TM-9-2320-280-34
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1996
TM-9-2320-280-34 - Page 297 of 1258
TM 9-2320-280-34
6-3.
60 AMPERE ALTERNATOR REPAIR (Cont ’d)
b.
Cleaning
Clean all alternator components in accordance with para.
2-13.
c.
Inspection
NOTE
For general inspection instructions, refer to para.
2-14.
1.
Inspect end housing (2) for cracks, breaks, and stripped threads.
Replace end housing (2) if defective.
2.
Check the brushes (11) for roughness, galling, and wear.
Replace brushes (11) if defective.
Replace
brushes (11) if brush length is less than 0.25 in.
(6.35 mm).
3.
Check the brush springs (10) for damage.
Replace brush springs (10) if damaged.
4.
Check the output plate (1) for burned, frayed, or broken wiring.
Replace output plate (1) if defective.
5.
Check rectifier terminals (4) and (6) for continuity in one direction and infinite resistance in opposite
direction.
Check for shorts from rectifier terminals (4) and (6) to rectifier plates (5) and (7).
Replace
rectifier plates (5) and (7) if defective.
6.
Check the rotor (12) and stator (13) for shorts, grounds, and open circuits.
Inspect rotor (12)
bearings surfaces (refer to TM 9-214).
Replace alternator if defective.
7.
Check brush holder (8), brush holder insulator (9), and positive rectifier insulator (3) for cracks and
breaks.
Replace brush holder (8), brush holder insulator (9), or positive rectifier insulator (3) if
defective.
8.
Inspect intermediate housing (15) for cracks, breaks, and stripped threads.
Replace alternator if
defective.
9.
Inspect drive end housing (14) for cracks and breaks.
Replace drive end housing (14) if defective.
10.
If all components pass testing, replace regulator (16).
6-10
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