REAR
BEARING
SLIP \
RING~
TEST CURRENT
DRAW OR RESISTANCE
BEWEEN RINGS
BEARING
AREA
/ KEY SLOT
SHAFT
THREADS
NOTE: PLACE TEST LEADS ON EDGES
OF SLIP RINGS TO AVOID CREATING
ARCS ON BRUSH CONTACT SURFACES.
ROTOR INSPECTION AND ELECTRICAL TESTING
B.
Grounded Slip Ring or Winding
Use
12
volt
DC
test
lamp,
ohmmeter, or
110V
AC
test lamp. Place one test lead
to
the rotor
body
and
the other
on
either slip ring. Open circuit from either slip ring
to
the rotor body
is
a
correct condition.
C.
Condition of Slip Rings
1.
Clean brush contacting surfaces with fine crocus cloth, wipe dust and residue
away.
2.
If surfaces are worn beyond this restoration, replace the entire rotor assembly.
D.
Rotor Shaft and
Pole
Pieces
1.
Stripped threads
on
shaft
2.
Worn
key
slot
3.
Worn
bearing surface
4. Scuffed pole fingers
5.
Worn
or dry rear bearing
Replace rotor assembly if any of the above faults are noted with the exception of item
5.
NOTE:
New
rotors include a new rear bearing and new slip rings as part of the assembly.
If
rear bearing requires replacement, follow instructions for this operation.
_
74
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