Use a dial indicator to check for end play and keep a log of the findings. In addition to regular lubrication, it’s a good idea to check for steer axle king pin problems every time a truck is on a lift. Maintaining proper lubrication is the key for the long life of the parts and the system overall. Less-than-ideal grease intervals or use of the incorrect grease will cause the protective layer of grease to break down, and the interior of the bushing will begin to erode due to the metal-on-metal contact. With proper maintenance, a layer of grease ensures that the king pin does not make contact with the bushings. However, by far the most frequent cause for king pin wear is lack of maintenance. There are two main causes of king pin wear: poor maintenance practices and damage due to an accident.
Especially when managing a fleet, costs like that accumulate quickly. For example, a loose king pin in an axle can eventually necessitate replacing the entire axle. If a worn king pin is ignored, or a repair is not completed thoroughly, the result can be costly structural repair. Signs of king pin wear or damage include uneven front tire wear, incorrect vehicle alignment, and a pull in the steering. These hefty steel pins work in tandem with the bushings to handle intense forces while keeping the knuckle in proper alignment.
The king pin on a truck connects the steer axle to the steering knuckle, supporting the steering geometry and allowing the wheel ends to turn the vehicle. King pins, the bushings that encircle them, and their related components are essential for proper steering. When king pin wear occurs, get the labor-intensive replacement job done correctly the first time with a kit that provides high-quality parts and ease of installation. Proper maintenance is the key to prolonging the life of the crucial king pin, but no part lasts forever. A “king pin” may be defined as “a thing essential to the success of an operation,” so it’s no surprise that the steer axle king pin in a commercial vehicle is a supremely significant part.
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