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and minus direction from the local control/motor drive controller at least once every
three months during antenna down time. Check the mechanical limit switches provided
at the end points stop the antenna and feed movement, and limit travel to prevent struc-
tural interference and damage. Check the mechanical limit switches for corrosion and
water entry and the arm on each feed limit switch for free movement without binding. Be
certain both feed rotation limit switch arms are not distorted and ride centrally on the
actuating cam to open their corresponding limit switch.
• Inspect the azimuth and elevation jackscrew boots for security of attachment at both
ends, for abrasion, tears, cuts, brittleness and other damage that may expose the
jackscrew to the environment (water, dust, etc.). Minor repairs can be made with RTV-
108 silicone rubber sealant.
• Visually inspect the feed window for dirt and the feed, feed supports, feed window,
and reflector for distortion, foreign object damage and environmental deterioration due
to ice and snow, dust, rain, hail, and high winds, etc. which may cause electrical compo-
nent and/or structural deformation.
•
Check the cable attachment to the resolvers and to the LNA or LNB’s and enclosure
mount interface for security, the cable rouging for secure hanger attachment and the
cable insulation for cuts, cracking, abrasion, and other deterioration. Check the LNA or
LNB’s and the resolvers for a secure mechanical attachment. Ensure proper torquing of
polarization drive gear box setscrews and appropriate tensioning of corresponding drive
chain assembly, if applicable.
•
Check (if applicable) that the drain holes in the bottom of the enclosure are not
obstructed and there is no evidence of water accumulation. Check the enclosure doors
for proper closure and that the door seals are intact, not torn, abraided or otherwise
damaged. Check that all other seals are intact and if not, use a coating of RTV-108 (sili-
cone rubber sealant) to seal any exposed electrical fitting, bolt hold, or other possible
water entry to electrical components in order to maintain a weatherproof condition. If the
enclosure is provided with a vent fan, check for free operation of the fan blade. The fan
bearings are permanently lubricated; any binding, abnormal noise or vibration necessi-
tates replacement of he fan assembly. Check and replace the fan filter element if it
appears dirty or obstructed with dust.
• Visually inspect all mechanical parts for freedom of operation with no misalignment,
binding or interference. Check all cabling for sufficient slack to prevent cable strain as
well as adequate restraint to prevent abrasion or chaffing during antenna and feed
movement.
•
Check security of antenna mounting and interconnecting assembly hardware. Be cer-
Preventive Maintenance