Once it is locked, a warning flag will be attached to it. A kingpin lock prevents the semi trailer from coupling or towing a locked trailer. To secure the kingpin, you will need to use a king pin lock. READ ALSO: What is the Best Sound System For a Truck? A king-pin can be located anywhere from the tractor’s front end to its rear end. It connects the two units by way of a steel pin. It is also referred to as the k-pin, king-pin, or fifth-wheel coupling device. The kingpin is the pivotal component that connects the fifth-wheel and the trailer on a semi-truck. In addition, if the kingpin is too bent, it will not function properly and may cause the truck to wobble during driving. Kingpin failures may also cause improper fifth wheel locking. A worn kingpin can cause improper alignment, excessive front tire wear, or even shaken steering. You can also use a dial indicator to check the kingpin.Ĭhecking the kingpin is essential for maintaining the alignment of your truck. All you need is a good quality jackstand and a jack. Fortunately, this problem is usually easy to spot. A damaged kingpin may cause too much end play in the tire. If you see any movement, the kingpin is likely to be worn.Ī worn kingpin may also cause wheel play. You should also have a rust buster on hand for the area where the kingpin is held in place. To check the kingpin, raise the front of the truck, using a jack and safety stands to support the axle. This design prevents the trailer from jackknifing, which is one of the leading causes of traffic pile-ups.Ī worn kingpin can cause tires to wear unevenly on one side of a truck. Sliding kingpins, on the other hand, use a sliding mechanism that allows the kingpin to move in a horizontal fashion parallel to the tractor axle. Today’s trucks are hitched using a mechanical junction, which utilizes a static kingpin. A zero-scrub radius is achieved when the kingpin axis intersects the ground. This angle contributes to the scrub radius of the steered wheel, which is the distance from the centre of the tyre contact patch to the kingpin axis. The weight of the vehicle will force the wheel to turn to that position. The straight-ahead position is the lowest point in the suspended body. When a semi-truck is steering, the kingpin angle affects how the steering wheel turns. If the kingpin fails, a runaway truck trailer may result, which could hit other vehicles or even cause a crash. If you drive a commercial vehicle, you may wonder, “What is a Kingpin on a Semi-Truck?” The kingpin, which is located between the fifth wheel and the tractor-trailer, provides a coupling link between the two.
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