump comes on immediately when you run the hose and stops immediately when you stop.

A waterlogged tank can cause the pump to chatter when the pressure drops to the pressure switch cut on point from some slow leakage without water actually running. The pressure switch starts the pump and pressure immediately rises to the cutoff point because theres nowhere for the water to go. The pressure switch then cuts the pump off, but before the foot valve can seat a little water leaks back into the well - enough to lower the pressure and start the pump again. This can repeat and continue - a "chatter"which can easily trip a breaker.