1952 Ford 8N pto slipping out of engagement

nicko-31 · May 29, 2022

Greetings all, as of late my 52-8N has been slipping out of PTP engagement while using the Bush Hog only. It does not disengage on it's own while using other attachment's such as disc, rake Etc. any suggestions as too look at ? Regards

Richard G. · May 29, 2022

Check the pin that holds the engaging lever to the shaft.
See if there is much play.

Bruce (VA) · May 29, 2022

In no particular order.........

A loose PTO bearing.

A badly worn bearing

A broken or missing snap ring groove in the PTO bearing housing

The PTO coupling splines can also be worn and cause it to jump out of gear too, but that's rare.
75 Tips

nicko-31 · May 30, 2022

(quoted from post at 18:37:50 05/29/22) In no particular order.........

A loose PTO bearing.

A badly worn bearing

A broken or missing snap ring groove in the PTO bearing housing

The PTO coupling splines can also be worn and cause it to jump out of gear too, but that's rare.
75 Tips

I will look into that. Thank you. Any post on replacement for the bearing. ?

Bruce (VA) · May 30, 2022

It's a PITA. Most folks just buy a replacement shaft w/ the seal. bearing, etc already installed.
75 Tips

Ultradog MN · May 30, 2022

Probably the most common cause of the pto
slipping out of gear is the snap ring in
the bearing retainer has been pushed out of
place. And the most common cause of That is
the telescoping driveshaft on the mower is
too long.
If you watch closely when you raise the
mower the lifting pushes the telescoping
driveshaft forward slightly. It is the
geometry of it all.
Having too long of a drive shaft is often
compounded by the need for an ORC (over
running clutch).
The fix is to first, replace the snap ring
and second to check the length of the drive
shaft.
You want about 1/2 to 1in of freeplay when
the driveshaft relescopes to its shortest
length.
This advice holds true for pretty much any
tractor with 3 point hitch.
Fortunately on an N it usually damages just
the circlip or bearing retainer.
On other more complex tractors with
hydraulic pto clutches, too long of a mower
drive shaft can cause more severe and
expensive damage.

nicko-31 · May 30, 2022

. I removed the assembly and and the bearing looks good. The sleeves in front and behind the bearing on the drive shaft are giving me a reason to question due to the gap between the housing with the bearing. It is at least 1/4 of an inch of play between the two sleeves. Any thoughts ? I would like to post a picture if I can figure that out.

This post was edited by nicko-31 on 05/30/2022 at 11:09 am.

nicko-31 · May 30, 2022

(quoted from post at 05:30:49 05/30/22) It's a PITA. Most folks just buy a replacement shaft w/ the seal. bearing, etc already installed.
75 Tips

What would be the price Bruce ? and a link Please

nicko-31 · May 30, 2022

(quoted from post at 10:56:05 05/30/22) . I removed the assembly and and the bearing looks good. The sleeves in front and behind the bearing on the drive shaft are giving me a reason to question due to the gap between the housing with the bearing. It is at least 1/4 of an inch of play between the two sleeves. Any thoughts ? I would like to post a picture if I can figure that out.

So I have additional updates, Because of the distance between the inner sleeve that sandwiches the bearing between another sleeve on the other side of the housing I thought that this might make the shaft slide back and fourth enough to disengage the pto. I'm assuming that part. So I can't find any information as to weather there should be any play at all. So I'm going to order a new seal and gasket and give it a try,

This post was edited by nicko-31 on 05/30/2022 at 11:09 am.

Abbby · May 30, 2022

I think you should follow the path Richard has sent you on. Remove the inspection plate on the left side of the tractor - the one the lever is mounted to. There will be a shifter rail inside the rear axle housing that shifts the PTO collar in/out. Try moving the rail forward/rearward and see that it moves freely and the lever and pin are not worn too much causing slide collar from going all the way. Inspect the shift lever assembly mounted to the cover plate to ensure it is working properly. When reinstalling the cover and lever make sure the arm on the backside of the cover is installed into the groove on the shifter rail.

Richard G. · May 30, 2022

It is amazing how much play there can be where the lever goes on the shaft.
Easy to check.

nicko-31 · May 31, 2022

are you talking about the fork Richard ? Thanks

Richard G. · May 31, 2022

In my first post below, I was talking about the lever on the left side where the shaft comes out.
The lever is held on by a small pin and on my tractor there is a lot of play there.
Mine come out of gear occasionally and I just push it back in.
I am going to take the lever off and put in a new tighter pin.
The slop in the lever to shaft is not allowing me to completely engage the PTO.

deanostoybox · May 31, 2022

There should not be any end play in the PTO shaft.

For the cause see <a href=https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=nboard&th=1082625> Ultradog's reply in this thread</a>.

In your case the rear bearing retaining ring has been driven back a bit allowing the PTO shaft to move forward and backward. This can be fixed by driving the rear bearing retaining ring tight against the bearing, and shortening the offending PTO driveshaft on the offending implement.

nicko-31 · Jun 5, 2022

(quoted from post at 07:33:12 05/31/22) There should not be any end play in the PTO shaft.

For the cause see <a href=https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=nboard&th=1082625> Ultradog's reply in this thread</a>.

In your case the rear bearing retaining ring has been driven back a bit allowing the PTO shaft to move forward and backward. This can be fixed by driving the rear bearing retaining ring tight against the bearing, and shortening the offending PTO driveshaft on the offending implement.

I wanted to follow up on my findings, after I pushed the bearing retaining sleeve up against the bearing it's self thus not leaving any play between the bearing, I reinstalled and tested. All was good. Not coming out of drive any longer. Thank you for your help.

1952 Ford 8N pto slipping out of engagement

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