How to Determine Wear in Different Types of Rolling Bearings

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When it comes to maintaining machinery and equipment, understanding the condition of rolling bearings is essential. Bearings are critical components that support rotating parts and reduce friction. Over time, they can wear out due to continuous use, improper installation, or lack of maintenance. Knowing how to identify wear in different types of bearings ensures the smooth operation of your machinery and prevents costly breakdowns. Let’s take a closer look at how to assess the wear of various rolling bearings: **(1) Radial Ball Bearings** To determine if a radial ball bearing is in good condition, inspect the inner and outer raceways for signs of damage, such as peeling, severe wear, or deep scratches. The raceways should have a bright, even surface with no visible grooves. All the balls must be round and free from cracks, pitting, or detachment. The cage should remain firm, without looseness or deformation. When you rotate the outer ring by hand while holding the inner ring, it should turn smoothly with only a slight rolling sound. There should be no vibration or sudden stoppage. A normal radial ball bearing has a clearance between the inner and outer rings and the rolling elements of approximately 0.005–0.010 mm. If there is more than 0.03 mm of play, the bearing should be replaced. **(2) Tapered Roller Bearings** After using a tapered roller bearing, check for any signs of damage or wear on the rolling elements and the inner raceway. Ensure the cage is not too loose and that the edges of the inner ring are intact. The outer raceway should show no cracks. When the inner ring and roller assembly are installed in the outer ring, the rollers should sit evenly in the center of the raceway, with no more than 1.5 mm of forward movement. If any part fails this test, the bearing is no longer suitable for use. **(3) Spherical Roller Bearings and Cylindrical Roller Bearings** These bearings typically have separable outer rings. Under normal conditions, the inner and outer raceways and the rollers should be free from cracks, pitting, or deep wear marks. The cage should not be deformed and should properly hold the rollers in place. The clearance between the raceways and the rollers should not exceed 0.06 mm. Any deviation from these standards indicates potential wear and may require replacement. **(4) Thrust Ball Bearings** For thrust ball bearings, check both raceways for damage or excessive wear. The balls should be intact, without cracks or pitting, and the cage should remain rigid and undamaged. The balls should be tightly held between the two washers. If the bearing feels loose or the balls move freely, it may be worn and should be inspected further. Regular inspection and proper maintenance of bearings can significantly extend their lifespan and improve the efficiency of the machinery they support. Always refer to manufacturer guidelines and use appropriate tools when assessing bearing condition. --- **Related Articles:** - How to Shape the Rolling Ring of a Full-Complement Cylindrical Roller Bearing - Multi-Angle Analysis of Sliding Bearing Interference Fit This article is originally published on China Bearing Network. For more information, visit [http://www.chinabearing.net](http://www.chinabearing.net). Previous: The Difference Between SKF Bearings Next: Bearing Base; English and Chinese Terminology for Bearings

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