1. Identify the axle group:
Semi trucks typically have two or more axles, each with multiple wheels. The axle group refers to the set of axles that are positioned close together and support a portion of the truck's load.
2. Use a weight scale:
The simplest and most accurate way to find axle weights is to use a truck weight scale. Load the truck onto the scale and ensure it is positioned evenly. The scale will display the weight on each axle group and the total weight of the truck.
3. Calculate manual estimation:
If a weight scale is not readily available, you can estimate axle weights using formulas and measurements:
- Gross Vehicle Weight (GVW): This is the total weight of the loaded truck, including the weight of the vehicle itself, its cargo, passengers, and any additional equipment.
- Axle Load Distribution: Depending on the specific truck configuration and load distribution, the weight is distributed differently among axle groups.
* Front Axle Weight (FAW): The portion of the GVW carried by the front axle or axle group. Typically, the FAW is around 20-25% of the GVW.
* Drive Axle Weight (DAW): The portion of the GVW carried by the driving axles, which are usually located in the rear. The DAW is usually 65-75% of the GVW.
* Tag Axle Weight (TAW): If the truck has a tag axle, it carries a portion of the load behind the drive axles. The TAW is typically 5-10% of the GVW.
4. Add the axle weights:
Once you've determined the individual axle weights, add them together to get the total weight of the loaded truck. Make sure the total weight does not exceed the truck's legal weight limit for its specific classification.
Precautions:
- Axle weight distribution is important for safety, performance, and compliance with regulations.
- Regularly check axle weight to avoid load imbalance and potential penalties for overloading.
- Always refer to the truck's manufacturer specifications, local regulations, and legal limits for axle weight.
