I've used the Alliance rotor sideways for years, and have had no trouble with it. I have mine mounted with the 4 mounting legs going sideways into the shaft of the Az rotor, and the lump facing down. I've used it to swing the antennas the full 180 degrees for flipped operation in the past, though now that I'm running Linux / Predict I only use 0-90 (gotta fix that one of these days...). Haven't tried it in a different position; it just seemed to want to mount this way. Was I lucky?
Pictures at: http://home.jps.net/~gregd/hamsite.htm
I'm mounting an old Alliance U-110 rotator horizontally to use as an elevation rotator, and I have noticed that if it is sitting with the mast clamp on the top everything works very well. If it's flipped with the mast clamps on the bottom (so it can connect to the azimuth mast) it seem stall and jam.
I'm not sure if this is normal or just a sign of age but I traced the problem to a small gear under the shaft that "drops" when the rotator is in the clamp-bottom position and then slips over the top of the gear it is supposed to drive.
Since many people have used this rotator for elevation in the past, has anyone run into this problem before? If so, did you find a solution for it?
--------------------------------- N1DID formerly W0EEC - CM87tm
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