TM 9-4120-357-14
d. Prepare surface for priming and painting, using wet abrasive paper to remove dead paint, and to feather-edge
remaining paint area. Paint as directed in TM 43-0139.
e. Replace insulation as necessary, and reassemble the air conditioner.
6-4. Casing Assembly.
To replace the casing assembly, it is necessary to remove all external panels, grilles and information plates, and all func-
tional components and retaining hardware from the inside of the air conditioner. New insulation must be applied to the
inside of the casing before installation of functional components and external panels and grilles. (See Figure 6-1).
NOTE
It is not necessary to debraze all joints in the refrigeration system in order to dis-
assemble it. When instructions to debraze and remove an item are given in the
following procedure, any joint that will permit convenient disassembly can be de-
brazed.
CAUTION
Cap or plug ends of all refrigeration components and tubing to prevent contami-
nation after disassembly.
a. Information Plates. Drill out rivets in information plates to remove them. Position the information plates in the
equivalent location on the new casing, and secure with blind rivets.
b. Insulation. Insulation cannot be removed from the interior surfaces of the old casing without destroying it;
therefore, new insulation must be applied to the new casing. To apply, brush a coat of adhesive onto the surfaces of
both the insulation and the casing. Let set until the adhesive is tacky but not sticky, then position the insulation in the
casing, and press firmly into place all over.
c. Disassembly. Disassemble components of the unit whose casing is to be replaced, as follows:
NOTE
It is recommended that attaching hardware for each component be collected in a
small cloth or plastic bag, and tied or taped to the component for convenience at
assembly.
Unscrew four panel fastener screws from the front access panel. remove the panel.
d. Discharging the System. Whenever a refrigeration component must be replaced, you must discharge all gas
from the refrigeration system in accordance with paragraph 5-6.
(2) Remove 16 screws and washers from the evaporator discharge grille, and remove the grille. (See Figure
(3) Remove 12 screws and washers from each of the two evaporator intake grilles, and remove the grilles. (See
(4) Remove four screws and washers from the circular CBR cover plate to new casing. Secure with four screws
and washers. (See Figure 1-3).
(5) Unscrew six panel fastener screws from each of the air filter covers, and remove the covers and the air fil-
ters. (See Figure 1-3).
(6) Remove 12 screws and washers from the fresh air intake and baffle. Loosen clamping screw from ball joint
holding connecting rod, and remove fresh air grille assembly. (See Figure 4-6).
(7) Remove six screws from the deflector door hinge support bracket. Remove four screws and washers from
the mounting feet of the lid supports. Remove the deflector door assembly. (See Figure 4-5).
6-2
