Leather seals vs. rubber seals

Leather seals vs. rubber seals
 

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 Re: Leather seals vs. rubber seals in reply to WVSteve, 01-08-2002 20:55:46   Guys, I've been in these seal discussions before and here's how I see it...two seals doubles your expense!! These new seals with their technological advances will outlast any leather seal..ie..crankshaft seal in an automobile..3-4000rpms daily ,several hundred thousand miles..darn few ever leak..look at the technology and where it is being used in the auto industry..and in brand new agricultural products. My local Case-IH dealer has been in it for over fifty years and I asked him one day what he thought of putting two seals in place of one..he just smiled. He did say to always place the new seal on a part of the shaft the old one didn't run in..they do groove the shafts after fifty years and following this advice I have always got a good fit. I'm not saying anyone is wrong putting two seals in, it guarantees the fix but it does double your cost. Having done seals on two H's I have not had one fail me yet and I use only one seal per application. Good luck to you seal installers from Mike in Exeter Ontario

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3588 Transfer Case Flywheel Shaft Oil Seal Leak

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Rear Main seal Leak - L4240

There's a real good chance it's the front wheel assist (what most call 4x4) propeller shaft.

A couple things typically go wrong that cause the leak. First the seals will leak and second the collars that the seals ride on are rubber on the inside where they seal to the shaft, and the rubber shrinks and then some clearance opens up between the shaft and collar-causing a leak. Oil then runs into the bellhousing area and usually out of the little pin plug.

The fix is to replace both collars, shaft, and seals. This is considered a permanent fix. Some just replace the seals and that's only part of the fix. The tractor has to be split to gain access to these parts, thus its a good idea to consider doing it right once as opposed to half way doing it twice or more.

When removing the propeller shaft from the transmission case, sometimes the collar falls off inside the transmission case. Don't have a coronary, a long magnet fishes it out pretty easily and then you can usually put some grease on the transmission side of the collar, slide the "dry" side onto the propeller shaft, slide it onto the transmission and the grease will hold it well enough so that you can slide the propeller shaft back out. The thicker the grease the better obviously and you don't have to use the whole tube, just enough to coat the splines.

So what causes it?

A lot of times junk hydraulic fluid. It causes the inner diameter of the seal collars to shrink more than UDT or Super UDT does. Also severe heating of the transmission can cause it, which I see more on the HST's than the DT's or GST's; especially when using the HST in high range for moving dirt, gravel, pushing trees, etc.

Another possible leak is the input shaft of the transmission, which is fairly rare.

The rear main seal leaking is REALLY rare. Kubota did a good job on that part for sure. I can't say I've ever seen one leak that didn't have other problems.