Chapter 4. MAINTENANCE

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

pendix A for maintenance of the shelter and other

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.

(1) Check for completeness and the general condi-

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

4-2).

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

4-5 and may be used as an aid to troubleshooting.

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