The front tires on my x730 with ~900 hours were done, so I took the wheels off yesterday & had new tires mounted. I noticed that there are no zerks on these wheels. It seems like the “axle” the wheels mount to ought to be lubricated occasionally, though. Should I just apply a light coating of grease or is there some reason that’s a bad idea? JD manual under “service lubrication” does not indicate this area for lubrication.