Snowblower Forum banner

1 - 9 of 9 Posts

·
Registered
Joined
·
817 Posts
Discussion Starter #1
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
 

·
Account closed by member request.
Joined
·
9,612 Posts
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. :eek:k::eek:k::eek:k::eek:k::eek:k::eek:k:
 

·
Registered
Joined
·
817 Posts
Discussion Starter #3
ahh, the wisdom of PS93 :grin: 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?
.
 

·
Account closed by member request.
Joined
·
9,612 Posts
ahh, the wisdom of PS93 :grin: 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?????? :smiley-think001::smiley-think001::icon-doh::icon-doh::icon-doh:
 

·
Registered
Joined
·
817 Posts
Discussion Starter #5
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.
 

·
Registered
Joined
·
1,536 Posts
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.
 

·
Registered
Joined
·
817 Posts
Discussion Starter #8
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.
 
1 - 9 of 9 Posts
Top