![](/images/flag/s/en.gif)
Improper oscillation. To check the sanding belt oscillation: 1. Be sure the sanding belt is properly installed and the belt tension knob and air supply are ON. 2. Turn ON the sanding belt. —If the belt oscillates without contacting the limit switches, but the oscillation time to the left and right are NOT equal, proceed to Step 7, on Page 31. 3. An adequate stream of air through the air fork gap (Figure 26) is essential for proper oscillation. If the jet of air is weak through the gap, the