TM9-4120-400-14
4-44.
CONDENSER FAN, MOTOR, AND HOUSING - continued
INSPECTION
Check motor rotational freedom by spinning fan. If there is any stiffness or binding, notify supervisor.
1.
Check motor bearings for shaft end play. If there is excessive end play, notify supervisor.
2.
Check impeller fan for dents, bent or loose fan blades, and that hub is securely attached. Replace if damaged.
3.
4.
Check fan inlet ring for dents or any distortion that would cause interference with impeller fan. Replace if
damaged.
TESTING
Use a continuity tester to check continuity of field coils between motor connector P5 pins A and B and
1.
between pins A and C. Continuity should exist.
Check continuity from pin G to pins A, B, C, D, and E. Continuity should not exist.
2.
Check continuity of thermal protectors between pins D and E. If continuity does not exist allow motor to cool
3.
and then recheck. If continuity still does not exist replace motor.
NOTE
If all the above inspections and tests are satisfactory, but the motor will still not operate
properly, notify direct support maintenance, who may desire to make further tests before
it is removed.
REMOVAL
Remove four cap screws (1) and washers (2) from top of motor mounting plate (3).
1.
Cut plastic tie down straps to free motor cable.
2.
Unscrew P4, P5, P6, P8, and P9 connectors and push aside.
3.
Loosen two setscrews (4) on motor shaft extension (5) at motor end. Slide shaft extension (5) and fan (6)
4.
from motor shaft.
Carefully lift motor (7) and mounting plate (3) up and out of unit.
5.
Remove motor shaft extension (5) from fan (6) by loosening setscrew (8) on fan hub.
6.
If motor is to be replaced, remove four cap screws (9), lock washers (10), eight flat washers (11), mounting
7.
plate (3), four bushings (12), and grommets (13).
Use care not to break refrigeration tubing.
Remove three screws (14), lock washers (15), flat washers (16), and loop clamps (17) that secure two charging
8.
valves (18), and pressure relief valve (19), to condenser fan housing (20).
Remove screw (21) and lock washer (22) securing clamp and tubing (23) to fan housing (20).
9.
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