TM
9-4120-388-14
5-5. EVAPORATOR AND CONDENSER FAN MOTOR (B2) REPAIR - Continued.
(5) To replace bearings (lMC):
(a) Match-mark motor frame and bracket (end bell) to ease reassembly.
(b) Remove six screws from bracket (end bell).
(c) Carefully separate bracket (end bell) from motor frame.
(d) Carefully pull rotor with shaft and bearing from the frame with stator.
(e) Note the position and number of flat washer, wavy washer, and bearings as they are removed.
(f) Check wavy washer and flat washer for excessive wear, nicks, or breakage. Replace them if they are
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 se-
curely in grease-proof paper until needed for assembly.
(g) Remove bearings.
(h) Examine rotor, stator, and shafts for nicks, gouges, deformations, and evidence of overheating.
(i) Dress high metal defects in shafts with a fine file or stone. If shaft is beyond repair, replace rotor and
shaft.
(j) Examine motor frame with stator for broken flange, stripped threads, visible damage, shorted wind-
ings (para 4-63), and evidence of overheating. if motor frame with stator is beyond repair, replace
motor.
(k) Coat shaft surfaces with oil (MIL-L-2104, Grade 20) or equal.
(i) install new bearing on shafts.
(m) Coat the bearing cavity of bracket (end bell) with oil (MIL-L-21 04, Grade 20) or equal and insert wavy
washer, fiat washer, and bearings in same location as removed in step (e) above.
(n) insert rotor and shaft, with bearing (rear), and retaining ring in place into frame with stator.
(o) Carefully work bracket (end bail) onto shaft end keeping the match-marks made at time of disassem-
bly in alignment.
(P) Secure bracket (end bell) with six screws Before final tightening, check for freedom of rotation by tum-
ing shaft by hand. There should be no drag or binding. Correct as necessary and tighten screws.
Check again for binding and drag.
(q) Check end-play of shaft-End-play stould be 0.002-0.005 inch (0.51-1.27 mm). if end-play is not
within limits, disassemble motor and add or remove flat washers to adjust. Check again for binding
or drag.
(r) install motor. (See para 4-63.)
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