a couple of years ago the shaft that comes thru the fan snapped in two but did not damage anything else.
The Shaft on mine snapped where it was milled down to a smaller size, notice the rusty part on yours is milled down to a smaller size. We have an ex machine shop owner working with us and he said the shaft is milled wrong and ones like that snap a lot, yours doesn't look broke, but if someone else had theirs break that's why.
You have to tear a lot apart to get everything out, but except for a snap ring tool the rest are common wrenches and sockets.
Remember to have dictionary nearby so you can access the proper 4 letter words.