Shear Pin = Sheer Torture - Snowblower Forum : Snow Blower Forums
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post #1 of 16 Old 02-13-2019, 05:40 PM Thread Starter
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Shear Pin = Sheer Torture

My John Deere 1330SE snow blower frequently blows the shear pin. Maybe once an hour of use.
With snow as low as 4" or up to 12". Always the same side. In 8 years never on the other side.
I am becoming quite adept at changing pins! Over 75 so far.
The auger turns freely with no apparent free play or wiggle. I use pins from the JD dealer as well as other brands.
These are the pin type with spring clips (not bolts).
No rocks or branches. Sometimes a piece of ice. Usually just snow.
This past summer I attempted to take it apart and inspect but could not get very far with opening the gear housing.
I keep the fittings greased and have tried WD40 & the stuff they sell in Home Depot to keep wet snow and ice from building up. It keeps it clear but does not prevent the shearing.
Suggestions, thoughts please.
Thanks.
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post #2 of 16 Old 02-13-2019, 05:49 PM
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Is the other auger able to wiggle on the shaft? In other words, is it free on the shaft, and is that shear pin therefore able to do its job?

What happens if you swap the two shear pins? Does the failure stay with the side of the machine, or with the shear pins?

And/or, install one of the current shear pins on the good side, as a test, to see if they suddenly start breaking. Maybe your old pins were a lot stronger, and you've just never broken that "good" one.

I've never seen a machine just keep blowing pins for no reason, sorry. Certainly not just on one side, unless there is something different about the other side.

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post #3 of 16 Old 02-13-2019, 06:00 PM Thread Starter
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This past summer when I did yearly oil change and stuff I checked the pins. The one that never broke appeared distorted so I replaced it before it broke using the same pins that I am having trouble with on the opposite side. Always use grease. Both sides rotate on the shaft with no pin the same.
Neither side has any free play or wiggle with pins in place.

Last edited by abytehead; 02-13-2019 at 06:02 PM. Reason: Add info
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post #4 of 16 Old 02-13-2019, 06:05 PM
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What diameter are the pins ? 1/4" or 5/16"
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'71 Jakobson 17 SnowBlitz
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post #5 of 16 Old 02-13-2019, 06:11 PM Thread Starter
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1/4 inch and they fit snug. Bought 5/16 by mistake once and they are way too large.
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post #6 of 16 Old 02-13-2019, 06:13 PM
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Any chance that the auger that keeps breaking pins is periodically catching on the bucket housing somehow? And getting stuck, then breaking the pin? With the pin removed, can you get the auger to touch anything if you spin and side it? Any shiny marks around it, on the bucket or scraper bar?

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post #7 of 16 Old 02-13-2019, 06:21 PM Thread Starter
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I will check that out at first light. Thanks for the tip.
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post #8 of 16 Old 02-13-2019, 06:24 PM
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Those 1/4 pins don't have much meat on them. If they are "full" threaded, there is barely 3/16" on the basic bolt. I would try a bolt from a hdw store with threads only maybe only enough to length to be solid at one side of the shaft / hub areas, you might have to get a bolt that is a little longer than it needs to be, you might want to cut it off, but you don't need to, especially if they break a lot. Just a thought
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post #9 of 16 Old 02-13-2019, 08:11 PM
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If they are the correct shear pins, what would be the advantage of using a normal bolt? They're presumably breaking for a reason. Just using something stronger, that's not the correct part, might simply make something else break.

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post #10 of 16 Old 02-13-2019, 10:04 PM
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Something is binding. You need to disconnect things and start spinning and feeling individual components.

Change brands of pins, are they cheapies? Different quality of steel maybe?

Last resort, always drill it out and use 5/16" pins.

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