Pto shaft slid in. Won’t disengage.

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J3 Driver
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Pto shaft slid in. Won’t disengage.

Postby J3 Driver » Sun Dec 27, 2020 6:00 pm

8EB577C0-89DF-4887-B21D-9170E9B9B6B3.jpeg
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My son was used his cub today and while using it with his flail mower the pto shaft skid forward about a 1/4” and wouldn’t disengage. I grabbed ahold of the shaft and pull on it and it slide out about a 1/4 inch and then everything appeared to work normally.
Looking at the parts book and service manual I see thinks to hold the shaft from sliding out but nothing to keep it from sliding in.

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Don McCombs
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Re: Pto shaft slid in. Won’t disengage.

Postby Don McCombs » Sun Dec 27, 2020 6:12 pm

The PTO shaft bearing has moved from it’s staked position.
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tst
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Re: Pto shaft slid in. Won’t disengage.

Postby tst » Sun Dec 27, 2020 7:10 pm

early pto shafts had the bearing staked in place, was updated by a shaft with a snap ring

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Dale Finch
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Re: Pto shaft slid in. Won’t disengage.

Postby Dale Finch » Sun Dec 27, 2020 8:56 pm

If/when you rebuild the PTO, this might help:
http://farmallcub.com/phpBB2/viewtopic.php?f=1&t=100075
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Gary Dotson
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Re: Pto shaft slid in. Won’t disengage.

Postby Gary Dotson » Mon Dec 28, 2020 8:25 am

For the PTO shaft to slide in, it has to be a failure of the snap ring, holding the bearing in the housing, or a failure of the bearing, itself.

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Dale Finch
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Joined: Tue Apr 27, 2010 11:34 am
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Tractors Owned: '51 Cub #140966 "Bruno" with Woods 59 mower
'55 Cub #187541 "Betty" with Fast Hitch
'55 Cub #190482 "Ben" with Woods 42 mower
'55 Cub #191739 "Bertha" with Woods 42 mower
'56 Cub #194370 "Boris" with Mott Flail mower
Circle of Safety: Y
Location: NC, Chapel Hill

Re: Pto shaft slid in. Won’t disengage.

Postby Dale Finch » Mon Dec 28, 2020 9:37 am

20201205_140317 (Small).jpg

I can't see that the loss of the staking OR the failure of the bearing retainer ring would allow for the shaft to move FORWARD. There is a widened shoulder on the shaft behind the bearing.

The only way I can see the PTO shaft moving FORWARD is if the set screw on the clutch collar backed out, allowing the collar to move farther back than usual, disengaging the two shafts from each other.

But it's much more likely the sequence of events is backwards...shaft moved aft (due to staking or ring retainer failure) and pushing it IN got it working again... :?

I am really curious to see what you find when you pull the PTO...please take lots of pictures.
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