ARMY TM 9-6115-464-34
AIR FORCE TO 35C2-3-445-2
NAVY NAVFAC P-8-624-34
(2) Ultra sonic cleaning may be used if available. Consult manufacturers recommendations for cleaning
solutions and procedures to be used.
(3) After cleaning, dry rotor and balance assembly, stator assembly, and exciter stator by baking in an
oven at 200°F (93°C) for approximately 3 hours. After drying, apply a light coating of oil (Military
Specification MIL-I-9870) or corrosion preventive compound (Military Specification MlL-C4339) to
all ferrous-metal surfaces to prevent rusting.
(4) Dry all other parts with a clean, lint-free cloth.
(5) Inspect all electrical leads for a damaged or deteriorated insulation and evidence of shorting. Check
each electrical lead for continuity.
(6) Inspect blower and coupling disc for wear, cracks, breaks, or other damage.
(7) Inspect bearing kit for cracked or damaged housing. Check bearing for wear, pitting, and corrosion.
Check bearing adapter for wear and corrosion.
(8) Measure inside diameter of bearing housing. Diameter shall be 3.19492 to 3.19502 inches.
(9) Measure outer diameter of bearing adapter. Diameter shall be 1.3780 to 1.3784 inches.
(10) Inspect rotor shaft for discoloration or other evidence of overheating. If it is suspected that rotor shaft
is weakened, disassemble rotor assembly (paragraph b. (19) above) and perform magnetic particle
inspection in accordance with Military Specification MIL-I-6868.
(11) Inspect rotor and exciter cores for evidence of shorting and overheating. Check windings for physical
(12) Inspect rectifiers for evidence of shorting and overheating.
(13) Inspect end bell assembly for cracks, corrosion, and other damage. Inspect exciter stator for
evidence of shorting and overheating. Check windings for physical damage.
(14) Inspect lead block assembly for cracks, corrosion, and other damage.
(15) Inspect stator assembly for cracks, corrosion, and other damage. Check windings for evidence of
shorting or other physical damage.
When making electrical checks, take precautions to avoid accidental contact with
conductors carrying high voltage. Make certain that test leads are properly connected.
Failure to observe this warning could result in servere personal injury or death.
Make sure that component being tested is electrically isolated from all other
components. Failure to observe this caution could result in damage to the equipment.
(16) Using tester, ground check rotor core by applying 300 Vac at 60 Hz RMS for 1 second between heat
sink and rotor shaft. There shall be no evidence of dielectric breakdown.
(17) Using a double bridge, measure resistance of rotor core. Resistance shall be 0.2154 to 0.2486 ohms
at 77°F (25°C).
(18) Install rotor and balance assembly and dymetric balance machine and check for static and dynamic
balance. Unbalance shall not exceed 0.5 inch-ounce in either balance plane. Balance rotor and
balance assembly as outlined in step (25) below.