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Allis Chalmers Discussion Forum

WD pto shear pin

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Tony S.

01-08-2011 19:41:32

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What are you guys using for shear pins in the pto shaft on a WD? Don't seem to have room for a nut on a 1/2" bolt on mine.

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Ray Burd

01-13-2011 04:39:55

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 Re: WD pto shear pin in reply to Tony S., 01-08-2011 19:41:32  
I learned the hard way not to use a bolt as heavy as a Grade 5 when I bottomed out a 5-foot rotary mower on a stump -- exploded the PTO box just about off the transmission. I can't find Grade 3 half-inch bolts through any of my local sources, so I use Grade 2. I buy in bulk because, with the same hole warbling mentioned by someone else, I replace a couple of bolts each summer. But, replacing those bolts is a lot less expensive than replacing PTO boxes.

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steven wilkowske

01-10-2011 21:20:11

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 Re: WD pto shear pin in reply to Tony S., 01-08-2011 19:41:32  
We always used grade 5 bolts, grade 3 may be softer but don't shear correctly on impact.

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01-09-2011 16:00:28

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 Re: WD pto shear pin in reply to Tony S., 01-08-2011 19:41:32  
I use a grade5 1/2 inch bolt with red locktite.
The hole in the pto shaft is wallowed out and chews the bolt in half given time. I have since found a newer pto drive but haven't got it on yet.

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Tony S.

01-09-2011 13:58:48

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 Re: WD pto shear pin in reply to Tony S., 01-08-2011 19:41:32  
Thanks. I actually was thinking of using some mild steel 1/2" rod and drilling the ends for wire to tie it in. Or maybe hot riveting the ends. I don't expect to do any heavy pto work, maybe a sprayer pump.

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01-08-2011 21:41:03

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 Re: WD pto shear pin in reply to Tony S., 01-08-2011 19:41:32  
I used shoulder bolts from a harware store that has an extensive stock of bolts. He said it was actually an axle bolt for a toy wagon. (Like a radio flyer).

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big jt

01-08-2011 21:40:00

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 Re: WD pto shear pin in reply to Tony S., 01-08-2011 19:41:32  
It is kinda a special bolt. Half inch bolt with 3/8 threaded end. Lets you clamp it in tight to the shaft without trying to clamp down on the shaft itself.

AC and lots of aftermarket places handle this bolt.


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01-08-2011 20:39:05

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 Re: WD pto shear pin in reply to Tony S., 01-08-2011 19:41:32  
Been a long time since I replaced one but if I remember right it is a 1/2 inch bolt and a nut but as I said been a long time since I had to replace one

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01-09-2011 07:58:38

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 Re: WD pto shear pin in reply to old, 01-08-2011 20:39:05  
Even with an Original shear-bolt, I drill both ends, so I can safety-wire them in. If the bolt does shear, an end is not going to slip out and jamb against the case.. Never thought about a Lawn Mower spindle bolt...!! Good idea..!


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