6B-30 90-13645--2 495POWER TRIM
Armature Tests
TEST FOR SHORTS
Check armature on a Growler per the Growler man-
ufacturer’s instructions. Replace armature if a short is
indicated.
TEST FOR GROUND
1. Use an Ohmmeter (R x 1 scale). Connect one
lead on armature shaft and other lead on commu-
tator. If continuity is indicated, armature is
grounded. Replace armature.
51359
CHECKING AND CLEANING COMMUTATOR
1. If commutator is worn it may be turned on an
armature conditioner or a lathe.
2. Clean commutator with “00” sandpaper.
a
a - Commutator
FIELD TESTS
IMPORTANT: Commutator end of armature must
be installed in brushes when performing the fol-
lowing tests.
Ohmmeter
Leads Between
Resistance
(Ohms)
Scale Reading*
(x )
Green and Blue Motor
Wires
0
Full Continuity
(R x 1)
Green and Black Motor
Wires
0
Full Continuity
(R x 1)
Blue and Black Motor
Wires
0
Full Continuity
(R x 1)
Black Motor Wire, and
Frame (Motor Housing)
No
Continuity
Full Continuity
(R x 1)
Green Motor Wire, and
Frame
No
Continuity
Full Continuity
(R x 1)
Blue Motor Wire, and
Frame
No
Continuity
Full Continuity
(R x 1)
* If specified readings are not obtained, check for:
defective armature
dirty or worn brushes
dirty or worn commutator
If defective components are found, repair or replace
component(s) and retest.
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