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WD45 PTO shear bolt size

O

old

Well-known Member
I asked this down in the A/C forum but figure I might get a faster answer here. So I hooked up the NH271 the the WD45 an put the PTO in gear so as to spin it up to check things out. It did not spin up due to the fact the shear bolt was missing. Had a 7/1 bolt on hand but it seems a bit loose in the hole so should it be 7/16 or 1/2 inch?? Thanks
 
Shear bolt on the baler? Make sure it's exactly the right one.....too weak of a grade of bolt will cause excessive bolt breakage....too strong of a grade of bolt and something much more expensive may break. Get a handful of the correct bolts, usually best got at the dealer, and that will last you for years. Good luck with your haying!

Ben
 
Shear bolt on the tractor PTO shaft no on the baler. I know the size of the bolts on the baler and keep extras in the twine box tool box just for it.

But either way I went ahead and pulled out he 7/16 bolt and found a 1/2 inch bolt fit so it now has a 1/2 inch bolt in it
 
(quoted from post at 20:57:17 10/14/19) I asked this down in the A/C forum but figure I might get a faster answer here. So I hooked up the NH271 the the WD45 an put the PTO in gear so as to spin it up to check things out. It did not spin up due to the fact the shear bolt was missing. Had a 7/1 bolt on hand but it seems a bit loose in the hole so should it be 7/16 or 1/2 inch?? Thanks
Click to expand...

The original is a special type of "shoulder" bolt.......the main part of the bolt is 1/2" with the end reduced to 3/8", threaded and fitted with a locking nut.
Replacing with a regular 1/2" bolt can be done; however, you have to make sure that the unthreaded portion of the bolt goes all the way thru the collar part of the PTO shaft.
Unfortunately, like others have said, the holes are often "wallered" out.
BTW, this was never intended to be a "shear" bolt although using a Gr2 bolt might make it that.
 
On an older JD square baler we have, the flywheel shear bolt is 9/32" in diameter and is a grade 8 strength. The threaded end is 1/4" NC thread. Obviously they make them 9/32 so using 1/4" bolts out of your tin can supply is too small and a 5/16" one won't fit.
 
Well, now I know that the Allis has a shear bolt for the pto.....never looked at one close enough to see that. Something learned today!

Ben
 
(quoted from post at 01:45:43 10/15/19) Well, now I know that the Allis has a shear bolt for the pto.....never looked at one close enough to see that. Something learned today!

Ben
Click to expand...

Again.....it was not designed to be a shear bolt.....its merely a connection bolt.
I have never seen any A-C literature refer to it as a shear bolt!
 
I did use a lug type nut on the end of the 1/2 inch bolt so as to sort of fill in a worn area of the shaft. I baled around 75 square bales of hay after I put that bolt and lug type taper nut on with no problem
 
I used a 1/2" bolt on mine when it broke about 5 years ago. I always thought it was a shear bolt too. Pretty much figured if it weren't it would either have splines or some sort of key to do the holding instead of just a bolt. Mine's a WD not a 45 but I do believe they are both the same and they do tend to get wallowed out after 50 or 60 years of use don't they. Keith
 
I've sheared a lot of them so I guess it was misnamed from the factory.And its definitely the least expen$ive thing in the PTO drive line to replace.A neighor got tired of replacing the bolt on his WD45 PTO shaft so he put in a grade 8 bolt, busted the PTO gearbox and the housing it bolts to.
 
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