Garage Door Twisted ?

[Alltorque]

My garage door, (Henderson, steel, single up&over, 15+ years old, spring above door not at sides), has started to catch against side of the frame when opening or closing, making it very difficult to open/close. It's catching at bottom left + top right but has gaps at top left + bottom right. Suggestions to adjust etc, please. Ta.

Question also posted on "How Does It Work"

[KARL]

It seems likely that at some stage it has been pushed up enevenly - this can cause one "loop" of the cable (on one side, right or left) that is wound onto the cones on the ends of the spring above the doorway to come off. To solve this the best way is to push it up unevenly again (lifting the droopy side) and winding an additional loop onto the cone. Close the door completely (perhaps needing a up-and-down rigmarole to achieve this, mind the cable is free to unwind) and then reopen, with luck everything will be back to normal. Beware of one thing though: the cable may have come off the cone (now or earlier) and been damaged. To check this close the door completely and inspect both cables - spare cone with cable used to be available (there is a bit of a trick to replacing these - consult instructions and follow carefully). In the worst case, the cable may have snapped, but I think you would not then be able to open the door any more.

[logman]

This happened to mine once, it all started when i got a bit lazy and pulled it down by one corner, which happened to be nearest. I sorted it by giving it a sharp yank the other way (you may need help from a friend here) After that i got in the habbit of pulling it down from the middle..

[Alltorque]

Karl and Logman, thanks for your rapid input............think you've hit the proverbial nail. Gonna be heave-ho'ing tomorrow, methinks. Ta. muchly.