Sea Tel 9711 C, Installation And Operation Manual

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Maintenance 9711 C & Ku-Band TXRX
16-2
16.2. Torque and Loctite Specifications
WARNING:
Assure that all nut and bolt assemblies are tightened according to the
tightening torque values listed below:
SAE Bolt Size Inch Pounds Metric Bolt Size Kg-cm
1/4-20 75 M6 75.3
5/l6-18 132 M8 150
3/8-16 236 M10 270
1/2-13 517 M12 430
NOTE:
All nuts and bolts should be assembled using the appropriate Loctite thread-
locker product number for the thread size of the hardware.
Loctite # Description
223 Low strength for small fasteners.
242 Medium strength
638 High strength for Motor Shafts & Sprockets.
2760 Permanent strength for up to 1” diameter fasteners.
290 Wicking, High strength for fasteners which are already
assembled.
16.3. General Maintenance
16.3.1. Balancing the Antenna
The antenna and equipment frame are balanced at the factory however, after disassembly for shipping or
maintenance, balance adjustment may be necessary. The elevation and cross-level motors have a brake
mechanism built into them, therefore, power must be ON to release the brakes and DishScan® and
antenna drive must be OFF to balance the antenna. . Do NOT remove any of the drive belts. Balancing
is accomplished by adding or removing balance trim weights at strategic locations to keep the antenna from
falling forward/backward or side to side. The antenna system is not pendulous so 'balanced' is defined as the
antenna remaining at rest when left in any position.
The “Balance Mode” selection located on the upper part of the “Four Quadrant Test” screen in the Tools
– Test menu page. When enabled, Balance Mode temporarily turns DishScan®, Azimuth, Elevation and
Cross-Level drive OFF. This function is required when trying to balance this antenna system.
Assure that Antenna power is ON and that the antenna has completed initialization.
At the Computer (connected to the MXP):
4. Log into the GUI, select Tools - Test in the side bar menus.
5. Select “Balance Mode” (located on the upper part of the “Four Quadrant Test” screen, just
below the page header) to enable balance mode. The screen will then show ON & OFF buttons.
6. Click ON. The screen will temporarily display “Submitting … Please Wait”. When this message
disappears the antenna is in balance mode. DO NOT EXIT THIS SCREEN.
At the Antenna:
7. At the Antenna: Balance the antenna with the elevation near horizon (referred to as front to back
balance) by adding, or subtracting, small counter-weights.
8. Then balance Cross Level axis (referred to as left-right balance) by moving existing counter-
weights from the left to the right or from the right to the left. Always move weight from
one location on the equipment frame to the same location on the opposite side of the equipment