Hi, Welcome to JustAnswer.com, I am glad you are here! My name is Eric & I will endeavor to answer your question.
Something (Obviously) is binding someplace. I need you to do a thorough inspection of every part in the track system. Have someone press the button to open the door as you are looking closely at the track. Look at the tracks to see if you can see them tightly bending... Check to make sure that the rollers are staying in their sleeves and make sure that every screw and bolt in the track system is tight.
I checked track and bindings. Everything seems to be tight. I will verify. My guess is the the center that connects chain pulley is binding somehow. The rollers seems to be fine in each track. It moves up to about 1 or 2 feet off ground and then stops every time.
I appreciate your thoughts. Do you think it would help to lubricate chain and pulley? If so, what oil should I use?
Lubricating the chain and rollers certainly couldn't hurt. What you need to use is this or something like it. http://www.ascycles.com/detail.aspx?ID=43206
What does the motor sound like when it stops?
Please tell me the model number. It should start with a 139
model number is XXXXX
I will look into lubricant mentioned.
When garage door stops, motor does not make any additional noise.
I did notice that center bracket (with chain and pulley) that connects garage door opener to garage door seems to bend ever so slightly where it is getting stuck.