| Customization: | Available |
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| Diameter: | 1/2 inch |
| Loading Weight: | 150tons |
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Semi-trailer Fifth Wheel: The Key Connecting Hub for Efficient Transportation
| I. Robust and Durable Structural Design | It is made of high-quality high-strength alloy steel and undergoes a special heat treatment process, which significantly improves the hardness and toughness of the material. The key parts of the main structure are thickened and can withstand a vertical load of up to [X] tons and strong impact forces under complex working conditions. This ensures that it will not be easily deformed or damaged during frequent connection, disconnection, and long-term transportation, greatly extending the service life of the product. |
| II. Precise and Flexible Connection Mechanism | With a unique saddle design, it can closely cooperate with various standard specifications of tractors. The arc-shaped contour of the saddle plate fits the traction pin of the tractor. When connecting, it can achieve rapid and accurate positioning, with the error controlled within a very small range. At the same time, it is equipped with a high-precision guiding device, which can ensure a smooth connection between the semi-trailer and the tractor even under non-ideal road conditions. The operation is simple and smooth, effectively reducing the connection time and improving transportation efficiency. |
| III. Excellent Buffering and Shock Absorption Performance | It is equipped with high-performance rubber buffer pads and damping shock absorption devices, which can effectively absorb the vibrations and impact forces generated during the vehicle's driving due to road bumps, acceleration and deceleration, and steering. This can not only protect the frame structures of the tractor and semi-trailer and reduce the wear of components but also significantly improve the stability of cargo transportation, ensure the safety of valuable or fragile goods, and reduce transportation losses. |
| IV. Convenient Operation and Maintenance | The operation handle of the fifth wheel is designed in line with ergonomic principles, and the operation force is light. Even in the case of frequent operation, it can reduce the labor intensity of the driver. In addition, the overall structural layout of the product is reasonable, and all components are easy to disassemble and install. The tools required for daily maintenance are simple and common, which is convenient for maintenance personnel to quickly carry out maintenance work such as inspection and replacement of components, reducing the equipment downtime and ensuring the continuity of transportation operations. |
The fifth wheel of a semi-trailer, as a crucial connecting component between the tractor and the semi-trailer, has a wide variety of classification methods. Each classification corresponds to unique performance characteristics and application scenarios.
| size | the No. 90 fifth wheel. Its traction pin has a diameter of 90mm and boasts a strong load-bearing capacity, usually capable of withstanding a load of more than 30 to 150 tons. It is mostly applied in long-distance heavy-load transportation, such as the transportation of large-scale engineering materials, and can stably tow heavy-duty semi-trailers. |
| the No. 50 fifth wheel has a traction pin diameter of 50mm, with a general load-bearing capacity of around 20 to 150 tons. It is more suitable for medium and light-duty semi-trailers and is commonly found in urban logistics distribution and express delivery transportation. It can operate flexibly when frequently shuttling through urban roads. | |
| the function | the single-action fifth wheel has a relatively simple structure, with only a single action of connection and separation. It is easy to operate and is suitable for semi-trailers used in the transportation of general goods with relatively fixed transportation routes and low functional requirements, and can efficiently complete regular transportation tasks. |
| The double-action fifth wheel has more functions. In addition to the basic functions of connection and separation, the saddle can also rotate or lift at a certain angle. This enables it to flexibly adjust its posture when dealing with special scenarios such as airport luggage transportation and port container transfer, better meeting the special needs of cargo loading, unloading, and transportation. | |
| processing technology | the cast fifth wheel is manufactured using the casting process. It has good integrity and strength, can bear a huge load, and can be shaped into complex shapes to meet different structural requirements. It is widely used in the field of heavy-duty semi-trailers where high strength and reliability of the fifth wheel are required. |
| The forged fifth wheel is made by the forging process. After forging, the internal structure of the material is compact, with excellent strength and toughness. The product quality is stable and reliable, and the production efficiency is relatively high, making it suitable for large-scale production. It is mostly applied to mid-to-high-end semi-trailer products. | |
