The trolley on my screw drive opener is broken. Is it difficult to install a new one?
Depends. If the motor box is mounted on straps or can be shifted around some, you can unfasten the door end of the track from the header and drop it down or to the side to slip out the old trolley and put in a new one. Disconnect the trolley from the door and the screw first, of course, and loosen any wires that go from the track to the door header. Have the new trolley at hand when you take the track loose from the header. If you can see that it is not possible to twist the motor box around, you will have to take the whole assembly down, or at least loosen it and hang it from something, Nuisance job, but not really difficult. It would be nice to have a helper. Some tracks are assembled in three sections, but trying to undo one of those joints with the unit in place is difficult at best; not recommended.
