Andrew operation and maintenance Specifications download pdf (Page 14)

A-325 Hardware Tensioning Procedure

1. Lubricate bolt threads with stick wax to reduce friction.

Do not allow wax under flat washer.

2. After connections are completed, tighten bolts until sur-

faces are joined and nuts are snug. Do not proceed with

Steps 3 and 4 below unless the connection is final. If bolts

are loosened after Steps 3 and 4, discard and replace with

new hardware. Repeat all steps.

3. Mark nuts and end of bolts with straight line. See Figure

4. Tighten nuts further with extra long wrench or power

wrench until nuts are moved an additional 1/3 turn (120°

±30°). See Figure B.

5. If bolt length exceeds four diameters, further tighten nuts

until they are moved a total of 180°. See Figure C.

3.0 Preservation of Component Parts

3.1 Aluminum Parts

A. Remove all loose paint and corrosion by scraping, wire

brushing or using steel wool. If using steel wool near the

feed window, make sure that none remains on the feed win-

dow. Edges of existing paint can be blended with the metal

surface by using a fine grit sandpaper. Wipe the surface to

be painted with a soft rag dampened in trichlorethylene, lac-

quer thinner or equal. Be certain to remove all loose paint,

corrosion, imbedded dirt, grease and oil deposits or the

paint will not adhere to the surface. Lacquer thinner will dis-

solve paint if applied heavily and rubbed vigorously. The

reflector may be washed with plain water if necessary. Do

not use bleach, soap solutions or kerosene as it is difficult

to remove the residue. Allow the cleaned surface to dry

thoroughly before priming.

B. Prime the cleaned surface by applying zincchromate

primer or equivalent. The primer can be applied with a

brush, roller or pressurized spray. If necessary, thin the

primer with lacquer thinner to the proper consistency.

Feather primer onto adjacent painted surfaces. Allow primer

to thoroughly dry before applying the finish paint coat.

C. Use only a highly diffusive white paint to paint the inside

of the reflector. This type of paint disperses light rays,

reducing the focusing effect of the sun’s radiation, thereby

reducing heat buildup caused by the focused sun’s rays on

the feed system. All other surfaces of the antenna may be

painted with a gloss white enamel paint. The paint can be

applied with a brush, roller or pressurized spray. If neces-

sary, thin the paint with the appropriate thinner to the prop-

er consistency. Thoroughly paint over the primed surfaces

and blend with the existing painted surface.

D. Andrew Type ESPNTK-2 Touch-Up Paint Kit is available

for restoring damaged paint on aluminum surfaces.

3.2 Painted and Galvanized Steel Surfaces

A. Remove all loose paint and corrosion by scraping, wire

brushing or using steel wool. Edges of existing paint can be

blended with the metal surface by using a fine grit sandpa-

per. Wipe the surface to be painted with a soft rag damp-

ened in trichlorethylene, lacquer thinner or equal. Be certain

to remove all loose paint, corrosion, imbedded dirt, grease

and oil deposits orthe paint will not adhere to the surface.

Lacquer thinner will dissolve paint if applied heavily and

rubbed vigorously. Do not use bleach, soap solutions or

kerosene as it is diffcult to remove the residue. Allow the

cleaned surface to dry thoroughly before painting.

B. Galvanized surfaces may be painted with a zinc-rich

paint. The paint can be applied with a brush, roller or pres-

surized spray. If necessary, thin the paint with the appropri-

ate thinner to the proper consistency. Thoroughly paint over

the cleaned surface and blend with the existing painted sur-

face.

C. Painted surfaces of the antenna other than the inside of

the reflector may be painted with a gloss white enamel paint.

The paint can be applied with a brush, roller or pressurized

spray. If necessary, thin the paint with the appropriate thin-

ner to the proper consistency. Thoroughly paint over the

primed surfaces and blend with the existing painted surface.

D. Andrew Touch-Up Paint Kit is available for restoring dam-

aged paint and galvanized surfaces due to corrosion.

E. Proper cleaning of plastic components may be per-

formed in accordance with the following procedure:

3.3 Plastic Parts

Proper cleaning of plastic components may be per-

formed in accordance with the following procedure:

A. Remove all dust and/or dirt from the component surface

using a soft cloth or chamois dampened with a mild deter-

gent or similar household cleaner.

Note: Do not use any abrasive cleansers or strong chemi-

cals to clean the assembly which may cause damage to the

assembly surface.

B. Allow the cleaned surface to thoroughly dry and sparing-

ly apply an automotive type wax to the surface of the

assembly.

C. Lightly polish the surface using a clean, dry rag.

A. Before Tensioning

B. After Tensioning C. After Tensioning

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Andrew operation and maintenance Specifications Page 14

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