Inspection, Service & Maintenance 10K-15K DEXTER AXLE ALIGNMENT Axle Alignment – Alignment can be determined by measuring from the center of the coupler to the center of each end of the axles. The difference should not vary more than 1/8”. In the case of multiple axles, the axles must also be in line with each other. The difference between the centers of one axle and end centers of the other axle must not vary more than 1/16”. How to measure: 1. Park trailer on level surface. 2. Lateral Centerline (E). Determine lateral centerline of trailer body and axles by measuring distance E between trailer and axle centerline first, and correct so that distance E is ¼” or less for each axle. 3. Thrust Angle (A,B). Measure distance A (curbside) then B (roadside) from the king pin or coupler to the front of the axle extension or axle centers. These must be equal to within 0.1 degree or 1/8” of each other (A=B+1/8”). Ensure the lateral tension (pulling force) applied to the measuring tape is the same for both A and B measurements. Use a tensioning device scale or optical (laser) to ensure accuracy. 4. Scrub Angle (C,D). Measure distances C (curbside) then D (roadside) between axles, measuring from front of axle extension to front of axle extension, or axle center to center. Adjust the rear axle so it aligns to the front axle. These also must be equal to within 1/16” of each other (C=D+1/16”). This measurement should be as close to zero as possible. The smaller the offset, the lower the rolling resistance and the better the fuel economy. 159
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