I'm not sure I would do that. I grease my whole tractor every week but I also mow a solid 4 hours every week in a sandy environment. Most of the gravely setup (at least on my 816S) is so that as you add grease you push contaminates out. This is how the steel seals work, the wheels on the deck, etc. For my peace of mind.. I'll throw a little in on or before the schedule.
In my opinion, Grease is cheaper and easier than broken down on Saturday afternoon.