Repair Motor, Electric, Alternating Current (SF #4, #5, and #6), (EF #3, #4, and #6) (FIGURE 3-11)

TM 55-1905-223-24-17

3-20. Repair Motor, Electric, Alternating Current (SF #4, #5, and #6),

(EF #3, #4, and #6) (FIGURE 3-11)

This task covers:

a. Repair

INITIAL SETUP :

Tools

Equipment Condition

Tool kit, general mechanic's,

Circuit breaker switched OFF, power

panel locked and tagged "Out of

Tool kit, electrician's,

Service - Do Not Operate."

Electric motor removed,

Materials/Parts

Tag, Item 1, Appendix C

Crocus cloth (fine)

(para. 2-31 for EF-4 and -6).

Rags, Item 6, Appendix C

See TM 55-1905-223-10 for HVAC systems

operation and equipment.

REPAIR

Repair is by sanding windings or replacing motor.

WARNING

Make sure electrical power is OFF to avoid personal injury.

a. Visually check the stator windings inside motor housing (2) for signs of burning.

b. Visually check rotor (3) for signs of burning.

If stator windings or rotor show signs of burning, replace the electric motor(paragraphs listed in INITIAL

SETUP, above).

d. Check rotor fan (4) and external fan (5) for bent or broken blades. If blades are bent or broken, replace

the electric motor (paragraphs listed in INITIAL SETUP, above).

e. Lightly sand the rotor (3), and stator plates inside housing (2), with fine crocus cloth.

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