TM 9-4120-402-14
5-9. EVAPORATOR AND CONDENSER FAN MOTOR (B2) REPAIR. - continued
(c) To replace ball bearings (9) and (10):
1
Match-mark motor frame/stator (11) and end bell bracket (12) to ease reassembly.
2
Remove eight sets of screws (13) and lock washers (14).
3
Carefully pull end bell bracket (12) from motor shaft.
4
Remove bearing washer (15). Inspect for excessive wear, nicks, or breakage. Replace if damaged.
5
Remove shim (16). Inspect for excessive wear, nicks, or breakage. Replace if damaged.
CAUTION
Bearings are permanently lubricated and sealed at the time of manufacture. Do not attempt to
clean or relubricate them. Keep bearings in plastic bags or wrap securely in grease-proof paper
until needed for reassembly.
6
Remove ball bearing (9).
7
Carefully pull rotor/shaft (17) from frame/stator (11).
8
Remove four screws (18).
9 Remove bearing retainer (19). Inspect for excessive wear, nicks, stripped threads, or breakage. Replace if
damaged.
CAUTION
Bearings are permanently lubricated and sealed at the time of manufacture. Do not attempt to
clean or relubricate them. Keep bearings in plastic bags or wrap securely in grease-proof paper
until needed for reassembly.
10 Remove ball bearing (10).
11 Remove bearing spacer washers (20). Inspect for excessive wear, nicks, or breakage. Replace if damaged.
12 Inspect frame/stator (11) for broken or cracked flange, stripped threads, visible damage, shorted windings
and evidence of overheating. If frame/stator is beyond repair, replace motor.
13 Inspect rotor/shaft (17) for evidence of overheating. Replace rotor/shaft if overheating is evident.
14 Inspect rotor/shaft (17) for nicks, gouges, and deformation. Dress high metal defects in shaft with a fine file or
stone. If shaft is beyond repair, replace rotor/shaft.
15 Coat shaft surfaces of rotor/shaft (17) with oil.
5-25
