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Farmall & IHC Tractors Discussion Forum
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Super-A PTO pulley seal removal??

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peter llanso

05-16-2004 14:19:57




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Just bought my first tractor, and I have a badly leaking seal on the pulley shaft, though the PTO shaft is fine. (I want to use the tractor for a pull-behind mower)

Alas, the 'shop manual' I got from the guy that sold 'er to me doesn't have an exploded-diagram. I have the end plate off that contains the seal. The seal, however, seems to be sandwiched between two metal cups. Do I just 'tease' the outer cup loose, to get at the seal? I don't want to booger anything up. Dang, I need to get mowing!!

Moreover, it doesn't seem like the seal is sufficiently 'inboard' to get the seal onto the smooth part of the shaft and off the splines. Might have been part of the problem. If there ARE a pair of cups, is it kosher to move the inboard one closer to the bearing?

Thanks

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Haas

05-17-2004 05:44:14




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 Re: Super-A PTO pulley seal removal?? in reply to peter llanso, 05-16-2004 14:19:57  
I assume you are talking about the belt pulley shaft seal. This seal is held(pressed in) in a seal holder that is attached with three bolts to the belt pulley housing. All you do is take out the three bolts and the seal holder should slide right off. The seal does not run directly on the shaft, but rather on a bushing that goes over the shaft. The bushing clamps the bearing inplace on the shaft when you install the belt pulley and clamp it with the bolt in the end of the shaft. If the pulley is not in place, you must install a cover over the splined shaft in place of the pulley to clamp the parts in place. If you don't do that you will lose the bushing that the seal runs on. On my C, someone replaced the seal with one that ran directly on the shaft. In that case, nothing to hold the bearing in place except the seal. However it did not leak until I put it back like it was designed. My experience, nearly impossible to get these pulley assemblies completely leak free, especially if you are going to use them.

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peter llanso

05-16-2004 15:25:16




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 Re: Super-A PTO pulley seal removal?? in reply to peter llanso, 05-16-2004 14:19:57  
CNKS,
Thanks for the quick reply. From the inside out:
There's the body of the PTO unit, then a gasket, then a metal plate maybe 3/16 thick, and the bearing is flush with the outer edge of that. (I didn't remove that.) Then another gasket, then the end plate I have before me. Within that end plate, from inside out, I see a metal cup, then the seal, (whose rubber is so worn the spring is about to fall out), (but maybe that inner metal is PART of the seal), then a metal spacer(?) about 1/8 thick, then what appears to be a felt(?) ring, then the outer cup. Until I pop something loose, I can't tell what is what. And the new seal I got from Case-IH looks dramatically different, though the inner and outer diameters look right. Moreover, there's a pulley spacer(?) that rides over the splines, and the seal actually rides on THAT, rather that the shaft itself. I can slide that spacer in and out. The seal actually doesn't ride on the SHAFT.
Man, I'm confused. Just for starters, does one remove the seal from inside the end plate, or the outside?

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CNKS

05-16-2004 17:29:38




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 Re: Re: Super-A PTO pulley seal removal?? in reply to peter llanso, 05-16-2004 15:25:16  
It's been a couple of years since I did one of those, need to do another one. When I put the 1st one together, I thought it would leak, it didn't, or maybe just a seep. The new seals are completely different, but they are better. Since they are so thin, you may be able to use two, if there is room. Be sure the lip of the seal faces inward towards the oil. If you can't drive the seal out from the back, just dig it out, but don't scratch or otherwise damage the retainer. The seal has a metal backing with it, it will come out with the seal. In order, from the inside out, my parts book shows 3 shims (I believe the number can vary, just use your old ones), then the inner bearing cup, bearing, gasket, seal, spacer, as you say I think the spacer rides inside the seal. It does not list a felt washer.

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CNKS

05-16-2004 14:31:09




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 Re: Super-A PTO pulley seal removal?? in reply to peter llanso, 05-16-2004 14:19:57  
The bearing is sandwiched between the cups, the seal fits in the outside of the outer one. Perhaps yours is missing, thus the bad leak.



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