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Page Title:
Table 9-6. Armature Wear Limits |
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 TM 9-2835-255-34
STARTER MOTOR REPAIR (Sheet 6 of 11)
7. INSPECT COMMUTATOR (1) FOR WEAR.
a. Measure diameter of commutator (1).
Check for wear limits (table 9-6).
Table 9-6. Armature Wear Limits
Direct and General
Sizes and Fits
of New Parts
Support Wear Limits
Point of Measurement
(Inches)
(Inches)
2,125 to 2.140
Commutator Diameter
(5.397 cm to 5.435
cm)
I
I
2.0625
Commutator Minimum
(5.08 cm)
Turned Diameter
Commutator Diameter
0.003
Total Indicator Runout
(5.2387 mm)
with Shaft Diameter
at Bearings
b. If armature (2) is worn beyond limits
shown in table 9-6, assemble starter
motor (page 9-59) and replace.
c. Put armature (2) in lathe and Dosition
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 0.007-INCH (0.178 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 (0.127 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 (0.051 mm). Watch indicator (4)
to make sure that total indicator runout
is within the wear limits of table 9-6.
c. Turn off lathe. Pull tool (3) and dial
indicator (4) away from commutator (1).
d. Start grooves in mica (5) with file.
Undercut mica (5) with piece of 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 7
9-56
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