Are Grade 8 bolts sufficient
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=198687
Printed Date: 24 Sep 2024 at 11:34am
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Topic: Are Grade 8 bolts sufficient
Posted By: AveryD12
Subject: Are Grade 8 bolts sufficient
Date Posted: 13 Dec 2023 at 5:51pm
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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 |
Replies:
Posted By: PaulB
Date Posted: 13 Dec 2023 at 6:48pm
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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 |
Posted By: Tracy Martin TN
Date Posted: 13 Dec 2023 at 8:09pm
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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! |
Posted By: dfwallis
Date Posted: 13 Dec 2023 at 8:40pm
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.
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AveryD12 wrote:Posted By: AveryD12
Date 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. |