Ours makes a sound too. Each of the slides has a "rod" for the lack of a better term. The rod has a threaded end with a nut. The hydraulics work for a second or so before the "stop" is encountered so the slide can begin to move. My guess for this "play" is so the hydraulics do not have to immediately be faced with the full force needed. Sooo.. my guess is that that is the reason for the noise prior to the slide moving. The sound is heard more readily from the bedroom slide because of the placement of the mechanics for the slide.
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