We have a AW-3R Christie deck where the middle platter keeps jumping "on top" of the motor so that you can not turn the platter without scraping the top of the motor. It has happened twice that I know of in the past 2 months and to temporarily fix it you just pull out the motor a bit so it goes back to normal. I believe it has only happened after print moves with makes me think it is happening because someone is putting too much pressure on the oposite site of the platter (from where the motor is) causing the actual platter to tilt upwards where the motor slips underneath. I may be way off...is this a normal problem and can it be fixed easily?

While you're down there looking at the motor belt, is it deformed? Many a bad batch of those are in the field and if it has turned into silly putty, then you need to replace it.

Edited addendum...Michael's post above me could also be a problem. I see this mostly not from moving prints by oneself, but from people who splice on the platter, pushing down hard into a crappy splicer (probably a CIR), thus bending one edge of the platter deck downward. Fortunately, the odds are better that the motor belt was improperly installed or has slid down on the shaft.

Well, thanks Brad for the great discription, it helped me find that funny little looking thingy in 2 seconds flat...HOW CHIPPER!!! I know what a motor drive belt is... Give me NO credit will ya?

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I have had several decks with the sleeve separated and the deck has enough wobble to ride right up onto the motor. I have also seen the drive "wheel" slip down on it's shaft but when that happens, the "wheel" usually shows obvious disintegration or warping. It's top should be flush with the top of the motor shaft. As Brad said, that's an easy fix. But I would lean toward the sleeve or the axle.