Maintenance and repair of a fifth wheel coupling (also known as a fifth wheel hitch or simply a fifth wheel) on a heavy-duty truck. The fifth wheel is a critical component that connects the tractor unit to the semi-trailer, allowing for articulation and power transfer. Regular maintenance, as shown, is essential for safety, smooth operation, and preventing costly breakdowns. Welcome to Premium parts & services, Our Truck & Trailers Spare Parts Store. Located in Dar es Salaam, Tanzania, we specia