Toro 418ze SS shear bolt? - Snowblower Forum : Snow Blower Forums
 
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post #1 of 7 Old 12-17-2014, 09:50 PM Thread Starter
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Toro 418ze SS shear bolt?

I have a 620 and a 418 and have been to home depot snooping also. My 620 has a shear pin (bolt) on the center plate to keep the auger paddle solid. I have had two 418's one of which has ran longer than the other before blowing up from no oil and the scraper has a worn spot that if I twist the center plate the paddle distorts and explains the worn spot.

I searched the parts manual and owners manuals, home depot display units including and other online places and find no information on the bolts for the 418. I was considering a nominal grade 3 1/4" bolt and backing it up with a nylon lock nut.

What would you do? A hole is there just like on my 620 and I did remove the bolt on the 620 to inspect it and there is no weakened shoulder in it just a grade 5 bolt and nut. With no bolt in the 620 the auger would appear to be next to useless and wear the scraper bar in two spots under load like I am seeing on the smaller machine.
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post #2 of 7 Old 12-18-2014, 11:53 AM
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I have a 421QZE from 2008. Single stage blowers do not have shear bolts, that is a standard 1/4"-20 x 1 1/2" grade 5 bolt and a nylock nut.

Toro 8/24 (38080) 1989
Toro 721-QZR (38743) 2015 (Hemi Predator Power)
Toro 421-E (38585) 2008 (New Owner)
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post #3 of 7 Old 12-18-2014, 07:05 PM Thread Starter
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Ok I thought so. I didn't think it would have enough power or kinetic energy to break even a grade 3 bolt but wanted to throw it out there.

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post #4 of 7 Old 12-19-2014, 08:57 AM
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If you look at a i/4-20 thread closely, you will see not much material in the root of the thread, about 3/16 of an inch. It is very likely that it will shear easily when you hit the sunday paper, toy or a stick. I think your good.
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post #5 of 7 Old 12-19-2014, 09:05 AM
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just run a stainless steel nut and bolt. it is the same as grade 5.

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post #6 of 7 Old 12-19-2014, 11:50 AM
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SS isn't hard or brittle, but it is tough. Put one in a vice, and try to break it. I don't think it will shear easily. Just saying.
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post #7 of 7 Old 12-20-2014, 11:16 AM
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those single stages do not run those BLOODY SHEAR pins in the first place. the stainless steel is equal to a grade 5 bolt.

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