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TM5-4120-377-14
(i) Dress high metal defects in shafts with a fine file or stone. If shaft is damaged beyond repair, replace
rotor and shaft.
(j) Examine motor frame with stator for broken flange, stripped threads, visible damge, shorted
windings (Para 4-63) and evidence of overheating.
If motor frame with stator is damaged beyond
repair, replace motor.
(k) Coat shaft surfaces with oil (MIL-L-2104) or equal.
(l) Install new bearings on shafts.
(m) Coat the bearing cavities of two end bells with oil (MIL-L-2104, Grade 20) or equal.
(n) Install load springs and shims in same location as removed in step (e) above.
(o) Carefully install rotor and shaft (bearing, load spring and shims installed on shaft) in bearing cavity
of bottom end bell.
(p) Install this assembly in stator with frame.
(q) See match-marks and align end belt with frame.
(r) Using screwdriver, secure bottom end bell to frame with four screws and four lock washers.
(s) Carefully work top end bell on shaft (bearing load spring, shims installed on shaft) to fit bearing
cavity of top end bell. Rotate top end bell to align match-marks.
(t) Using screwdriver loosely secure top end bell to frame with four screws and four lock washers.
Rotate shaft by hand. There must be no drag or binding. Correct as necessary and tighten screws.
Recheck for binding and drag.
(u) Check end-play of shaft. End-play should be 0.002-0.005 inches (0,051-0,127mm). If end-play is
not within Iimits, disassemble motor and add or remove shims as needed. Check again for binding or
drag. Correct as needed.
Follow-on procedure: Install motor. (See para 4-63.)
Change 1
5-6.3/(5-6.4 Blank)
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