Figure 2.9. Traction Motor.
and turns it slowly while drawing the wire. An open or grounded circuit in an individual coil can be
repaired without rewinding.
d. Brushes and brush holders are inspected periodically. Brushes should move freely in the
holders and the holders and insulator must be clean. Lift the springs and clean the brushes by raising and
lowering them in the holders. Brushes that have been chipped or show excessive wear are replaced with
the same grade of brush. When new brushes are installed, they are sanded-in by placing a piece of No.
00 sandpaper under the brush and moving the paper in the direction of rotation, illustrated in figure 2.10.