Hi I have a sears craftsman gdo 1/2 hp and about a week ago I replaced the gear because it was worn out but when I put everything back together the door only travels about 6 to 10 inches and reverses. Ive checked the springs there fine, Ive checked the sensors there both well lit, Ive also checked the kg down and up. I dont know what else to do, the light doesnt flash or anything the only light flashing is the little green one in the back next to the button that you program the remote. It flashes 5 times . Even trying to override the sensors by holding down the wall button wont work. Can anyone help?!