3.

Wear On One Side Of Teeth
Only one side of teeth has heavy wear markings.
Probable Cause :
  1. Worn wheel flange, allowing side of teeth to contact wheel surface or improper tracking on flangeless wheel.
  2. Loose or improperly positioned side guides.
  3. Blade not perpendicular to cut.
  4. Blade rubbing against cut surface on return stroke of machine head.
  5. The teeth rubbing against a part of machine such as chip brush assembly, guards, etc.