Page 1 of 2 12 LastLast
Results 1 to 10 of 15
  1. #1
    Silver Member
    Join Date
    Sep 2002
    Posts
    163
    Location
    Southport NC
    Tractor
    TYM 723

    Default Bush Hog shear pin

    I have a 6 ft King Kutter BH that came with a grade 2 bolt as the shear pin. Does anyone know wether or not that is the correct hardness for this application? Sure seems like I go through a lot of them.
    Thanks,

  2. #2
    Platinum Member
    Join Date
    Apr 2000
    Posts
    762
    Location
    Greater Springfield area, Massachusetts
    Tractor
    Kubota B2910, also Honda HT3813 with mower and front blade.

    Default Re: Bush Hog shear pin

    Eric,

    I can't answer your question, but I'd like to "tag-a-long" a shear bolt question of my own. With any luck, the wisdom of this board will be able to address both issues at once.

    In preparation for winter, I checked the 2 shear bolts on my Woods SS60 snowthrower. I figured it's better to get familiar with them now, before they shear and I have to replace them in the bitter cold. Anyway, the manual specifies them as both being 5/16"x1" long bolts. One of them is on the tractor end of the PTO shaft and the other is on the auger chain sprocket.

    I removed them both, and sure enough, they are the size specified. However, the PTO bolt is a grade 8 (6 dashes) and the sprocket bolt is a grade 5 (3 dashes). I was expecting grade 2!

    My dealer thought that was a bit odd and was going to look into it. While I had the bolts out, I picked up a couple of grade 2 replacements. I wanted Grade 5, but as is always the case, the hardware store didn't have the Grade 5 bolts in that size.

    My question: If I use grade 2, could I cause any damage? By my reasoning, I figure they'll shear before the grade 5's or 8's would. If they shear too easily, then I figured I'd try grade 5's, once I pick some up.
    But the grade 2's should work in a pinch.

    It sort of defeats the purpose of using the same size shear bolt for both applications if you have to keep two different types (hardnesses) of bolts on hand.

    Any comments?

    And yes, I know, a new snowblower with plenty of spare shear bolts guarentees that there won't be a flake of snow within our property all winter. [img]/w3tcompact/icons/sad.gif[/img]

    ~Rick


  3. #3
    Gold Member
    Join Date
    Nov 2001
    Posts
    323
    Location
    Northern Kentucky
    Tractor
    l245dt

    Default Re: Bush Hog shear pin

    yes grade 2 are the right bolts to use.
    i made the mistake of just throwing any old bolt in my bush hog and then i hit a stump and wam i busted my ptoshaft up inside the tractor.
    breaking the shaft wasnt as bad as putting a new one in.
    i had to split the tractor to fix it.
    so if i was you i would use grade 2 bolts

  4. #4
    Silver Member
    Join Date
    Jan 2001
    Posts
    147
    Location
    Rockingham County, Va.
    Tractor
    NH TC35 bought 5/01

    Default Re: Bush Hog shear pin

    Grade 2 are what are specified for my Land Pride rotary cutter and the bottom of my toolkit is littered with evidence that they shear just fine (well part of the evidence...the rest is in the field somewhere).

  5. #5
    Platinum Member
    Join Date
    Feb 2004
    Posts
    957
    Location
    15 mi. N. of Winchester VA
    Tractor
    CK30HST

    Default Re: Bush Hog shear pin

    Just got an SB74-2 blower, posted msg a while ago, seems Woods initially specified a no-name-no-hardness bolt but it has been updated on the parts list to a grade 8 bolt. That's all I know! Maybe a harder bolt fractures more easily? Less easily?

    Mike

  6. #6
    Veteran Member Poopdeck Pappy's Avatar
    Join Date
    May 2013
    Posts
    2,417
    Location
    Dallas, Texas
    Tractor
    Kioti DK50SE Cab, Kubota BX23, Kubota BX2660, Grasshopper 729BT

    Default Re: Bush Hog shear pin

    Quote Originally Posted by mrutkaus View Post
    Just got an SB74-2 blower, posted msg a while ago, seems Woods initially specified a no-name-no-hardness bolt but it has been updated on the parts list to a grade 8 bolt. That's all I know! Maybe a harder bolt fractures more easily? Less easily?

