Toro 521 pulley bolt - Snowblower Forum : Snow Blower Forums
 
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post #1 of 9 Old 09-27-2018, 11:44 PM Thread Starter
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Toro 521 pulley bolt

On the older 521 units, is the bolt that holds the pulleys on the crankshaft just a standard bolt with blue loctite? The drawings call it a "special screw", but it appears to be a 7/16-20 bolt (I need to confirm pitch). I have cleaned the old loctite off the screw threads with a dremel wheel, but before I chase the threads on the crank I wanted to be sure.

part #24 on this reference diagram: https://www.toro.com/en/parts/partdetails/?id=2834

Thanks

Paul
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1995 Toro 724, 1988 Toro 521
1980 Toro 421, 1995 Craftsman 524
1997 Toro CCR 2500 & 1994 Toro CCR Powerlite
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post #2 of 9 Old 09-28-2018, 01:42 AM
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Originally Posted by paulm12 View Post
On the older 521 units, is the bolt that holds the pulleys on the crankshaft just a standard bolt with blue loctite? The drawings call it a "special screw", but it appears to be a 7/16-20 bolt (I need to confirm pitch). I have cleaned the old loctite off the screw threads with a dremel wheel, but before I chase the threads on the crank I wanted to be sure.

part #24 on this reference diagram: https://www.toro.com/en/parts/partdetails/?id=2834

Thanks
If that is zee bolt you pulled oot. then that is what it is. should be a Grade 8 bolt though.

Long LIVE THE POWERSHIFT!! MAY IT NEVER RUST IN PEACE!!
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post #3 of 9 Old 09-28-2018, 11:28 AM Thread Starter
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ahh, the wisdom of PS93 It was actually a 3/8-24. My question is really what makes it "special" There are other bolts the use loctite, why is this one called out?
.

Paul
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1995 Toro 724, 1988 Toro 521
1980 Toro 421, 1995 Craftsman 524
1997 Toro CCR 2500 & 1994 Toro CCR Powerlite
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post #4 of 9 Old 09-28-2018, 05:17 PM
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ahh, the wisdom of PS93 It was actually a 3/8-24. My question is really what makes it "special" There are other bolts the use loctite, why is this one called out?
.
Grade 8 Bolts have the highest tensile breakage point of them all. that is what that bolt was spec'ed at. When it left the Little TORO Factory Here. you don't want anything to break on you when you are going FULL BORE on in the BIG WHITEY. Now do you??????

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post #5 of 9 Old 09-28-2018, 08:36 PM Thread Starter
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hmm. the one I took out was grade 5 bolt. Do you have a torque spec for this? I could not find one, only for the cylinder cover bolts.

Thanks.

Paul
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1995 Toro 724, 1988 Toro 521
1980 Toro 421, 1995 Craftsman 524
1997 Toro CCR 2500 & 1994 Toro CCR Powerlite
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post #6 of 9 Old 09-28-2018, 09:00 PM
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I don't think it's all that "special".


Is it all threads (no shank). If I were to make a guess at what makes it special, it would be the shank-to-thread ratio.
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post #7 of 9 Old 09-28-2018, 09:11 PM
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My new guess is it may be the pre-applied thread locker. If it were me....I wouldn't hesitate to get an off the shelf bolt.

Here is a link to one (with photo) for anyone that wants to add their opinion.
https://www.ereplacementparts.com/sc...-p-685653.html
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post #8 of 9 Old 09-28-2018, 09:17 PM Thread Starter
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yeah DBert, that is the only supplier picture with an image. On mine, it is not all threads, about 1/4 of the length is not threaded. I'm thinking the pre-applied loctite is the "special" part too. Note that I am not worried about this part, just inquisitive about it.

Paul
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1995 Toro 724, 1988 Toro 521
1980 Toro 421, 1995 Craftsman 524
1997 Toro CCR 2500 & 1994 Toro CCR Powerlite
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post #9 of 9 Old 09-28-2018, 09:21 PM
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Understood. I appreciate you pointing it out. Being labeled as "special" that is.
As for the torque value, when all else fails there is always the ole "standard" torque values.
https://www.boltdepot.com/fastener-i...ed-Torque.aspx
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