Recent Topics
good prepaid cell phone?
by Oldtom
06/30/16 12:42 AM
Waterproof gun bag?
by 901Memphis
06/29/16 11:59 PM
Admin trash the 2 oldest VOAs I posted
by Mainia
06/29/16 11:09 PM
Atlas Copco Roto-Xtend Rotary Screw Comp Oil VOA
by Mainia
06/29/16 11:06 PM
"Global" antifreeze - contains EHA/2EHA?
by Jonzobot
06/29/16 11:03 PM
Schaeffer's# 158 Moly Pure Synthetic Comp. Oil VOA
by Mainia
06/29/16 10:41 PM
Atlas Copco Roto-Xtend Rotary Screw Comp Oil VOA
by Mainia
06/29/16 10:36 PM
My CarQuest premium filter??
by MNfarmer33
06/29/16 10:26 PM
Incandescent Light History and Metallurgy
by MolaKule
06/29/16 09:54 PM
Pass Word Changed?
by ls973800
06/29/16 09:26 PM
Best canned Mandarins
by aquariuscsm
06/29/16 09:11 PM
Super Short Commute OCI?
by randomhero439
06/29/16 09:08 PM
Newest Members
MNfarmer33, doublegarage, goatrancher, jameson223, graywolf001
58322 Registered Users
Who's Online
34 registered (CR94, bvance554, bbhero, alcyon, brian_06328, 5 invisible), 775 Guests and 16 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
58322 Members
66 Forums
251012 Topics
4114504 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#1683467 - 11/24/09 05:28 PM What Grade Bolt For A Bush Hog "Shear Pin"?
pharmer Offline


Registered: 03/03/03
Posts: 68
Loc: NW Tn.
I have an older Bush Hog rotary mower that doesn't have a clutch. Ran over a stump today & it sheared the PTO pin that goes into the Bush Hog gear box. Did what it was designed to do. Can't find a factory pin as my mower is over 30 yrs. old. Bush Hog dealer tells me to use a 3 inch long, three-eighths diameter bolt with a lock-nut. One dealer says to use a Grade 2 bolt, other dealer says to use a Grade 5 bolt. I don't want to damage my tractor's PTO so I'm inclined to go with the weaker Grade 2 Bolt. Any suggestions or advice? Thanx!

Top
#1683484 - 11/24/09 05:41 PM Re: What Grade Bolt For A Bush Hog "Shear Pin"? [Re: pharmer]
MGregoir Offline


Registered: 08/30/07
Posts: 1784
Loc: Bonnyville, AB
I would go with a grade 2. I think they each said a grade in reference to not being grade 8 more than anything.

Top
#1683549 - 11/24/09 06:26 PM Re: What Grade Bolt For A Bush Hog "Shear Pin"? [Re: MGregoir]
HM12460 Offline


Registered: 05/26/07
Posts: 1840
Loc: West Michigan
grade 2 bolts are generally accepted to be the norm for shear pins.
_________________________
2007 Chevy Trailblazer
"Thirsty"

Top
#1683555 - 11/24/09 06:30 PM Re: What Grade Bolt For A Bush Hog "Shear Pin"? [Re: HM12460]
pharmer Offline


Registered: 03/03/03
Posts: 68
Loc: NW Tn.
MGregoir & HM12460, Thanks to both of you for your quick responses. I definitely will be buying Grade 2 bolts to use as "shear pins". Thanks again.

Top
#1683580 - 11/24/09 06:42 PM Re: What Grade Bolt For A Bush Hog "Shear Pin"? [Re: pharmer]
wwillson Offline

Administrator


Registered: 08/20/03
Posts: 1736
Loc: Naperville, IL
+1 on the grade 2. I grew up chopping about everything you could think of with Bush Hog mowers - brush, corn stalks, gopher mounds, etc. The mowers are much tougher than the PTO of the tractor, especially if it's a 540rpm. You want the weakest link to be that shear bolt. I'll bet the grade 2 will be in there for years, or until you hit your next stump.

Fastener strength table

Wayne


Edited by wwillson (11/24/09 06:49 PM)
Edit Reason: added link to table

Top