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1.1.3.3.4
Measure distances A and B from the king pin to the front axle. Refer to
Figure 4. These must be equal within 1/8 inch of each other. Measure
distances C and D between axles using gauge as shown in Figure 5. Note
that all currently available trailer axles have dimples or recesses at the center
of the axle spindle ends. These also must be equal within 1/16 inch of each
other. Determine lateral centerline of trailer body and axles. Distance E
should not exceed 1/4 inch for either axle. (Distance E is the distance
between axle and trailer centerlines.)
Figure 4
Figure 5
Gauge for measuring axle centers
* The gauge can be made of drill rod and must be rigid and true. The pointer arms of the
gauge must be parallel and held at the same height.
1.1.3.3.5
Precautions:
A. Always measure to the front axle ends for accurate alignment.
B. Avoid measuring to rims, suspension brackets, hub cap vent holes,
brake drums and the like. This can result in improper alignment.
C. If difficulty is encountered in obtaining true alignment, check and repair
or replace problem suspension parts.
D. Always align any succeeding axles with the front axles, not the kingpin.
ADJUSTABLE