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Old 06-15-2011, 05:39 AM   #6
DocData757
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Join Date: Oct 2010
Location: FL
Posts: 322
That's not necessarily true. Mine is hydraulic (of that I am sure because of the large hydraulic leak I had due to a blown cylinder seal) and each slide has two rack and pinion arrangements as well. The 2 gears are linked together by a rod so that they both turn together. I believe that is used to evenly transfer the movement of the slide (due to the cylinder pushing/pulling) to 2 points on the slide. This ensures the slide will move out parallel to the camper side and not get cocked. There is one cylinder per slide and it is attached to one of the rack and pinion rails.

BTW, my hydraulic cylinder are little more than 1" in diameter so the 'large cylinder' does not sound like a hydraulic cylinder.

You can confirm if you are hydraulic by looking for a shiney rod coming out of the frame and attached to the slideout. This is the hydraulic ram the moves in and out of the cylinder.
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