Farm Equipment - Question on WD PTO Shear Pin

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Question on WD PTO Shear Pin

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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=45742
Printed Date: 10 Sep 2025 at 2:24pm
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Topic: Question on WD PTO Shear Pin

Posted By: hardwood61
Subject: Question on WD PTO Shear Pin
Date Posted: 17 Feb 2012 at 10:03am

Just picked one up yesterday as a spare - bought tractor last year and have it stored at hunting land so I couldn't verify the size but the implement dealer said it is the right one - it is 1/2" in diameter and 2 1/2" long and ... cost $20. Is this right? I remember putting one in last year that the guy had in the tool box but I didn't think is was 1/2" so I thought I should ask here cause if it ain't the right one it's going back.

Replies:

Posted By: GregLawlerMinn
Date Posted: 17 Feb 2012 at 11:43am

Memory fails me on the size; it wants to come up with either 1/2" or 7/16". A Grade 2 or Grade 5 bolt (right length) will also suffice as a shear pin.

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Currently have: 1 D14 and a D15S2.
With new owners: 2Bs,9CAs,1WD,2 D12s,5D14s,3D15S2s, 2D17SIVs,D17D,1D19D;1 Unstyled WC

Posted By: 79fordblake
Date Posted: 17 Feb 2012 at 1:01pm

I use the cheapest bolts I can get and the bolt at the pto shaft hardly ever shears. They only cost about a $1.25 a pound.

Posted By: old farmer
Date Posted: 17 Feb 2012 at 3:04pm

The bolt is a special shoulder bolt that is used. Don't know the size. Grade 5 or 8. 2 is too soft.

grade 5 or

Posted By: Orange Blood
Date Posted: 17 Feb 2012 at 3:08pm

It is a special bolt, as old farmer indicated, it has two dimensions on the shaft portion of the bolt. All that being said, so many of them are so worn out, that most will take a 1/2" bolt, I wouldn't go over a standard soft bolt (grade2) if using 1/2" or it will lead to other broken parts if it ever needs to shear. If the holes are worn out, and the thing has been running loose for some time, you may need a grade 5, just to hold since the shearing forces won't be even on both sides.

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