Removal and replacement of ADU modules
99-145912-A Chapter 8: Service & maintenance 8-41
To insert a new Azimuth Motor follow the instructions above in reverse
order — while observing the following guidelines:
1. String the Azimuth belt around the pulley of the motor assembly and
around the belt tensioner.
2. Tighten the 4x4 mm Allen screws (thread size M5) from the motor
assembly.
3. Adjust the belt tension using the belt-tension adjustment screw.
The tension of the belt is 90-100 Hz on average (use an Optibel
frequency measuring device or alike).
Figure 8-46: Azimuth motor, tighten the screws for the motor assembly
Figure 8-47: Azimuth motor, adjust belt tension