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1944 B PTO Shaft Hole Size and Adapter
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Dean (West MI) View Drop Down
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Joined: 12 Sep 2009
Location: West Michigan
Points: 1277 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dean (West MI) Quote  Post ReplyReply Direct Link To This Post Topic: 1944 B PTO Shaft Hole Size and Adapter
    Posted: 21 Jun 2010 at 6:24pm
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I recently purchased a slipper type clutch, PTO adapter for my 1944 Allis Chalmers B.  This mechanism coverts the PTO shaft from 1-1/8" to 1-3/16" and has a built in clutch that engages when I press the foot clutch so that the Bush Hog doesn't keep pushing the tractor forward.  The only problem is the hole in the B's PTO shaft is 3/16" while the pin size for the adapter is 5/16".  Does anyone make an adapter that uses a 3/16" pin or do I simply drill out the hole in the B's shaft to accept the larger 5/16" pin?

Thanks in advance for any insight.
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Chalmersbob View Drop Down
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Joined: 11 Sep 2009
Location: Pennsylvania
Points: 2122 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Chalmersbob Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jun 2010 at 9:56pm
Just use the bolt that fits the PTO shaft. It only holds the devise on the shaft, the splines do the hard work.  Bob
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steve(ill) View Drop Down
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Points: 82826 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jun 2010 at 10:34pm
i agree.. your adaptor goes from 1-1/8 to 1-3/8 inch splines. the pin just holds in on. if a 3/16 pin is all you can get in, thats o.k.  i have seen cotter pins used on some tractors. dont have to be a roll pin or bolt.
Like them all, but love the "B"s.
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CTuckerNWIL View Drop Down
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Points: 22823 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CTuckerNWIL Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2010 at 7:44am
Use the smaller bolt that fits the tractor PTO shaft. Just make sure your telescoping driven shaft slides freely front to back.
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Dave(inMA) View Drop Down
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Joined: 12 Sep 2009
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Points: 2398 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave(inMA) Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2010 at 8:20am
Agree - the extra room in the adaptor hole will only add (maybe) some extra telescoping action which is not an issue. The pin only makes sure that the adaptor won't slide off - the splines do all the work to drive the implement.
WC, CA, D14, WD45
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Dean (West MI) View Drop Down
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Points: 1277 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dean (West MI) Quote  Post ReplyReply Direct Link To This Post Posted: 22 Jun 2010 at 10:04am
Thanks for all of the replies, I never thought about using a pin that would fit the PTO shaft.  That's why this site is the best!


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