Most likely you have single action cylinders. They come basically 3 different ways.. 1. cylinder rod is full size of the bore , so no oil or dead air space above the piston seal...2. rod is somewhat smaller than the bore and there is a breather on the top end and air flows in and out as the cylinder is cycled and 3. as mkirsch indicated, there is no pressure, but that space is used to hold fluid so the reservoir level does not vary so much, in which case there should be a low pressure hose attached to the upper (rod) end.
Long cylinders are notorious for holding air and it takes a while to get it all worked out. One reason is when retracted to ground level, the cylinder is usually not retracted all the way. run the front wheels of the tractor up on something so the cylinders retract all the way and see if that helps.
BTW, the cup things are the pressure seals, the things he gave you are the parts that center it in the bore and prevent metal to metal contact, piston to barrel.
This post was edited by IH fan at 09:02:39 08/21/13.
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