I noticed last night that the right rear tire has fluid leaking from it. I pulled the tire and noticed I had bailing twine wrapped around the hub so I cut all of that stuff off. This morning I ntoiced the leak was still there from sitting overnight. The leak must be a slow leak becasue you can not see the fluid leaking. I notice it when the machine is parked overnight and there is fluid on the pavement in the morning. I am sure that there is some sort of seal but I looked at the whell last night and can't figure out how you would pull the hub off to get to it. My unit is a L555.