Orion 7832 manual Attaching the Dec. Motor Drive

R.A. worm gear shaft

Brass gear of R.A.	Hole
motor assembly

Figure 3. The motor is attached to the front of the mount by a sockethead cap screw pushed up through the hole in the rear of the mount.

This attachment process is tricky, and it may take you sev- eral tries before you get it right.

3.Remove the R.A. slow-motion control knob from the R.A. worm gear shaft if it is on the side of the mount that the motor assembly’s brass gear is on, and attach it to the opposite end of the worm gear shaft.

4.Slide the open end of the manual clutch assembly (Figure

4)onto the worm gear shaft. Rotate the manual clutch

Brass gear

Setscrew

Thumbwheel

Open end

Figure 4. The manual clutch assembly.

assembly so that the setscrew will press against the flat in the R.A. worm gear shaft. Secure the manual clutch assembly by tightening the setscrew with a 2mm hex key.

5.Make certain that the teeth of the motor assembly gear mesh with the teeth of the manual clutch assembly gear. Also, make certain the gears are not too tightly pressed together. You can adjust the way the gears mesh by tight- ening or loosening the socket-head cap screw that is used to attach the R.A. motor assembly to the mount. If the gears are not meshed correctly or are too tightly pressed together, then the drive will not track properly, or at all.

When finished, the assembled R.A. drive should resemble Figure 5.You can now replace the R.A. motor cover and secure it with the Phillips head screw.

Please note that if you wish to use the slow-motion con- trol knob to move the telescope in R.A. with the R.A. motor drive attached, you must first loosen the thumbwheel on

Figure 5. The assembled R.A. motor drive.

the manual clutch assembly. Failure to do so may result in damage to the motor.

Attaching the Dec. Motor Drive

Before attaching the Dec. motor drive, the telescope tube must be removed from the mount.

1.The Dec. motor assembly is identified by its black, cylindri- cal body (Figure 6). It is attached to the equatorial mount with the 5mm socket-head cap screw that goes through the hole in the flange at the top of the equatorial mount (Figure 7). The motor assembly should be attached so that it is oriented as shown in Figure 8. Hold the motor assem- bly so that its threaded hole lines up with the hole in the

Modular jack

Brass gear

Threaded hole

Figure 6. The Dec. motor assembly.

top of the mount. Thread the screw with a 5mm hex key through the mount and into the motor assembly. Thread the screw into the motor assembly until it is secure, but do not overtighten.

2.Remove the Dec. slow-motion control knob if it is on the end of the Dec. worm gear shaft closest to the Dec. motor

2