test probes. Place one test probe on the
brush holder and the other on the frame. If
cleaning solvent and dry with clean, dry,
the lamp lights, there is a short circuit and
compressed air. Do not soak the insulation
the starter must be replaced.
of the field coils in solvent.
55. Starting Motor Assembly Reassembly and
(4) Clean the armature with compressed air to
Installation
remove any dust or dirt. Wipe the armature
with a cloth dampened with an approved
cleaning solvent; dry with clean, dry,
a. Reassembly.
compressed air.
(1) Reassemble the field coils, frame, and pole
(5) Clean the motor drive housing with a cloth
shoes in reverse of the numerical sequence
dampened with an approved cleaning
as illustrated on figure 13E.
solvent and dry with clean, dry, compressed
air.
(2) Reassemble items (3 through 11, fig. 13C
and 6 through 18, fig. 13D) in reverse of
(6) Clean all other metal parts with an
the numerical sequence.
approved cleaning solvent and dry
thoroughly.
(3) Insert the armature and drive assembly (fig.
13D) in the motor drive housing (fig. 13C)
b. Inspection, Testing, and Repair.
and install items (1 through 5, fig. 13D) in
reverse of the numerical sequence.
(1) Inspect the commutator for roughness or
out-of-round. Mount the armature with its
(4) Insert the assembled motor drive housing
bearing surfaces on V-blocks and measure
and the armature end drive assembly in the
the commutator runout with a dial indicator.
starter frame and secure with screws (1, fig.
Turn down a commutator that is out-of-
13C) and washers (2).
round 0.003 inch or more.
(5) Reassemble the brush and holder assembly
(2) Inspect the armature coil leads at the
in reverse of the numerical sequence as
commutator bars for loose connections. If
illustrated on figure 13B.
loose, solder the leads in the riser bars.
(6) Reassemble items (10 through 21, fig.
(3) Inspect the brush and brush terminals.
13A) in the reverse of the numerical
Replace the brushes as a set if they are oil-
sequence.
soaked, chipped, burned, or worn to less
than one-half inch in length. Replace the
(7) Install the brush and holder assembly (fig.
brushes if the terminals on the brush leads
13B) on the end bell and reassembly items
are damaged.
(4 through 9, fig. 13A) in reverse of the
numerical sequence.
(4) Inspect the brush springs for a tension of 36
ounces. Replace defective springs.
(8) Install the assembled commutator end
frame on the starter frame and secure with
(5) Inspect all other parts for worn, damaged,
the bolts (1) and washers (2).
or defective condition. Replace or repair
worn, damaged or defective parts as
(9) Install the starting motor brushes (TM -
necessary.
3820-206-20/2).
(6) For armature and field coil test, refer to TM
b. Installation. Install the engine starting motor and
5-764.
solenoid (TM 5-38220-205-2/2).
(7) Test the insulated brush holder for short
circuits or grounds using a test lamp and
AGO 8456A
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