Mariner 115 - Armature Tests; Checking and Cleaning Commutator; Field Tests; Test for Ground

6A-37POWER TRIM90-13645--2 495
2. Lift motor from end cap. Use care not to drop
armature.
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a
b
a - End Cap
b - Armature
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.
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CHECKING AND CLEANING COMMUTATOR
1. If commutator is worn, it may be turned on an ar-
mature conditioner or a lathe.
2. Clean commutator with “OO” 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
No Continuity
(R x 1)
Green Motor Wire,
and Frame
No
Continuity
No Continuity
(R x 1)
Blue Motor Wire,
and Frame
No
Continuity
No 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.