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That jack is prone to problems. I've had one for about 2.5 mostly trouble free years (i'd like to replace the hydraulic cylinder), but there have been quite a few recorded failures.
Personally, I called Sears about the problem I had when the jack was about 15 months old (out of warranty after a year) and they basically told me to pound sand.
Check Sears.com owner reviews on that particular jack! Though it looks really nice, it has a TERRIBLE failure rate. I had two of them fail out of the box before I forced them to refund my money.
The 'Professional' model may fair better in real-world use, but it's a new model, so Buyer Beware at Sears.
I took my recalled jack in a few weeks ago and exchanged it for a bigger one. I did not see any 1.5 tons on the shelf, so I asked for the bigger model #50239.