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Regular maintenance is not a typical cause of bearing trouble. In fact, it is a proactive measure that helps prevent bearing issues. Regular maintenance involves routine inspections, lubrication, and adjustments that ensure bearings operate smoothly and efficiently. It helps identify potential problems before they escalate and leads to prolonged bearing life and reliability.

In contrast, incorrect lubrication, excessive temperature, and misalignment can all lead to significant bearing problems. Incorrect lubrication can result in inadequate protection and wear of the bearing surfaces, while excessive temperature can lead to thermal expansion, increased wear, and even failure. Misalignment can cause uneven load distribution and excessive stress on the bearings, leading to premature wear and potential catastrophic failure. Therefore, while other factors contribute to bearing trouble, regular maintenance acts as a safeguard against such issues.