Page 256 - Intro Predictive Maintenance

Process Parameters 247

Figure 10–2 Normal wear pattern.

Figure 10–3 Wear pattern caused by abrasives in
lubricating oil.
Abrasion

Abrasion creates unique wear patterns on the teeth. The pattern varies depending on
the type of abrasion and its specific forcing function. Figure 10–3 illustrates severe
abrasive wear caused by particulates in the lubricating oil. Note the score marks that
run from the root to the tip of the gear teeth.

Chemical Attack or Corrosion
Water and other foreign substances in the lubricating oil supply also cause gear degra-
dation and premature failure. Figure 10–4 illustrates a typical wear pattern on gears
caused by this failure mode.