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Page Title:
Table 9-2. Armature Wear Limits |
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 TM 9-2835-255-34
STARTER MOTOR REPAIR (Sheet 5 of 13)
7. INSPECT COMMUTATOR (1) FOR WEAR,
a. Measure diameter of commutator (1).
Check for wear limits (table 9-2).
Table 9-2. Armature Wear Limits
Direct and GeneraI
Sizes and Fits
Point of Measurement
of New Parts
Support Wear Limits
(inches)
(inches)
Commutator Diameter
2.115 to 2.125
(5.372 cm to 5,397
cm)
Commutator Minimum
2.00
Turned Diameter
(5.08 cm)
Commutator Diameter
Total Indicator Runout
0.0020
with Shaft Diameter
(0.0508 mm)
at Bearings
b. If armature (2) is worn beyond limits
shown in table 9-2, assemble starter
motor (page 9-16) 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.
8. CUT OFF 0.007-INCH (0.0178 MM) AND
UNDERCUT MICA (5) TO l/32-INCH
(0.794 MM) DEEP AND l/32-INCH (0.794
a, Turn lathe on. Watch indicator (4). Cut
0,005-inch (0.0127 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 (0.005 mm). Watch indicator (4)
to make sure total indicator runout is
within limits shown in table 9-2.
c. Turn off lathe. Pull tool (3) and indicator
(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
9-10
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