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Demoralized, Hub seals leaking AGAIN!!

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Peter Knowles

07-02-2000 20:30:40




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Two weeks after replacing the seals on my '48 8N I suddenly have no brakes again!. After much reading and preparation I disassembled, cleaned, re-assembled with silicone gasket goo between every face. Installed new seals, also with silicone. New shoes and WOW I was in heaven. Now I can't believe they're leaking already, both SIDES!! What could I have done wrong?
The surface the seal rides on inside the hub was slightly grooved but not pitted or rough in any way. I'll do it all over but I sure want to get it right this time!

Peter Knowles

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Dell (WA)

07-03-2000 00:27:37




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 Re: Demoralized, Hub seals leaking AGAIN!! in reply to Peter Knowles, 07-02-2000 20:30:40  
Peter..... .I had one ol' time tractor mechanic, claim the proper treatment for leaking rear seals it to run about 1 qt low. Your axle bearings don't need a oil bath to live, just some good tractor wheel bearing grease. You really don't need all that hydralic fluid to operate, its mostly 5 gallons of heat sink instead of a hydraulic radiator. I'd get 2 cans of brake cleaner spray, clean the shoes and run 1 qt low..... ...Dell

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Peter Knowles

07-03-2000 05:14:22




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 Re: Re: Demoralized, Hub seals leaking AGAIN!! in reply to Dell (WA), 07-03-2000 00:27:37  
Dell,

Seems sensible, but the flare at the end of the axle housing would hold a fair amount of oil especially when refilled daily due to my hilly terrain. It seems the rather severe "Fill the axle housing with silicone" may be the best defence, but oh so well, "severe"

Peter Knowles



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The8Nman

07-02-2000 22:25:48




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 Re: Demoralized, Hub seals leaking AGAIN!! in reply to Peter Knowles, 07-02-2000 20:30:40  
The biggest cause of properly installed new seals leaking is a loose preload on the axle bearings. If the axle bearings are a little loose the axle centerline will move upward and the seals cannot distort enough to maintain a positive seal.



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Peter Knowles

07-03-2000 05:23:07




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 Re: Re: Demoralized, Hub seals leaking AGAIN!! in reply to The8Nman, 07-02-2000 22:25:48  
Hmmm,

Now this may be the likely culprit.
I intended to preload the bearings exactly as dictated. However after finishing one side the preload was a bit tight. Having plastered every mating surface with silicone gasket I didn't want to take it apart to add a shim. I assumed I could adjust the preload from the other side. After all the axle shafts butt, end to end. Do you see a problem with this? I suppose now both axles, hubs, drums and wheels are one shim thickness to one side but even with the seal riding on a new spot on the hub the shift is minute and shouldn't make a difference. Or should it?

Peter Knowles

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Dell (WA)

07-03-2000 05:44:08




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 Re: Re: Re: Demoralized, Hub seals leaking AGAIN!! in reply to Peter Knowles, 07-03-2000 05:23:07  
Peter..... You really don't want those axle shafts to touch in the middle of the differential. It won't give you a "limited slip" differential (grin). The axle shaft is what they call a "floating" shaft design, in that the axle shaft does not take any weight, you can remove the axle and the tractor wheel still suppports the weight.

You might want to check the "archives" at the top of the pages. There has been several good threads on differential adjusts via the shim pack. ..... Dell

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Peter Knowles

07-03-2000 06:25:30




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 Re: Re: Re: Re: Demoralized, Hub seals leaking AGAIN!! in reply to Dell (WA), 07-03-2000 05:44:08  
Dell,

I'm certainly new to these N's but my '48 is definitly not a floating axle. The axle passes through a tapered rollerbearing and extends out where the hub attaches via a tapered spline. Take this axle out and the thing will fall over. Is it possible I have a different beast?
In fact the axles must touch each other, or at least bear on each other is some way through the diff, this is what keeps the preload on the tapered bearings.

Peter

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The8Nman

07-03-2000 09:00:16




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 Re: Re: Re: Re: Re: Demoralized, Hub seals leaking AGAIN!! in reply to Peter Knowles, 07-03-2000 06:25:30  
Peter, you are absolutely right and it is apparent you understand how to properly preload the axles. You need to pull the drum off and see exactly where the gear lube is leaking from. You've done everything right, but somewhere you've missed something. New seals, properly installed with sealer on the joint faces, a good hub surface, and proper preload on the axles, will not leak for quite some time. When you see where the gear lube is leaking from, it should become obvious what you need to do to fix it. Please don't pump the axle housing full of silicone sealer. Sooner or later pieces of it will gravitate into the hydraulic pump and you'll have bigger problems than leaky seals.

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Peter Knowles

07-03-2000 09:05:10




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 Re: Re: Re: Re: Re: Re: Demoralized, Hub seals leaking AGAIN!! in reply to The8Nman, 07-03-2000 09:00:16  
Yup I'll have a look.

Bummer is that I did the previous work by removing the hub and drum together. Now to check the seal properly I'm going to have to seperate the hub and drum....

Thanks agin

Peter



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