With the engine off, and any implements resting fully on the ground, there won't be any pressure on the line.
But if there were, you should get a lot of oil coming out with the nuts loosened, long before the line is completely disconnected. If the line is below the oil level in the reservoir, there may be some gravity drainage. You can either drain the level down, or catch the oil in a container.
No bleeding or priming necessary. Once reconnected and running, cycle any hydraulic accessories through a few times, that will self purge any air. There may be some jumpy, spongy movement at first, but once the air is out, it will return to normal.
The one thing you want to be careful of, for the tractors sake, keep the fittings as clean as possible. If there is potential for dirt to get in the exposed fittings, you can wrap them with plastic bags and tape while working on the starter.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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