Section 06 ELECTRICAL
Sub-Section 05 (ELECTRIC STARTER)
06-05-8
Test Armature for Shorted Winding :
When the armature is rotated in the growler with
a steel strip (hack-saw blade) held above it, the
strip will vibrate over that area of the armature
which has short circuited.
1. Steel strip (hack-saw blade)
2. Growler
Test the Armature for Open Circuit :
Use growler test probes. Place one test probe on
a commutator bar and the other test probe on the
neighboring bar. Repeat this operation for all bars,
moving one test probe at a time. If the growler
lamp does not turn on, the armature circuit be-
tween these two bars is opened. The armature
should be replaced or repaired ; open circuits
most often occur at the commutator riser where
coils are soldered. (Burnt commutator bars are
usually an indication of an open-circuited armature
coil).
Field Windings and Brushes
Test the Field Winding for Open Circuit
Use growler test probes. Place one test probe on
the negative brush and the other test probe on the
yoke. If growler lamp does not turn on, the field
winding has an open-circuit. The yoke has to be
repaired or replaced.
1. Test probes
Check the dynamic brake winding for open circuit
by placing one test probe on the positive brush
and the other probe on the negative brush.
If growler lamp does not turn on, the winding cir-
cuit is open-circuit and the yoke has to be repaired
or replaced.
Brush Holder
Check the brush holder for insulation using growl-
er test probes. Place one test probe on the insu-
lated brush holder and the other test probe on the
brush holder plate. If the growler lamp turns on,
the brush holder has to be repaired or replaced.
Brush Length
Measure brush length. If less than the specified
value, replace them.
A09E09A
1
2
MODEL
LENGTH
New
Wear
limit
All
10 mm
(.400 in)
6 mm
(.236 in)
A09E0AA
1
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