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Page Title:
Table 9-4. Armature Wear Limits |
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 TM 9-2835-255-34
STARTER MOTOR REPAIR (Sheet 5 of 12)
8. INSPECT COMMUTATOR (1) FOR WEAR.
a. Measure diameter of commutator (1).
Check wear limits (table 9-4).
Table 9-4. Armature Wear Limits
Direct and General
Sizes and Fits
of New Parts
Support Wear Limits
Point of Measurement
2.1150 to 2.1250
Commutator Diameter
(5.37 cm to 5.40 cm)
2.000
Commutator Minimum
(5.08 cm)
Turned Diameter
Commutator Diameter
0.0020
Total Indicator Runout
(0.0508 mm)
with Shaft Diameter
at Bearings
b. If armature (2) is worn beyond limits
shown in table 9-4, assemble starter
motor (page 9-37) and replace,
c. Put armature (2) in lathe and position
cutting tool (3) and dial indicator (4)
against commutator (1).
WARNING
Always wear eye protection when operating a lathe.
Failure to wear eye protection could result in
serious injury.
9. CUT 0.007-INCH (0.018 MM) OFF
COMMUTATOR (1) AND UNDERCUT MICA
(5) To l/32-INCH (0.794 MM) DEEP AND
l/32-INCH (0.794 MM) WIDE.
a. Turn lathe on. Watch indicator (4). Cut
0,005-inch (0.013 mm) off commutator (1)
with tool (3). Turn lathe off. Check
commutator (1) for clean smooth surface.
b. Repeat step a and make final cut
0.002-inch (0.058 mm). Watch indicator (4)
to make sure that total indicator runout
is within the wear limits shown in
\ POINT OF CUTTING TOOL TO
BE 1/32 INCH BELOW CENTER
c. Turn off lathe. Pull tool (3) and indicator
LINE OF ARMATURE SHAFT.
(4) away from commutator (1).
d Start grooves in mica (5) with file.
Undercut mica (5) with piece of hacksaw
blade to l/32-inch (0.794 mm) deep and
l/32-inch (0.794 mm) wide. Mica (5) must
be cut away clean between segments (6)
of commutator (1).
Go on to Sheet 6
9-32
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