PS
S1.1
1700
001
OE35
Version no
T-code
F-code
Section
C-code
Drive Motor 24 Volt
72
Service Manual
1997-10-21
2.4. Brush and Commutator
The brushes and commutator should be inspected for even
wear and good commutation.
Good Commutation:A dark uniform coloring pattern at the
brush wearing surface.
Poor Commutation:The surface of the commutator
appearing rough, pitted, scored or signs of burning or heavy
arcing between bars. The color pattern will be:
Streaky film with commutator wear.
Bar edge burning.
Uneven film.
Carbon dust bridging between bars.
Brushes should be inspected for uneven wear and signs of
overheating, i.e.:
Discolored brush shunts.
Discolored brush springs.
Refer to the Brush Chart at the end of this section.
2.5. Armature
1. Check security of fan.
2. Check for loose commutator bars. Loose commutator
bars will usually be indicated by excessive wear or
burning on one bar. The commutator can be checked
for loose bars by lightly tapping all of the bars with the
handle of a plastic or wooden handled screwdriver. A
contrasting dull thud or vibration will indicate a loose
bar in which case, the armature must be replaced.
3. Check for grounded circuits using a test light. Most
commercial growlers incorporate a test light as shown
in illustration below.
Check the armature for grounded circuits by placing
one test lead of the test lamp on the commutator and
the other test lead on the armature shaft. If the test
light lights, the armature is grounded.
4. Standard Winding Armatures are tested on a growler
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