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Are Grade 8 bolts sufficient
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AveryD12 View Drop Down
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Joined: 05 Mar 2018
Location: Foxworth.MS
Points: 86 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AveryD12 Quote  Post ReplyReply Direct Link To This Post Topic: Are Grade 8 bolts sufficient
    Posted: 13 Dec 2023 at 5:51pm
Doing a little bush hogging with the D12. Noticed the Bushhog looked a little closer to the left tractor tire than the right tire. Did a little investigating and found 3 bolts missing from the3 point lift. I don’t know what grade bolts were in there to begin with but replaced them with Grade 8. The 2 remaining bolts were loose. These 2 loose bolts (3/4” x 2-3/4” long) attach the lift and pull bar to the rear differential housing.1 of the missing bolts was 9/16” and also bolted into the differential housing. The other 2 missing bolts were 5/8” and attached lift arm pivot point. I’m curious if Grade 8 bolts are sufficient. Any thoughts??
Thanks
Avery
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PaulB View Drop Down
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 4727 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec 2023 at 6:48pm
The factory 3pt hitches  for the D10/12/15 tractors are one of the worst design flaws that Allis Chalmers made. If the holes are not already wallowed out, continued use will soon have them unuseable. If a standard tread bolt will go in using a grade 8 will suffice. however as yours have loosened on there own already, you may never get them to stay tight. Get the holes as clean as possible and us Loctight, then check them often. 
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Tracy Martin TN View Drop Down
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Joined: 11 Sep 2009
Location: Gallatin,TN
Points: 10624 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tracy Martin TN Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec 2023 at 8:09pm
Paul is correct on the 3 point. Too light and pulling stress not adequately addressed with bolt placement and layout. If wallowed a little, a machine shop can make you an oversized bolt or better yet a stud. If needed an oversize tap of same pitch can be used, and bolt or stud sized to suit. Loctite is a must. I would be surprised you haven't lost most of your rear-end and tranny fluid. HTH Tracy
No greater gift than healthy grandkids!
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dfwallis View Drop Down
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Joined: 09 Mar 2023
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Points: 627 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 13 Dec 2023 at 8:40pm
Originally posted by AveryD12 AveryD12 wrote:

Doing a little bush hogging with the D12. Noticed the Bushhog looked a little closer to the left tractor tire than the right tire. Did a little investigating and found 3 bolts missing from the3 point lift. I don’t know what grade bolts were in there to begin with but replaced them with Grade 8. The 2 remaining bolts were loose. These 2 loose bolts (3/4” x 2-3/4” long) attach the lift and pull bar to the rear differential housing.1 of the missing bolts was 9/16” and also bolted into the differential housing. The other 2 missing bolts were 5/8” and attached lift arm pivot point. I’m curious if Grade 8 bolts are sufficient. Any thoughts??
Thanks
Avery

Slightly older AC tractors were largely 4140s.  That's roughly grade 5.  Grade 8 would be better.  When I replace, I usually go with grade 8 but selectively with stainless.  Stainless can be more brittle so should be used carefully in snap-prone conditions.


Edited by dfwallis - 13 Dec 2023 at 8:52pm
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AveryD12 View Drop Down
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Joined: 05 Mar 2018
Location: Foxworth.MS
Points: 86 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AveryD12 Quote  Post ReplyReply Direct Link To This Post Posted: 14 Dec 2023 at 6:17am
Thanks to all for the replies. I will remove the new bolts try to clean the threads and apply loctite. I like the little tractor. It is real handy to have around for small jobs. Never have been crazy about the 3 point hitch.
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