What control and service work has to be carried out regularly on a fifth wheel?

You answered correctly. Both lubricating the fifth wheel and checking its fixing to the frame are essential maintenance tasks. The fifth wheel is a key coupling component between the tractor and trailer; it must always be well-lubricated to reduce friction and wear. Regularly checking the attachment to the frame ensures it is securely mounted and safe for operation. Fifth wheels are not maintenance-free, so regular service prevents malfunctions and safety risks. Remember these two main tasks to keep the coupling reliable and safe.