Mine started to make a heck of a noise - thought I was done for.
The idea of looking on youtube went over my head. :S
So I pumped some grease in the top in the zerk. Thought it would take a long time for the grease to work its way down and lube everything. So i just took the caps off the top and shot a liberal amount of 30 wt motor oil down ole squeaky. A little up and down motion and the squeak has been gone for 2 years.
If you do my shade tree method and do not want any oil to show up on your concrete floor, put some kind of pad under the jack pad.