sticking sliding door

A quick learner from kitchen says:
my sliding glass door does not slide open and shut easily. I took the wheels off and cleaned them , but still feels like it is not sliding smoothly. what is causing this ?
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Bob from SWISCO responded:

Did the rollers appear damaged or worn? If so, they may need to be replaced. Also check the track to make sure it isn't worn down or in need of replacement. If so, you may need to replace the track or at least use a track cover. See our 80-106 or 80-102. Watch the videos cited on this page and see if you think these parts might work for you. 

How to identify patio door rollers
How to identify patio door rollers
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How to Replace a Patio Sliding Glass Door Roller [1080p]
How to Replace a Patio Sliding Glass Door Roller [1080p]
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How to Replace a Sliding Glass Door Track
How to Replace a Sliding Glass Door Track
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How to install a sliding glass door track cover
How to install a sliding glass door track cover
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How to replace the pre-701 and 701 Pella patio door roller
How to replace the pre-701 and 701 Pella patio door roller
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How to maintain a sliding glass door
How to maintain a sliding glass door
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How to replace a sliding glass door roller
How to replace a sliding glass door roller
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Identifying the right replacement roller for your sliding glass door
Identifying the right replacement roller for your sliding glass door
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