I have been reading with interest because I had a similar problem. In the trans cases there is a small metal line that runs vertical and takes the oil under pressure from the pump on the bottom up to the piston threw the top cover if I remember correctly. On my tractor that steel line had ruptured causing the arms to be slow and very weak. It sounds very similar to what you have. The bubbling you are hearing is the fluid being pushed back out that line. You will have to remove the top cover to verify, Which it sounds like your going to have to do anyway. Just be sure to get the lift handle rods in the proper position when you go back together. It's been a while since I fixed mine so time may have stole some of my memories! I think I had to take the pump out also to drive the old tube out, maybe you'll get lucky and it will come out the top, If that does happen to be the problem.
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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