TM 9-4120-357-14
c. Servicing. Apply a coating of light machine oil, (SAE 10 lubricating oil) to the pivots of the blades and swivel the
blades to work oil into pivots. Blot up excess oil with cloth or paper towel.
WARNING
Acetone and methyl-ethyl ketone (MEK) are flammable and their vapors can be explo-
sive. Use in a well ventilated area and take precautions against fire.
d. Repair. Straighten bent grille blades by hand if possible. Replace missing gasket material by scraping out re-
maining material and removing residue with acetone or methyl-ethyl ketone and a stiff brush or wooden scraper. Apply a
coating of adhesive to both mating surfaces. Install new gasket material when adhesive becomes tacky but not sticky.
e. Installation. Position the air discharge grille on the air conditioner. Secure it with 16 screws and washers.
4-19. Air Intake Grilles.
Two air intake grilles are located site-by-site below the air discharge grille. Each intake grille is equipped with a
lever-controlled set of adjustable grilles to assist the fresh air damper in controlling the intake of fresh outside air.
a. Removal Remove 12 screws and washers from the frame of each grille, and remove the grilles.
b. Inspection. Inspect the air intake grilles for bent grille blades or other distortion. Check operation to be sure that
grille operates freely. Inspect gasket material for tears, missing sections or poor adhesion.
c. Servicing. Apply a coating of light machine oil, (SAE 10 lubricating oil) to the pivots of grille blades. Operate the
blades several times to work oil into joints. Blot up excess oil with cloth or paper towel.
CAUTION
Acetone and methyl-ethyl ketone (MEK) are flammable and their vapors can be explo-
sive. Use in a well ventilated area, and take precautions against fire.
d. Repair. Straighten bent grille blades by hand, if possible, replace missing gasket material by scraping out re-
maining material and removing residue with acetone or methyl-ethyl ketone and a stiff brush or wooden scraper. Apply a
coating of adhesive to both mating surfaces. Install new gasket material when adhesive becomes tacky but not sticky.
e. Installation. Position the intake grilles on the air conditioner, and secure with 12 screws and washers through the
frame of each grille.
4-20. Front Access Panel.
The front access panel, located on the lower front of the air conditioner, provides access to the junction box assem-
bly, control panel assembly, high- and low-pressure charging (service) valves, compressor, and other refrigeration com-
ponents. The front access panel is secured by a lip, which fits behind the base panel assembly at the bottom, and by
four panel fastener screws, three along the top edge and one near the center of the panel.
a. Removal. Unscrew four panel fastener screws, three along the top edge and one near the center of the panel.
Remove the panel by pulling the top forward and up.
b. Inspection. Inspect the panel for gouges, dents, or other deformation, and for missing or damaged fasteners,
seal strips, insulation or information plate.
c. Repair. Straighten dents or other deformation, using conventional sheet-metal repair methods. Replace missing
or damaged fasteners. Replace other items as follows:
(1) Replace insulation by straightening tabs of six insulation clips, and pulling off insulation. Using new clips if
necessary, press new insulation onto clips and bend tabs to retain.
4-20