Starter Brush: Testing and Inspection

BRUSH AND BRUSH HOLDER




1. Brush length
Measure the brush length and replace if it exceeds the service limit.
Replace if abnormal wear or cracks are noticed.

2. Brush movement
Be sure brush moves smoothly inside brush holder.




3. Insulation resistance of brush holder Be sure there is no continuity between brush holder and its plate.

4. Brush spring force
Measure brush spring force with a spring scale. If it is less than the service limit, replace brush spring.

Brush spring force:
Standard
18.6 N (1.9 kgf, 4.2 lb) (when new)

Service limit
6.9 N (0.7 kgf, 1.5 lb)