TABLE II. INSPECTION
Part Name &
Index No.
Type of
Acceptable
Inspection
Inspection Procedure
Defects
Noise Filter (1)
Electrical
Check for continuity between the
None
two terminals. Check that there is
no continuity between either
terminal and the case.
Fan (8)
Visual
Examine blades for cracks, nicks,
None
dents or bends.
Brushes (11)
Visual
Inspect for chipped or cracked
None
carbon. See that leads are riveted
tightly to brush, and are not
frayed or broken. Replace brush
if less than 0.49 inch long.
Bearings (33, 44)
Visual
Inspect for roughness, binding
None
or lack of lubrication.
Armature (42)
Visual
Examine for rough or pitted
None
commutator, and dark or burned
commutator bars.
Dielectric
Using 500 volts AC, test for a
None
Test
ground between each commutator
bar and armature shaft (not at
bearing surfaces); must not show
continuity. Test for a short
circuit or open windings with a
standard growler.
Stator Assembly
Visual
Inspect field windings (49 and 51)
None
(47 through 53)
for burned or damaged insulation,
for loose or open connections.
Dielectric
Using 500 volts AC, test for a
None
Test
ground between positive field
terminal and housing; must not
show continuity. This test must
be made with the radio noise
filter electrically insulated from
the motor frame, or prior to
installation of radio noise
filter.
Brush Rigging
Visual
Check for cracks, defective spring,
None
Assembly
brush box or other obvious defects.
(14 through 29)
A-5
