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TM 9-4120-389-14
a.
Inspection
(1)
Inspect motor bracket for damage. Replace if damaged.
(2)
Inspect chassis for damage. Replace if damaged.
(3)
Check motor B-3 for rotational freedom by spinning shaft.
(4)
Evidence of stiffness or binding indicates bearing failure. Replace motor with failed bearing.
(5)
Grasp motor B-3 shaft and move back and forth in direction in line with motor shaft.
(6)
Excessive end play indicates axial failure of bearings, bearing washers and bearing load
spring. Replace motor with excessive end play.
b.
Test
NOTE
This test must be conducted when motor is cool.
(1)
Using an ohmmeter set on lowest ohms scale, check continuity between wire leads El (black
ground wire) and BLUE, WHITE and RED. Continuity must not be indicated between ground and each wire
lead.
(2)
If continuity is found, replace motor B3.
(3)
Using an ohmmeter set on lowest ohms scale, check continuity between wire leads VIOLET
and YELLOW (thermo protector). Continuity must be indicated.
(4)
If continuity is not indicated, is not met, replace motor B3.
(5)
Using an OH meter set on lowest OHMS scale, check continuity between wire leads BLUE,
WHITE, and RED. Continuity must be indicated.
(6)
If continuity is not indicated, replace motor B3.
c.
Removal
(1)
Remove four bolts and flat washers that secure the motor B-3 to the bracket.
(2)
Remove motor B 3.
(3)
Remove four bolts, eight flat washers, four bashings and four locknuts that secure the
bracket to the chassis.
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