TM9-4120-370-14
T035E9-229-1
5-4.
EVAPORATOR FAN MOTOR (B3 AND B4) REPAIR - Continued.
(i) Using screwdriver, secure thermostat with two screws and spacer.
(j) Using screwdriver, secure cover with four screws
(3) To replace bearings:
(a) Match-mark motor frame and both end brackets to ease reassembly.
(b) Using screwdriver, remove four screws from each end bracket.
(c) Carefully separate end brackets from motor frame. Use a brass or plastic bar and hammer and tap
end brackets away from motor frame. Tap opposite sides, top, and bottom in alternating sequence
to break end brackets loose.
(d) Remove end brackets.
(e) Press out or carefully drive bearings out of end brackets. Note locations and quantities of bearing
spacer washers and bearing loading springs for use at reassembly if they are not damaged. They
should be replaced if they are broken, nicked, or worn.
(f) Examine rotor, stator, and shafts or nicks, gouges, deformations, and evidence of overheating.
(g) Dress high metal defects in shafts with a fine file or stone. If rotor or stator are beyond repair, replace
motor.
(h) Coat shaft surfaces with oil (MIL-L-2104, Grade 20) or equal
(i) Coat the bearing cavity of each end bell with oil (MIL-L-2104, Grade 20) or equal and insert spacer
washers, bearing loading springs, and bearings in same locations as removed in step (e) above.
(j) Carefully work end brackets onto shaft ends keeping the match-marks made at time of disassembly
in alinement.
(k) Carefully aline mounting holes.
(l) Using screwdriver, secure each end bell with four screws. Before final tightening of screws, check for
freedom of rotation by turning shaft by hand. There should be no drag or binding. Adjust as necessary
and tighten screws. Check again for binding and drag.
(m) 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,
Install motor (See para 460.)
Follow-on procedure:
5-4
