8-5 ROTOR ASSEMBLY
1) Field coil
Remove the brush holder and measure resistance between the slip rings.
Rotor (Slip ring)
Resistance
RGV12000
4.11Q
RGV1300dT
69.6 Q
NOTE : If the circuit tester is not sufficiently accu-
rate, it may not show the values given and
may give erroneous readings.
Erroneous reading will also occur when
there is a wide variation of resistance
among coil windings or when measure-
ment is performed at ambient tempera-
tures different from from 2O”c(68 “F).
SilP RING
2) Cleaning Slip rings
The slip ring surfaces must be uniformly
bright. Slip rings showing black spots,
excessive wear, or uneven wear must be
repaired. A stained slip ring lowers gener-
ator efficiency and output voltage. Polish
the slip rings with fine sandpaper while
turning the rotor until rough spots disap-
pear. Care should be taken not to touch
the rotor coils with the sandpaper.
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