Dome Parts GmbH
Keltenstr. 2
86517 Wehringen,
Germany
phone: +49 8234 90 59 100
web: https://www.astrogfk.com/
e-mail: mail@astrogfk.com
... the observatory people
Maintenance / repair work on the drivers / shutter guide rails
If repairs are required, proceed as follows:
Open the roof. Fix the open shutter to be able to work on it. (Place square timber / board under the
shutter)
Remove the two top screws on the shutter rail
Remove the screw and the then place a piece of wood (head) from the last plank under the guide beam.
Unscrew the visible screws of the log and remove the plank covering the rear wall pcik-up assembly. Do
this under an angle. Now you can access the pick-up mechanism and steel cables.
Pick-up roller assembly:
Remove the steel cable from the roller assembly. Now the roller assembly can be moved freely in the
aluminum rail.
Pulleys:
The pulleys can now be exchanged using an open-end wrench.
Rails:
Remove the screws from the rail and reinsert the new element.
Steel cables:
To do this the steel cables must be separated from the pick-up assembly and then removed from the rail.
When re-installing, pay attention to the cable guide in the shaft. The steel cable must be readjusted after
every change or rpelacement.
Always also check consistency!
After the change, the cover plank has to be screwed on in place again, also so the small head element.
Shutter jitter and locking up:
If the shutter starts to jitter or locks up, you can solve this by adjusting the the guide-rail rollers (left and
right on the shutter. There are three small screws in slotted holes. Loosen these and shift the rollers
outwards. Tighten everything and check if the shutter moves OK now.
Shutter doesn't go up far enough:
There are adjustabel terminals on the lower guide rollers of the shutter, which would then have to be
readjusted (from the inside of the observatory).
Shutter does not move cleanly:
Lubricate the guide rails with a good quality grease. Do not use oil.
Adjust the guide rollers, Check cable tension.
Are there any objects in the way in the mechanics?
Maintenance
