Welcome to the forum. I see no responses to you so far so until someone with specific knowledge of your coach responds, I can only suggest that you need to identify the manufacturer of your slide mechanism and then check on line if you can find any maintenance information on that specific system. With any luck you obtained some systems information when you purchased this coach, but if not, there are some general videos on UTube that show/discuss various slide systems. If you have no info at all, then you will probably have to crawl under the slide and see if you can identify the manufacturer/model specifics etc. While under the slide you may also be able to inspect the slide mechanism for any obvious signs of binding; broken or other obvious failure points. If you find some specific details on the slide, post them and other forum readers may be able to assist you with better more detailed information.
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