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My 520xi mounted snowblower is vibrating like crazy. The collars on the jack shaft both came loose and cracked. I pulled the front half of the unit apart after taking the chain off and the jack shaft feels smooth and has no lateral movement. I noticed my chain is very stiff and worn on one inside edge. My impeller was bent a few years ago and I did my best to straighten it out on the maching. I didn't have a wheel puller and could not pull the sprocket fron the impeller shaft. It is my belief that the impeller is still bent enough that it is way out of balance.. could that be causing the vibration? Could the chain be causing the vibration? The chain was very loose. The vibration is so severe that the drive pully is coming loose and dropping its key. I have to tighten the set screws very tight and that makes me nervous. There is a very light bend in th ejack shaft as the pully does move very slightly up and down while rotating.. Any ideas? Where to start, what to eliminate? I think the blower has maybe 25 hours on it since new. Thanks!! Mark
