... Port mobile cranePort cranes usually use internal or external gear, 4 meters in diameter three rows roller slewing bearings to withstand ... -row roller and cross-roller, the majority diameter over 3 meters. Due to poor working conditions, dusty, these bearings have ... roller slewing bearing, slow rotation10. ShieldDiameter from 2.5 meters to 6 meters, some larger diameter, these bearings work in very ...