4.7 Replacing the Elevation Motor
and Belt
The elevation motor is mounted to the inside of the support
frame. Machine screws and washers hold the drive motor in
position to maintain proper tension on the toothed drive belt.
Figure 4-9 shows the arrangement of motor, drive belt, and
antenna pulley.
Replacing the Drive Belt
1. Loosen the four #8-32 Phillips 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
behind the roller and 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.
54-0150
62
TracVision 4 Technical Manual
Figure 4-9
Elevation Drive Mechanism
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