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Don't take this the wrong way, but there's no tactful way to say this, Phil. I think you kinda screwed up. While it is necessary to pull the lift cover off for many hydraulic repairs, simple troubleshooting can pinpoint the problem with only minor disassembly. Typically, the inspection cover on the right side of the tractor is removed so that the pump, linkage, ram and other parts can be observed while the engine is running and the lift is operating. With the cover off, you're going to be essentially guessing. Most of the time, a lift that is stuck in the up position either has a stuck exhaust valve in the pump or some serious linkage adjustment issues. It's going to be tough to tell you exactly what to look for without knowing what model tractor you are working on. The 9N/2N, 8N, and NAA all had similar ram and rocker designs but each had a totally different linkage and pump setup. You'll have to give us a little more info before we can be of much help.
That said, the answer to your question is no. The piston free-floats in the bore of the cylinder and just pushes on the piston. Gravity pulls sown on the lift arms and the linkage and then forces the piston back down the bore when the touch control lever is pushed down and the exhaust valve in the pump opens.
As far as reassembly goes, it's no picnic to back back together, but it's not extremely difficult either. It's a whole lot easier to do with 2 people. Best way I've seen is to cut the heads off of four 7/16" bolts and thread then into the housing to use as alingment pins. Lower the cover down over the pins while an assistant lines up and engages the linkage. The exact procedure varies a bit between the models.
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