Commutator Service
Chuck armature on the commutator end--bearing
MICA
1.
COPPER SEGMENT
journal and support the drive end of armature using the
”live”centeroftheshaft.Withthearmaturesupportedon
both ends, measure the commutator runout and the bar
to bar differences with a dial gauge. Total indicated run-
out should not exceed 0.003” (0.08 mm) and not more
than 0.0005” (0.013 mm) between any two bars. If the
readings fall outside this limit, the commutator must be
turned and re--undercut.
0.040”
(1.0
mm)
GOOD UNDERCUT
MICA
MICA
COPPER SEGMENT
COPPER SEGMENT
2.
If the commutator must be turned, use only high
quality cutting tools with a controlled cutting rate. Re-
move only enough copper to bring total indicated runout
and bar to bar height differences into specification.
BAD UNDERCUT
(CUT TOO WIDE)
BAD UNDERCUT
(CUT TOO NARROW)
3.
mm). If the commutator diameter falls below this diame-
ter after turning, the armature must be replaced.
The minimum commutator diameter is 2.750” (70
Figure 60
4.
auniformdepthof0.040”(1.0mm).Becarefultoonlycut
the mica and not increase the slot width (Fig. 60).
After the commutator is turned, undercut the mica to
Traction Motor Specifications
BRUSH LENGTH
Maximum
Minimum
1.300 in
0.620 in
33 mm
16 mm
CAUTION
BRUSH SPRING
TENSION
When using compressed air for cleaning mo-
tor components, follow all safety instructions,
including wearing eye and respiratory protec-
tion.
New Brush
Worn Brush
65 ounces
40 ounces
1820 grams
1120 grams
COMMUTATOR
New Diameter
2.920 in
2.800 in
74 mm
71 mm
5.
After undercutting, use No. 00 sandpaper to lightly
remove any burrs left from the undercutting operation.
Clean commutator with dry, oil free compressed air and
recheck commutator runout.
Minimum Diame-
ter for Reslotting
Reject Diameter
2.750 in
70 mm
Armature Testing
Before an armature is reassembled into the motor, the
following tests should be performed:
NOTE: Armature is wave wound and can be short cir-
cuit tested in the following manner.
1.
Check for grounded circuits by placing one test lead
of a dielectric tester on the commutator and the other
lead at the armature shaft. If the test light comes on, the
armature is grounded.
2.
growler. Use a long, flat piece of metal (such as a hack-
saw blade) to locate any shorted windings.
Check for short circuits by placing the armature on a
If armature is found to be shorted, grounded or other-
wise damaged, replace the traction motor.
Electrical System
Workman MDE
Page 3 -- 40
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