Appendix D. Gear Meshing Adjustment
CEM40 gear is designed adjustable by customer although in most cases not necessary. If you
experienced DEC/RA motor stall occasionally, or there is free play between the worm and gear, follow
this instruction to adjust the gear meshing.
Tool needed: 2mm and 3mm hex keys.
1. Gear Switch
iOptron Gear Switch uses a spring plunger to apply the force on worm assembly to push the
worm against the ring gear for gear meshing. It has a tuning knob, body, threaded spring plunger,
positioning spring and ball bearing.
Hole for spring &
ball bearing
Locking screw
(2mm wrench)
Spring plunger
(3mm wrench)
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