Achsschenkelbolzensätze

A king pin is the vertical pin that connects the steer axle to the steering knuckle on commercial vehicles with a solid front axle. It is the pivot the wheel turns around. A king pin set includes the pin, the bushings that surround it, and the related hardware needed to refurbish the joint.

The king pin supports the truck steering geometry and lets the wheel ends pivot to turn the vehicle, while carrying heavy vertical and cornering loads. It turns within bushings pressed into the steering knuckle, and shims set the correct end play so the knuckle pivots freely without being loose.

Without regular greasing, the pin and bushings wear and develop play. Signs include inner-edge or uneven front tire wear, a pulling or wandering feel, clunking or popping from the steer axle when turning or over bumps, and a shaking cab or steering wheel. Wear is checked by jacking the axle and measuring play, typically with a dial indicator. Because king pin wear affects steering and can put a truck out of service, a worn pin is replaced with a complete set and the bushings fitted to specification.

The correct king pin set depends on the axle model, so a kit specific to that axle is used. Confirm the part against the vehicle specification before fitting.