My trailer came with oil fill hubs. I ran them for 18 years without any bearing issues (ever). Last winter I decided to change out all the bearings and seals do to the age. As it turned out one of the oil fill set screws on one of the rear hubs had rusted really bad, to the point I couldn't get it out. Long story short, I ended up converting the rear wheels to grease.
I've ran the trailer for a little over a month. No signs of grease on the inside of the wheels. When I changed them over to grease I went with a bearing buddy that has the blue ring. Well, they fit really really tight inside my wheel hub opening, so last night I changed to a different bearing buddy with a smaller OD.
When I removed the bearing buddy's with the blue ring, water had got into the hub and milked up the grease. I tore them down, re-packed the bearings and put the other type bearing buddy's on.
My question, there was no inner seal leak, (no grease on the inside of the wheel) no sign anywhere that water was getting into the hub. Where could the water of got in?? Could it of came through the bearing buddy?? I added grease just like the instructions said to set a slight positive pressure.
I've done bearings for years, and I was shocked when I saw the water......