    Mike
    You are replying to a 12 year old thread, so I suspect he's got his shear pin issues worked out by now.

    FYI, I would never use a Grade 8 bolt for a shear bolt. Most manufacturers specify a Grade 2 it seems to me. Grade 8 seems like a good way to negate the whole purpose of the shear bolt setup.
    __________________

    Pappy

  7. #7
    Bronze Member
    Join Date
    Jun 2005
    Posts
    74
    Location
    Middleburg Fl
    Tractor
    Kioti CK30, Kioti DK45hst

    Default Re: Bush Hog shear pin

    Quote Originally Posted by Poopdeck Pappy View Post
    You are replying to a 12 year old thread, so I suspect he's got his shear pin issues worked out by now.

    FYI, I would never use a Grade 8 bolt for a shear bolt. Most manufacturers specify a Grade 2 it seems to me. Grade 8 seems like a good way to negate the whole purpose of the shear bolt setup.
    I had the same problem with a woods BB60. was shearing grade 2 bolts faster than I could change them. I installed a slip clutch using a grade 5 and solved the problem

  8. #8
    Super Member Gary Fowler's Avatar
    Join Date
    Jun 2008
    Posts
    9,660
    Location
    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: Bush Hog shear pin

    I would go to a higher grade if it is shearing bolts for no reason (not hitting anything but grass). My BIL had to go to a grade 5 to keep his Fred Cain BH from shearing when engaging the PTO even at an idle. I have seen it shear a GR.2 bolt when mowing light grass and no obstacles. Some shear bolts are just not the right size/type to begin with. Move up a grade at a time till it only shears when it should, like when you hit a hidden object and not when you just engage the PTO.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  9. #9
    Platinum Member JWR's Avatar
    Join Date
    Apr 2011
    Posts
    557
    Location
    So MD / WV
    Tractor
    MF 2660 LP, Kubota B2150, Kubota BX2200, MH Pacer, Gravely 5660, etc.

    Default Re: Bush Hog shear pin

    Maybe this is a timeless topic or maybe all shear bolt issues were solved years ago. Anyway ... using a 4ft John Deere 413 (with no slip clutch) I found the critical factor is the bolt fitting the hole. On my 413 the correct bolt is metric and grade 5 is recommended. When I used an English dimensioned (3/8" or so) bolt that had a little bit of play in the hole it would shear every time I tried to use it. Once I used metric bolts that fit the hole tightly and happened to be grade 5 I have never had a single problem since. I came away with the opinion that a good snug fit in the shear pin hole was at least as important as what grade bolt it was. In my experience only the smaller hogs (being used on smaller tractors) have shear pins instead of slip clutches. I favor using a grade 5 at least if not an 8. However, a grade 2 shear bolt is very cheap. Try it ! If the thing does not become a nuisance by shearing all the time then you have the best protection. If it shears often, go up a grade on bolt hardness but make sure it fits snug first.
    jwr
    ------------------------------------------------------
    MF2660 LowProfile, 7', 5' and 4' BushHogs, Orsi Articulated boom hydraulic rotary cutter, Landpride 6' finish mower, Kubota BX2200, Two Kubota B2150's, 5' snowblower, 6' blade, scraper box, Gravely 1983 w/sulky, mower & snow blower, misc. attachments. Pequea 1018 deckover trailer, half interest in Massey Harris Pacer family heirloom... and a lot of junk...

  10. #10
    Gold Member Ultradog MN's Avatar
    Join Date
    Jun 2006
    Posts
    268
    Location
    Twin Cities, MN
    Tractor
    Ford 3000 Ford 4400 Ford 4200

    Default Re: Bush Hog shear pin

    It can not be a Bush Hog® if it is a King Kutter.
    ---------------------------------------------------
    “What's right about America is that although we have a mess of problems, we have great capacity - intellect and resources - to do something about them”
    Henry Ford

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2016 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.