Andrew ES45T manual Preventive Maintenance

Preservation of

Component Parts

Aluminum Parts

Galvanized

Surfaces

Lubrication

When preserving component parts, refer to the following paragraphs in this section.

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 horn window. Edges of existing paint can be blended with a metal surface by using a fine grit sandpaper. Wipe the surface to be painted with a soft rag dampened in trichlorethylene, lacquer 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 dissolve 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 diffi- cult to remove the residue. Allow the cleaned surfaces to dry thoroughly before priming.

Prime the cleaned surface by applying zinc chromate primer. The primer can be applied with 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.

Paint all RF surfaces, such as the inside of the main reflector and subreflector with a high-reflectance white paint. This type of paint disperses light rays, reducing the focus- ing effect of the sun’s radiation, thereby reducing heat build-up caused by the focused sun’s rays on the feed system. Rear surfaces of the reflector and subreflector may be painted with a flat white enamel paint. The paint can be applied with a brush, roller or pressurized spray. If necessary, thin the paint with the appropriate thinner to the proper consistency. Thoroughly pain over the primed surfaces and blend with the existing paint- ed surfaces.

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 sand- paper. 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 dissolve paint if applied heavily and rubbed vigorously. Do not use bleach, soap solu- tions or kerosene as it is difficult to remove these products’ residue. Allow the clean sur- face to dry thoroughly before painting.

Paint the cleaned surface with a zinc-rich paint. The paint can be applied with a brush, roller or pressurized spray. If necessary, thin the paint with the appropriate thinner to the proper consistency.

Thoroughly paint over the cleaned surface and blend with the existing painted surface.

For long life and trouble-free operation be certain no to extend the lubrication schedule beyond the frequency recommended in Table 1. The frequency should be shortened if the antenna is subjected to an adverse environment (e.g. high temperature, extended periods of rainfall, high humidity, dust storms, etc.). Any component or part should be immediately be lubricated if, during inspection or operation, rough, jarring or intermittent motion is noted, or if squeaky or other unusual noises are heard. Lubrication is required on all metal-to-metal rolling or sliding parts. Use the lubricants recommended. Do not over lubricate. Over-lubrication can often be as damaging as under-lubrication. Prior to

79 Preventive Maintenance