Bench Troubleshooting
Instruction and Service Manual
46
Pacific Scientific REDI-LINE Generators
Procedure No. 2: AC Brush Inspection
Procedure:
1. Remove any electrical connections to the generator.
2. Remove the electrical assembly cover.
3. Disconnect the lead wires to the components inside the cover.
4. Carefully remove the brush holder assemblies.
5. Check the brushes for free travel within their holders.
6. Remove the brushes and springs. Make note of the position and orientation
of each brush removed; if reused, individual brushes must be returned to the
same holders, in the same orientation as removed.
7. Visually inspect the springs for distortion.
8. Visually inspect the brushes for damage.
9. Inspect the overall length of the brushes.
10. Reassemble the entire unit.
Desired Results:
1. The brushes should move freely within their holders with no binding when
they are depressed, and return to their original positions when released.
2. A small amount of spring distortion is acceptable.
3. Brush faces should be smooth, and the entire brush should be free from
defects.
4. Brushes should not be shorter than .056 inches.
5. Generator should start and run steadily.
Disposition:
1. If any brush binding is found, remove the brushes and clean them and their
holders.
2. If major distortion of the spring is discovered, replace the spring.
3. Burnishing of the brush faces is acceptable, but if pitting or damage is
discovered, replace both brushes in the pair. Inspect the armature
commutator for damage.
4. If either brush is too short, replace both brushes in the pair.
