The load is very small per bearing, hence they tend to be fairly trouble free. They have about 40 permantly greased bearings mounted on an axle. The inner races are stationary. The bore of the bearing is comparativly large in com- parison to the o.d. of the bearing. The bearings have about 25 balls in them.
Mt. Hope rolls that they are pretty trouble free in dry locations.
I was able to successfully predict the last failure. I was able to be at the repair shop when they disassembled the last failure. What I found was a cage failure on the second bearing in from the backside of the roll. Complete cage failure, not a trace of it left. The balls literaly rolled out on the floor when the bearing was removed.