Farm Equipment - WD45 Shears PTO Bolts

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WD45 Shears PTO Bolts

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=33681
Printed Date: 11 Aug 2025 at 3:32pm
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Topic: WD45 Shears PTO Bolts

Posted By: John_B
Subject: WD45 Shears PTO Bolts
Date Posted: 11 Jul 2011 at 1:49pm

After shearing off 3 bolts where the PTO shaft bolts to the PTO gear drive, I took a closer look at the holes and discovered they are egged out in both the PTO shaft and the short shaft in the PTO drive. What would cause this? Have only run the PTO for a few hours since purchasing the tractor last summer, and this was to drive a 5 ft brush-hog. The brush-hog has a new slip clutch and pto shaft. I don't detect any up and down play in the rearshaft bearing either.

Replies:

Posted By: tractorboy
Date Posted: 11 Jul 2011 at 2:07pm

Are you using the correct bolt??? I had the same problem, "egging" till put the correct bolt in, can't remember where I ordered them from. The correct bolt has a larger shoulder than the threads are. Order at least 2, also if the egging is bad you may need to get that fixed, for the new bolts to help the situation.

Posted By: FHOliver
Date Posted: 11 Jul 2011 at 4:05pm

agco used to supply a weld on end for the pto shaft where you cut off the old end and weld on the new giving you a proper size hole. Use the correct bolt from acgo. Okie who used to post on here makes the replacement ends also and a lot cheaper than agco. If you want his number ill try to find it. He makes a nice replacement part. Havent seen him here for quite a while. Good luck

Posted By: norm[ind]
Date Posted: 11 Jul 2011 at 7:23pm

can drill a new hole at 90 degrees and use the corrct bolt might help some

1-574-342-4545 for help

Posted By: wfmurray
Date Posted: 11 Jul 2011 at 7:32pm

Drill hole one sixtenth over and put grade eight bolt in . Slip clutch should take care of machine . Clutch might be to tight.

Posted By: MACK
Date Posted: 11 Jul 2011 at 10:09pm

The tractor is only 54 years old or older. In the past 54 years i'm sure the PTO has been used alot so there is wear in both pieces.

Don't put a grade 8 bolt in there. Better to replace a shear bolt than all 4 gears and housings. MACK

Posted By: Ryan Renko
Date Posted: 11 Jul 2011 at 10:13pm

Amen Mack!!!! Bolts are really cheap compared to parts! Ryan

Posted By: Lonn
Date Posted: 12 Jul 2011 at 6:27am

I had the PTO stub shaft rebuilt and an old mechanic with a lathe make a new weld on sleeve for $20 for my WD and it works fine. The WD45 did have some trouble with blowing gear boxes so I was told by an old AC mechanic years ago. To get 540 rpm on a 45 you have to throttle back so that might save the gear box.

I'd hate to see what AGCO would charge for that sleeve. I bought a new sleeve 20 years ago from Deutz-Allis for something like $12 but I'm sure AGCO sees a lot more value in that sleeve today if you can still get it.

Oh no, forget I mentioned rpm and throttle back. LOL

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Posted By: JoeO(CMO)
Date Posted: 12 Jul 2011 at 6:33am

BOLTS are meant to shear, NOT GEARS and SHAFTS!

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Posted By: Tedin NE-OH
Date Posted: 12 Jul 2011 at 10:09am

If you use OEM bolt and start up slowly should have little problem

Posted By: Orange Tractors
Date Posted: 12 Jul 2011 at 8:08pm

The holes are egg shaped because in years past farmers used what ever bolt they had, even if it was too small.

Do not use a grade 8 or even a grade 5 bolt. It is a whole lot easier and cheaper to replace the shear bolts than to have to replace gears or cast housings.

What I use is a 7/16" grade 2 bolt, long enough that the unthreaded poortion fits all the way from one side to the other of the PTO shaft. Buy a couple of pounds of bolts and nuts and peen the end to keep the nut on.

Sometimes you can go all day without breaking a shear bolt, other days it seems like you can't even get the brushhog up to speed before one breaks.

Robert

Posted By: WD45
Date Posted: 12 Jul 2011 at 9:45pm

We have never had the pto bolt shear in any of our WD45's since 1984.

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Fred Dunlop, G,B,CA, WC,WF, 3 WD45`s,gas, diesel and LP,U,D10 series III, D12,D14,D15 SERIES II,D17 Series IV in Gas and Diesel ,D19 GAS and D21,170 185,210 ,220 an I-600 8070 fwd, 716H and 1920H