12/28/2023 0 Comments King pin on trailer(4) Function: King pin, which is a standard part used for connecting the tractor and semi-trailer. Compaction King Pin: (a) lock on the semi-trailer via bolt&nuts. Experiencing these symptoms while driving may result in a shaking cab or steering wheel. You will notice signs of kingpin and bushing failure from incorrect vehicle alignment, premature and uneven front tire wear, and rough handling. (b) The king pin is directly welded in the skid plate of the semi-trailer, and it can not be changed. Improper lubrication of kingpin bushings can cause kingpin contact points to begin to wear at the steering knuckle. Sometimes by 2 inches! This was common on Peterbilt Air Trac and Air Leaf in the 70’s and 80’s. Welding King Pin: (a) The skid plate thickness: 8mm, 10mm & 12mm. Hook to a trailer and it may overhang to one side more. Trailer kingpins are crucial to smooth operation and secure tractor/trailer couplings. You can actually see this on older trucks. One custom thing my wife’s uncle used to do at his trailer repair shop on a dedicated o/o trailer was offset the pin a little to the side by 1/4 ,1/2, or an inch to compensate for the tractor drive axles being offset to one side a little. If it is too deep like a lot of older trailers you can move it toward the nose or vice versa. Also it is a great time to custom set the pin depth from the nose. They make different shoulder lengths to compensate for the bolster depth. If you go thicker plate then what is on it get the proper length pin. If the pin is a weld in It will be easier to just cut it all off and replace with a new pin with it. Hardened steel will destroy a cast fifth wheel surface like a hardened hammer and actually becomes brittle over time. After the vehicle is used for a period of time, due to the frequent drops and hooks of the tractor and semi-trailer, necessary maintenance shall be carried out for the king pin: remove the oil sludge on the king pin (the oil sludge contains a lot of sand, which will aggravate the wear of the king pin) and supplement new grease.The older trailers used 1/4 thick plate. During initial use, add an appropriate amount of grease around the end of the king pin ī. The king pin must be replaced when the wear of the king pin reaches the wear limit.Ī. JOST king pins satisfy the most stringent safety requirements. Different designs make it possible to install king pins onto a trailer quite easily. ![]() Adjust the position of the lock bolt of the fifth wheel to eliminate the gap between the king pin and the lock hook ī. 2 and 3 king pins The king pin is a component of the coupling between the semi-trailer and the tractor unit. Regularly check the above items according to the instruction manual of each automobile manufacturer.ĭuring the running of a semi-trailer, the king pin rotates relative to the fifth wheel, causing the king pin to wear. Otherwise, replace the self-securing bolt and tighten it according to the specified torque.Į. Check whether any self-securing bolt is loose or broken. Check the skid plate for scars, distortion and foreign objects, otherwise it will cause abnormal wear of the king pin ĭ. The optional skid plate thickness is 8mm, 10mm, 12mm, 14mm and 16mm.Ĭ. The lock slides onto a trailers king pin to prevent a thief from pulling up. It needs surface carburizing and quenching treatment to enhance wear resistance of its surface. The Economy Trailer King Pin Lock provides security for trailers and RVs. The raw material of this kind of king pin is generally 20CrMnTi. The welded king pin is directly welded to the skid plate of the semi-trailer and cannot be replaced. If you want the gooseneck trailer to 5th wheel king pin adapter, you can use the Ram Gooseneck to 5th Wheel Trailer Coupler Adapter Inner Tube - Square KPG5-Q30IP or round KPG5-R30IP. Welded king pins are available in two models: 50# (2”) and 90# (3.5”). The Fifth Wheel Trailer King Pin 337KP20050 is a weld on king pin to make your trailer compatible with 5th wheel hitches. ![]() The semi-trailer king pin has two models: 50# (2”) and 90# (3.5”).įor 50# king pins, needing to correspond China standard GB/T 4606-2006 (or referring to ISO 337:1981).įor 90# king pins, needing to correspond China standard GB/T 4607-2006 (or referring to ISO 4086:2001).Īccording to different assembly forms, king pins can be divided into the following two styles:Īs shown in Figure 2 below. The introduction of king pins including the following aspects: a Sustainable Grease for Heavy Duty Truck Trailer Axles. 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. The king pin is one of key parts connecting the tractor and the semi-trailer. King pins, the bushings that encircle them, and their related components are essential for proper steering. A king pin is installed on a semi-trailer and cooperates with a fifth wheel on a tractor to realize hooking up and dropping the semi-trailer and the tractor, as shown in Figure 1 below.
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