M95s DT front axle seal questions

   / M95s DT front axle seal questions #1  

Harry in Ky

Veteran Member
Joined
Jan 27, 2012
Messages
2,151
Location
Winchester Ky
Tractor
Allis Chalmers ED 40
Back on this M95 today. We have an oil transfer issue from the center main housing into the left side spindle unit. Parts book shows a seal and a bearing on each end of the center housing where the differential shafts mate with the spindle units. Removed the spindle unit, the bevel gear, and the differential shaft/bearing from the left side. This exposed the seal in question. Sure enough, it has a wrinkle in it, right where the shaft contacts the bottom portion of the seal lip. Okay, that explains the transfer.
It also brings me to the questions. First, why is this only a single lip seal? Secondly, if this is indeed correct, why would the lip face the spindle housing, since the oil I would expect it's designed to contain is in the center housing? Oil level on that side is much closer to the seal than the level in the spindle housing. This configuration may well be what engineers had in mind, but I'm not quite sure I want to put a new seal back in there facing the same direction just because I found it that way.
This tractor was purchased new, and has been on this farm ever since. According to the owner, no one has ever been into any part of the front end, and this is the first time it's given any trouble. The local small town dealer is of little help. I learned that the last time I went there with questions. Anyone out there care to think about this for a bit and maybe offer a thought or two?
 
   / M95s DT front axle seal questions #2  
If the lip in the seal has a wrinkle, I'd change it while it's apart.

Don't know what caused this, but if it's never been taken apart it must have come from the factory that way.
 
   / M95s DT front axle seal questions
  • Thread Starter
#3  
Whether or not to replace the seal was never in question. The decision here is which way should the seal face? The original seal was, in my opinion, installed backwards. It was however, in service that way for 10+ years without incident. Do I install a new seal in like manner, or do I face the seal lip in the direction that makes sense to me? I guess I will go the extra miles and visit another dealership to see what I can learn there.
 

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