Hi all, Having opened up the cab, I notice the top of the Sundstrand drive pump is really clean looking. Apparently that is where I am leaking some hydraulic oil. I'm curious to know how difficult it would be to replace the seal as it is starting to use a bit of oil. It's a relatively low hour machine (2100 hours) for its age( 1996) and would like to keep it in good repair. Also curious to know if there is a drain hole on the 853 as the leaking oil has been accumulating down below. The chain case is not over full so the drive pumps are apparently fine and the machine still operates perfectly. Hopefully the problem is an o-ring or similar... thanks, Burt