Snowblower Impeller shear pins vs. roll pins

baymee(LehighValleyPA)February 3, 2011

I believe the two hardened roll pins were used to secure the impeller to the shaft of the snowblower for longevity. I don't know why you couldn't use grade 8 bolts.

I've seen some units use shear bolts

Any opinions one way or the other?

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tomplum

You will normally be fine w/ hardened bolts and nylocs.

    Bookmark   February 3, 2011 at 10:08PM
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rcmoser

IMO I would use the shear pins or soft metal bolts. I know replacing shear pins can be hassle to replace and read where some even shear with ice chunk hits and stops the impeller, but the are there to prevent down stream damage.

    Bookmark   February 4, 2011 at 5:10AM
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andyma_gw

roll pins are prolly used because they stay put and wont mess up the balance. Oh, and they are cheap and easy to install too. Why not just replace them with new?

    Bookmark   February 4, 2011 at 3:59PM
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baymee(LehighValleyPA)

I avoided roll pins because the second time around, they aren't always as tight as the original and because they are difficult to remove in the back. I did one snowblower with grade 8 bolts because roll pins are hardened too. This current job, I used two shear bolts and am hoping for the best. If they break, I'll use grade 8 bolts.

I'm no engineer, but since they are at the centerline of the shaft, I'm not worried about balance.

    Bookmark   February 4, 2011 at 6:34PM
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