TM 11-5840-360-14-1-1
5.5.1 High Voltage Arc Prevention
5.7 PREVENTIVE MAINTENANCE PROCEDURES
High voltage components within the receiver
WARNING
transmitters and the indicators must be kept clean and
WHEN PERFORMING MAINTENANCE
dust-free to prevent the possibility of HV arcing. Diesel
AT THE ANTENNA, SET THE
soot and dirt should be removed with a mild detergent
ANTENNA SAFETY SWITCH TO OFF.
and water, and all surfaces dried thoroughly.
5.7.1 Antenna Pedestals AB-1247 and AB-1247A
5.5.2 Condensation Prevention
5.7.1.1 Lubrication. - Perform the following steps:
If the equipment is to be inoperative for periods
1. Remove the access cover from the top of the
longer than 24 hours, it should be fully energized for at
antenna pedestal assembly.
least one hour each day. This procedure ensures that
2. Unscrew the oil cap and dipstick. Wipe the
any condensation, particularly in tropical climates, is
dipstick clean.
dried out and vented.
3. Insert the dipstick into the filler hole and
remove.
5.5.3 Inspection (Monthly Intervals)
4. lubricant level is below the line, pour a small
amount of gear box lubricant (MIL-L-6086,
Inspect the exterior of all units for dust and finish
Grade M) into the filler hole. Total capacity is
deterioration. Clean or repair as necessary.
1.11 quarts (1.05 liters).
NOTE:
NOTE
For operation below -150F (-24 )
C
The flare of the antenna unit is
use MIL-L-6086B, Grade L.
covered by a fiberglass window,
which must not be painted. Metal-
based paint will considerably distort
5. Re-check the level.
If necessary, add an
the radiation pattern, and will absorb
additional amount of lubricant, and re-check
again.
part of the radiated energy. The
remaining external surfaces of the
5. .1.2 Drive System Inspection. - Perform the
equipment have been epoxy-paint
following steps:
sprayed, and should require only
1. Disconnect waveguide located underneath the
cleaning in normal use.
pedestal.
2. Remove the screws that secure the hinged
5.5.4 Cleaning (Monthly Intervals)
pedestal top to the fixed bottom plate.
3. Swing the hinged pedestal top into its service
Wash the exterior of the antenna and pedestal
position.
assembly with fresh water. Clean the display face of the
indicator unit with a clean soft cloth slightly dampened
CAUTION
with fresh water.
BE AWARE OF THE ANTENNA
ARRAY POSITION AT ALL TIMES
5.6 PREVENTIVE MAINTENANCE SCHEDULE
WHILE
PERFORMING
THE
FOLLOWING STEPS.
The preventive maintenance activities listed in
mechanical failures and to forewarn the technician of
4. While manually rotating the drive sheave and
impending faults due to performance degradation.
belt (see Figure 5-3), check the belt for any
The table references the paragraph in which the
signs of stretching, deterioration, fraying,
procedural instructions are given and defines the
breaks, cracks, or loss of flexibility.
recommended frequency for performance of the
5. Verify that the belt and the sheave surfaces that
procedures. Activities 1 through 8, 15 and 16 of Table
come in contact with the belt are clean and free
from oil.
through 14 are applicable to AN/SPS-64(V) 4 only.
6. Check for smoothness of rotation (no binding or
roughness); inspect gear box for signs of oil
leaks, and drive motor for evidence of
excessive heating.
5-3
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