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TM5-4120-377-14
a. Authorized repairs. Direct support maintenance repair of the fan motor is limited to the replacement
of electrical connector, bearings, rotor with shaft, and hardware items.
b. Disassembly. Disassemble motor only as necessary to do required repair.
(1) To replace connector (J12):
(a) Using screwdriver, remove four screws and four lock washers from connector.
(b) Pull connector away from terminal box as far as wire will allow.
(c) Tag and unsolder leads.
(d) Remove connector.
(e) See wiring diagram and tags. Solder leads to new connector.
(f) Remove tags.
(g) Using screwdriver, secure connector to terminal box with four screws and four lock washers.
(2) To replace bearings:
(a) Match-mark frame and two end bells for ease of reassembly.
(b) Using screwdriver, remove eight screws and eight lock washers from two end bells.
(c) Carefully separate two end bells from motor frame.
(d) Carefully pull rotor with shaft and bearings from frame.
(e) Note position and number of load springs and shims.
(f) Check shims and load springs for excessive wear, nicks, or breakage.
Replace if damaged.
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 assembly.
(g) Remove bearings.
(h) Examine rotor, stator, and shafts for nicks, gauges, deformation and evidence of overheating.
5-6.2
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