... use internal or external gear, 4 meters in diameter three rows roller slewing bearings to withstand high overturning moment. (5). ... roller and cross-roller, the majority diameter over 3 meters. Due to poor working conditions, dusty, these bearings have high load ... slewing bearing, slow rotation (10). ShieldDiameter from 2.5 meters to 6 meters, some larger diameter, these bearings work in very poor ...