The blower needs to be engaged at idle, as the rotating assembly has a LOT of inertia, and the more acceleration you impart on it, the more force is being applied to the splined shaft, causing what you have experienced. If you have been engaging it at idle, odds are whoever had it before you probably wasn't and damaged it. That wouldn't be doing the belt any favors, either. If you keep breaking belts, either you have worn out sheaves, bad idler, misalignment issues, or something like that. The cost of the parts is far cheaper than a newer (inferior) machine...
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