TM 9-4120-360-14
b. Position the inlet ring, flat edge up, into the circular fan opening. Secure with eight screws. Rotate the
impeller by hand to be sure that no rubbing exists. Adjust inlet ring if necessary.
c. Install air falter in left-hand retaining channel, and install retaining strip with two screws.
d. Position evaporator air intake grille on
the air conditioner, and secure by
turning six cam-lock studs
clockwise.
Section XXI. CONDENSER FAN
5.107. Description
The condenser fan is located behind the cirular fan guard on the back of the air conditioner. The fan is driven by one end
of a double-shafted two-speed motor. It consists of an aluminum axial impeller which rotates within a shroud which is
part of the motor support (See figure 5-12). Air is drawn into the lower chamber through the condenser coil, and is
exhausted through the fan guard.
5.108. Removal
Remove the condenser fan from the air conditioner in accordance with the following procedure:
a. Remove eight screws and lock
washers from the rim of
the condenser fan guard, and remove the fan guard.
b. Loosen two setscrews in the hub of the fan impeller, and pull the impeller off the motor shaft.
NOTE
The two 1/4-20 holes in the face of the impeller hub can be used to attach a wheel puller if necessary.
5.109. Inspection
visually inspect the condenser fan impeller for nicks, gouges, cracked welds, missing pieces and deformation. Check
outer ends of blades for evidence of rubbing or scraping. If there is damage sufficient to unbalance the impeller, replace it.
5.110. Installation
Install the condenser fan as directed in the following procedure:
Do not hammer the impeller onto the motor shaft. The motor bearings would be damaged. If difficul-
ty is encountered, dress out rough spots on the shaft with a fine file, stone or abrasive cloth. Apply a
coating of light oil to ease assembly.
a. Align keyways in shaft and impeller, install key, and press impeller onto shaft. The end of the motor shaft
should be even with the face of the hub when the impeller is completely in position. Tighten setscrews finger tight.
Starting with the keyway setscrew, tighten to a fnal torque of 78-82 pound-inches (898-945 gram meters).
NOTE
In order to direct the condenser exhaust upward, away from the intake, the condenser fan guard is designed
.
so that it can be installed in only one way. All screw holes must match to permit proper installation.
b. Position the condenser fan guard properly on
the air conditioner, and secure it
with eight screws and lock
washers.