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TM5-4120-377-14
(j) Dress high metal defects in shafts with a fine file or stone. If shaft is beyond repair, replace rotor
and shaft.
(k) Check bearing retainer for visible damage. Replace it if screw threads are stripped or it is broken
or cracked.
(1) Examine motor frame with stator for broken flange, stripped threads, visible damage, shorted
windings (para 4-63), and evidence of overheating. If motor frame with stator is beyond repair, replace motor.
(m) Coat shaft surfaces with oil (MIL-L-2104, Grade 20) or equal.
(n) Install new bearings on shafts. Be sure that bearing retainer is in place on shaft prior to installing
(rear) bearing.
(o) Coat the bearing cavity of bracket (end bell) with oil (MIL-L-2104, Grade 20) or equal and insert
spacer washers, bearing loading springs, and bearings in same location as removed in step (f) above.
(p) Insert rotor and shaft, with bearing retainer and bearing (rear) in place into frame with
stator.
(q) Carefully work bracket (end bell) onto shaft end keeping the match-marks made at time of
disassembly in alinement.
(r) Aline bearing retainer threaded holes.
(s) Using screwdriver, secure bearing retainer with four screws.
(t) Using screwdriver, secure bracket (end bell) with eight screws. Before final tightening, check for
freedom of rotation by turning shaft by hand. There should be no drag or binding. Correct as necessary and
tighten screws. Check again for binding and drag.
(u) Check end-play of shaft. End-play should be 0.002-0.005 inch (0,051-0.127 mm). If end-play is not
within limits, disassemble motor and add or remove bearing spacer washers to adjust. Check again for binding
or drag.
Follow-on procedure: Install motor. (See para 4-63.)
5-6
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