Shear Pins Breaking - Snowblower Forum : Snow Blower Forums
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post #1 of 22 Old 07-02-2015, 11:19 AM Thread Starter
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Shear Pins Breaking

The seller that I bought my used snow blower from said that the shear pins will break often and I should expect that. He gave me a bag of shear pins.

Looking at the auger, he must have hit something really hard because one area of the auger is really banged up. I moved around the auger and it's not spinning by itself so I'm assuming that the gearbox is ok.

But, I'm also assuming that the shear pin shouldn't be breaking often. Is there something I can do to prevent the shear pins from constantly breaking during the winter while cleaning snow?
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post #2 of 22 Old 07-02-2015, 11:26 AM
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It should not happen unless something (newspaper, rock, branches, or any solid object) jams in the augers or impeller. That is why it is good to clear the area you'll be cleaning prior to each snowfall.
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post #3 of 22 Old 07-02-2015, 11:59 AM
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Could be he was over tightening them and weakening them or using the wrong size as well. Is the machine adjusted so low that the augers are hitting the ground?

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post #4 of 22 Old 07-02-2015, 12:10 PM Thread Starter
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Yeah, I thought it was unusual that he said that. I guess he didn't want me to get upset when the shear pins keep breaking during the winter. So, I'm assuming something is wrong with the snow blower.

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Originally Posted by hsblowersfan View Post
It should not happen unless something (newspaper, rock, branches, or any solid object) jams in the augers or impeller. That is why it is good to clear the area you'll be cleaning prior to each snowfall.
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post #5 of 22 Old 07-02-2015, 12:10 PM Thread Starter
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Maybe that's it. I'll check the size and see if it matches. The skid shoes aren't too low it seems but I'll try to raise a little bit, just in case.

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Originally Posted by Shryp View Post
Could be he was over tightening them and weakening them or using the wrong size as well. Is the machine adjusted so low that the augers are hitting the ground?
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post #6 of 22 Old 08-30-2015, 03:06 PM
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What brand are we talking about?


On my 5hp Craftsman, I just broke my first shear pin last season.
My blower is from around 2000 and I am not really that easy on it.

I broke it while trying to clear some hardened old snow/ice on the side of the street.
But I think mine might have been a little fatigued from all the years I had been chopping away at the hard stuff. I am surprised that the pin lasted as long as it did.

Now the guy behind me has a 9hp Craftsman and he goes through 3 or 4 pins a season. And compared to me he is gentle with his blowers.
He got the blower for free maybe because it goes through shear pins?
So he just bought a big bag of them.
So for whatever he paid for the pins is what he got the blower for. The machine looks like new, he can't figure it out. He does have other blowers and he just saves that one for the deeper snow.

I hate shoveling SNOW!
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Craftsman #536886141(Around 2000?)
5 Horse, Tecumseh HSSK50-67392S
22" Dual Stage
***********************
"Classic" 1963 S-226 Snowbird
4 Horse (orig) Briggs & Stratton#6305201
22" Dual Stage
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post #7 of 22 Old 08-30-2015, 09:26 PM
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Take a look at the hardware. Bolts for skids and drift cutters usually want to be installed for the lowest profile in the bucket, usually head in, nits on the outside.

While your augers may appear to clear the hardware they may be enough slop and deflection under load for an auger tip to snag a bolt causing the machine to shear against itself. There may be a signature on the outboard auger tips if this is the case.
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post #8 of 22 Old 08-30-2015, 09:43 PM
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Remove the shear pins and spin the augers to see if there is any binding. If they spin freely then as mentioned previously, it is likely the tightening or the wrong type.
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post #9 of 22 Old 08-31-2015, 07:29 AM
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Garage
Did the guy you got it from have a gravel driveway ??

.
Make sure the windows are up before the snow plow goes by !!

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post #10 of 22 Old 08-31-2015, 07:31 AM
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I went from an old BearCat, with a clutch which slipped when the augers bound up, to a Honda with shear pins. I broke a half dozen of the darn things before I adjusted my technique! I was used to being able to blow snow right up until the augers contacted the woodpile. With the BearCat the augers would simply stop turning; with the Honda, *plink*! There goes another shear pin. But then I'm a bit of a slow learner.
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