TP-6073 4/06 45Section 7 Generator Troubleshooting
7.7 Brushes (EOR/EFOR Models)
The brushes provide a current path from the voltage
regulator to the collector rings. Because the brushes
carry a low current, inspect them every 3000 hours.
Abrasive dust on the collector rings could shorten the life
of the brushes. Excessive arcing at the brushes could
damage the voltage regulator. Weak springs, damaged
collector rings, sticking brushes, a loose holder, or poor
brush contact can cause arcing at the brushes. See
Figure 7-12 for brush component identification.
The brushes must be free to move within the holder and
be held in contact by the springs. When properly
positioned, spring pressure on the brush surface will
cause the brush to wear evenly. The brushes must ride
100% on the collector rings or arcing will occur and
cause burned rings or failure of the voltage regulator.
Figure 7-11 shows the correct positioning of the
brushes. Add or remove alignment shims as necessary
to center the brushes on the collector rings.
TP-598657
1
2
3
4
1. Correct position
2. Brush holder
3. Incorrect position
4. Generator collector rings
Figure 7-11 Brush Positioning
Replace brushes if they show excessive or uneven
wear.
Use a retainer wire (such as a paper clip) to contain the
brushes during disassembly and reassembly. Push the
brushes into the brush holder until the retainer wire can
be inserted into the brush keeping hole.
Replace brushes when they are worn to half of their
original size.
TP-598658
12
3
4
5
6
1. Brush holder
2. Retainer (paper clip)
3. Mounting screw
4. Alignment shim(s)
5. Brush
6. Spring
Figure 7-12 Brush Holder
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