Replacing nut on Frigidaire Electrolux dishwasher

I’m trying to replace this part on my dishwasher: http://www.************************.com/PartDetail/Nut/154106202/1196115

The issue that I’m running into is that the wires that are connected under this nut don’t seem to be able to be disconnected. I’m nervous to yank too hard in case these aren’t meant to be disconnected in this way and I break them. If they can be disconnected but are just tough to pull apart then I’ll keep trying, but I wanted to see if anyone had any suggestions on how to get these pieces apart so I could slip in this new nut.

The picture below shows the part I’m trying to replace circled in green while the pieces I’m trying to disconnect have an arrow pointing at them.