TM9-4120-400-14
5-7.
(1) Remove four screws (3) from overload protector housing (4).
(2) Remove overload protector housing (4).
(3) Tag and disconnect leads to overload protector (5).
(4) Remove old overload protector (5) and spring (6).
(5) See tags and connect leads to new overload protector (5). Remove tags.
(6) Install overload protector (5) and spring (6).
(7) Install overload protector housing (4) with four screws (3).
c. To replace bearings:
(1) Match-mark stator (7) and both front and rear brackets (8 and 9) to ease reassembly.
(2) Remove four screws (10) each from front bracket (8) and rear bracket (9).
(3) Carefully separate end brackets (8 and 9) from stator (7). Tap opposite sides, top and bottom in
alternating sequence to break end brackets loose.
(4) Press out or carefully drive bearings (11) out of end brackets. Remove and retain shims (12) and load
spring (13) from rear bracket (9) (shaft end) for use at reassembly if they are not damaged.
(5) Examine rotor (14), stator (7) and shafts for nicks, gouges, deformations and evidence of overheating.
Replace motor if defective.
(6) Coat shaft surfaces of rotor (14) with oil and slide bearings on shaft ends. They should seat against
shoulders at the inner ends of shaft.
(7) Coat shims (12) and load spring (13) with oil and slide them over end of rear shaft with load spring (13)
installed last.
(8) Coat bearing cavity of each end bracket (8 and 9) with oil. Slide end brackets carefully into position
over shaft so that OD of bearing enters ID of bearing cavity in end- bracket. Work end-brackets onto
shaft until bore fits over end of stator (7). Keep match-marks made at time of disassembly in alignment.
(9) Place four screws (10) in each end bracket (8 and 9).
(10) Tap around both end brackets (8 and 9) while tightening screws (10). Tighten in alternating
sequence until all screws are equally tightened. Check for freedom of rotation by turning motor shaft
by hand. There should be no drag or binding,
(11) 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 shims to adjust.
5-16