Starter Brush: Testing and Inspection

INSPECT BRUSHES
Using vernier calipers, measure the brush length.
Standard length: 15.5 mm (0.610 in.)
Minimum length: 10.0 mm (0.394 in.)

If the length is less than minimum, replace the brush holder and field frame.




INSPECT BRUSH SPRINGS
Check the brush spring load.

Take the pull scale reading the instant the brush spring separates from the brush.
Standard spring installed load: 17.6 - 23.5 N (1.79 - 2.41 kgf, 4.0 - 5.3 lbf)
Minimum spring installed load: 11.8 N (1.20 kgf, 2.7 lbf)

If the installed load is less than minimum replace the brush springs.