TM9-4120-400-14
EVAPORATOR FAN MOTOR REPAIR. - continued
5-7.
(4) See wiring diagram figure 4-4 and tags and solder leads to new connector (1). Remove tags.
(5) Secure cable clamp (2).
b. To replace overload (thermal) protectors:
(1) Remove two screws (3) from overload protector (4).
(2) Tag and disconnect leads to overload protector (4).
(3) Remove old overload protector (4).
(4) See tags and connect leads to new overload protector (4). Remove tags.
(5) Install overload protector (4) with two screws (3).
c. To replace bearings:
(1) Match-mark stator (5) and both end bells (6 and 7) to ease reassembly.
(2) Remove four thru bolts (8), lock washers (9), and square nuts (10) from front motor.
(3) Carefully separate end bells (6 and 7) from stator (5) being careful to avoid damaging wires. Tap
opposite sides, top and bottom in alternating sequence to break end bells loose. Wires may be left in
place if care is taken to avoid damaging them.
(4) Press out or carefully drive bearings (11) out of end bells (6 and 7). Remove and retain spacers (12)
and spring washers (13) from end bells (6 and 7) for use at reassembly if they are not damaged.
(5) Examine rotor (14), stator (5) 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(11) on shaft ends. They should seat
against shoulders at the inner ends of shaft.
(7) Coat spacers (12) and spring washers (13) with oil and slide them over end of both shafts with spring
washers (13) installed first.
(8) Coat bearing cavity of each end bell (6 and 7) with oil. Slide end bells carefully into position over shaft
so that OD of bearing enters ID of bearing cavity in end bell. Work end bells onto shaft until bore fits
over end of stator (5). Keep match-marks made at time of disassembly in alignment.
(9) Place four lock washers (9) on each thru bolt (8) and insert thru bolts through both end bells. Place
square nuts (10) on each thru bolt and tighten finger tight.
(10) Tap around both end bells (6 and 7) while tightening screws. Tighten in alternating sequence until all
screws (8) 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.
5-14
