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PTO rear shaft seal

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Dusty B
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PTO rear shaft seal

Postby Dusty B » Sat Jul 16, 2016 7:32 pm

Just started leaking recently - any tips on how to make the job easier?? Would guess it's pretty straight forward project (but I've had those go bad before too! LOL!) Dusty B
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
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Glen
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Re: PTO rear shaft seal

Postby Glen » Sun Jul 17, 2016 5:55 pm

Hi,
I guess you are wanting to remove the PTO to change the seal.
On my Cub, I have to remove the PTO shifter guide bolt, on the corner of the trans cover, so the PTO lever will go farther ahead. The PTO shaft won't come out without the PTO lever going farther ahead than normal.
If the PTO bearing is loose or noisy running, you could replace it while you have the PTO out.
The PTO pilot bushing in the end of the long trans shaft, has to be good. It could be worn and need replacing. Also the front small end of the PTO shaft has to be smooth too, it goes in the bushing.
If the bushing needs replacing, Scrivet has said that he has drilled them out with a long drill bit from the rear of the tractor. I don't know the drill size, you can measure the OD of the new bushing to see. TM Tractor has the new bushing.
Grease in the bushing, and the end of the shaft before putting it together.
The IH service manual says remove the trans oil filler plug and look in the hole with a light to put the PTO back in again, and mesh the shifter with the PTO clutch. I have done that, it makes it much easier.
When you put the bolt back in the corner of the trans shifter cover, adjust the PTO shifter guide so the PTO engages as much as it can, the guide has to be back, not ahead, as much as it will, and still shift smoothly. Good luck. :)

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Dusty B
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Re: PTO rear shaft seal

Postby Dusty B » Tue Jul 19, 2016 8:04 pm

Don't really want to remove the PTO - just replace the rear seal! Is all that process necessary to just replace the seal?? Dusty B
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

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Glen
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Joined: Mon Mar 19, 2012 7:33 pm
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Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: PTO rear shaft seal

Postby Glen » Tue Jul 19, 2016 9:36 pm

Hi,
I haven't read on here if anyone has used something like an automotive dent puller to pull a seal out of the PTO. I'm not sure if it would work, the old original seals are thick, so they don't come out easy usually, unless you happen to have one that comes out easy.
Nobody else wrote here but me, don't know if the experts have a way to do it or not. :)

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dgrapes59
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Re: PTO rear shaft seal

Postby dgrapes59 » Wed Jul 20, 2016 9:45 am

Dusty,

Removal of the PTO shaft sure makes it easier in my opinion. I forgot to replace the PTO seal when I had my shaft out; I replaced the gasket, but forgot the seal. It was a 5 minute job, if you hold your mouth right when putting the shaft back in to align with the lever. :wink:

Good luck,
David

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Dusty B
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Re: PTO rear shaft seal

Postby Dusty B » Wed Jul 20, 2016 1:03 pm

OK - we'll see how it goes! Thanks, Dusty
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

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Re: PTO rear shaft seal

Postby brichter » Thu Jul 21, 2016 8:00 pm

Dusty, I changed out my pto seal but I just screwed a sheet metal screw in the old seal then pulled it out with a small crowbar then put in the new seal.
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Dusty B
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Re: PTO rear shaft seal

Postby Dusty B » Fri Jul 22, 2016 8:22 am

Wonder what went "clunk" when I pulled the shaft out?!?!?!
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!

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Slim140
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Re: PTO rear shaft seal

Postby Slim140 » Fri Jul 22, 2016 8:39 am

Dusty B wrote:Wonder what went "clunk" when I pulled the shaft out?!?!?!


My guess is the piece that the PTO shifter leaver goes in, the set screw may have been loose on it and it fell off. You will have to pull the plate off the back of the transmission to get to it.
Last edited by Slim140 on Mon Jul 25, 2016 11:24 am, edited 1 time in total.
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Glen
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Posts: 6096
Joined: Mon Mar 19, 2012 7:33 pm
Zip Code: 00000
Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
Circle of Safety: Y
Location: Wa.

Re: PTO rear shaft seal

Postby Glen » Fri Jul 22, 2016 6:27 pm

Hi,
It could have been the PTO clutch, it is called, fell off the PTO shaft, like Cub said above.
Here are pics from the Cub service manual showing how it should look, the clutch is held on the shaft by a setscrew, and should not fall off the shaft. The setscrew should turn snugly into the hole, so it doesn't fall out, but can't be tight on the shaft, so the clutch can slide on the shaft. It has to be turned so the setscrew in on the flat area of the shaft.
If it fell off, you can reach the PTO clutch through the rear of the trans, don't remove the gear shifter, if that's what Cub meant above, the PTO is not in the trans under the shifter plate.
If the clutch fell off the shaft, you might want to drain the trans oil to find it, unless you want to reach down in the oil.
When you change the seal is a good time to clean out the old grease between the bearing and seal. The new seal is probably thinner than the original one. I use the grease gun on the fitting, and pump the unit full of grease, until it comes out around the front shield, by the bearing, before putting the assembly in the tractor, then I can see how much grease I have put in it. :)

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User avatar
Dusty B
10+ Years
10+ Years
Posts: 1880
Joined: Wed May 23, 2007 7:35 am
Zip Code: 61736
Tractors Owned: '45 SC Case
Circle of Safety: Y
Location: IL, Downs
Contact:

Re: PTO rear shaft seal

Postby Dusty B » Sat Jul 23, 2016 1:53 pm

Those are a big help Glen - evidently the set screw in the shifter clutch was so loose it let the whole shifter clutch drop off and down into the differential!! OH the joys of Cub tractors, right??!!! Thanks guys, if it cools down some just may get it back together in a week or so! Dusty
Grandpa's '41 B
'56,,'57,'59, Cu'b
'45 C
'55 Case S
Dad's DB garden tractor
'48 DeSoto
'31 "A Coup
'79 Lincoln TC
God looks out for those of us who don't know how to look out for ourselves!


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