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TM5-4210-229-14&P
5-13.
STARTER REPAIR. (Continued).
TEST
a.
Testing shunt coil for open.
Cleaning solvent, Federal Specification P-D-680 is
both toxic and flammable. Keep off skin. Use only
in a well ventilated area and avoid prolonged
breathing of vapors. Keep away from open flame.
(1)
Clean all starting motor parts with solvent
(Appendix D, Item 54).
(2)
Inspect armature
commutator, shaft and
bushings, overrunning clutch pinion, brushes
and springs for discoloration, damage or
wear. Replace as required.
(3)
Check fit of armature shaft in bushing in drive
housing. Shaft should fit snugly in the
bushing. If the bushing is worn, it should be
replaced.
(4)
Inspect armature commutator. If commutator
is rough, it should be turned down. Inspect
the points where the armature conductors join
the commutator bars to make sure they have
a good connection. A burned commutator bar
is usually evidence of a poor connection.
(5)
Check the armature for short circuits by
placing on growler and holding hack saw
blade over armature core while armature is
rotated. If saw blade vibrates, armature is
shorted. Recheck after cleaning between the
commutator bars. If saw blade still vibrates,
replace the armature.
(6)
Using a test lamp, place one lead on the shut
coil terminal and connect the other lead to a
ground brush. This test should be made from
both ground brushes to insure continuity
through both brushes and leads. If the lamp
fails to light, the field coil is open and will
require replacement.
b.
Testing series coil for open.
Using a test lamp, place one lead on the series coil
terminal and the other lead on the insulated brush.
If the lamp fails to light, the series coil is open and
will require repair or replacement. This test should
be made from each insulated brush to check brush
and lead continuity.
5-33
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