TM-9-2920-258-30-P
ALTERNATOR, 180 AMPERES, MODEL 5520AB
TECHNICAL MANUAL; DIRECT SUPPORT MAINTENANCE MANUAL
APRIL 1989
TM-9-2920-258-30-P - Page 23 of 76
TM 9-2920-258-30&P
5
Inspect rotor assembly as follows:
A
B
C
D
E
Check that rotor shaft (45) is straight and has no burred or stripped threads.
Check that rotor (46) has no grounds by touching one test lead of multimeter to
rotor shaft (45) and the other test lead to one slip ring (47). Ohmmeter reading
must be more than 10,000 ohms. If ohmmeter reading is not more than 10,000
ohms, Alternator is irreparable.
Repeat step B for other slip ring (47).
Check resistance of slip rings (47) by touching test leads of multimeter to each
slip ring. Resistance must be between 1.8-2.0 ohms. If resistance is not within
limits, Alternator is irreparable.
Check runout of slip rings (47) (ref Table 3-1, page 3-13).
3-11
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