I just replaced the dive/worm gear with the Sear's kit. The gears were worn, but the door opened and closed.
However, now the door will only travel approximately 2 feet in the down position. I have tried everything the mauual said about adjustment. Nothing seems to work.
I have tried to manually adjust up/down sensors to match the other door. However, when I activate the door the drive shaft only moves a short distance before reversing itself and shutting off. In other words it does not stay on long enought to close the door. It reverses itself before the sensor can reach the down sensor on the "limit switch" assembly.