TM 9-4120-378-14
installation.
INITIAL SETUP
Test Equipment
Equipment Conditions:
Ohmmeter or continuity tester
Evaporator fan assembly removed (paragraph 4.32)
Inlet louver removed (paragraph 4.18)
Evaporator drain tubing removed (paragraph 4.23)
Remarks
Action
Location/item
Disconnect air conditioner power source
before doing maintenance work on the
electrical system.
Inspect plug for bent pin, loose wires, etc.
Inspect
a. Turn the motor shaft by hand and listen for click-
Testing
ing sounds that indicate bad bearings.
If the shaft cannot be rotated, the bearings may
b.
have seized.
Test the thrust bearings by attempting to push
c.
and pull the motor shaft axially.
If end play is excessive (i.e., can be felt manually
d.
in push-pull), the thrust bearings or shims are
worn beyond limits and should be replaced.
If fails test, notify Direct Support Maintenance
e.
personnel.
f.
Use an ohmmeter or continuity tester to check
gram.
continuity between pins of the electrical connec-
tor (P3).
g. The motor is capable of operating at two speeds;
therefore, there are two sets of field roils.
h. Check to be sure continuity exists between pins
A and B and E and F.
