To properly align heavy-duty trucks, buses and trailers, it is necessary to first determine the axle configuration.
On vehicles with more than two axles it is also necessary to determine which axle should be used as a reference axle. Some axles are not adjustable, therefore that axle must be used as the reference axle. |
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The other axles are then aligned to the non-adjustable reference axle of an all wheel alignment. If all axles are adjustable, the rearmost drive axle is generally used as the reference axle.
Use the following diagrams to determine which alignment procedure should be used for the vehicle being aligned. |
