753 hyd oil going directly to chain case

[bttpe]

My 753 seems to pass oil directly into the chain case. I just replaced both carrier seals even though the old ones looked good. What happens is I put hyd oil into the reservoir and after driving forward a couple minutes all that oil has been pumped into the chain case (I assume because the chain case is full). I have not pulled the return line filter from the motors to the reservoir I'll do that tonight. I rebuilt one motor even though I don't think it needed it. When the reservoir has fluid it works great....just doesn't last very long.

 

[Tazza]

Check your case drain filters, if they are plugged, it will build pressure and push into the chain case.
You did the obvious, changing the carrier seals, the only other thing i can think of is the case drain filters.