What components should be inspected when coupling a tractor to a semi-trailer?

When coupling a tractor to a semi-trailer, one of the most critical components to inspect is the fifth wheel. The fifth wheel is the component that connects the tractor to the trailer, and ensuring that it is free from damage and defects is essential for safe operation. If the fifth wheel has any cracks, wear, or other damage, it may not hold the trailer securely, increasing the risk of an accident or malfunction during transit.

While inspecting the fifth wheel is crucial, it's also important to consider that a complete safety check encompasses other components such as brakes and lights, as well as fluid levels and tire pressure. However, the focus on the fifth wheel emphasizes its direct role in the coupling process. A faulty fifth wheel can lead to a failure in the connection, which can be much more dangerous than issues with fuel levels or tire pressure. Therefore, prioritizing the fifth wheel inspection is key to ensuring safe coupling and operation.