Page 114
12
G
Cleaning, Inspection, and Replacement of the Commutator, Continued:
2. Using a micrometer, measure the outside diameter at two points along the commutator. If the commu-
tator outside diameter is less than 1.535 inches (39 millimeters), replace the armature and bearings
(Figure 12-46, Page 113).
Armature Ground Test
Using a multimeter set on ohms (
Ω
), place the positive probe on the commutator bars and the negative
probe on the armature core. The reading should be no continuity. If the reading is incorrect, replace the
armature and the two bearings (Figure 12-47). See WARNING and NOTE below.
Visual Inspection of Field Coils
If the insulation on the field coils appears blackened or charred, the serviceability of the coils is ques-
tionable. Burned or scorched coil insulation indicates the motor has overheated due to overloads or
grounded or shorted coil windings. Be sure the insulators are tight in the housing.
Reworking the Starter/Generator
Any rework must be performed by a qualified technician. Starter/Generator service specifications are listed in
the following table.
• NEVER USE EMERY CLOTH ON THE COMMUTATOR. PARTICLES OF EMERY ARE CONDUC-
TIVE AND MAY SHORT-CIRCUIT THE COMMUTATOR BARS. NEVER USE OIL OR LUBRICANTS
ON THE COMMUTATOR OR BRUSHES.
• DO NOT SUBMERGE ARMATURE IN SOLVENT.
• BEFORE TESTING, WIPE THE ARMATURE WITH A CLEAN CLOTH AND REMOVE CARBON
DUST AND METAL PARTICLES FROM BETWEEN COMMUTATOR BARS.
ITEM
SERVICE LIMIT
Commutator diameter (minimum)
1.535 inches (39 millimeters)
Concentric with armature shaft within
.002 inch (0.051 millimeter)
Limit depth of cut when machining commutator
.007 inch (0.2 millimeter)
If undercut of segment insulator is less than .016 (0.406 millimeter), then it should be
undercut to
.031 inch (0.8 millimeter)
Dielectric strength
500 VAC for one minute
Armature insulation resistance
0.2M
Ω
at 500 VDC
Starter field coil resistance
0.006-0.01
Ω
Generator field coil resistance
4.5-5.5
Ω
CAUTION
CAUTION
NOTE
Summary of Contents for 1997 DS
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