patio door rollers

A quick learner from rocky point,ny says:
I hae a Anderson patio door which was installed in 1989 and the door is very hard sliding I have adjusted the ollers at the bottom of the door using screwdriver into plastic roller adjusters doesn't seem to lift door enough
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Paul from SWISCO responded:
Could you have something like the 84-020 screen door roller? Since you already oiled it and adjusted the wheel, it could just be simply broken. It may be time for a new roller assembly.
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