Thank you guys. This steers me in the right direction. Looking for a temporary fix to run it this week, followed by a long term. Sounds like long term fix will be pricey but would like to do it right when i tear them down. I'll post results of temporary fix. It's not a really bad leak so far, but have only ran for aprox 10-15 min.
D4 6U Caterpillar Dozer