| The welded fifth wheel has obvious advantages. It has extremely high production flexibility and can weld various parts with different shapes and sizes together according to different design requirements and customers' personalized needs, achieving customized production and meeting the usage requirements of special working conditions and special vehicle models. In terms of cost control, since it does not require complex molds and large-scale forging equipment, the production equipment is relatively simple, the investment cost is low, and the material utilization rate is relatively high, effectively reducing the overall production cost. In terms of later maintenance and modification, if a certain part is damaged, only the damaged part needs to be welded for repair or replacement, and the operation is relatively simple. It is also convenient to modify and upgrade the fifth wheel according to the actual usage situation. Through scientific and reasonable design of the welding structure, it is possible to reduce its own weight while ensuring the strength and performance of the fifth wheel, which helps to improve the vehicle's fuel economy and transportation efficiency. At the same time, it can skillfully combine parts of different materials and shapes to form a complex structure, meeting the force requirements of the fifth wheel under different working conditions and greatly enhancing its comprehensive performance. | |
| height | the fixed-height fifth wheel has a variety of height specifications. For example, the height of the No.50 fifth wheel is generally between 130 and 260mm, and the overall height of the No. 90 fifth wheel after installation is usually higher, and the specific height will vary depending on different vehicle models. Among the adjustable-height fifth wheels, the lifting-type fifth wheel can move up and down within a certain range and is often used in tractors at port terminals, which can adapt to semi-trailers of different heights. There are also some high-end heavy trucks equipped with an air suspension system (ECAS), which can adjust the vehicle body height through the tractor, and thus indirectly adjust the height of the fifth wheel. |
| swing angle | the single-degree-of-freedom fifth wheel (single-axis fifth wheel) generally can only swing forward and backward. For example, the forward and backward swing angle of the stamped saddle is approximately between 14° and 15°. It has high driving stability and is suitable for high-speed, light-load, and semi-trailers with a high center of gravity that travel on roads with good conditions. |
| The double-degree-of-freedom fifth wheel (double-axis fifth wheel) can swing in both the forward-backward and left-right directions. However, due to its relatively high height, its lateral stability is not ideal when the vehicle makes a turn at high speed, so it is less used in ordinary highway transportation. |
| I. Preparation before Installation | 1. Model Matching: Confirm that the model of the fifth wheel matches the specifications of both the semi-trailer and the tractor. Check the product manual and verify parameters such as the size of the traction pin and the load-bearing capacity to ensure a proper fit. |
| 2. Preparation of Tools and Materials: Prepare the necessary installation tools, such as wrenches (with different specifications to fit bolts and nuts), a torque wrench (to ensure precise tightening), a jack, a crowbar, a spirit level, etc. At the same time, prepare the connecting parts required for installation, such as bolts, nuts, and washers, and ensure that their quality meets the standards. | |
| 3. Site Selection: Select a flat, solid, and spacious installation site to ensure there is enough space for operation. Avoid working on slopes, soft ground, or in narrow spaces to prevent the vehicle from sliding or causing danger due to inconvenient installation. | |
| 4. Component Inspection: Carefully inspect all components of the fifth wheel and check for any defects such as deformation, cracks, or wear. Pay special attention to key parts, such as the saddle plate, traction pin hole, and connection lugs. If any problems are found, replace them in a timely manner. | |
| II. Installation Steps | 1. Positioning: Place the tractor and the semi-trailer in the normal connection position. Use a spirit level to ensure that the frame of the tractor is in a horizontal state. Determine the installation position of the new fifth wheel according to the design drawings of the semi-trailer or the position mark of the original fifth wheel and make a mark. |
| 2. Installing the Base: If the fifth wheel has an independent base, install the base on the frame of the semi-trailer first. Use a jack to lift the base to an appropriate height so that the installation holes of the base are aligned with the pre-drilled holes on the frame. Insert the bolts and washers, and use a wrench to initially tighten the nuts, but do not tighten them completely to facilitate subsequent fine adjustment. | |
| 3. Installing the Main Body of the Fifth Wheel: Hoist the main body of the fifth wheel above the base, align the installation holes, and lower it slowly. Check again whether all the hole positions are completely aligned. If there is a deviation, you can gently pry and adjust it with a crowbar. After alignment, insert the remaining connecting bolts, put on the washers, and initially tighten the nuts with a wrench. | |
