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3. Installing the EQ-2M
Motor
The EQ-2M Motor Drive System is intended for use with tele-
scopes that utilize the Orion EQ-2 equatorial mount.
1. Many of the parts used for the EQ-2M Motor Drive System
are preinstalled on your EQ-2 mount. The circular gear on
the right end of the R.A. worm gear shaft, the odd-shaped
clutch mechanism, the motor mounting shaft, and the
knurled setscrew just underneath the R.A. worm gear are
all part of the motor drive system (see Figure 4).
2. The motor itself fits onto the motor mounting shaft. Loosen
the motor’s locking T-bolt and slide the cylinder of the motor
housing onto the shaft. Make sure that the small gear on the
motor is just underneath the circular gear on the end of the
R.A. worm gear shaft (see Figure 5).
3. Rotate the motor until the motor gear and the circular
gear mesh. Tighten the locking T-bolt; the end of the T-bolt
should seat into the groove in the motor mounting shaft.
4. Connect the spring (Figure 6) on the motor housing to the
knurled setscrew underneath the R.A. worm gear on the
equatorial mount. Do this by first loosening the setscrew
about five turns. Now, stretch the spring and slide its end
ring over the knurled head of the set screw and onto the
threads. If you are having trouble stretching the spring with
your fingers, try using a pair of pliers around the body of the
spring.
5. Slightly loosen the locking T-bolt and the motor will engage.
When the motor is engaged, never, under any circum-
stances, should you use the R.A. slow-motion control cable!
Disengage the motor to use the R.A. slow-motion cable by
rotating the clutch mechanism on the mount clockwise. The
clutch mechanism pushes the motor down, and separates
the motor gear from the circular gear. Re-engage the motor
by rotating the clutch mechanism counter-clockwise; the
spring will then pull the motor back up, which causes the
motor gear and the circular gear to mesh properly once
again. If the spring does not pull the motor up so that the
gears mesh, the locking T-bolt is probably too tight.
The motor is now properly installed on the EQ-2 mount, and
should appear as in Figure 6.
4. Operation
Insert four D-cell batteries into the battery pack. Orient the
batteries as indicated on the white plastic battery holder.
Connect the end of the battery pack’s power cord to the DC
power input on the hand controller. Connect the hand control-
ler plug into the input jack (Figure 2) on the motor.
For the motor drive system to work properly, the equatorial
mount must be polar-aligned. This involves aligning the R.A.
axis of the mount so it is parallel to the Earth’s axis of rotation
Figure 3. The EQ-1M motor properly installed on the EQ-1 mount.
Figure 4. Orion EQ-2 mount comes with many parts of the EQ-2M
Motor Drive System preinstalled.
Circular gear
Knurled
setscrew
Clutch
mechanism
Motor
mounting
shaft
Figure 5. Attaching the EQ-2M motor to the EQ-2 mount. Make sure
the motor gear is positioned directly underneath the circular gear.
Motor gear
Figure 6. The EQ-2M motor properly installed on the EQ-2 mount.
Spring
(1 pages)
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