4-35. MAIN GENERATOR BRUSHES (cont)
Adjust brush sets to equal pressure. Unequal pressure will cause unequal current distribution in
Attach spring scale to each brush lever (6) directly over brush (7) and pull straight up in line with the brush travel
until the spring just lifts clear of the brush. Spring pressure must be 3.25 to 3.75 lb (1.45 to 1.70 kg). Replace
brush holder if specifications cannot be met.
Start locomotive in accordance with paragraphs 2-10 and 2-11. Apply soft stone to commutator and run
locomotive at half speed (no load) until commutator is polished and brushes are seated.
Install cover (1).