TM 5-2330-325-13&P
0052
CHECKING AXLE ALIGNMENT
NOTE
For proper tracking and reduced tire wear, the axles must be properly aligned in relation to
the kingpin. Prior to alignment, make certain the suspension is free and loose and the
axles have not been placed in a binding condition due to sharp turns or unusual
maneuvers. Axles can be relaxed (neutralized) by simply moving the semitrailer back and
forth in a straight line or raising the axle(s) off the ground to allow them to straighten out.
Alignment can be accomplished with an optical device designed for this purpose, or it can
be accomplished manually by use of a steel tape measure.
1.
Measure distance "D" (Figure 1) from kingpin centerpoint (Figure 1, Item 2) to centerline of axle spindle
(Figure 1, Item 1).
2.
Measure distance "D1" (Figure 1) from kingpin centerpoint (Figure 1, Item 2) to centerline of the axle spindle
(Figure 1, Item 1) for opposite side of axle.
3.
Compare dimensions taken in Steps 1 and 2. If dimensions "D" and "D1" are equal, axle is aligned. If
dimensions are not equal, axle must be aligned. Subtract difference between dimension "D" and "D1" and
divide difference in half. This is amount of change required to bring axle into square with kingpin.
1
D
Y
Y
2
D1
Y1
Y1
466-0055
Figure 1.
Axle Alignment.
END OF TASK