ball mill trunnion bearing maintenanceTrunnion Bearing Sag Mill Traditionelle Thai Massagen Trunnion Bearing Sag Mill Putting a ball or sag mill on care and maintenance previous next about the trunnion no need to pull the bearing caps completely off the mill needs to be jacked high enough to get the last shim in place so that when the mill is lowered onto the shims it is no longer resting on the bearings