TM 11-4940-480-14
CHAPTER 4
MAINTENANCE
CAUTION
4-1. Scope of Maintenance
Do not apply undue pressure on the face (glass
a. General. Refer to technical literature listed in ap-
of the meters and indicators when cleaning, or
damage may occur.
equipments. In addition to the periodic maintenance
procedures described in the equipment manuals, per-
c. To clean the glass faces of the meters and in-
form the procedures given in b and c below.
dicators, use a soft, clean cloth. If needed, dampen the
cloth with water or use a mild soap to make cleaning
b. Daily Preventive Maintenance.
more effective.
tion of the shelter, equipment, and spare parts.
4-3. Touchup Painting
(2) Remove dirt, dust, grease, and moisture from
a. When the finish on the exterior of the equipment
storage cabinets, workbench, and power facilities (para
has been scarred or damaged, rust or corrosion may be
prevented by touching up the surfaces as outlined
(3) Remove rust, corrosion, fungus, dirt, and
below.
moisture from the power entrance panel and antenna
(1) Use No. 000 sandpaper to clean the surface
entrance panel.
down to the bare metal and obtain a bright smooth
(4) Inspect the ground rod and ground strap con-
finish.
nections for good contact.
(2) Sand the area back to solid paint and feather
(5) Inspect the power cable for kinks, strains,
the paint edge that leads to the exposed metal.
moisture, fungus, loose connections, and for frayed,
(3) Wipe the area clean and apply to metal surfaces
cut, o r damaged insulation. Tape any insulation
on coat of zinc chromate metal primer (NSN 8010-00-
damage.
835-21 14), and two thin finish coats of enamel.
(6) Tighten loose mounting hardware.
b. Apply touchup paint with a small brush. For pro-
(7) Check power applied to the shelter (para 3-4).
per care of brushes and painting equipment, refer to TB
c. Weekly Preventive Maintenance. Paint scarred or
43-0118.
damaged metal finishes (para 4-3).
4-4. Troubleshooting and Repair
4-2.
Cleaning
Troubleshooting and repair of the shelter and
a. Remove dust and loose dirt from the exterior sur-
equipments in the shelter is determined by the directions
faces with a clean soft cloth.
in the maintenance allocation chart (app D). The shelter
power distribution function is described in paragraph
b. To remove grease, fungus, and ground-in dirt
from the equipment, use a cloth dampened (not wet)
Repair of malfunctioning equipments in the shelter can
with trichlorotrifluoroethan.
be accomplished by referring to their related technical
WARNING
manuals listed in appendix A.
Adequate ventilation should be provided while
4-5. Shelter Power Distribution (fig. FO-1)
using TRICHLOROTRIFLUOROETHANE.
Prolonged breathing of vapor should be avoid-
The trailer-mounted PU-619/M power generator pro-
ed. The solvent should not be used near heat or
vides 208/120 vat, 3-phase power through a 4-conduc-
open flame; the products of decomposition are
tor cable and connector to the shelter entrance panel.
toxic and irritating. Since TRICHLOROTRI-
Each of the input power phases is connected through a
F L U O R O E T H A N E dissolves natural oils,
magnetic starter with an overload relay. A 20-ampere,
prolonged contact with skin should be avoid-
3-phase circuit breaker protects the air conditioner. The
ed. When necessary, use gloves which the sol-
remaining shelter power passes through power-line
vent cannot penetrate, If the solvent is taken
filters and then through a 3-phase, 30-ampere circuit
internally, consult a physician immediately.
breaker in the main power distribution box. Nine single-
4-1
