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For iOptron Internal Use Only 

 

 

 

 

 

GEM28 Worm Play Identification and Adjustment 

 

Tool needed:

 a set of metric Allen wrench and a 

small flat top screw driver, a pair of nose pliers or 
tweezers. 
 

GEM28 Ring Gear Cover Removal: RA 

The design of GEM28 will need to remove the DEC 
unit from the mount in order to expose the RA ring 
gear compartment. 

1.  The DEC unit is connected to the RA axle via 4 

socket screws. Two is on side the DC unit. One 
is on bottom of the DEC unit. The fourth one is 
inside  the  mount.  Remove  front  polar  scope 
cover and look into the mount, you should see it.  

 

2.  Remove  red  CW  shaft  mounting  adapter  from 

the  bottom.  The  bottom  screw  now  is  easy  to 
access. 

 

 

3.  To  access  the  top  screw,  you  may  use  a  long 

arm  ball  head  wrench  through  the  RA  axis 
opening to release it.  

 

 

 

4.  Pull the DEC unit off from the RA axle. Remove 

three  screws  and  take  off  the  RA  ring  gear 
cover.  

Содержание GEM28

Страница 1: ...nt 1 The DEC unit is connected to the RA axle via 4 socket screws Two is on side the DC unit One is on bottom of the DEC unit The fourth one is inside the mount Remove front polar scope cover and look...

Страница 2: ...and control board to access the top screw 6 Remove mount DEC motor cover 7 Carefully unplug the motor cable from the DEC control board 8 Unscrew the screw post and two screws that hold the plastic ba...

Страница 3: ...xam the worm assembly movement when hold and rotating the ring gear 1 If the whole worm assembly moves up and springs back down this is normal for a spring loaded worm gear system 2 If the whole worm...

Страница 4: ...king screws Make sure they are tightened 7 Release hinge bearing end cap locking screw half turn 8 Turn the brass end cap clockwise all the way in using a pair of strong tweezers or a screw driver Rot...

Страница 5: ...lateral movement is cause by a loose worm bearing end cap It is not accessible without remove the worm assembly from the mount Follow Step 2 to Step 4 to remove motor cover cable control board and mo...

Страница 6: ...ashers as well Pull the worm assembly from top of the ring gear compartment 18 Tap the bearing out of the housing if needed The following is a set of a bearing a washer and a hinge pin The following s...

Страница 7: ...n the shaft and tighten the set screw onto it Make sure that the worm shaft end if aligned flash to the pulley surface 23 Before install the worm assembly insert one hinge bearing into the bearing hou...

Страница 8: ...9 Now install the gear switch back 30 Insert the spring into the gear switch hole Put the ball bearing on top of it Insert gear switch into the worm assembly while align the ball bearing to the slot P...

Страница 9: ...For iOptron Internal Use Only 9 32 Check the play with worm ring gear engaged while rotating the ring gear 33 Follow steps 10 12 to put the motor control board and cover back...

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