Technical data

Preventive Maintenance

• Check all electrical components for dirt, cracks, chips, breaks, discoloration and

other signs of deterioration and damage. A discolored, blistered or burnt condition

is evidence of overload.

• Operate the azimuth and elevation drives as well as the feed rotation in both the

plus 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 antenna and feed movement, and limit travel to

prevent structural 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 limits 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 component and/or structural deformation.

• Check the cable attachment to the resolvers and to the LNA or LNBs and enclo

sure 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 LNBs 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, abraded or

otherwise damaged. Check that all other seals are intact and if not, use a coating

of RTV-108 (silicone rubber sealant) to seal any exposed electrical ﬁtting, bolt hole,

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 necessitates replacement of the fan assembly.

Check and replace the fan ﬁlter element if it appears dirty or obstructed with dust.

• Check for the appearance of surface lubricants that will cause the accumulation of

dirt and grime. Clean off all excess surface lubricants with a cloth and, if required,

a cloth dampened (not wetted) with trichlorethylene, or equal.

• 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.