#139.53315sr - the trolley squeals even when the door is disconnected - are there wheels in the trolley that can be jammed and will replacing the trolley fix the problem
Sometimes this will solve the problem. Also when lubricating use a good silicone, 3 in 1 makes a good cheap one.
Make sure it is the trolley. I can tell you from many years of experience that alot of the times you think the sound is coming from one place and it is not. Try this to check. Make it so you can raise the door without moving that part. Also run the opener without it moving the door this should help you pin point the problem. If it is that part make sure it is not on too tight. BBMember
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