![]() ![]() 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. Adjust the position of the lock bolt of the fifth wheel to eliminate the gap between the king pin and the lock hook ī. ![]() 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 wear limit size of a king pin is shown in Figure 6 below: Measure the diameter of the king pin and replace it in time if it reaches the wear limit. Check the king pin for defects such as scars, premature wear, cracks, etc. (Note: Self-securing bolts can only be used once!)Ī. The reference tightening torque is 190NM. After cooling, use self-securing bolts to lock the interchange head. The welding method is the same as that of a welded king pin. The preheating temperature is within the range of 200-300℃. welded type semi trailer king pins)īefore welding, preheat the welding position of the retention plate. Note: Welding is not allowed within the range of Φ110mm on the upper surface of the king pin. For welding a king pin, preheat at the welding position before welding, with the preheating temperature within the range of 200 ~ 300℃, and then use CO2 gas shielded welding to weld. ![]() (Table 2-Selection table of bolted king pins) Item No.Īs shown in Figure 5 below. (Table 1- Selection table of welded king pins) If the selected king pin does not match the thickness of the skid plate, the king pin cannot be properly matched with the 5th wheel, or cause abnormal wear of the king pin.įor the selection of a king pin and a skid plate, please refer to the following Table1 and Table 2. The calculation of D value is as follows: The following two factors should be considered when selecting a king pin:ĭifferent semi-trailers have different loading designs, and the D-value of the king pin must meet the semi-trailer’s design requirements to ensure safety of the vehicle. The king pin is a class A force-bearing component on a semi-trailer. The optional skid plate thickness is 8mm, 10mm, 12mm, 14mm and 16mm. The raw material of this kind of king pin generally adopts 40Cr and undergoes quenching and tempering treatment. When the bolted king pin is worn or accidentally damaged or must be replaced duo to other reasons, remove the eight bolts and replace a new interchange head. The bolted king pin is to weld the retention plate on the semi-trailer skid plate, and then fix the interchange head on the retention plate with self-securing bolts. There are also two types of bolted type kingpins: 50# (2”) and 90# (3.5”).Īs shown in Figure 4 below. Components of a bolted type semi trailer king pin) The bolted king pin consists of a retention plate, a king pin (interchange head) and self-securing bolts. Welded type semi trailer king pins)Īs shown in Figure 3 below. It needs surface carburizing and quenching treatment to enhance wear resistance of its surface. 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. Welded king pins are available in two models: 50# (2”) and 90# (3.5”). 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: The king pin is one of key parts connecting the tractor and the semi-trailer. 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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