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The bearing needs to be pressed onto the ceramic shaft before inserting the impeller into the housing. Then it just drops in (while trying to hold on to it the best you can to keep it from slamming in.). New bearings didn't come with the new impeller? If not you will have to carefully pry out the old bearing from inside the housing.
Just remove the 4 phillips head screws to remove the housing, then pull the impeller out. When replacing the impeller be sure to have a good grip on it as the magnetic attraction will pull it in pretty hard.
This is from Danner: SERVICE AND MAINTENANCE The housing should occasionally be removed to clean and inspect the impeller assembly. The impeller is the only serviceable item and can be pulled out of the body. If it is worn or broken the entire impeller assembly should be replaced. This will restore the pump to original capacity. Pumps taken out of service for an extended period with fluid inside run the risk of forming a crust which may prevent subsequent starting. Saltwater should be flushed out with fresh water.
IMPORTANT: FOR PUMPS USED IN SALTWATER OR HARDWATER. Magnet impeller assembly must be removed approximately every 3 months for cleaning in white vinegar to remove accumulations of scale or calcium. Disassemble magnet from impeller by pulling them apart (it may take a strong pull). One end cap will come off. To clean the calcium scale off of the shaft and bearing inside the magnet soak in white vinegar for a few hours and scrape it off. Reassemble magnet/impeller assembly. Do not loose (sic) any washers located between end cap and impeller.
I can only imagine that something has jammed the magnet/impeller. take the screws off the volute and remove. Pull out the impeller assembly and inspect for possible source in magnet chamber and impeller housing. That is a very problem free model.
pondmaster 250 comes with a 3 year manufacturer warranty you should just exchange it for a new one. Overheating from low water sounds like the issue but as long as the shaft and housing are not scarred from debris they will replace without any questions