What speed is allowed when setting out a car with a hot bearing?

What speed is allowed when setting out a car with a hot bearing?

• A. Not to exceed 4 MPH
• B. Up to 10 MPH
• C. No speed limit
• D. At normal line speed

Answer: (A)

Moving a car with a hot bearing is a safety situation. When a bearing is hot, it means excessive friction and potential damage to the axle or bearing, so you want to minimize any additional heating and keep handling slow and careful. Limiting speed to not more than 4 mph provides a safe, controlled movement that reduces the risk of bearing failure, wheel damage, or a possible hot box fire while you set the car out or arrange for inspection. Moving faster, such as up to 10 mph or at normal line speed, would increase heat generation and wear, making a bad situation worse. Having no speed limit would be unsafe for the same reason, and the cautious 4 mph limit is the standard practice to protect equipment and crew when a car has a hot bearing.

Moving a car with a hot bearing is a safety situation. When a bearing is hot, it means excessive friction and potential damage to the axle or bearing, so you want to minimize any additional heating and keep handling slow and careful. Limiting speed to not more than 4 mph provides a safe, controlled movement that reduces the risk of bearing failure, wheel damage, or a possible hot box fire while you set the car out or arrange for inspection.

Moving faster, such as up to 10 mph or at normal line speed, would increase heat generation and wear, making a bad situation worse. Having no speed limit would be unsafe for the same reason, and the cautious 4 mph limit is the standard practice to protect equipment and crew when a car has a hot bearing.