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8-5 ROTOR ASSEMBLY
1) Field coil
Remove the brush holder and measure resistance between the slip rings.
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 20
(68 F).
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.
Rotor (Slip ring) Resistance
RGV12100
4.11
RGV13100T
69.6
SLIP RING
ROTOR
SANDPAPER
8-6 EXCITING COIL (RGV12100 only)
1) Disconnect the two yellow wires which
come out from the exciting coil through the
hole of the crankcase and connected with
A.V.R. in the control box.
2) Check the resistance between two yellow
wires with a circuit tester.
Exciting coil for A.V.R. Resistance
RGV12100
2.35
3) Check the AC voltage between these two
yellow wires when the engine speed at no
load ; 3600
-
3800 rpm with a circuit tester.
AC voltage
35 to 45 V