The difference in seals

Mike CA · Sep 25, 2009

I replaced the forward tranny seals on my '44 H already, and it was much the same. Here is the old and new seal for my PTO shaft. The difference is astounding! Were the older seals better, since there was multiple seal layers, or is the new technology (the seal material I suppose) that much better that only one lip is required?

J.J. from Afton · Sep 26, 2009

Ya its not so much efficeincy between the two its just the different standards of making them between than and now. Newer ones youll often see only about half the metal housing as compared to old for one example. So the depth and what not has been changed due to cost to produce them and technology/design between than and now. Least that is my understanding.
Occasionaly youll see people double up the new seals where there is more than enough space such as some transmission or axles seals. Its all just a matter of personal opinion.

-Jordan

PaulW_NJ · Sep 26, 2009

My understanding is that the newer seals don"t have to be as thick because the synthetic seal material has better performance. Some of the original seals I"ve removed from my tractors appear to have been leather. While I"ve heard of using two seals to make up the original width, that apparently is not a good idea because a seal needs to have lubrication to prevent it from drying out. In a tandem arrangement the outer seal doesn"t see any oil. A secondary advantage with the narrow seal is that it gives you a little bit of option to now pick the best shaft surface, in case there has been some deterioration.

TomH in PA · Sep 26, 2009

Mike -

Here's the 30lb tire

pete 23 · Sep 26, 2009

The new seals are superior and I don't use two as was pointed out they need lubrication to last. Old double style was almost impossible to misalign when installing but the new thin one this can happen very easily, then it will leak. Must be perpendicular to shaft with in about .020

Gmercer · Sep 26, 2009

I just came across this post and thought I should reply. I'm replacing the oil seals on my 1941 M farmall and I thought I got the wrong seal when I compared it to the one still in the housing. Until, I saw your post. These must be the new replacements. However, I paid over seventeen dollars for this, what I call a common everyday oil seal which should cost far less than that. IH Case must be charging the price of the original seal for a cheap replacement. At least , thats what I think. In the future, I will be going to local bearing and seal suppliers with the original for measurements for all my seal needs. G,mercer,,Spearfish, SD

Bob Kerr · Sep 26, 2009

The old seal was made from rawhide and is very durable. well I mean if they just now failed then "durable" should follow MEGA. The new seals are cheaper to make and are still very durable but will get hard over the years where a raw hide seal will not. One thing to note here is since these seals are both durable, then why did they go bad. I have found it is usually a bearing that used to keep a shaft steady is now letting the shaft wobble a little bit and has worked the seal surface out of round. another cause is very dirty oil which would grind the seal surface (and also cash in the bearings). Be sure to check those bearings on the lower and upper trans input, It seems to be a common failure. I know of a one owner H right down the road from me that had them go bad when the tractor was 15 years old. They are small bearings but take a lot of turns.

The difference in seals

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Mike CA

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