TM 9-4120-402-14
5-9. EVAPORATOR AND CONDENSER FAN MOTOR (B2) REPAIR. - continued
(b)
To replace thermal (overload) protector (7):
1
Remove four screws (2) and conduit box cover (3).
2
Remove two sets of screws (8), nuts (9), lock washers (10), and spacers (11).
3
Pull thermal (7) as far out of conduit box (6) as wire leads will allow.
4
Tag and disconnect wire leads from thermal (7). (See paragraph 4-26.)
5 See wiring diagram figure 4-10 and tags. Solder leads to new thermal (7). Remove tags. (See paragraph 4-
26.)
6
Secure thermal (7) to conduit box (6) with two sets of screws (8), spacers (11), lock washers (10), and nuts (9).
7
Secure conduit box cover (3) to conduit box (6) with four screws (2).
(c)
To replace bearings (12) and (13):
1
Match-mark front and rear end shields (14) and (15) to field ring/stator assembly (16). Mark field ring/stator
assembly indicating end with longer shaft.
2
Remove four sets of screws (17), nuts (18), and lock washers (19).
3
Carefully tap front and rear end shields (14) and (15) away from field ring/stator assembly (16) and slide off
rotor (20) shaft.
4
Remove rear spring washer (21). Inspect for excessive wear, nicks, or breakage. Replace if damaged.
5
Remove front washer (22). Inspect for excessive wear, nicks, or breakage. Replace if damaged.
6
Remove bearings (12) and (13) from rotor (20) shaft. Use bearing puller if necessary.
7
Inspect field ring/stator assembly (16) for broken or cracked weld, any visible damage, shorted windings (para
8
Inspect front and rear end shields (14) and (15) for cracks or any visible damage. If damaged, replace.
9
Inspect rotor (20) and shaft for evidence of overheating. Replace rotor if overheating is evident.
10 Inspect rotor (20) for nicks, gouges, and deformation. Dress high metal defects in shaft with a fine file or
stone. If shaft is beyond repair, replace rotor.
11 Coat bearing cavity of front and rear end shields (14) and (15) with oil.
12 Coat rear spring washer (21) and front washer (22) with oil.
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