TM 55-203
Figure 4-19. Economical selection of wheels and axles.
Figure 4-20. Length of worn journal.
inserted in place before the journal box is fitted over the
4-8. Journal Box and Assembly
journal.
a. General. The journal box contains the bearing and
b. Bearing. The journal bearing serves the same
wedge assembly, the axle journal, and necessary waste
purpose as all other bearings. Its distinguishing feature
packing or lubricating pads and lubricant (fig 4-22). The
is its unusual top bearing function in contrast to the
journal -box dust guard ,and plug are inserted in a
usual lower or all-round bearing so often encountered in
vertical slot in the back end of the box. The plug
machine construction. If affords a tough, solid wearing
provides a close fit with the turned axle dust-guard seat
surface at the point of contact, where the weight of the
to prevent cinders, dirt, or moisture from entering the
car is transferred to the journal. Since it is necessary to
box from the back) a condition that might otherwise
replace these bearings frequently, they are designed to
increase wear on the journal or bearing and possibly
be removed easily. They are
eventually cause a hot journal. The dust guard is
4-14
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