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5.6.1 Drive Belt Removal and Replacement
1. Loosen (2) #8-32 x 5/8" screws until the motor is
free to move upward. Raise the motor to the top of
the slots and retighten the screws to hold it there.
2. Roll the belt over the motor hub while slowly
moving the antenna reflector through its vertical
travel. Work the belt out from between the antenna
pulley and reflector.
3. Carefully work the new belt in between the
antenna pulley and the reflector. Ensure that the
teeth are on the inside of the belt. Feed the belt
over the motor hub. Once the belt is in place, work
it back and forth to ensure that the belt is aligned
and the teeth are engaged with the motor pulley.
4. Gently press downward on the motor hub until
the drive belt is at proper tension. Adjust the belt
tension for a maximum of
1
⁄
8" (3 mm) deflection
with moderate finger pressure between the motor
and antenna pulley. Some readjustment may be
necessary if the belt tension results in excessive
antenna reflector vibration.
5. Tighten the holding screws.
5.6.2 Elevation Drive Motor Removal
and Replacement
1. Remove the Elevation Motor Molex connector
from the PCB (illustrated in Figure 5-8). Feed the
drive motor cable through the cutout to the front
of the elevation drive assembly support frame.
2. Remove the two machine screws and washers
holding the motor in position. Withdraw the
motor from the elongated slots.
3. Remove (2) screws from the tapped motor
mounting plate and transfer the plate and screws
to the replacement motor. Apply a drop of thread-
locking compound (e.g., Loctite 425 or equivalent)
where each screw protrudes from the plate.
5-9
Maintenance
54-0150 Rev. D