Inspection and Repair

BRUSH




1. Measure the length of each brush. If wear exceeds the service limit, replace the brush. Each brush has the service limit mark on it.

Brush length:
Standard
18.5 mm (0.728 in)

Service limit
5.0 mm (0.197 in)




2. Checking brush spring for proper pressure Using a spring pressure indicator, push the brush into the brush holder until its tip protrudes 2 mm (0.08 in). Then measure the pressure of the brush spring. If the pressure is less than 2.648 N (270 g, 9.52 oz), replace the brush spring with a new one. The new spring must have a pressure of 4.609 to 5.786 N (470 to 590 g, 16.58 to 20.81 oz).