I'm amazed that the roll pin is shearing though. I just rebuilt the same model snowthrower and tried it out for the first time. The snow we had was way too wet and dense and I had to switch to the plow because it packed in completely and just plugged the chute. I even stalled the engine completely on a 1450 because it clogged when I pushed it in a show pile, and no damage to anything on the thrower.
Does the impeller spin freely without the chain attached? are the toothed wheels and the chain in good condition or worn out with a lot of wiggle?
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1450- 44A deck,QA-36 snowthrower, 42in front blade No.2 Tiller
70- 38in deck, 42 inch deck
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