Brush Test
- Connect ohmmeter lead to positive brush holder and other lead to negative brush holder. If continuity exists, replace brush holder assembly.
- Check brush length. See BRUSH LENGTH SPECIFICATIONS TABLE . If brush length is less than specified, replace brushes.
- Using brush spring scale, measure spring tension. See BRUSH TENSION SPECIFICATIONS TABLE . If tension is less than specified, replace brush holder assembly. Ensure brushes move freely in holders.
BRUSH LENGTH SPECIFICATIONS
| Application | Standard Length In. (mm) | Minimum Length In. (mm) |
|---|---|---|
| M/T | .67 (17.0) | .43 (11.0) |
BRUSH TENSION SPECIFICATIONS
| Application | Standard Ft. Lbs. (N) | Minimum Ft. Lbs. (N) |
|---|---|---|
| M/T | 4.2-5.1 (18.9-23.1) | 1.5 (7.0) |