There have been a lot of threads on this topic (see anything resembling "the tray in my Marantz player using a CDM-4 won't work"). Marantz used a poor material for the tray drive gears in these players, and almost all of them have failed by now, and those that haven't will soon.
Replacements are available on eBay here.
Replacements are available on eBay here.
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