| Commutator | O.D. | New - 32.0 mm (1.26 inch) |
| Allowable - 31.4 mm (1.24 inch) | ||
| Mica | Undercut | New - 0.50 mm (0.020 inch) |
| Allowable - 0.20 mm (0.0079 inch) | ||
| Brush | Length | New - 18.0 mm (0.709 inch) |
| Allowable - 11.0 mm (0.433 inch) | ||
| Brush holder - holder support | Resistance | Infinity |
| Commutator - armature coil core | Resistance | Infinity |
| Commutator - segment | Resistance | 0 Ω |
| Field coil lead - brush | Resistance | 0 Ω |
| Field coil brush - yoke | Resistance | Infinity |
