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Appendix C. Gear Switch Meshing Adjustment
One may adjust a HEM44 DEC gear meshing, although it may not be necessary in most of the
cases. If you experienced DEC motor stall occasionally, or there is a small 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 for gear meshing. It has a tuning knob,
body, threaded spring plunger, positioning spring and ball bearing.
Knob
Knob
Hole for
spring &
ball bearing
Spring & ball
bearing
Spring plunger (3mm
Wrench)
Locking screw (2mm
Wrench)
Spring plunger
ball
2. Spring plunger position related to meshing result
Not touched. There will be free play
Just touched. Minimum meshing force. No free play
Engaged position. Normal operation position
Plunger adjusted too much. Ball had been pushed
all the way in and no spring loading power
Disengaged position
2
1
3
4
0
The gear switch should be adjusted to a position that between 2 and 4.
