I'm new to hydraulic garden tractors. I had a couple Craftsmans in the past and I recently picked up a John Deere 312 in great condition. This was the second lawn cutting and it seems that I either lost hydraulic pressure or fluid. I remember the seller showing me a vinyl sight tube on the rear plate and that fluid hasn't changed. I forgot if that was the hydraulic fluid or the rear end fluid sight tube. Anyway, I was cutting the lawn and doing a little fwd and rev action to get into a tight spot. When I placed it in fwd all the way it was sluggish. Now it will only barely move when I feather it (fwd or rev.) out of neutral. Anything more than that and it doesn't move.