Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Hello all,

New member here. I seem  to be snapping alot of drive shaft shear pins. These are the pins that are holding the wheels to the shaft. I'm getting the pins from Home Depot because the snowblowers place doesn't have the size I need. I think it's  3/16". Can any suggest why I keep snap these pins.

Thanks

I had an old Craftsman that would break the drive wheel axle bolts.  After replacing the original with a couple shear pins that soon also broke,  I put in a grade 10 bolt and never looked back.  That baby never let go.  The way I look at it, is if the wheels spin a bit, so what?  It's not like an auger taking in something that can cause serious damage. 

Hi all,

Thanks for all the suggestions.

Went and bought some 1/4" Grade 5 bolts. Hopefully this should cure my problem.

If you were using 3/16" before and are now using 1/4" perhaps they had just enough play in them that they were wobbling back and forth and snapping.

That's what I was thinking also. I believe I tried the 1/4" before and they didn't fit. Maybe the holes were not lined up just right.

Thanks again.

Why use a weak grade 5 bolt?  Wouldn't it be wiser to use a grade 10?  I don't understand why this bolt should be allowed to shear under load?  

If the wheels slip a bit, what's the issue with that?   I'd rather have the wheels spin a bit on the ground than have the bolt break.

Hi borat,

Would using a stronger bolt cause any internal damage to gear box or anything else. I'm not to knowledgable about the inner working of the snowwblower.

Emilio wrote:
I can't see how it could. 

The wheels are the only source of resistance.  If they slip, they slip.  So what?  If the machine is put up against a wall and allowed to destroy itself, there may be a possibility that a chain could break but I doubt that would happen.   Maybe others might know something that I'm unaware of but I solved my problem with a grade 10 bolt and never experienced any issues as a result.   If you want to continue replacing bolts, go with the grade 5.  If you don't want to be doing that, use a grade 10. 

My thinking is the pins he was using were grade 2, so grade 5 might be good enough.