I've had this problem in the past with my buddies brute. What we done was spray the shaft with penetrating oil. Then we screwed the nut back on flush with the shaft. I put both of my feet against the floor board and pulled on the secondary pulley with both hands,one on each side while he hit the nut with a hammer. It took awhile but she came off.
I'm sure I don't have to tell you this but...becarful with that hammer. If you had a soft hammer ( brass/plastic) it would be idea to use. Or a block of wood like Polaris mentioned would work to soften the blow.
I have no clue as to why it was stuck like that.Once it was off it would slide back on and off with ease just like its suppose to.
Once you do get it off be sure you clean all the penetrating oil off the shaft and the pulley. Don't want any of that slinging around in there.
I just went through that exact same thing. I ended up putting the right wheels up on cinder blocks and sprayed penetrating oil on the shaft and letting it set overnight. I was still a sob to get off. With every tap of the hammer it moved about .020. It took forever but it did finally come off. Once it was off it went back in place and back off again with ease.
I used a puller to apply pressure on it while I tapped the shaft. You just have to be careful not to put too much pressure on the sheeve. It only takes a little pressure. I put a thin coat of antiseize on mine and no more problems since.
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