| 4. Adjustment and Tightening: Use a spirit level to check the levelness of the fifth wheel. Adjust it by adding or reducing washers or slightly adjusting the position of the base to ensure that the fifth wheel is in a horizontal state, with the error controlled within a very small range. Use a torque wrench to gradually tighten all the bolts and nuts in a crisscross diagonal pattern according to the specified tightening torque to ensure that all the connection parts are evenly tightened. | |
| 5. Connecting the Auxiliary Devices (if any): If the fifth wheel is equipped with electrical lines (such as for automatic connection detection devices), air pipelines (for air braking systems, etc.) and other auxiliary devices, connect them according to the product instructions. Ensure that the lines and pipelines are firmly connected, and there are no situations such as looseness, air leakage, or electric leakage. At the same time, organize the lines and pipelines to prevent them from interfering with other parts of the vehicle. | |
| III. Usage Methods | 1. Connecting the Semi-trailer and the Tractor: Reverse the tractor in front of the semi-trailer so that the traction pin of the tractor is aligned with the traction pin hole of the fifth wheel of the semi-trailer. Reverse slowly while observing the alignment situation to ensure that the traction pin falls accurately into the hole. When you hear a "click" sound or feel an obvious locking feedback, it indicates that the traction pin has been correctly locked in the fifth wheel. |
| 2. Checking the Connection Status: After the connection is completed, check the connection between the fifth wheel and the traction pin around the vehicle to see if they are fully engaged and whether the locking mechanism is working properly. You can shake the semi-trailer or move the tractor slightly to confirm the firmness of the connection again. | |
| 3. During Driving: During the driving process, the driver should pay attention to the driving status of the vehicle. If any abnormal shaking, abnormal noise, or other situations are found, stop the vehicle immediately to check whether the connection of the fifth wheel is loose or there are other problems. Avoid aggressive driving operations such as sudden braking and sharp turns to reduce the impact on the fifth wheel. | |
| 4. Separating the Semi-trailer and the Tractor: First, lower and firmly support the landing gear of the semi-trailer to ensure the stability of the semi-trailer. Then operate the unlocking device of the fifth wheel to release the traction pin from the fifth wheel. Drive the tractor forward slowly to separate the tractor from the semi-trailer. | |
| IV. Precautions | 1. Installation Precautions: During the installation process, it is strictly prohibited for personnel to stand under the vehicle or in dangerous areas where they may be squeezed or collided. When using a jack, ensure that the jack is placed smoothly and supported firmly to prevent the vehicle from slipping and causing an accident. When installing bolts and nuts, it is necessary to operate strictly according to the specified tightening torque. Too loose a connection is likely to cause looseness, and too tight a connection may damage the threads or components. |
| 2. Usage Precautions: Regularly check the connection parts, locking mechanism, wear condition, etc. of the fifth wheel. Conduct a comprehensive inspection at least once a month, and repair or replace any problems found in a timely manner. Overloading is strictly prohibited. The load-bearing capacity of the fifth wheel is the designed safety value. Overloading will seriously affect the driving safety of the vehicle, cause damage to the fifth wheel, and even lead to accidents. After driving on rough roads, pay special attention to checking whether there are any abnormalities in the fifth wheel, such as loose bolts caused by bumps. |
Jining Shengda Machinery Co.,ltd is a comprehensive enterprise that integrates design, production, and sales of semi-trailer parts and semi-trailer, located in Jining City, Shandong Province, China. The company was established in 2004, mainly engaged in trailer axles, trailer suspension, trailer landing gear, trailer fifth wheel, trailer king pin,container fasteners twist lock, brake chamber, slack adjuster, air bank, semi trailer parts and semi trailer. Also distributes truck parts,excavator parts,bulldozer parts,agricultural equipment parts,,lifting platform parts,general machinery parts,used semi trailer,used truck and so on. It has various manufacturing equipment and more than 1000 experienced employees with a factory area of over 24000 square meters. Our company has large-scale production and warehousing capabilities. Improving product quality, improving employee quality, strict quality assurance system and sound management system, and high-quality after-sales service are our foundation. Our company adheres to the principle of "quality first, reputation first" and provides customers with various types of products with quality and quantity assurance. In the fierce market competition, keep up with the times, maintain innovation, and ensure product leadership! Relying on technology, continuously improving the technological content of the products sold, and creating higher market value for society, customers, and companies. Our company has always created enterprises with integrity, operated the market with integrity, and won a good reputation, as well as the respect of our domestic and foreign peers.
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