I just bought a house that has a disconnected Sears Craftsman model 139.186006 garage door opener. The previous owner had removed the arm sections and lost them. I have since replaced them but I don't have the manual and the door won't open or close. When I click the remote to open the inner trolley will move about 10 inches back and forth. I have used the increase travel adjustments for closing and opening on the side but the trolley does not change position unless I click the remote several times and then it goes ahead about 1 inch each time and eventually winds up near the motor. Now it will not move the opposite way. I have tried adjusting the up and down force but nothing works. Does anyone though how to adjust this opener? Thanks for your help.