Every Bobcat I have seen has the lift cylinders with the ports on the top. If they are hitting, it has to be worn bushings, or something assembled wrong.
That said, you can repair them without removing them from the machine. The easiest thing to do is put the bucket down, break both lines loose, and the lift the bucket all the way up with another machine, catching the oil coming out of the cylinder as you do so. You only need the lines loose on one side as they tee together in the back so both sides are tied together. Once you pick the bucket up, lower it down again to insure all of the oil is out of both ends of the cylinder.
With the cylinders now 'dry' you can clean the area with brake clean, etc, and grind the weld out just a touch. Then heat the area with a torch to draw/burn all of the oil out of the crack. Once it is clean and dry, reweld the joint, insuring the weld laps the ends of the crack onto good metal.
The main thing is to keep the cylinder positioned so the piston seal is as far from the weld area as possible.
While I haven't specifically done a Bobcat cylinder this way, I have repaired quite a few others with the same design this way over the years. Once in a while you'll find you left a pinhole, but with proper preparation and cleaning, the other 99.9999% of the time you get a permanent repair, with no leaks.
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