Did all MTD blowers have shear pins? - Snowblower Forum : Snow Blower Forums
 
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post #1 of 10 Old 07-02-2015, 09:20 PM Thread Starter
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Did all MTD blowers have shear pins?

my MTD blower early 80's vintage has regular bolts not shear pins. The parts manual shows just 5/16 hex bolts.
Did some of these blowers not have shear pins?
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post #2 of 10 Old 07-02-2015, 09:33 PM
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I know Toro uses regular bolts. Ariens uses 5/16" nuts and bolts, but the bolts have a groove cut in them. They look a lot like normal bolts, but are actually shear bolts.

It is possible there is something special about the bolts. Does the manual actually say they are normal bolts or do they have a special part number on them?

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post #3 of 10 Old 07-02-2015, 10:11 PM
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The "legacy" machines were much more robust machines. They may indeed utilize common hardware parts. The machine in my wife's family, has one bolt that is located up at the transmission PTO. It attaches the drive sprocket to run the chain. It's a single stage machine, that is self propelled.

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post #4 of 10 Old 07-03-2015, 09:39 AM Thread Starter
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Quote:
Originally Posted by Shryp View Post
I know Toro uses regular bolts. Ariens uses 5/16" nuts and bolts, but the bolts have a groove cut in them. They look a lot like normal bolts, but are actually shear bolts.

It is possible there is something special about the bolts. Does the manual actually say they are normal bolts or do they have a special part number on them?
The parts list just says "Hex bolt 5/16" and in the drawing it doesn't look like a shear pin, just a regular bolt.

I wonder if I should put a shear pin in it just for kicks?
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post #5 of 10 Old 07-03-2015, 10:25 AM
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Quote:
Originally Posted by db9938 View Post
The "legacy" machines were much more robust machines. They may indeed utilize common hardware parts. The machine in my wife's family, has one bolt that is located up at the transmission PTO. It attaches the drive sprocket to run the chain. It's a single stage machine, that is self propelled.
That's how mine is too.
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post #6 of 10 Old 07-03-2015, 11:41 AM
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Toros are not regular bolts, they are a softer grade of metal.
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post #7 of 10 Old 07-03-2015, 12:19 PM
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Quote:
Originally Posted by wheelhorseboy View Post
Toros are not regular bolts, they are a softer grade of metal.
Toro actually uses grade-5 bolts for the shear pins. THEY say their gear boxes are strong enough to not need softer shear pins????

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post #8 of 10 Old 07-03-2015, 12:40 PM
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Dont remember what grade tbey said they where at the schools, deffinatley not a grade 8. Whatever they are, i do know they will sheer when something is hit. Have always used the bolts straight from Toro on mine.
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post #9 of 10 Old 07-03-2015, 04:29 PM
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Or for a Toro using stainless steel would be good too as it's not as strong and likely won't seize.

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post #10 of 10 Old 07-03-2015, 10:12 PM
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This might be one of the only appropriate applications of those cheap non-graded, Chinese bolts.

They may not be as reliable as a #5, but it would prevent you from tearing up anything upstream. And as cheap as they are, for a buck or two you could have a couple hands full of them for the season.

Garage:
MTD....2 stage(modern 8.5 HP) not my favorite
Honda HS622 TA-B - acquired at an auction- nice machine for it's size.
Toro S-140- Picked it up on trash day... it runs, sort of.
Yamaha YS 240 TB "Ricky" latest Craigslist find- on the bench now.
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