COMPONENT’ SERVICE-STARTING
SYSTEM
III
-+
BRUSHES AND SPRINGSREPI;ACEMENT
1. Brushes that are worn beyond wear limit line, or are
oil-soaked, should be replaced.
2. When replacing field coil brushes, crush worn brush with
pliers, taking care not to damage pigtail.
3. Sand pigtail end with sandpaper to ensure good soldering.
4. Insert pigtail into hole provided in new brush and solder
it. Make sure that pigtail and excess solder do not come
out onto brush surface.
5. When replacing ground brush, slide the brush from brush
holder by prying retaining spring back.
TESTING ARMATURE
Testing Armature for Short Circuit
1. Place armature in a growler.
2. Hold a thin steel blade parallel and just above while
rotating armature slowly in growler. A shorted armature
will cause blade to vibrate and be attracted to the core.
Replace shorted armature.
Testing Armature for Grounding
1. Touch armature coil core and the end of each commu-
tator bar with a pair of test lamp prods.
2. If lamp lights, it indicates a grounded armature. Replace
grounded armature..
E
861
Wear limit line
lEL0101
New brush
Soldered
(Make sure that there
is no excess solder
on brush surface.)
Surface marked A
I
1 E L04E
Growler
I
/ VII
I6E L08:
8-93
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