MOTOR TRUCK SERVICE MANUAL
Fig. 19-Roller Bearing End Wear.
The taper bearing shown on the left in Fig. 19 is a new
caused by foreign substance in the lubricant.
bearing. Close examination will reveal the raised ground
As a result of this wear, the pinion was no longer held in
and polished shoulder on the roll ends that contact a
proper position relative to the ring gear. The gears were
matching shoulder on the inner race. The dark center
"out of adjustment. " Continued operation, with end play
area is considerably lower than the roll end shoulder.
in the pinion damaged the contact area of the bevel teeth
which created noise.
The bearing shown in on the right in Fig. 19 has been
removed from a unit after a period of service. The bevel
gears were noisy and required replacement. Comparing
reasonably regular intervals will prevent the majority of
the roll ends of this bearing with those of the new one,
the difference is immediately apparent.
shoulder has worn completely away and below the
Readjustment of bearings damaged in this manner will
original height of the center recessed area.
not give a satisfactory repair job, as they will continue to
wear rapidly--they should be replaced.
New bearing assemblies should always be installed
along with new gear sets.