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 14 of 76
TM 9-2920-258-30&P
3-2
GENERAL INSTRUCTIONS (cont.)
During disassembly, tag critical parts such as bearings and electrical leads to facilitate
reassembly.
CAUTION
Never mark bearing surfaces.
During assembly, sub-assemblies should be assembled first, combined into major components
where possible and then installed to form a complete component.
3-3
REPLACEMENT OF PARTS
Unserviceable and irreparable assemblies will be broken down into issue and serviceable parts
will be returned to stock. Parts or assemblies which cannot be repaired, selective-fitted, or
reclaimed to the standards contained in this manual will be salvaged and new parts used to
replace them.
When assembling components and assemblies, replace damaged keys with new ones, if
possible. Screws, washers and nuts that are loose or damaged must be tightened or replaced.
Gaskets, packings, preformed packings, seals, Iockwashers, locknuts, cotter pins and spring
pins must be replaced. Bushings must be replaced only if removed.
Springs must be replaced if broken, kinked, cracked or do not conform to standards specified in
repair data.
Reconditioning of the old part is necessary if a required part is not available. Such parts should
be inspected carefully after reconditioning to determine their suitability and probable service
life. Replacement parts should be requisitioned immediately.
3-4
BALL AND ROLLER BEARINGS
Refer to TM 9-214 for cleaning, inspection and lubrication of bearings, and instructions for
evaluation of bearing life.
3-5
REMOVING BURRS, SCRATCHES AND RAISED METAL
Use fine mill file, soft stone or crocus cloth dipped in mineral spirits, paint thinner or dry cleaning
solvent to remove burrs, scratches or raised metal.
When filing aluminum, clean file often with steel file brush to avoid lodging file with aluminum
particles which will gouge work surface.
3-2
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