Differential Shaft Inner Bearing Oil Seal

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andersonbw
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Differential Shaft Inner Bearing Oil Seal

Postby andersonbw » Sun Dec 30, 2018 7:05 pm

I'm have the final drives off and have noticed some leakage from the oil seals on the differential. See the pics. Can these seals be replaced without removing the bearing retainer?
differential shaft bearing seal 2.jpg

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Dale Finch
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Re: Differential Shaft Inner Bearing Oil Seal

Postby Dale Finch » Sun Dec 30, 2018 7:16 pm

Yes, easiest with a seal puller, but you can pry it out. The right one, as you probably see, is down the axle extension, so you have to remove that to get to the seal.

Make sure you remove any burrs where the seal sits/inserts, or you might cause a leak. If you have the finals off, you can also replace those seals, too.

BTW, have you checked your transmission gear oil level? If it is too high, you will probably still leak past those seals. Transmission only holds 3 1/2 PINTS. You can at least check the level by removing he LEVEL PLUG, on the left side of the transmission...a small square plug. Remove that plug, and if fluid comes out, it is either overfilled, or has water in it floating the oil up. In that case, drain and start over with clean oil.

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Dale Finch
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Re: Differential Shaft Inner Bearing Oil Seal

Postby Dale Finch » Sun Dec 30, 2018 7:25 pm

In case you are unaware, you are only about 2 hours from a really great gathering of cub enthusiasts...DSCF (Deep South CubFest) in Sneads, Florida. Lots of fun, and a chance to learn just about anything cub related. Oh, and the food is great!!

Something you might check, in the photo above of the final, it appears that something has been hitting the bolt heads holding the retainer. (Or it could just be where the gunk was rubbed off!) This can happen if the brake drum has migrated and was spinning against those bolts.

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andersonbw
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Re: Differential Shaft Inner Bearing Oil Seal

Postby andersonbw » Sun Dec 30, 2018 7:28 pm

Thanks for the help Dale. The transmission level is good (no water hopefully).

I bough a cheap seal puller last year and promptly bent it up removing a seal from my other cub. I've got a slide hammer for pulling bearing races. I haven't used it yet. Think I can use that to pull the seal?

Bearing Race Puller2.jpg

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Dale Finch
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Re: Differential Shaft Inner Bearing Oil Seal

Postby Dale Finch » Sun Dec 30, 2018 7:34 pm

To be honest, I'm not familiar with that tool. One thing to point out, that seal is just pressed in flush without any shoulder in the housing behind it to keep it from going through into the final. So unless you are dismantling the final, be sure you don't push it further in.

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Dale Finch
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Re: Differential Shaft Inner Bearing Oil Seal

Postby Dale Finch » Sun Dec 30, 2018 7:36 pm

Does your tool work by screwing the center piece in, causing the smooth section to expand behind the seal? Then you pull it back out with the seal? If that's the case, it might work fine.

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andersonbw
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Re: Differential Shaft Inner Bearing Oil Seal

Postby andersonbw » Sun Dec 30, 2018 7:39 pm

I attended the DSCF last year and plan to go again this year. I brought my Cub with a John Deere (oh well...) 71 Planter converted to Fast Hitch. I got some great advice about how to set it up. The gentleman (sadly I don't recall his name but you probably know him) in the photo tutored me. Planted sweet corn this year with it. It worked great. I hope to see him there this year and give him a full report.

I haven't yet seen anything from Mr. E. Hope the Hurricane didn't cause him too much damage.
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Planter2.jpg

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andersonbw
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Re: Differential Shaft Inner Bearing Oil Seal

Postby andersonbw » Sun Dec 30, 2018 7:41 pm

The more you screw the taper in the wider the jaws expand. The small flange on the end will hook the back of the seal (hopefully) and pull it out via slide hammer. I haven't used it yet, but hopefully that is what will happen.

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Re: Differential Shaft Inner Bearing Oil Seal

Postby Dale Finch » Sun Dec 30, 2018 7:47 pm

Yeah, I just watched a video on the Harbor Freight tool...couldn't figure out how to link it, though. It'll probably work fine.

The "Plow Wizard" is Bill Hudson, a great guy who knows his plows!

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Re: Differential Shaft Inner Bearing Oil Seal

Postby ntrenn » Sun Dec 30, 2018 8:14 pm

Just picked up a pair of those seals myself for when I change out the finals to ones without broken bolt bosses...

Advance auto, national 450043, $6.99 each. Dealer wanted $14 something each...and they are generally better than that...

The puller should work just fine...pulled many with that same puller...

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Re: Differential Shaft Inner Bearing Oil Seal

Postby rockfarmer » Sun Dec 30, 2018 8:45 pm

andersonbw wrote: The gentleman (sadly I don't recall his name but you probably know him) in the photo tutored me. Planted sweet corn this year with it. It worked great. I hope to see him there this year and give him a full report.


You must be living good, because you had a mighty fine tutor there. Bill Hudson is his name, if my eyes are not deceiving me.

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Re: Differential Shaft Inner Bearing Oil Seal

Postby Glen » Sun Dec 30, 2018 10:19 pm

Hi,
While the final drive is off, I like to replace both oil seals, if they haven't been replaced lately.
There is a seal behind the brake drum, in the final drive casting.
If either seal leaks, oil will probably get on the brake lining.

You have to remove the brake drum, and it's key in the shaft, then remove the round cover at the end of the shaft, held on with the 4 bolts, then slide the shaft out, to the left, viewed from when it would be assembled on the tractor.
Then you can get at the back side of the seal with a hammer and punch.

Tighten the brake drum set screw securely when putting it together, there have been posts on here showing that they came loose.
Below is the seal at TM Tractor, you can see it there. There is a pic of the final drive parts below the seal pic. They have the other seal, and gaskets also.

http://www.tmtractor.com/new/df/044fp.htm

Below is a pic of a final drive and the seal. :)
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Cub brake.jpg

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Re: Differential Shaft Inner Bearing Oil Seal

Postby wrz » Mon Dec 31, 2018 10:52 am

To remove a seal take a sharp awl and punch two holes 180 degrees apart on the metal flange edge and screw two sheet metal screws in the holes. The next step is to take a cats paw and and pry a little on each side and it will work it out. The trick is to just make the holes big enough for the screw to start to thread in. If you use a drill to make the holes the metal chips can become a problem. I have done this to remove the seal on the distributor side of the governor.
Wm

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Re: Differential Shaft Inner Bearing Oil Seal

Postby jsfarmall » Mon Dec 31, 2018 1:42 pm

Man just take 3 bolts out and that retainer comes and much easier to work with. Put the 3 dollar o ring in there too while it's apart. not hard at all just keep up with the shims. Worth the extra 3 dollars and couple minutes.
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Dale Finch
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Re: Differential Shaft Inner Bearing Oil Seal

Postby Dale Finch » Mon Dec 31, 2018 2:21 pm

Yes, the right retainer isn't too hard to remove (once you have that axle extension off), but that left one is recessed, and I had a bear of a time getting one out! :?


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