MOTOR TRUCK SERVICE MANUAL
Fig. 20 - Ball Inner Race Damaged From Circulation of Abrasive Material.
During the course of operation, the unit breathes in much
in the lubricant. In addition, pieces of material broken
the same manner as the engine. As the hot unit coals, it
from the gear teeth are also deposited in the lubricant.
pulls air into the gear inclosure through the breather.
All of this material circulating in the case will lap the
Dust, grit, and other abrasive materials suspended in the
bearings and increase the radical and axial clearance
air are drawn into the case and deposited
originally built in these parts, Figs. 20 and 21.
Fig. 21-Ball Bearing Outer Race Lapped From Circulation of Abrasive Material.