cat 963b can not tighten track

Hello I have a 963b and cannot get the left track to take grease, I removed the release grease cover, and the grease fitting will pump grease easly out so the fitting is working. With the grease release fitting off I drove the loader thinking the cylinder would break free and push grease out and nothing. I marked the cylinder and its just stuck. Again with the fitting closed I put a chain on the bucket and put around the y arm and pulled the track out slowly wile pumping grease until tight about 3/4 inch then tried to hand pump grease more and nothing.... its froze up.. I was told to get a pole and wedge between track and bucket and with fitting open try to push the cylinder back in with the bucket which I thought was a good idea. Its definitely not extended out all the way as the right track is much further out and it tightened fine. anyone herd of this?? I also have another issue i will post in a new thread

cat 963b can not tighten track