I looked at your photos and I'd say fix it. Yours is in much better shape than mine. Drill some small holes at the very outer most point in the cracks to keep them from going farther 1/16" or so is plenty. With some new hardware rebolt your blower into place. and that should be fine.
As for being hard to crank, these have a ratchet system that can get finicky to say the least especially if they have been lubed with oil (dry graphite works nicely). When you take it apart be sure to watch which way the dogs lay inside the housing and then once you clean it up you'll be able to put it back together (may need an extra hand?) Check and see that your gears are clear of debris a wire brush to remove rust, scale or other foreign material will help keep from having a catch spot.
Another place to check (before bolting it back up would be easy) is to see that the blower turns easily. Being in storage for a while it could have just about any kind of nasty inside it (mouse nest, wasp nest, dauber nest) or rust you've knocked loose in your first go??? Of course bad bearings are also a possible problem, but look for the easy stuff first.
Another point of catch can be the handle or the linkage from the handle, check to be sure it isn't getting into a bind.
The nearly turned over forge is why I stake mine down, though I know my forge fairly well, it keeps from having an aggressive helper dump it over.
Any other questions let me know and I'll try and help...
James