TM 9-4120-360-14
5.102. Installation
Place the body of the heater thermostat in the mounting hole of the heater assembly support, and secure with two screws
and self-locking nuts. Continue the installation as follows:
NOTE
If two heating elements were removed for convenience, replace them at this time.
b. Place the top panel on the air conditioner, and secure with 15 screws and packing washers in the top surface,
and five screws through the rear flange.
c. Fit the fabric cover over the back of the air conditioner, and secure all four sides with 18 screws and washers.
Section XX. EVAPORATOR FAN
5.103. Description
The evaporator fan is located behind the evaporator intake grille and the air filter. The fan is driven by a double-shafted
two-speed motor, and consists of a centrifugal impeller and an inlet ring. Airflow from the evaporator fan is directed
upward into the space behind the heating elements and evaporator coil, and is discharged through those components
before passing out through the evaporator discharge grille.
5.104. Removal
Remove the evaporator fan from the air conditioner in accordance with the following instructions. (See figure 5-11).
a. Remove the evaporator air intake grille by turning six cam-lock studs counter-clockwise to unlock, and
remove the grille.
b. Remove the air falter by unscrewing two screws from the retaining strip on the right-hand side of the filter.
Pull the right-hand side of the falter outward to the right to release it from the left-hand retaining channel.
c. Remove eight screws from the circumference of the inlet ring, and remove the inlet ring.
d. Loosen the two setscrews at right angles to each other in the hub of the impeller. Pull the impeller from the
motor shaft impossible. If the impeller cannot be pulled from the shaft, thread two 5/16-18 screws into threaded holes in
the face of the hub to act as jackscrews. Tighten both in equal increments until impeller is free.
5.105. Inspection
Inspect the inlet ring for nicks, dents, gouges, deformation or evidence of rubbing. Replace the inlet ring if damaged.
Inspect the impeller for gouges, deformation, evidence of rubbing, or broken welds. Replace the impeller if damaged, or
if repair would unbalance its rotation.
5.106. Installation
Install the evaporator fan as directed in the following steps:
CAUTION
Do not hammer the impeller onto the motor shaft. The motor bearings would be damaged. In case of
difficulty, dress out rough spots on the shaft with a fine file, stone or abrasive cloth. Apply a coating of
light oil to ease assembly.
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a. Place key in the shaft keyway, and install the impeller on the shaft. The end of the shaft should be even with
the face of the hub.Tighten the setscrews over the key first, finger tight, then tighten the remaining setscrew. Tighten both
setscrews to a final torque of 78-82 pound-inches (898-945 gram-meters).
