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Ariens ST 724 impeller does not move under stress?

Moved some heavy snow today and then the impeller stopped working. No objects in the way.
Spins if I clear chute but boggs and does not have enough power to move snow out chute. Do I tighten belt? Does it have that capability or do I need to replace the belt. If so what is the belt #?
Thanks for all your help.

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I have a old ariens ST724 snowblower engine will only run with full choke.

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