Rebuild of my 8030 went pretty well, all except the front seal (74036340) developed a leak within the first hours and were going to have to go back in. 

Is there anything unique about this seal? pics I'm seeing kind of look different than what I'd expect; also seeing what look like a simple rubber seal or one with felt in it. Depends on the manufacturer. Which one would be the best to put back in there? Pretty sure it was an AGCO supplied seal, or one from the kit which was a Reliance Kit

Shop that did the rebuild is going to pull and replace the seal just wondering if there's any tips or tricks with it maybe I could pass on. 

It could also be a leak really close to the seal area we'll have to rule out first, but oil is coming out behind the balancer somewhere. 

Thanks, Matt