I wouldn't remove the motor. But what is possible is to re-install the pump with 2 unions, and replace the electrical to the pump with a locking cord, using something like this:
L6-30 Extension Cord, 20 Foot - NEMA L6-30 Plug to L6-30 Connector, 30 Amps, 250VYou'd have to cut the cord, and put the female end into the box, and attach the male end to the pump, using the strain relief connectors at both ends. You'd need to make sure that water didn't drip all over the plug & socket set. You'd also need to solder the wire ends, especially on the motor connections. Fine stranded wire will not maintain a good connection under those terminals, with all the vibration and such.
Arlington LPCG50-1 Low-Profile Strain Relief Cord Connector, 1/2 Inch
American Terminal AT-31604 60-40 Rosin Core Solder
But, with the unions and the cord set, you could simply disconnect the entire pump and store it indoors.
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