Toro 521 Snowthrower, model 38052

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  #1  
Old 03-17-07, 11:18 AM
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Toro 521 Snowthrower, model 38052

Started clearing off results of our latest snow storm this morning with my Toro 521 Snowthrower. Snow was very heavy and wet. Snowthrower is a 5hp and seemed to work ok at first as long as I didn't push it. After awhile the main, or primary auger, (on the left side from the operators position) stopped turning. The other auger seems to work ok.
I can turn the auger that stopped working by hand, it doesn't feel like it is attached to any gears....does this sound like a sheer-pin or something equivalent? If so, is it a difficult job to replace?
I can use all the help I can get.....thanks, John
 
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  #2  
Old 03-17-07, 10:44 PM
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john
It definately sounds like you broke a shear bolt. If you look at the auger in question you will see a spot for a (possibly 5/16-18) bolt to go through. If it sheared completly you may have to use a punch to knock the rest of the bolt out of the auger shaft. Spin the auger shaft around to where the bolt used to go and you may see where the hole is.
Before you so this, remove the spark plug wire from the plug.

snoman
 
  #3  
Old 03-18-07, 03:35 PM
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Toro 521 Snowthrower, model 38052

Thanks Snoman, I will follow your good advice.
John
 
  #4  
Old 03-20-07, 12:21 PM
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jmel, how'd you make out? I know this is a tricky shear bolt to replace due the drum style collector. I've had instances, on these units, where I've had to remove the end frame of the auger housing to access the bolt.
 
  #5  
Old 01-11-11, 01:19 PM
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Exactly the same problem - almost four years later.

I was very happy to see these postings - 46 months after they were submitted. I had the exact same problem with an identical Toro 521 Snow Thrower after clearing 20+ inches of wet snow from my driveway last week. Just like jmel's machine, my 16-yr old Toro was only throwing snow from 1/2 of it's width. Turns out that it was missing the left hand side sheer pin allowing one of the two primary augers to spin freely when the unit was shut down. I found a usable replacement for the missing sheer pin and after rummaging through one of my (many) old bins of assorted junk. I found a 3" long 1/4" hardened screw and some locking nuts. Five minutes later the problem was solved. 12" of snow is due tonight here in Southeastern CT so I'll be able to test the fix tomorrow. Wish me luck and thank you all for this very useful post.
 

Last edited by dvandors; 01-11-11 at 01:53 PM.
  #6  
Old 01-11-11, 03:07 PM
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dvandors
One thing that got my attention is that you mention you found a "1/4 " hardened" bolt. That may be a mistake because you either want to use a low grade bolt or an actual shear bolt. Hardened bolts won't break as easily as shear bolts when you encounter something hard, thus causing possible damage to another area of your snowblower (which is usually the expensive parts).
Your fix will probably get you through the running of your machine but I would get a proper shear bolt as soon as time permits.

snoman
 
  #7  
Old 01-11-11, 03:22 PM
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Toro uses grade 5 bolts for shear bolts

AJ
 
  #8  
Old 02-01-11, 09:29 AM
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Good to know. The other side of the auger just sheered - I applied the same temporary fix but at the same time, I ordered Toro replacement parts and will swap them when they arrive. Thanks again!
 
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