7 ' double paned vinyl slider

A home owner from Groveland CA says:
Viking Slider, purchased through Home Depot
Our slider is not moving smoothly and is hard to open. Do we need a part or an adjustment of some kind.

Also, similar problems as the previous post regarding double hung windows. Please send video mentioned.
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Tom from SWISCO responded:
I'm not sure which video it is you're referring to. I'm also not sure what problem it is you're having. There are a lot of different possible explanations for the problem you're having. You could start by lubricating the tracks and seeing if that helps. If not, then you may need to replace the rollers entirely.
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