Connections are one of those things that make life easier, and at the same time, more complex. Connections are made all over the vehicles we service. For the most part, those connections are probably taken for granted until there is trouble. Then that connection gets our undivided attention rather quickly, if we know which one failed.
Troubleshooting some connection issues can be a real challenge. However, there is one connection that is open to view whenever a truck comes in for service: the fifth wheel. Obviously, the fifth wheel is a critical component to the safe operation of a tractor-trailer combination. When this connection is broken without warning while the vehicle is going down the road, the results are clearly catastrophic. This is most assuredly one area of the vehicle where maintenance should not be overlooked.
Fifth wheel manufacturers recommend regular maintenance—typically every 90 days or 30,000 miles. Generally speaking, fifth wheel maintenance is fairly straightforward. Service information for your specific fifth wheel should be consulted for the recommended intervals and maintenance items. In most instances, the procedures include degreasing the fifth wheel, checking for wear, checking for cracks or damage to mountings, loose fasteners, broken or damaged springs and making sure all the release and latching mechanisms are in good working order.
Of course, maintenance and regular inspection of the trailer king pin is the connecting piece of this set up. The king pin and mounting surface on the trailer also need to be inspected for wear and damage. Refer to your truck service information resource, like TruckSeries from Mitchell 1, for wear and geometric specification for the trailer.
Connections are important. While the fifth wheel and king pin may not be the most glamorous marriage, it is an important one. And, like any marriage you want to last, it requires a little attention and TLC, or disaster could be just around the corner.
Additional tips for repair and maintenance of Class 4-8 trucks may be found in the Mitchell 1 ShopConnection Truck blog: mitchell1.com/shopconnection/category/truck/.
Jake Schell is the associate product manager for Mitchell 1’s Commercial Vehicle Group. Mitchell 1 ShopConnection Truck
