IOptron CEM26 Bedienungsanleitung

For iOptron Internal Use Only

CEM26/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.

1. After open the RA/DEC ring gear cover to

expose worm assembly and ring gear, exam

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 assembly moves left/right,

or even gets free at one end, the hinge(s)

may get loose. Go to next step to fix it.

(3) If only the worm itself is moving freely, the

worm end cap needs be tightened. Please

refer to Step 13 to adjust it.

2. Remove mount motor cover.

3. Carefully unplug the motor cable from the DEC

control board.

4. Release two screws and remove the motor

5. Check the worm assembly to see if both hinge

pins are in position. They should be almost

flash with the bearing.

Hinge pin

(1)

(2)

(3)

For iOptron Internal Use Only

6. Check two hinge locking 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. Rotate the ring gear to confirm the free

play is eliminated. Then un-tighten the end cap

1/16-1/8 turn. Check the free play again.

9. Tighten the end cap set screw as in Step 7.

Check the play again.

10. Thread the belt over motor pulley and attached

the motor to the worm assembly. Tighten the

screws slightly.

11. Tension the belt while tighten the motor

mounting screws.

12. Reconnect the cable and put the cover back.

13. The worm/worm pulley 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 motor.

14. Set the Gear Switch to locking position.

Carefully remove the gear switch locking pin.

End cap

Locking Pin

For iOptron Internal Use Only

15. SLOWLY Pull the gear switch knob outwards.

Put your palm underneath to collect the little

spring and the ball bearing. The ball bearing is

spring loaded and very easy to be sprung off.

16. Release two set screws on mount assembly:

two for locking assembly hinge pins and one for

hinge bearing end cap.

17. Remove the hinge pin bearing end cap. Use a

small screw driver to push the hinge pins

inward. It will drop off from the center slot.

There are small washers 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 shows the relative position of the

end cap, hinge pin/bearing and a worm

assembly.

Spring underneath

the ball bearing

For iOptron Internal Use Only

19. Release a small set screw on Worm pulley and

remove the worm pulley.

20. Check the worm by pulling-pushing the shaft.

You should see/feel the lateral movement if

there is free play.

21. Release worm end cap set screw a little.

Tighten the brass end cap by using a pair of

nose pliers or a pair of strong tweezers. Back

out the end cap 1/16-1/8 turn. Turn the worm

shaft with fingers. There should be no stiffness.

Check if the lateral free movement is eliminated.

Tighten the set screw. Check the worm

smoothness again. If there is any stiffness

exists, you need to readjust the worm end cap.

Until there is no lateral play, or worm stiffness.

22. Put the worm pulley back on to the worm shaft.

Locate the flat surface on 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 housing without

the locking end cap.

24. Wrap the belt over the worm pulley and insert

the worm assembly back into the ring gear

compartment. You may rotate the mount head

90 degree so the worm pulley and open-ended

hinge pin bearing house is on top.

Hinge bearing

and end cap

Set screw

For iOptron Internal Use Only

25. Insert hinge pins while insert the washer

between the bearing and worm assembly body.

Tap the hinge pin inward to make sure its end

flash with the bearing surface.

26. Lock hinge pin by tightening the locking set

screws.

27. Turn the brass end cap clockwise all the way in

using a pair of strong tweezers or a screw

driver. Then un-tighten the end cap 1/16-1/8

turn. Check the worm assembly that it can

moved freely and no free play.

28. Tighten the hinge end cap set screw. Check the

play again.

29. 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. Push ball into the switch

body while push the gear switch into the worm

assembly. Need be very careful not to spring

away the ball and spring.

31. Turn the gear switch while push it inward to

check if it is smooth. Then insert the gear

switch locking pin and secure it.

Washer goes next

to bearing

Hinge pin end

End cap

Ball bearing

goes in this slot

For iOptron Internal Use Only

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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