![single person pinbox install single person pinbox install](https://i.pinimg.com/originals/df/2f/f9/df2ff9a17ca671f51dc69ce2f0eee8df.jpg)
(2 and 3) Once the two bolts are removed, the kingpin base is still held in place by the pin plate assemblies on the sides of the pin box. Don’t use a 12-point socket, as this might strip or break the socket. A long-handled torque wrench would also work. Instead, we used a long-levered breaker bar with a hardened-steel six-sided ¾-inch impact socket. We couldn’t break the bolts loose with a regular ratchet and were concerned that using an extension handle would risk breaking the ratchet and/or the socket. There is one bolt on each side of the pin box. (1) First, loosen the serrated flange bolts (above) that hold the kingpin base onto the pin box. The replacement of the pin assemblies and links is an easy half-hour job that requires an extra set of hands for a few minutes to remove the kingpin base from the pin box. We had towed our trailer more than 40,000 miles in the course of seven years of ownership, so this kind of wear came as no surprise. Both the pin assemblies and the links inside the pin box needed to be replaced to make sure the connection between the truck and trailer was as rigid as possible.
![single person pinbox install single person pinbox install](https://i.pinimg.com/originals/51/71/02/517102595b32aef410dc7181826e594c.jpg)
On a recent check, we found the kingpin base felt a little sloppy and the assembly plates were warped away from the Demco Glide Ride pin box.
![single person pinbox install single person pinbox install](https://i.pinimg.com/736x/74/e1/2f/74e12fff7e07ce0b2551624bd5b3ee8d.jpg)
We also verify that there is no play in the kingpin base by grabbing it with both hands and twisting sideways. We check the kingpin assembly a few times a year, ensuring that the bolts are tight and the welds are good. We keep our one-ton diesel truck and 36-foot fifth-wheel trailer in top shape by inspecting key components on a regular basis. Replacing a worn kingpin assembly strengthens the truck-and-fifth-wheel connection and improves towing stability