John Deere B PTO seal

[ken44520978]

I am replacing the PTO seal on a 1946 B serial # 188XXX. The old seal is quite wide compared to the new seals. I remember reading about using two seals when replacing an old one. What I question is how would the outer seal get lubrication if the inner seal is doing it's job? Seems like it would run dry and be short lived.

 

[lstra]

Pack grease between the two seals.

 

[Pete in MD]

I am replacing the PTO seal on a 1946 B serial # 188XXX. The old seal is quite wide compared to the new seals. I remember reading about using two seals when replacing an old one. What I question is how would the outer seal get lubrication if the inner seal is doing it's job? Seems like it would run dry and be short lived.

Yes, you use 2 new seals to replace to replace the original wide seal. When installing the new seals make sure the garter springs face Away from each other. Put some grease between the seals as Istra said.

Chicago Rawhide CR13602 is a substitute seal you can get at a good auto parts house.

If the old seal cut grooves in the pto shaft, you can install a Federal Mogul Redi-Sleeve #99138 to give you a good surface for the seals to ride on.

 

[Resting Relic]

Hey,
As others have said you use two seals, inner one lip in, outer lip facing out. Pack grease between them. I've done a lot of them that way and it works well. Good Luck! John

 

[J.Wondergem]

Hey,
As others have said you use two seals, inner one lip in, outer lip facing out. Pack grease between them. I've done a lot of them that way and it works well. Good Luck! John

That's the way I've done them, but have not done a JD B.

 

[ken44520978]

Thanks for all the replies. I will install two seals facing away from each other with grease between them as recommended. I am not questioning your wisdom just curious. Does the outer seal face away from the first seal to help keep dirt out? Since the differential isn't pressurized I suppose it still helps limit leakage if the inner seal seeps a bit. It is funny how much there is to learn while working on tractors built before my time!

 

[Pete in MD]

Thanks for all the replies. I will install two seals facing away from each other with grease between them as recommended. I am not questioning your wisdom just curious. Does the outer seal face away from the first seal to help keep dirt out? Since the differential isn't pressurized I suppose it still helps limit leakage if the inner seal seeps a bit. It is funny how much there is to learn while working on tractors built before my time!

The outermost seal keeps air out of the pump.
The inner seal keeps oil in it the pump.

 

[ken44520978]

OK, now it makes sense to this feeble little mind! Thanks to all for the help!

 

[Baseball Fan]

Sorry to resurrect an old thread but I need to do this same job on my '49 A. Does the transmission fluid or PowerTrol need to be drained before doing this? Thank you in advance and sorry again for bring up an older thread.

 

[ken44520978]

The hydraulic oil needs to be drained only. There is another seal inside that separates the gear oil from the hydraulic oil. I drained the hydraulic oil, then waited a few days for the seals to come in the mail. No gear oil came out so i knew the seal between the two was good.

 

[PJH]

I am replacing the PTO seal on a 1946 B serial # 188XXX. The old seal is quite wide compared to the new seals. I remember reading about using two seals when replacing an old one. What I question is how would the outer seal get lubrication if the inner seal is doing it's job? Seems like it would run dry and be short lived.

While doing a complete overhaul, I replaced the PTO seal on my JD 50. It has always been my goal to have a leak-free tractor, and at last I was successful! The first time that I ran the tedder behind it, it wrapped the shaft with hay and ruined the brand-new seal.