Appendix B: Care And Maintenance - Celestron CGX Manuel D'instructions

Appendix B:
Care and Maintenance
The CGX mount is sturdy and will last many years when
properly cared for
Storage
Although the mount and electronics are designed for
outdoor usage, you should not store the mount outside
unless it's sheltered by an observatory or storage shelter
of some kind (such as a garage) Constant hot, cold, and
humidity extremes can eventually cause wear to the elec-
tronics, mechanical lubrication and the finish quality of the
mount Store in a sheltered area away from the Sun Keep
in a dry place if possible
Worm Gear Mesh Adjustment
The worm gears in the CGX are spring loaded for optimum
mesh against the worm wheel This also accommodates
temperature changes However, if you find the backlash
has increased or is otherwise not optimal, you can make an
adjustment to the gear mesh Do not attempt to make this
adjustment until you have confirmed the backlash warrants
it Do not overtighten the worm gear mesh, as binding
could result
1 Using a Phillips head screwdriver, remove the gear cover
for the axis you intend to adjust (Figure 12)
2 Test the mesh by grabbing hold of the motor and worm
block with your hand and pulling it away from the worm
wheel The worm block should recoil slightly, causing the
worm gear to back away from the worm wheel slightly
Figure 12 Removing the gear cover
3 Using a 2mm and 2 5mm Allen wrench, make very
slight adjustments as needed to optimize the gear
mesh (Figure X2)
• If the worm block does not recoil, the mesh is too tight,
or the limit screw is pushing the block against the
worm wheel
- Turn the Range Limit Screw clockwise and
check for recoil
- Turn the Distance Adjustment Screw clockwise
and check for recoil
• If the worm block recoils but there is noticeable backlash
when the axis is locked
- Turn the Distance Adjustment Screw counter-
clockwise very slightly, only 1/16th of a turn or
less and retest
- Tighten the Range Limit Screw slightly if the
recoil exceeds approximately 1mm
Worm Gear Block
Worm
Gear
Worm
Wheel
Motor
Distance
Adjustment
Screw
Range
Limit Screw
Figure 13 Worm gear mesh
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