Recent Topics
Old socks
by Marco620
09/27/16 12:54 AM
Thanks Bitogers
by Marco620
09/27/16 12:27 AM
Matic-D alternative for Nissan
by NattyBoh
09/27/16 12:01 AM
Honda Pilot VCM Sludge
by FranklinJL
09/26/16 11:01 PM
5.7 Hemi water pump
by mobilaltima
09/26/16 08:38 PM
call me crazy
by mobilaltima
09/26/16 08:33 PM
Conventional oil with extended filter, can I skip
by RegDunlop
09/26/16 08:20 PM
Inconsiderate people....
by montero1
09/26/16 08:02 PM
Everyones Favorite 5w30 Dino And Why?
by crazyoildude
09/26/16 07:48 PM
Purolator L36135 - 9k miles
by webfors
09/26/16 07:35 PM
Keeping rodents out of engine bay?
by Klutch9
09/26/16 06:42 PM
Valvoline VO-105, 7,400 miles CUT OPEN
by car51
09/26/16 06:35 PM
Newest Members
BkOB, 3rdsaturn, barajasrichie, Rocdoc27, andy1400
59197 Registered Users
Who's Online
17 registered (BrianF, dustyroads, bvance554, Chewie, 901Memphis, 1 invisible), 829 Guests and 17 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
59197 Members
66 Forums
254962 Topics
4188002 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: 1880
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: 1776
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