TM 9-4120-404-14
NOTE
Motor must be cool when tested.
(1) Using an ohmmeter set on lowest ohms scale, check continuity between leads 1 (blue) & 2 (red), 1 (blue) &
3 (white), and 2 (red) & 3 (white) on connector P5 or P12, depending on which motor you are testing. Continuity should
be indicated between these leads.
(2) Test continuity between leads 1 (blue) & 4 (black), 2 (red) & 4 (black), and 3 (white) & 4 (black) on
connector P5 or P 12, depending on which motor you are testing. Continuity should NOT be indicated between these
leads.
(3) Test for continuity between leads 1 (yellow) & 2 (violet) on connector P7 or P13 depending on which motor
you are testing. Continuity should be indicated.
(4) Rotate motor shaft on each motor and check for smooth and quiet operation of shaft. Shaft should rotate
smoothly and should not make grinding or binding noises.
(5) If either condenser fan motor fails any of the above tests, that motor must be replaced.
(1) Tag and disconnect all wires from condenser fan motor. Disconnect plug from receptacle J15 on EMI filter.
(2) Remove four screws (1), four flat washers (2), four grommets (3), four bushings (4), and twelve flat washers
(5).
(3) Loosen two set screws (6) on shaft extension (7) and remove shaft extension from motor (9).
(4) Loosen set screw (11) on condenser impeller fan (8) holding shaft extension (7) into impeller fan and
remove shaft extension from impeller fan.
(5) Remove condenser fan motor (9) from motor support (10).
(6) Repeat for other condenser fan motor.
c. Installation.
(1) Install shaft extension (7) onto condenser fan motor (9) and loosely tighten set screws (6).
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