Recent Topics
Under Valve Cover gm 5.7 201k miles
by Bryankkkk
34 minutes 0 seconds ago
what tire to run for winter 4wd Tahoe ?
by Arctic388
Today at 10:29 AM
New powder coated steel wheels: should I worry?
by ymc226
Today at 10:12 AM
Stainless Steel, Reusable Oil Filter Information
by BrotherMichigan
Today at 10:02 AM
Power companies are evil, plain & simple.
by Thermo1223
Today at 09:53 AM
Anyone run Nokianís year round?
by Picky1
Today at 09:21 AM
I made the switch to pennzoil...
by SuzukiGoat
Today at 08:47 AM
Light Bulb Cartel
by Vikas
Today at 08:10 AM
Proud of My Dad
by Phishin
Today at 07:06 AM
google earth does not show Panoramio photos
by Trav
Today at 07:06 AM
Philips 9012 in '05 Corolla?
by lukejo
Today at 06:16 AM
new GM 4.3L V-6
by used_0il
Today at 03:02 AM
Newest Members
Thourun, Zach72, SandCastle, ymc226, redwoods73
51758 Registered Users
Who's Online
90 registered (72te27, 95MarkVIII, 943kgt, andersd, 13Tacoma, 89Rustang, 7 invisible), 1615 Guests and 147 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51758 Members
64 Forums
221456 Topics
3502182 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: 1468
Loc: West Michigan
grade 2 bolts are generally accepted to be the norm for shear pins.
_________________________
2003 Dodge Dakota
"Hot Rod Dodge"

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: 1534
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