Analysis of Common Failures and Troubleshooting Methods for Radial Ball Bearings

Radial ball bearings are general‑purpose fundamental transmission components, widely used in automated equipment, motors, conveying machinery and general transmission devices, mainly bearing radial loads and slight axial loads. During long‑term high‑speed and high‑frequency continuous operation, factors including installation errors, poor lubrication and harsh working conditions may trigger failures such as abnormal noise, excessive temperature rise and jamming wear, which directly impair equipment operation accuracy and production stability. Mastering failure causes and troubleshooting approaches is critical to extend bearing service life and reduce equipment failure rates.

Abnormal noise and excessive vibration are the most frequent faults. In most cases, they are caused by insufficient or deteriorated grease, or dust contamination, which intensifies friction between balls and raceways and produces periodic noise. Besides, misalignment during installation, poor shaft concentricity and excessive fitting clearance will result in eccentric rotation and uneven stress, bringing persistent vibration. For troubleshooting, replace with clean grease in time, calibrate shaft coaxiality, inspect fitting precision of inner and outer rings, and eliminate assembly looseness and offset.

Abnormal temperature rise mostly stems from improper lubrication and overload operation. Excessive or insufficient grease causes internal frictional heat accumulation and poor heat dissipation. Long‑term overload and excessive axial force accelerate rolling‑element wear and temperature buildup. Meanwhile, contamination ingress due to failed seals increases running resistance and overheating. Solutions include controlling grease filling volume, adjusting working loads, replacing worn seals and maintaining a clean operating environment.

Jamming, sluggish rotation and premature spalling failures are mainly caused by abnormal clearance, impact damage during assembly or long‑term fatigue operation. Violent knocking during mounting damages raceways. Repeated stress leads to fatigue pitting and surface spalling, and eventually jamming. Standardize disassembly‑assembly procedures in routine maintenance, inspect bearing precision regularly and replace worn parts timely. Targeted checks on lubrication, assembly and working conditions can effectively resolve typical failures of radial ball bearings and ensure stable, low‑loss operation of transmission equipment.