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How to remove auger grear box from snapper snowblower?

The auger gear box sounds crunchy. How do I remove the gear box to check the worm and related components ? how would I remove the impeller shaft if the worm is worn?
Thanks for any help.
Snapper model I6223. Purchased 1994. 22 inch 6HP
Marksparks, February 2013
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