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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 generator efficiency and output volt-
age. Polish the slip rings with fine sandpaper while
turning the rotor until rough spots disappear. Care
should
be
taken not
to
touch the rotor coils with
the sandpaper.
11-2
AC
VOLTAGE
IS
TOO
HIGH
OR
TOO
LOW
11 -2-1 CHECKING ENGINE SPEED
If
the engine speed is too high or too low, adjust
it
to the rated r.p.m.
[How
to
adjust
engine
r.p.m.1
*
Loosen the lock nut on the adjusting screw.
*
Turn the adjusting screw clockwise
to
decrease
engine speed or counterclockwise to increase
engine speed.
Normal
engine
speed
at
no
load
3700
to
3750
rpm
11
-2-2
CHECKING
STATOR
Check stator referring to Step 11
-1
-1.
11
-2-3
CHECKING
ROTOR
Check rotor referring
to
Step
11
-1
-2.
Fig.
11-4
ADJUSTING
SCREW
\
Fig.
11-5