Garage door opener problem
I recently replaced the center shaft/main gear and sprocket on my Sears 1/2 hp opener. Now it will not complete one cycle when I push the button. I have adjusted up/down force and up/down travel to no avail. The trolly only travels 4-5 inches, stops and reverses itself. It was working properly before I madde the repairs. Please help as I cannot afford a new opener.