Karl, there is an illustrated parts list for the Imperial in the manuals section of this site (subscription required). Here are a couple of excerpts from it:
[Linked Image]
[Linked Image]

The parts in the box on the right of the diagram are only for the 24" HD model.

I do not have enough information from this to see how you take the mower apart, but it shows us what the parts are, and gives their names. It looks as if you have to remove the sprocket (68) and then remove the reel complete with its bearings in their housings (60 & 61). If you post some pictures of the sprocket, and the bearing housings, we may be able to see how to remove the reel.