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I need help with two problems that I encountered with the
Losmandy Delran covers for their DSC. First, let me describe the
anomolus behavior. When manually centering on a star using a Telrad
finder, the centered star drifted about 2 deg. after I removed my
grip from the SCT. Also, when shifting a star from one end of the eye
piece field to the other using the dec drive, the star stoped
moving. The scope is accurately balanced.
1. I followed the installation of the DSC and covers with great
care using the eploded view in Losmandy instruction sheet. After the
incidence described above, I took the Losmandy covers off and found
that the rubber O-rings were torn in half.
2. After re-assembling the DSC with covers, I noticed that the
covers moved with rotation (about a degree) about the Dec. axis. The
net result is that the covers moved against the gears and
significantly increased drag. This drag is probably sufficient to
stall the motor drive. The net result is that movement about the Dec
axis is similar to serious back-lash. Close inspection showed that
there was no back-lash in the gears, it just felt that way.
3. Removal of the cover and rotation about the Dec. axis showed
that there is no apparent back lash. Further more there is no
apparent increase in drag.
Any suggestion is greatly appreciated.

So that's what the "O" rings were for...I never installed mine and have not
had a problem, should I install them? As far as your problem I would check
again and make sure all the components are on in the correct order and
tight. I had to send back one of the large gears as it was about .002
undersized and would not fit the shaft.
CS
Jay
PS..I had one small problem with the large gear on the Dec shaft which came
loose that could have 'bound' the shaft, but after a little alignment and a
quick turn of an allen wrench everything was fine.

The o-rings are dust seals. Stretching them across the threads to
slide them on seems to give them a rather short lifespan. My first
one to go lasted about 2 months and I removed the other one while I
was in there. The local hardware stoor didn't have a goot
replacement so I left it without the o-rings for now.

This may help with the cover moving...

There is a sliding ring that the five (or is it six?) pressure pins
go through. On my G11 the placement of it was critical to prevent a
loose or binding cover. Also note that the lockdown screw for that
ring needs to match up with the flat area (I missed that the first
time). Good luck.

From my experience and discussions with Scott L..the o ring is only there to help hold everything on the shaft ntil you screw the clutches on.
It will work with the o ring or without the o ring but it will bind up if broken.I've removed both.

The delrin gear covers seem to be to thick.There is a proceedure for using some shims when assembling so everything fits up toght and the cover is supposed to fit.I did this but could't get the clutches tight after.
My solution was to remove the cover and file or grind about 1/8 inch from the back(flat side)
eveything in this respect now works fine.

good luck....jimmy

From: "Jay Stanley" <jstanley@...>
Reply-To: Losmandy_users@...
To: <Losmandy_users@...>
Subject: Re: [Losmandy_users] Losmandy G-11 DSC delran covers
Date: Mon, 14 Aug 2000 19:58:58 -0500

So that's what the "O" rings were for...I never installed mine and have not
had a problem, should I install them? As far as your problem I would check
again and make sure all the components are on in the correct order and
tight. I had to send back one of the large gears as it was about .002
undersized and would not fit the shaft.
CS
Jay
PS..I had one small problem with the large gear on the Dec shaft which came
loose that could have 'bound' the shaft, but after a little alignment and a
quick turn of an allen wrench everything was fine.





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