Your tractor is equipped with a K 80 coupling system with manual locking. What must you ensure when coupling a trailer?

You answered correctly. With a K 80 coupling system with manual locking, it is essential to lock the retainer on the coupling system after coupling the trailer to ensure a secure connection. Additionally, you must adjust the height of the trailer coupling so that it fits properly with the towing vehicle. This helps prevent mechanical stress and reduces wear. Option 3, lubricating the coupling system before each use, is not a specific requirement for every use, but regular maintenance is still important. For this question, only answers 1 and 2 are required by regulation. Remember these requirements to safely and properly couple a trailer with this system.