Question about Goulds Pumps Goulds J7S Single Nose Shallow Well Jet Pump, 3/4HP

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Our power was out for about 5 hours in -30 degrees C. the next day our water ran out- the pump was running dry and hot so we shut everything down. Thinking that the lines were frozen we poured hot water and salt down the pipe lines sucked it out and repeated. It took us while to keep the pump primed but then when we finally got it going the pressure stayed at 40psi and the primer casing bolt got really hot so once again we shut it down. Any suggestions why that top bolt would get so hot??

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