Model 1278K Mobile VSAT Antenna System
17
Operation and Maintenance Manual
SECTION 6 — MAINTENANCE
6.1 GENERAL
The AvL Model 1278K Mobile VSAT is designed such that any wear should never degrade performance
below specifications and essentially no maintenance will ever be required. However, since it is impossible
to ascertain or test for all possible environments, the following check up is recommended each year. If any
problems are observed, refer to the appropriate section.
6.2 ANNUAL INSPECTION
AZIMUTH
•
Check for unusual noise in azimuth bearing and azimuth gearbox, and azimuth motor.
•
Run in azimuth and check for unusual noise in azimuth motor.
•
Check position of azimuth drive cables on capstan at 0°az
•
Check drive cables for damage.
•
Run both az limits and observe cable tracking.
•
Check for excessive backlash in gearbox.
•
Inspect cable terminations.
•
Inspect az potentiometer
.
ELEVATION
•
Hand crank in elevation - the unit should hand crank easily.
•
Unit should hand crank with approximately 50-75 in-lbs. torque.
•
Check for unusual noise in elevation pivot bearings and elevation gearbox.
•
Run in elevation and check for unusual noise in elevation motor. (Run to limits)
•
Check position and tracking of elevation drive cables.
•
Check drive cables for damage.
•
Check oil level in gearbox.
•
Remove backing structure covers and inspect cable terminations. Tighten springs if more than
.010 gap exists between spring sets. Tighten with an open-end 7/16” wrench and using Visegrip
pliers holding stud.
•
Inspect elevation limit switches.
POLARIZATION
•
Run in polarization and check for unusual noise in polarization gearing or motor.
•
Inspect polarization potentiometer.
•
Inspect wave-guide for any damage, dents, or cracks.
