Craftsman Garage opener trouble
1/2 hp 1998 model. Recently replaced drive/worm gear. Door sometimes goes up and down fine, so I know the limits are set O.K. Sometimes it will stop going in either direction at different heights. Have tried turning up force controls but still have problems. Sectional Door spring seems to work fine (door easy to open manually). I noticed 5 blinks on indicator light. Should mention I had this problem before I replaced gears. Trolley used to always hit bolt close to opener (set that way by install guys years ago) but I have adjusted it to stay 3 inchs from hitting it.
Opener seems to vibrate alot when opening door but problem still seems to exist, although less frequently, when operating opener without weight of door.
Thanks in advance